Novatel WAAS G-III User manual

USER MANUAL
WAAS G-III Reference
Receiver
OM-20000137 Rev 1

2 WAAS G-III Reference Receiver User Manual Rev 1
Proprietary Notice
WAAS G-III Reference Receiver User Manual
Publication Number: OM-20000137
Revision Level: Rev 1
Revision Date: March 2013
Associated EICD Version: D14799, Rev 1
NOVATEL INC. PROPRIETARY DATA
The information disclosed herein is the exclusive property of NovAtel Inc. and is not to be disclosed without
the written consent of NovAtel Inc. No part of this publication may be reproduced or transmitted in any form or
by any means including electronic storage, reproduction, execution or transmission without the prior written
consent of NovAtel Inc. The recipient of this document by its retention and use agrees to respect the security
status of the information contained herein.
This document is intended for limited circulation.
Limited Rights Notice
These data are submitted with limited rights under Contract No. DTFAWA-09-C-00045. These data may be
reproduced and used by the Federal Aviation Administration (FAA) with the express limitation that they will
not, without written permission of the Contractor, be used for purposes of manufacture nor disclosed outside
the FAA; except that the FAA may disclose these data outside the FAA for the following purposes, if any;
provided that the FAA makes such disclosure subject to prohibition against further use and disclosure:
• The information provided herein may be disclosed by the FAA for any purpose related to the use
and operation of related NovAtel supplied equipment, including without limitation, maintenance,
revision of equipment, design upgrades, testing, and any other required FAA activity.
This Notice must be marked on any reproduction of these data, in whole or in part.
The information contained in this document is subject to change without notice and should not be construed as
a commitment by NovAtel Inc. unless such commitment is expressly given in a covering document.
© Copyright NovAtel Inc.
NovAtel®is a registered trademark of NovAtel Inc.
All other brand names are trademarks of their respective holders.
Printed in Canada on recycled paper. Recyclable.

WAAS G-III Reference Receiver User Manual Rev 1 3
Table of Contents
Customer Service 9
Notices 10
Foreword 13
Scope .................................................................................................................................................. 13
Prerequisites ....................................................................................................................................... 13
Conventions ........................................................................................................................................ 13
Compliance with GPS Week Rollover ................................................................................................ 14
1 Introduction 15
1.1 SBAS Overview.............................................................................................................................. 15
1.2 Features ......................................................................................................................................... 16
1.2.1 GEO Processing................................................................................................................... 16
1.2.2 Cross-Correlation Detection ................................................................................................ 17
1.2.3 Bit Synchronization .............................................................................................................. 17
1.2.4 Signal Quality Monitoring ..................................................................................................... 17
1.2.5 Digital Pulse Blanking........................................................................................................... 17
1.2.6 Time Receiver Autonomous Integrity Monitor...................................................................... 17
1.3 Product Overview .......................................................................................................................... 18
1.3.1 Enclosure.............................................................................................................................. 19
2 Installation 22
2.1 Typical Installation ......................................................................................................................... 22
2.1.1 Install the G-III Reference Receiver in a rack ....................................................................... 23
2.1.2 Connect the External Frequency Reference ........................................................................ 23
2.1.3 Connect the GNSS Antenna ................................................................................................ 24
2.1.4 Connect the power supply ................................................................................................... 24
2.1.5 Connect the Ethernet ports .................................................................................................. 24
2.2 Optional Installation Steps............................................................................................................. 25
2.2.1 Check the Ethernet settings ................................................................................................. 25
2.2.2 Connect to the Maintenance port ........................................................................................ 26
2.2.3 Configure the Ethernet Port Settings ................................................................................... 26
2.2.4 Access the 1 PPS Output..................................................................................................... 27
2.2.5 Access the RF Output .......................................................................................................... 27
2.2.6 Access the 10 MHz Output ..................................................................................................27
3 Operation 28
3.1 G-III Reference Receiver States .................................................................................................... 28
3.2 G-III Reference Receiver Modes.................................................................................................... 28
3.3 Communicating with the G-III Reference Receiver ....................................................................... 28
3.4 Status Display................................................................................................................................ 29
3.4.1 Adjusting the contrast .......................................................................................................... 29
3.4.2 Operation.............................................................................................................................. 29
4 Commands 36
4.1 Entering Commands ...................................................................................................................... 36
4.1.1 Command Settings on Power-Up ........................................................................................ 36
4.1.2 Determining the Current Command Settings....................................................................... 38
4.1.3 Command Response ........................................................................................................... 39
4.1.4 Command Prompt................................................................................................................ 39
4.2 Functional Listing of Commands................................................................................................... 40

4 WAAS G-III Reference Receiver User Manual Rev 1
Table of Contents
4.3 Command Summary ......................................................................................................................41
4.4 Command Reference .....................................................................................................................44
4.4.1 AGCMODE ...........................................................................................................................45
4.4.2 ANTENNAPOWER ................................................................................................................46
4.4.3 ASSIGN ................................................................................................................................47
4.4.4 CHANCONFIG ......................................................................................................................49
4.4.5 CHANGESTATE....................................................................................................................50
4.4.6 CLEAREXCEPTIONDATA .....................................................................................................51
4.4.7 CORRSPACING....................................................................................................................52
4.4.8 DLLBW .................................................................................................................................53
4.4.9 ECUTOFF .............................................................................................................................54
4.4.10 ETHCONFIG .......................................................................................................................55
4.4.11 FIX.......................................................................................................................................56
4.4.12 ICOMCONFIG.....................................................................................................................57
4.4.13 IPCONFIG ...........................................................................................................................59
4.4.14 LOG ....................................................................................................................................60
4.4.15 NSCODE.............................................................................................................................62
4.4.16 PLLDYNAMIC ...................................................................................................................65
4.4.17 PULSEBLANKING .............................................................................................................67
4.4.18 RESET.................................................................................................................................68
4.4.19 RESTORE ...........................................................................................................................69
4.4.20 RFATTEN ............................................................................................................................70
4.4.21 RFIFTEMP...........................................................................................................................71
4.4.22 SAVEPORTS.......................................................................................................................72
4.4.23 SOFTLOADCOMMIT ..........................................................................................................73
4.4.24 SOFTLOADFINALIZE..........................................................................................................74
4.4.25 SOFTLOADRESET..............................................................................................................75
4.4.26 SOFTLOADSREC ...............................................................................................................76
4.4.27 SYSPROFILE ......................................................................................................................77
4.4.28 THRESHOLD ......................................................................................................................79
4.4.29 TRACKMODE .....................................................................................................................80
4.4.30 TRACKTYPE .......................................................................................................................81
4.4.31 UNASSIGN .........................................................................................................................82
4.4.32 UNLOG ...............................................................................................................................83
4.4.33 UNLOGALL.........................................................................................................................84
5 Data Logs 85
5.1 Log Header ....................................................................................................................................85
5.1.1 Log Triggers..........................................................................................................................87
5.2 Fields..............................................................................................................................................87
5.2.1 Field Types ...........................................................................................................................87
5.2.2 Commonly-Used Fields ........................................................................................................88
5.3 Functional Listing of Logs ..............................................................................................................91
5.4 Log Summary.................................................................................................................................92
5.5 Log Reference................................................................................................................................92
5.5.1 AGCINFOB ...........................................................................................................................93
5.5.2 ALLSQMIB............................................................................................................................95
5.5.3 ALLSQMQB ..........................................................................................................................96
5.5.4 ALMANACB ..........................................................................................................................97
5.5.5 CARDSTATUSB....................................................................................................................98
5.5.6 CORRDATAB......................................................................................................................107
5.5.7 CORRLOCATIONB .............................................................................................................108
5.5.8 ETHSTATUSB.....................................................................................................................109
5.5.9 EXCEPTIONDATAB ............................................................................................................110

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WAAS G-III Reference Receiver User Manual Rev 1 5
5.5.10 FACTORYDATAB ............................................................................................................. 111
5.5.11 MEASUREMENTDATAB .................................................................................................. 112
5.5.12 RANGEB........................................................................................................................... 115
5.5.13 RAWFRAMEDATAB ......................................................................................................... 117
5.5.14 RAWGPSSUBFRAMEWPB .............................................................................................. 119
5.5.15 RAWWAASFRAMEWPB................................................................................................... 120
5.5.16 RXCOMMANDSB ............................................................................................................. 121
5.5.17 SATPOSB ......................................................................................................................... 122
5.5.18 SOFTLOADSTATUSB ...................................................................................................... 124
5.5.19 TIMESOLUTIONB............................................................................................................. 125
5.5.20 VERSIONB........................................................................................................................ 127
6 Firmware Updates 128
6.1 Contact NovAtel .......................................................................................................................... 128
6.2 Download the Files ...................................................................................................................... 128
6.3 Decompress the Files .................................................................................................................. 128
6.4 Update the G-III Reference Receiver Firmware........................................................................... 129
6.4.1 Serial Port Loading using WinLoad.................................................................................... 129
6.4.2 Ethernet Softload Protocol................................................................................................. 129
A Technical Specifications 134
B Standards/References 140

6 WAAS G-III Reference Receiver User Manual Rev 1
Figures
1 Primary and Secondary Lightning Protection................................................................................11
2 SBAS Concept ..............................................................................................................................16
3 NovAtel G-III Reference Receiver .................................................................................................18
4 G-III Reference Receiver back panel ............................................................................................19
5 Typical Configuration.....................................................................................................................22
6 LCD Status Display........................................................................................................................29
7 Status Display page 1 ...................................................................................................................30
8 Status Display page 2 ...................................................................................................................30
9 G-III Reference Receiver Dimensions..........................................................................................135

WAAS G-III Reference Receiver User Manual Rev 1 7
Tables
1 Power Ports .................................................................................................................................. 19
2 Data Communication Ports .......................................................................................................... 20
3 Ethernet Port LEDs ....................................................................................................................... 20
4 Radio Frequency Ports ................................................................................................................. 21
5 Data port default settings ............................................................................................................. 25
6 Monitor port default settings ........................................................................................................ 25
7 RxState field values ...................................................................................................................... 31
8 RxHealth field values .................................................................................................................... 31
9 IOMStatus field values ................................................................................................................. 32
10 DSPCStatus field values .............................................................................................................. 33
11 RFCCStatus field values .............................................................................................................. 33
12 RFDCStatus field values .............................................................................................................. 34
13 TimeStat field values .................................................................................................................... 34
14 Factory Defaults for Commands .................................................................................................. 36
15 Response Messages .................................................................................................................... 39
16 Communication Commands ........................................................................................................ 40
17 Radio Frequency Control Commands .......................................................................................... 40
18 Tracking Control Commands ....................................................................................................... 40
19 General Receiver Control Commands ......................................................................................... 41
20 Position Command ....................................................................................................................... 41
21 Firmware Upgrade Commands ....................................................................................................41
22 Command Summary .................................................................................................................... 41
23 Channel Configuration Range ...................................................................................................... 49
24 Message Type .............................................................................................................................. 61
25 NSCODE Allowable Parameters for Signal Types ........................................................................ 64
26 SYSPROFILE Command Response Field Description ................................................................ 78
27 Legacy Log Header Format ......................................................................................................... 85
28 G-III Log Header Format .............................................................................................................. 86
29 Field Types ................................................................................................................................... 87
30 GNSS Time Status ....................................................................................................................... 89
31 Measurement Data Logs .............................................................................................................. 91
32 Satellite Data Logs ....................................................................................................................... 91
33 Receiver Status Logs ................................................................................................................... 91
34 Log Summary ............................................................................................................................... 92
35 AGC Status Word ......................................................................................................................... 94
36 IOMaster Warning Status Word ................................................................................................. 101
37 DSPC Warning Status Word ...................................................................................................... 102
38 RFCC Warning Status Word ...................................................................................................... 102
39 RFDC Warning Status Word ...................................................................................................... 103
40 IOMaster Error Status Word ....................................................................................................... 104
41 DSPC Error Status Word ............................................................................................................ 104
42 RFCC Error Status Word ............................................................................................................ 105
43 RFDC Error Status Word ............................................................................................................ 106
44 Tracking Type Data .................................................................................................................... 113
45 Channel Tracking Status ............................................................................................................ 114
46 Channel Tracking Status ............................................................................................................ 116
47 Parity Status ............................................................................................................................... 118
48 Commands Included in RXCOMMANDSB Log ......................................................................... 121
49 SOFTLOADSTATUSB Status Values ......................................................................................... 124
50 TRAIM Status ............................................................................................................................. 126
51 Performance Specifications ....................................................................................................... 134

8 WAAS G-III Reference Receiver User Manual Rev 1
Table of Contents
52 Physical Specifications ...............................................................................................................135
53 Environmental Specifications .....................................................................................................136
54 Port Specifications .....................................................................................................................136
55 Recommended External Frequency Reference Specifications ..................................................138
56 Channel Configuration ................................................................................................................139

WAAS G-III Reference Receiver User Manual Rev 1 9
Customer Service
Contact Information
If you have any questions or concerns regarding your G-III Reference Receiver, contact NovAtel using one of
the following methods:
NovAtel GPS Hotline: 1-800-NOVATEL (U.S. and Canada)
1-403-295-4500 (International)
Fax: [phone]
E-mail: [e-mail]
Website: www.novatel.com
Write: NovAtel Inc.
1120 - 68 Avenue NE
Calgary, Alberta, Canada
T2E 8S5
G-III Reference Receiver Firmware Updates
Firmware updates are firmware revisions to an existing model to improve basic GNSS receiver functionality.
The process for obtaining firmware updates is discussed in Chapter 6, Firmware Updates starting on page 128.

10 WAAS G-III Reference Receiver User Manual Rev 1
Notices
This equipment has been tested and found to comply with the limits for a class A digital device, pursuant to
Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications. Operation of
this equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Changes or modifications to this equipment not expressly approved by NovAtel Inc. could result in violation of
FCC and CE Marking rules and void the user’s authority to operate this equipment.
Lightning Protection Notice
What is the hazard?
A lightning strike into the ground causes an increase in the earth's potential which results in a high voltage
potential between the center conductor and shield of the coax cable. This high voltage develops because the
voltage surge induced onto the center conductor lags in time behind the voltage surge induced onto the shield.
Hazard Impact
A lightning strike causes the ground potential in the area to rise to dangerous levels resulting in harm to
personnel or destruction of electronic equipment in an unprotected environment. It also conducts a portion of
the strike energy down the inner conductor of the coax cable to the connected equipment.
Actions to Mitigate Lightning Hazards
1. Do not install antennas or antenna coaxial cables outside the building during a lightning storm.
2. It is not possible to avoid over-voltages caused by lightning, but a lightning protection device may be used
to shunt a large portion of the transient energy to the building ground reducing the over-voltage condition
as quickly as possible.

To maintain compliance with the limits of a Class A digital device, you must use properly
shielded interface cables when using the serial ports. Appropriate cables include Belden #9539,
or equivalent, and Belden #8770 cable for input power source (ensuring the shield is connected
to the protection ground).

CAUTION:
Double pole/neutral fusing

CAUTION:
The G-III Reference Receiver must be installed in a Restricted Access Location only.

The G-III Reference Receiver is not user-serviceable. In the event of any failure of the unit, do
NOT remove any cards or covering panels from the unit. Return the unit to the factory for repair.

Only qualified personnel, electricians as mandated by the governing body in the country of
installation, may install lightning protection devices.

Notices
WAAS G-III Reference Receiver User Manual Rev 1 11
3. Primary lightning protection must be provided by the operator/customer according to local building codes
as part of the extra-building installation.
4. To ensure compliance with clause 7 "Connection to Cable Distribution Systems" of EN 60950-1, Safety
for Information Technology Equipment, a secondary lightning protection device must be used for
in-building equipment installations with external antennas. The following device has been approved by
NovAtel Inc.:
Polyphaser - Surge Arrestor DGXZ+24NFNF-A
If this device is not chosen as the primary lightning protection device, the device chosen must meet the
following requirements:
• UL listed, or equivalent, in country of installation (for example, TUV, VDE and so on) for
lightning surge protection
• The primary device must be capable of limiting an incoming surge to 10kV
5. The shield of the coaxial cable entering the building should be connected at a grounding plate at the
building's entrance. The lightning protection devices should have their chassis grounded to the same
ground near to the building's entrance.
6. The primary and secondary lightning protections should be as close to the building's entrance as possible.
Where feasible they should be mounted onto the grounding plate itself. See also Figure 1, Primary and
Secondary Lightning Protection below.
Figure 1: Primary and Secondary Lightning Protection
Reference Description
1 Primary Lightning Protection Device
2 Secondary Lightning Protection Device
3 External Antenna
4 WAAS G-III Reference Receiver
5 To Ground
6 Grounding plate or grounding point at the building’s entrance

12 WAAS G-III Reference Receiver User Manual Rev 1
Notices
These installation instructions are the minimum requirements for receiver and antenna installations. Where
applicable, follow the electrical codes for the country of installation. Examples of country codes include:
• USA National Electrical Code (NFPA 70)
• Canada Canadian Electrical Code (CSA C22)
• UK British Standards Institute (BSI 7671)

Acceptable choices for Earth Grounds, for central buildings, are the following:
• Grounded interior metal cold water pipe within five feet (1.5 m) of the point where it enters
the building
• Grounded metallic service raceway
• Grounded electrical service equipment enclosure
• Eight-foot grounding rod driven into the ground (only if bonded to the central building
ground by #6, or heavier, bonding wire)

WAAS G-III Reference Receiver User Manual Rev 1 13
Foreword
Scope
The WAAS G-III Reference Receiver User Manual is written for users of the G-III Reference Receiver
subsystem. The manual contains sufficient installation and operation information to allow you to effectively
integrate and fully operate the unit. Additionally, each command used to configure the G-III Reference
Receiver, as well as each log used to capture data, is described in detail, including the purpose, syntax, and
structure of these messages. However, it is beyond the scope of this manual to provide details on service or
repair. Contact NovAtel for any customer-service related inquiries. See Customer Service on Page 9.
For information on GNSS and other details such as acronyms and a glossary, refer to the GNSS Book at
www.novatel.com/support/knowledge-and-learning/.
Prerequisites
The G-III Reference Receiver is a stand-alone, fully-functional GNSS and SBAS receiver. Refer to Installation
on Page 22, for more information on installation requirements and considerations. The G-III Reference
Receiver uses a comprehensive user-interface command structure. To use the full potential of the G-III
Reference Receiver, you should become familiar with this manual before operating the receiver.
Conventions
The following conventions are used in this manual:
Log and command conventions include the following:
H The letter H in the # Bytes or Binary Offset columns represents the header length for that log. The
binary header is described in Section 5.1 Log Header on Page 85.
0x A number following 0x is a hexadecimal number.
[ ] Parameters surrounded by [ and ] are optional in a command or are required for only some instances
of the command depending on the values of other parameters.
< > Text displayed between < and > indicates the entry of a keystroke in the case of the command or an
automatic entry in the case of carriage return <CR> and line feed <LF> in data output.
Where bit fields are identified by bit number, the least significant bit is bit 0
In tables where no values are given, the fields are reserved for future use.
Note that provides information to supplement or clarify the
accompanying text.
Caution that a certain action, operation or configuration may result
in incorrect or improper use of the product.
Warning that a certain action, operation or configuration may result
in regulatory noncompliance, safety issues or equipment damage.

14 WAAS G-III Reference Receiver User Manual Rev 1
Foreword
Compliance with GPS Week Rollover
The GPS week rollover issue refers to the way GNSS receivers store information regarding the current GPS
week. According to the official GPS system specifications document (ICD-GPS-200, paragraph 20.3.3.3.1.1),
"… 10 bits shall represent the number of the current GPS week…". This means the GPS week is represented by
an integer number between 0 and 1023. As GPS time started on Sunday January 6, 1980 at 0:00 hours, week
1023 ended on Saturday August 21, 1999 at 23:59:59.
In accordance with the GPS system specifications document, NovAtel G-III Reference Receiver firmware
resets the receiver's GPS week number back to zero. Users should be aware of this issue and keep in mind that
there may be a compatibility issue when purchasing and using different makes of GNSS receivers.

WAAS G-III Reference Receiver User Manual Rev 1 15
Chapter 1 Introduction
The NovAtel G-III Reference Receiver is a high-performance receiver designed for installation as a core
component of Satellite-Based Augmentation Systems (SBAS). This chapter provides information on the
features and functionality of the G-III Reference Receiver and how it operates in the context of the SBAS
system.
1.1 SBAS Overview
A Satellite-Based Augmentation System (SBAS) is a safety-critical system designed to augment the
Department of Defense Global Positioning System (GPS) Standard Positioning Service (SPS). SBAS enhances
GPS service by providing:
• a ranging function to the SBAS satellites to improve signal availability and reliability
• GPS signal corrections to improve accuracy
• integrity monitoring to improve safety
The primary mission of the SBAS system is to provide a means for air navigation for all phases of flight in the
National Airspace System (NAS) from departure, through en route, and approach. The principal functions of
SBAS include:
• determining ionospheric corrections
• determining satellite orbits
• determining satellite clock corrections
• determining satellite integrity
• independent data verification
• SBAS message broadcast and ranging
• system operations & maintenance
As shown in Figure 2 on Page 16, the SBAS system consists of a series of Reference Stations and Master
Stations, a Ground Uplink Subsystem, and Geostationary Satellites (GEOs). The Reference Stations, which are
strategically located to provide adequate coverage, record GPS satellite data and route it to the Master Stations.
The Master Stations then processes the data to determine the signal integrity, signal corrections, and residual
errors for each monitored satellite. This information is sent to the Ground Uplink Subsystem for transmission to
the GEOs, which then re-transmits the data on the L1 and L5 frequencies.

16 WAAS G-III Reference Receiver User Manual Rev 1
Chapter 1 Introduction
Figure 2: SBAS Concept
The NovAtel G-III Reference Receiver provides GPS monitoring functionality as part of the Reference Stations
in the SBAS network.
1.2 Features
To assist the Reference Stations in providing data with the necessary precision, the G-III Reference Receiver
has the following features:
• Support for L1, L2 and L5 GPS signal processing
• Support for L1 and L5 GEO signal processing
• GPS signal quality monitoring (SQM) functionality, see Section 1.2.4, Signal Quality Monitoring
on Page 17
• Digital pulse blanking
• Cross-Correlation Check
• Time Receiver Autonomous Integrity Monitor (TRAIM)
1.2.1 GEO Processing
Specific channels in the G-III Reference Receiver have the capability to receive and process the SBAS signal
provided by GEOs. The signals are in-band at L1 and L5 SBAS and are identified through SBAS-specific PRN
(PseudoRandom Noise) numbers. The SBAS message and associated pseudorange are provided as an output.
Geostationary
Satellite (GEO)
GPS Satellite
Constellation
L1 and C-Band
L1 and L5
L1, L2 and L5
C-Band
GPS User
Reference
Station
Reference
Station
Reference
Station
Master
Station
Ground Uplink
Subsystem
Integrity data,
differential corrections
and ranging control
Integrity data,
differential corrections,
time control and status

Introduction Chapter 1
WAAS G-III Reference Receiver User Manual Rev 1 17
1.2.2 Cross-Correlation Detection
Cross-correlation detection is a critical component of integrity monitoring systems such as the SBAS. Cross-
correlation can happen either during acquisition or while tracking.
The receiver tracks a satellite by maximizing the correlation between the received satellite's PRN code and the
locally generated code. Occasionally, this correlation is affected in the presence of another stronger satellite
PRN. Subsequently, the receiver tracks the incorrect cross-correlation peak of the other satellite PRN code
instead of correct main-correlation peak. In other instances, the receiver can track the minor correlation peak of
the received PRN code rather than the correct main correlation peak. Both situations lead to errors in range and
C/No estimates. GPS L1 C/A, SBAS L1 C/A and GPS L5 signals are particularly vulnerable to cross-
correlation.
The G-III Reference Receiver technology ensures independent real-time monitoring of cross-correlation for
GPS L1 C/A, SBAS L1 C/A, and GPS L5 signals. If at any point it detects the presence of cross-correlation, it
terminates the tracking. The channel then attempts to re-acquire the satellite signal.
1.2.3 Bit Synchronization
Bit synchronization identifies the location of navigation bit edges with respect to the primary PRN code
epochs. Bit edge detection is based on observing either the sign transition between successive accumulations
that are aligned with the received PRN code epochs or by aligning to the secondary synchronization codes. The
bit synchronization is verified by an additional hardware channel and software steering. This additional
hardware is configured to generate a stream of accumulations until sufficient data has been collected to perform
the test. The tracking channel is forced to re-acquire a signal if the results of the second test do not confirm the
bit alignment selected by the tracking channel.
1.2.4 Signal Quality Monitoring
Signal Quality Monitoring (SQM) technology monitors GPS and GEO signals in space for anomalous
behavior. To do this, the G-III Reference Receiver outputs accumulations at the specified correlation location
values. It collects inphase and quadrature accumulation values and outputs them in a timely fashion. The G-III
Reference Receiver hardware is capable of tracking the correlation function at multiple correlation locations.
1.2.5 Digital Pulse Blanking
Digital pulse blanking involves removing or attenuating pulses in the RF signal that exceed a specified level.
The G-III Reference Receiver provides digital pulse blanking for the L1, L2 and L5 signal paths.
Use the PULSEBLANKING command to enable/disable pulse blanking or to control its sensitivity. See Section
4.4.17, PULSEBLANKING on Page 67.
1.2.6 Time Receiver Autonomous Integrity Monitor
The Time Receiver Autonomous Integrity Monitor (TRAIM) is the algorithm in the G-III Reference Receiver
that computes the receiver time offset relative to the GPS time (within ± 150 nanoseconds) with a high level of
integrity. The TRAIM algorithm computes the time offset, excluding unhealthy satellites, and compares the
time using a minimum of 4 satellites. With good ephemeris health status from 4 or more satellites, the
computed time offset should typically be within a few hundred nanoseconds. The results from TRAIM
calculations are contained within the TIMESOLUTIONB log. For more information about this log, see Section
5.5.19, TIMESOLUTIONB on Page 125.

18 WAAS G-III Reference Receiver User Manual Rev 1
Chapter 1 Introduction
1.3 Product Overview
The NovAtel G-III Reference Receiver unit consists of the following:
• Standard enclosure for a 19-inch rack with built-in, forced air cooling
• Liquid crystal display (LCD) to show receiver status
• Input/output ports for power, antenna, frequency reference and general communications
Figure 3: NovAtel G-III Reference Receiver

Introduction Chapter 1
WAAS G-III Reference Receiver User Manual Rev 1 19
Figure 4: G-III Reference Receiver back panel
1.3.1 Enclosure
The G-III Reference Receiver is contained in an enclosure that is designed to fit standard 19-inch EIA racks.
1.3.1.1 LCD Status Display
The LCD display on the front of the G-III Reference Receiver enclosure provides basic status information
regarding the unit. See Section 3.4, Status Display on Page 29 for more details.
1.3.1.2 Input/Output Ports
The G-III Reference Receiver provides a variety of ports on the rear panel of the enclosure for power, antenna
input and general communications.
Table 1: Power Ports
Label Description
J01
The power input port.
Connects the G-III Reference Receiver to the 120/240 V power
source.
GND
Chassis ground.
Connects the G-III Reference Receiver to the mounting hardware
ground.
J01
GND

20 WAAS G-III Reference Receiver User Manual Rev 1
Chapter 1 Introduction
Table 2: Data Communication Ports
Label Description
J02
DATA
Data port
An Ethernet port used to configure the G-III Reference Receiver and collect
data from the receiver.
In a typical installation, this port connects directly to the Data Collection
Processor (DCP).
The port identifier is ICOM1.
The interface identifier is ETHA.
J03
MON
Monitor port
An output only Ethernet port used to collect data from the G-III Reference
Receiver.
This Monitor port is disabled by default, but can be enabled and mapped
using the ICOMCONFIG command.
The port identifier is ICOM2.
The interface identifier is ETHB.
J04
AUX
Auxiliary port.
This port is not available for use.
J05
MAINT
Maintenance port
An RS-232 port used to configure the Ethernet ports. This port operates at
115200 baud rate, no parity checking, 8 data bits and one stop bit.
The Maintenance port only accepts commands related to Ethernet
configuration and only when the receiver is in the Configuration state.
See Section 3.1, G-III Reference Receiver States on Page 28.
The port identifier is COM1.
Table 3: Ethernet Port LEDs
Label Description
Green
(top LED)
Shows the link status and activity of the Data port (J02) and the Monitor port
(J03).
Off = no link
On = link present
Blinking = activity on the port
Yellow
(bottom LED)
Shows the duplex status and collision activity on the Data port (J02) and the
Monitor port (J03).
Off = half-duplex connection
On = full-duplex connection
Blinking = there are collisions