Xeos Alert Geomatics Resolute User manual

Resolute User Manual Version 2.5 i
Resolute User Manual
GNSS RECEIVER - AUTONOMOUS, LOW POWER, TELEMETERED
Version 2.5
Aug 2020

Resolute User Manual Version 2.5 i
Shipped From
Contact Us
Email
[email protected]
Phone
[phone]
Fax
[phone]
Website
www.alertgeo.com
About Us:
Alert Geomatics is the Geomatics arm of Xeos Technologies Inc., a telemetry, monitoring and
tracking company founded in 2004.
Version History
Version No.
Firmware Ver.
Date
Description
1.1
1.1.4147
Nov 2017
RTK Details Added
1.3
1.1.4641
July 2018
Tunnel Details Added, New Firmware Features
added
1.4
1.1.4769
Sept 2018
ASCII External Sensor Recording Added
1.5
1.1.4769
Jan 2019
Improved manual graphics
2.0
1.1.5205
Jan 2019
File Stream Buffering, XBD
2.1
1.1.5222
March 2019
Real Time Streaming: RTCM over cell
2.2
1.1.5504
June 2019
Ethernet functionality added
2.3
1.1.6048
Nov 2019
2.4
1.1.6272
Feb 2020
Memory Management functionality added
2.5
1.1.6650
Aug 2020
Hardware version upgrade
Alert Geomatics.
36 Topple Dr.
Dartmouth, Nova Scotia
Canada
B3B 1L6

Resolute User Manual Version 2.5 ii
Table of Contents
Shipped From................................................................................................................................... i
Contact Us........................................................................................................................................ i
About Us: ......................................................................................................................................... i
Version History................................................................................................................................. i
Overview ......................................................................................................................................... 1
Device Configurations..................................................................................................................... 1
Reference ................................................................................................................................... 1
Polar ........................................................................................................................................... 1
RTK PIN Base -RTK Base Receiver............................................................................................... 1
RTK PIN Rover -RTK Rover Receiver ........................................................................................... 1
NorthStar.................................................................................................................................... 2
Device Preparation.......................................................................................................................... 3
Making the Connection.............................................................................................................. 3
Removable Door: SD cards Access and SIM Installation............................................................ 5
Retrieving SD Cards ............................................................................................................... 6
Installing the Iridium SIM ...................................................................................................... 7
Installing the Cell microSIM ....................................................................................................... 7
Installing Power to the Unit ....................................................................................................... 8
Test Button and LED Behavior ........................................................................................................ 9
Test Button Operation ............................................................................................................... 9
LED Behavior .............................................................................................................................. 9
Installing a Resolute...................................................................................................................... 11
RTK Radio Network Design....................................................................................................... 11
Installing the GNSS Antenna .................................................................................................... 11
Installing the Radio Antenna.................................................................................................... 12
Installing the Cell Antenna ....................................................................................................... 13
Installing the Iridium Antenna.................................................................................................. 13
Installing RF Cables................................................................................................................... 13
Setting the Base Position (Base Stations Only)........................................................................ 13
Device Theory of Operation.......................................................................................................... 15
GNSS Receiver Theory of Operation ........................................................................................ 15

Resolute User Manual Version 2.5 iii
SD Cards Theory of Operation.................................................................................................. 15
Tunnel Theory of Operation..................................................................................................... 16
SBD: Theory of Operation ........................................................................................................ 18
XBD: Theory of Operation ........................................................................................................ 19
Device Configuration..................................................................................................................... 20
USB Diagnostic Port.................................................................................................................. 20
Using STerm and Sending Commands ..................................................................................... 21
Configuration Commands ........................................................................................................ 22
Timer Methodology............................................................................................................. 22
GNSS Configuration ............................................................................................................. 23
Collecting RINEX Data.......................................................................................................... 27
Configuring Base Station Correction Output....................................................................... 27
Recording External Sensors ................................................................................................. 28
SD Memory Management ................................................................................................... 29
RTK Radio Network Design .................................................................................................. 31
Radio Configuration............................................................................................................. 33
Configuring the Cell Modem ............................................................................................... 33
Embedded Telemetry Data Transfer: IP Tunnel Configuration........................................... 34
SBD and SMS and XBD Configuration.................................................................................. 34
Ethernet Configuration........................................................................................................ 35
Ethernet Latency Configuration .......................................................................................... 36
Switch Power Configuration................................................................................................ 36
Using the Tunnel: Connecting to the embedded servers and operation ..................................... 36
Accessing the HTTP Server ....................................................................................................... 37
Operating the HTTP Client........................................................................................................ 37
Automatic File Retrieval (Auto-Downloader)........................................................................... 38
Connecting to the Telnet Server .............................................................................................. 38
Operating the Telnet Client...................................................................................................... 38
Sending XBDs and SBDs Using XeosOnline .............................................................................. 38
XeosOnline Status of Health..................................................................................................... 39
Confirming Device Operation ....................................................................................................... 40
Confirm Power to the Unit....................................................................................................... 40
Confirming SD Cards Mounted................................................................................................. 40

Resolute User Manual Version 2.5 iv
Confirming GNSS Receiver Operation...................................................................................... 40
Confirming RTK Radio Operation (Base) .................................................................................. 40
Confirming RTK Radio Operation (Rover) ................................................................................ 40
Confirming Cell Operation........................................................................................................ 41
Confirming Cell Operation........................................................................................................ 41
Confirming Iridium Operation.................................................................................................. 41
XeosOnline .................................................................................................................................... 41
Upgrading Firmware ..................................................................................................................... 41
Appendix A: Command Index ....................................................................................................... 44
Appendix B: Antenna Type Index.................................................................................................. 49
Appendix C: GNSS Antenna Mount Diagram ................................................................................ 53
Appendix D: RF Cable Installation Diagrams................................................................................. 54
Appendix E: Example RTK Network Map ...................................................................................... 55
Appendix F: Mechanical Specifications......................................................................................... 56
Appendix G: Power Requirements................................................................................................ 57
Appendix H: RxTools Download.................................................................................................... 58
Appendix I: Iridium Service ........................................................................................................... 59
Warranty, Support and Limited Liability....................................................................................... 60

Resolute User Manual Version 2.5 1
Overview
The Resolute GNSS Receiver is an autonomous low power GNSS receiver with L1/L2 GPS and
GLONASS tracking abilities. Optionally, other satellite constellations and frequencies may be
added. The Resolute is powered by a flexible GNSS modem capable of RTK or Standalone data
collection.
The Resolute records GNSS data in the Septentrio Binary Format (SBF). Any blocks listed in the
SBF Reference Guide can be recorded at a configurable rate. Optional telemetry includes an
Iridium 9523 modem for both RUDICS and SBD, a cellular modem or 900 MHz Radio. The Resolute
is housed in a rugged enclosure and includes redundant SD cards capable of logging outputs from
external sensors.
Device Configurations
The Resolute is a flexible and powerful platform that comes in many different configurations. It
is important to realize that this manual may cover subjects that do not apply to your specific
device. Separate permission files are required for specific Resolute features, such as raw
measurements, Base station corrections, or some signals such as Galileo. Contact sales or support
for further clarification on which units contain which features. For a quick implementation guide
for your specific unit, please refer to the quick start guide.
Reference
The Reference Receiver is a GNSS receiver capable of recording raw GNSS measurements along
with standalone PVT (Position, Velocity, Time) data and many other SBF blocks. It is designed to
operate without any real-time corrections and can record data for post processing.
Polar
Similar to the Reference receiver, the Polar Resolute includes an Iridium 9523 modem for RUDICS
and SBD telemetry. The Polar Resolute also includes self-governing heaters for operation in
extreme cold, along with an IP67 enclosure.
RTK PIN Base -RTK Base Receiver
The RTK Base station is a correction generator for RTK measurements. Equipped with a 900MHz
radio or a connection to the internet, a single base station properly configured can broadcast a
correction service to one or more RTK Rovers. An RTK Base roughly measures an initial base
position and then measures deviations from this position to generate corrections. The Base
operates on the assumption that the Base antenna is not moving.
RTK PIN Rover -RTK Rover Receiver
The RTK Rover is the measurement and data collection sensor. Depending on the data filter
length (at receiver) and response time necessary, it is capable of measuring deviations on
centimeter or millimeter levels, when properly serviced with corrections. The RTK Rover should
be mounted to the desired landmark of whose movement is to be measured.

Resolute User Manual Version 2.5 2
NorthStar
The NorthStar is a correction repeater and communications unit that has two primary
functionalities relating to RTK receivers. First, it can be a correction relay unit to overcome
geographical issues such as distance and topography between the RTK Base and RTK Rover.
Secondly, can also be utilized as a collection point for RTK Rover data. In this second functionality,
the NorthStar can be attached to a server or doghouse computer and relay 30-second averaged
positions from any RTK Rovers in the radio network. While the theory of operation is similar to
the Resolute, the NorthStar is covered in a separate manual found at:
https://manuals.alertgeo.com/Northstar

Resolute User Manual Version 2.5 3
Device Preparation
Making the Connection
No.
Name
Function
1
USB-Mini
Provides access for configuration of device for deployment via PC
2
Test Button
Used as a test to check if the device is working properly and should
turn all the LEDs on. It also initiates the device’s connection to its
peripheral devices. Hold the button to reset the device.
3
Radio TNC
Connection to Radio antenna via TNC connector
4
2 BA Ground Stud
Grounding connection for lightning and surge protection
5
Serial/SDI-12/SW
LOAD
Connection to peripheral device via Serial/SDI-12, Serial output
and/or Switched power for peripheral device (14-Pin Female)
6
Power/ENET/CBUS
Connection to power supply, ethernet and CBUS connection (10-Pin
Female)
7
Iridium TNC
Connection to Iridium antenna via TNC connector
8
GNSS Type N
Connection to GNSS antenna via Type N connector
9
Cellular TNC
Connection to Cellular antenna via TNC connector
The front panel of the Resolute has up to 7 connectors, depending on the configuration to
connect to various antennas.
The USB (USB Mini) is used as a diagnostic I/O port for the device. Alternatively, Serial 1 on the
14-pin circular Souriau connector can be used as a diagnostic port. The user can set various
settings on the device through this port, as well as receive diagnostic output. It is also where the
device will accept firmware upgrades.

Resolute User Manual Version 2.5 4
The Type N connector on the panel is supplied to attach to one of the many supported GNSS
antennae. Depending on what modems (iridium, cellular or radio) you have installed, there may
also be TNC connectors for the various telemetry options as indicated on the label.
The 10-pin circular Souriau connector contains the power connections. The 14-pin circular
Souriau connector contains the serial port connections.
Below are the pinouts for the two connectors:
Circular Connector, 14-Pin Female
Pin
Function
A
TXD1-RS
B
N/C, PPS*
C
SDI-12 BUS
D
RXD1-RS
E
CTS+RS
F
GND
H
PWR-SW3
J
RTS1+RS
K
GND
L
RTS8+RS
M
PWR-SW4
N
TXD8-RS
P
RXD8-RS
R
CTS8+RS
*Note PPS is optionally connected. Must be requested from the factory at time of purchase.
Circular Connector, 10-Pin Female
Pin
Function
A
VBAT
B
GND
C
ETH RD-
D
ETH RD+
E
ETH TD-
F
ETH TD+
G
GND
H
CAN-H
J
CAN-L
K
GND
The power leads on the 10-Pin connector (A and B) are connected to the red (+) and black (-)
flying leads on the supplied cable. They require a DC power supply of 11V (minimum) to 28V
(maximum). For Resolute units with Cellular or Iridium telemetry a 3A supply is required.

Resolute User Manual Version 2.5 5
Removable Door: SD cards Access and SIM Installation
The Resolute has a removable door that allows access to the SD cards that are shipped with your
Resolute along with access to the SIM slots for optional Cell and Iridium Telemetry. Using a 3/32
Allen key, the four captive fasteners pictured below can be unscrewed from the main housing.
Opening the door will automatically unmount the cards to protect the stored data. No data will
be written while the door is removed.
Door fasteners in their unscrewed configuration. The door is free and able to be removed.
The image below shows the various components of the Resolute unit that can be viewed when
the door is open.
No.
Name
Function
1
Clock Battery
Used to maintain the internal clock of the Resolute
2
Iridium SIM Holder
SIM Cards mandatory for use with Iridium are inserted here
3
SD Card Holder
PCB holding both the MicroSD cards is stored here
4
Cell Micro SIM
Module for holding a cellular Micro SIM card is installed here
5
Radio
Radio module is mounted at this point (if applicable)

Resolute User Manual Version 2.5 6
Retrieving SD Cards
The two SD cards are of the microSD form factor and are mounted on a single removable
cartridge on the left side of the Resolute box. To remove the SD cartridge, grasp the edges and
pull in the direction of the opening of the enclosure. When replacing the SD cartridge, note that
the orientation of the cartridge does not matter as long as the cartridge is fully seated in its slot.
It is recommended to only use SLC industrial rated microSD cards. For firmware versions
equal to or greater than 1.4641, any capacity microSD is compatible. If using an earlier
firmware version, there is a storage capacity requirement of 4GB
The SD cartridge fully mounted on the PCB chassis.
When the cartridge is removed, labelling of the SD cards can be read from the two holders with
one holder on either side of the cartridge. SD 1 is recording GNSS data. SD 2 records unit
diagnostics.
If the SD cards are placed in the incorrect SD holders, the data will become mixed (diagnostic and
GNSS data on the same card). This has no effect on the performance of the unit but may cause
GNSS data to be removed from the card sooner than desired; read about the memory
management later in this section for more information.
The SD holders are of the push type. Simply push the SD card further into the holder to remove
the SD. The card will pop free upon releasing the card from the push. Push again to mount.
SD 2 Mounted on Left, Push Ejected on Right

Resolute User Manual Version 2.5 7
To resume recording after accessing the SD cards, mount the cards on the cartridge, then return
the cartridge to the PCB chassis and close the door. Upon closing the door, recording will resume.
Check that the SD LED is green to ensure both cards were mounted properly. Screw in the
fasteners to ensure the door is retained by the enclosure.
Installing the Iridium SIM
If your unit comes equipped with an Iridium modem, it requires a SIM to operate. Iridium SIMs
can be purchased through the parent company, Xeos Technologies, an Iridium Value Added
Reseller. If only using SBDs, a register only SIM is required. If using RUDICS, your SIM will need to
be activated for RUDICS use. Before inserting or removing the Iridium SIM, verify no power
applied to the unit. To access the Iridium SIM slot, open the SD card door of the Resolute. Using
a 3/32 Allen key, the four captive fasteners pictured below should be unscrewed from the main
housing.
The Iridium SIM slot is immediately above the SD Cards. The contact plates of the SIM card must
face the SD cards. Insert the SIM by pushing the SIM in place. A fully installed SIM is flushed with
the SIM holder. For people with large fingers it may be easier to insert or remove the SIM if the
SD cartridge is removed first.
Iridium SIM Ejected (Correct Orientation) on Left, Seated on Right
Installing the Cell microSIM
If your unit comes equipped with a cell modem, it requires a micro SIM to operate. Cell SIMS can
be purchased from your local cellular carrier. The default modem standard of the Resolute is
GSM. If you wish to use a CDMA carrier, this must be specified at purchase time. The Resolute
also requires an APN (Access Point Name) to be configured to connect to your carrier’s network.
See the Configuring the Cell Modem Section for more information.

Resolute User Manual Version 2.5 8
Cell SIM Inserted on Cell modem (4)
Installing Power to the Unit
The Resolute requires power supply capable of sourcing three amp surge currents at 12 V. this
can be reduced to one amp if no Iridium or Cellular modem is present. The power cable supplied
has a red ring that matches the red ring of the power connector on the box. Appendix G outlines
average power consumption requirements for various configurations of the Resolute.
The majority of units in the field will be powered by battery and solar panel. It is recommended
to utilize a charge controller for your battery equipped with a low voltage disconnect. This will
increase the lifespan of your battery.
It is also important to ground the Resolute for lightning and surge protection. The ground stud is
located to the left of the serial connector and is pictured below. The thread of the grounding stud
is 2 BA
2 BA Threaded Ground Stud

Resolute User Manual Version 2.5 9
Test Button and LED Behavior
Test Button Operation
The test button operation is controlled by variable length button presses. Additional confirmation
feedback to these button presses is provided by the response of the LEDs. A summary table is
provided at the bottom of this subsection.
To turn on the lights, press the test button (roughly one second press). This will light up the LEDs
for the next 15 minutes. This is useful for confirming the unit is working and communicating with
the network.
Holding the test button longer than three seconds resets the unit. After three seconds of holding
the test button, the LED’s will begin to flash yellow to confirm releasing will reset the unit.
Holding the test button longer than 10 seconds will, in the case of a Base Station, reset the static
Base position and the unit. The GNSS LED flashing blue confirms this hold period. For an RTK
Rover, the GNSS LED will still flash blue, but the unit will only reset. A 10 second button press, on
a Rover will not reset the Base the Rover is communication with over radio. This operation must
be done at the base.
Holding the button for 20s cancels all the above operations and the LEDs turn off. It is safe to
release the button at that point if you did not wish to reset the unit or the base position.
Press Length
Unit Response
LED indication
~1s - 3s
LEDs On
LEDs On
3s - 10s
Software Reset
Flashing Yellow LEDs
10s - 20s
Base Position Reset (Base Only) and Software Reset
GNSS LED flashing blue
20s +
Cancel Above Responses
Off
LED Behavior
Confirming the correct operation of the unit is an important step in installing the unit. The LEDs
on the unit are designed to assist in this confirmation. The LEDS are automatically on after power
up for 15 minutes to assist with installation. LEDS can be reactivated with a quick 1s button push
at any point. The below table indicates the meanings of the LEDs.

Resolute User Manual Version 2.5 10
Power LED
Behaviour
Meaning
Red
Reverse voltage applied
Green
Unit is powered
No LED
Unit is not powered
SD LED
Behaviour
Meaning
Red
SD Cards unmounted / Safe to remove
Yellow
1 SD card mounted. Not safe to remove
Flashing Yellow
1 SD card mounted, and writing to card. Not safe to remove
Green
2 SD cards mounting. Not safe to remove
Flashing Green
2 SD cards mounted, writing to cards. Not safe to remove
GNSS LED
Behaviour
Meaning
Red
GNSS receiver on, no valid positions received in last 30s, < 4 SV tracked
Yellow
Last position received is valid (non RTK), Tracking at least 4 satellites
Blue
Last position received RTK Float
Green
Last position received RTK Fixed
No LED
GNSS is not powered
Iridium LED
Behaviour
Meaning
Red
Modem on
Green
RUDICS Tunnel confirmed connected to XeosOnline
Flashing Green
SBD successfully sent to gateway
No LED
Iridium modem is not Powered
Cellular LED
Behaviour
Meaning
Red
Modem on
Green
Cell is registered to Network
No LED
Cell is not powered
Radio LED
Behaviour
Meaning
Red
On
Yellow
Sending correction (RTK Base), receiving correction (RTK Rover)
Green
A Rover is registered (RTK Base), registered to Base (RTK Rover)
No LED
Radio is not powered
Ethernet LED
Behaviour
Meaning
Red
Ethernet is enabled
No LED
Ethernet is disabled

Resolute User Manual Version 2.5 11
Installing a Resolute
When installing a Resolute it is important to choose the installation site thoughtfully. It should
be noted that there are differences when installing Rovers, Bases, and Reference receivers which
will be highlighted in the following sub sections.
RTK Radio Network Design
Before leaving the office, if your unit includes a radio for broadcasting or receiving corrections,
best practice is to determine the radio network for your device. Consider any already installed
units that you want to avoid disturbing or include in your network. See the example radio
network drawings in the Appendix E in addition to the RTK Radio Network Design section for
more information. It is easiest to configure the radios in the office before leaving, but
configuration is possible to do in the field. Record the radio channel numbers of various units for
future reference.
Easiest installation order is generally from Base to NorthStars (if utilized) to Rovers as this allows
the installer to confirm corrections are being received at the Rovers before concluding install.
Installing the GNSS Antenna
The GNSS Antenna is the measuring point of the Resolute. Installing the antenna in ideal
conditions will increase the performance of your units. The antenna should ideally be installed
with a 180 degree uninterrupted view of the sky. If this is not possible, maximizing the volume of
the sky in view is advantageous. Keep in mind the majority of GNSS satellites do not pass directly
overhead, but travel closely to the horizon. The GNSS antenna will perform better if metallic
objects and other reflective surfaces are not in the immediate vicinity. This means the antenna
should be mounted one meter off the ground or other surface if possible. It should also be above
surrounding buildings if possible.
For RTK Rovers and Reference stations, GNSS antenna should be monumented to the desired
landmark to be measured. This means that the antenna should be attached in such a way that if
the landmark moves the antenna will be moved by the same amount. Keep in mind of the thermal
expansion when mounting the antenna to the landmark, especially for fine deformation
monitoring.
If an RTK Base is being installed, the antenna should be monumented to a piece of land that is
not moving. Bedrock if available is great for this. Any movement of the Base antenna will present
itself as movement of the Rovers in the data.

Resolute User Manual Version 2.5 12
A-03-058 GNSS Antenna Mount
See Appendix C for specific GNSS antenna mount installation instructions if you purchased an
antenna and mount from Alert Geomatics.
Installing the Radio Antenna
If your unit is equipped and configured to send information over radio, installing a radio antenna
is necessary. The radio antennas come in two flavors, Yagi and Omni antennas. Yagi antennas are
directional antennas and are best used when communicating with only one other radio. Omni
antennas are omni-directional antennas and are best used when a radio must communicate with
multiple devices.
Both Yagi and Omni radio antennas work on a line of sight basis, with a range up to seven
kilometers (4.3 miles) in ideal conditions. Mounting a radio antenna higher in general will allow
the radio antenna to transmit over more obstacles in the path between radios. If line of sight is
not possible between radios, NorthStars are perfect for relaying corrections over or around
obstacles and are not inhibited by the GNSS antenna mounting requirements.
Rovers equipped with radios only need Yagi antennas. Install the Yagi on a pole, or other high
point in a horizontal orientation, and point the Yagi to the nearest source of corrections. Poles
are advantageous for mounting as they allow 360 degrees of orientation. The smallest element

Resolute User Manual Version 2.5 13
of the antenna is the “front” of the antenna when orientating. The antenna comes equipped with
mounting hardware.
Bases can be equipped with Yagi or Omni antennas depending if they are broadcasting to a single
endpoint, or multiple end points. If multiple end points for the corrections from the base are
needed, an Omni antenna must be used. If installing a Yagi, point the Yagi to the desired endpoint
for the corrections. If installing an Omni, mount in a vertical orientation, on a mast or other high
point. The antenna comes equipped with mounting hardware.
Installing the Cell Antenna
If your unit comes equipped with a cellular modem, install the cellular whip antenna in a vertical
orientation. While a cell antenna does not have the additional stringent requirements of the
other antennas, a cell antenna should not be contained in a metal box.
Installing the Iridium Antenna
If your unit comes equipped with an Iridium modem, the Iridium antenna needs to be installed.
This antenna should be installed with as clear a view of the entire sky as possible.
Similar to GNSS satellites, Iridium satellites travel closer to the horizon than over top of your
location. There are a limited number of satellites in the sky, so to maintain the best possible
connection, the larger the continuous volume of the sky the antenna can see the better.
The Iridium antenna can cause interference with the GNSS receiver so should be placed a
minimum of 1 meter away from the GNSS antenna; 10 meters of distance is ideal.
Installing RF Cables
Connecting the RF cables to the antennas involves transitioning the cables through a weather
protective enclosure for the Resolute and the power system. This can be done, depending on the
environment, through a downspout on the enclosure, or through polyphasers in the wall of the
enclosure (not supplied).
If using polyphasers, the polyphaser in line with the GNSS antenna must allow +15V DC Pass-
through, as the GNSS antenna is active. RF cables supplied by Alert Geomatics are marked with a
part number and color code. The color code matches the ring around the connector on the panel
to allow for easy tracing of cables. For an assembly diagram of the various RF cable configurations
see Appendix D.
Setting the Base Position (Base Stations Only)
Setting the Base position tells the unit that the Base is configured in its final location. This MUST
be done for all RTK Base units and should be done after installing the GNSS antenna at the base
site and powering the unit. To automatically find the Base press the test button for 10 seconds
until the GNSS LED starts to flash blue. Release the button and the unit will reset along with
wiping the previously stored base position. The GNSS modem will start up and calculate a new
Base position that will be stored to survive power resets. Automatically setting the Base position

Resolute User Manual Version 2.5 14
will allow the RTK Rovers attached to the Base to make relative measurements from this position.
The unit will store this information through power resets.

Resolute User Manual Version 2.5 15
Device Theory of Operation
The Resolute at its heart is an embedded peripheral control unit. All enabled peripherals,
including the GNSS are controlled by a scheduler, which can be controlled by the user. Each
peripheral has three separate timer settings using the scheduler: duration, interval and offset.
Duration is the length of time the peripheral is on. Interval describes how often the device comes
on. Offset offsets the interval by the specified amount of time. Using these three parameters, the
timing of powering the peripherals can be controlled. A peripheral can be set to always on by
setting the duration to 0.
GNSS Receiver Theory of Operation
The GNSS receiver operates on the scheduler like all other peripherals. The GNSS outputs
configurable Septentrio Binary Format (SBF) blocks at a configurable rate. The Resolute can
subdivide these outputted blocks into four file ‘streams’. Individual streams are recorded to their
own files, and have the ability to record SBD blocks at different rates across streams. The files
produced from steams are individually configurable in length.
SD Cards Theory of Operation
Data written to the SD cards is initially written to circular buffers in SRAM as of firmware version
5200. SRAM buffering allows for higher data recording rates, and greater data verification. Data
is assigned a buffer based on the configuration of the data streams, with Stream 1 and 3 writing
to card 1, and Stream 2 and 4 writing to card 2.
If you wish to upgrade to firmware version 5200+ from a lower version number, please
verify you have SRAM installed on your unit by contacting Alert Geomatics.
An SRAM buffers will empty its contents to its respective SD card when the buffer reaches 70 %
full. While the file is being written to, the file is ‘open’ on the device, this makes it important to
notify the device when you are shutting it down.
Proper shut down etiquette is to either send the device a $resetnow command or to hold the
test button for 3+ seconds. Failure to do so will cause the file to be left open. Open files are
partially recoverable on a computer provided they are not written over. Files are written to the
SD card use a naming convention with an ASCII representation of BASE-36 characters with the
following name format:
SSFYYMDH.sbf
SS
Two-character representation of device serial number
F
Stream Source (1-4, D (Diagnostics))
YY
Two-character representation of year
M
Month of year
D
Day of Month