ComNav SinoGNSS M300 Mini(G) User manual

M300 GNSS Receiver Quick Tour
©2012-2014 ComNav Technology Ltd, all rights reserved
www.comnavtech.com

M300 GNSS Receiver Quick Tour
©2012-2014 ComNav Technology Ltd, all rights reserved
All rights reserved. No parts of this work may be reproduced in any form or by any means -
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While every precaution has been taken in the preparation of this document, the publisher and
the author assume no responsibility for errors or omissions, or for damages resulting from the
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profit or any other commercial damage caused or alleged to have been caused directly or
indirectly by this document.

Contents
Chapter1 Introduction........................................................................1
1.1 Package list............................................................................................................................ 1
1.2 M300 enclosure receiver introduction ................................................................................. 1
Chapter2 System installation..............................................................2
2.1 Front panel introduction....................................................................................................... 2
2.2 Antenna installation .............................................................................................................. 2
Chapter 3 Configuration OEM Card by CRU software ..........................3
3.1 Connected with GNSS receiver ............................................................................................. 3
3.2 Receiver configuration .......................................................................................................... 4
3.2.1 Raw data recording set up.............................................................................................. 4
3.2.2 Get correction message from Radio or Ntrip................................................................. 6
3.2.2.1 Get correction message from Ntrip............................................................................. 6
3.3 Main information check ........................................................................................................ 8
3.3.1 Satellites information and global map view................................................................... 8
3.3.2 RTK status indication ...................................................................................................... 9
3.4 Raw data management ....................................................................................................... 10
3.4.1 Raw data download...................................................................................................... 10
3.4.2 Memory management.................................................................................................. 11
3.4.3 Rinex convert................................................................................................................ 11
3.5 Sending command to Receiver............................................................................................ 12
Chapter 4 M300 Frequently Used ASCII Command............................13
4.1 Base station configuration .................................................................................................. 13
4.2 Rover configuration............................................................................................................. 14
4.2.1 Set Rover to differential mode..................................................................................... 14

4.2.2 Check the solution type................................................................................................ 15
4.3 Change the serial port baud rate ........................................................................................ 15
4.4 Satellites constellation system configuration ..................................................................... 16
4.5 log raw data of GNSS observations..................................................................................... 16
4.6 Update the OEM Card ......................................................................................................... 17
4.7 Update radio firmware........................................................................................................ 19
Appendix A...........................................................................................20

1
Chapter1 Introduction
1.1 Package list
Thanks for choosing ComNav M300 enclosure GNSS receiver. Please check the evaluation
package you received with the package list as following.
No.
Name
Quantity
Index
1
Enclosure receiver
1
2
A/C adapter
1
3
Data cable
1
From PC to receiver, RS232 to 7 pin cable
4
GNSS antenna
1
5
GNSS antenna cable
1
6
Radio antenna
1
Some special application case, special antenna
supplied
1.2 M300 enclosure receiver introduction
M300 receiver with 1 GNSS OEM card inside and integrated with radio data link, is mainly used
in high accuracy application, e.g., positioning, monitoring, construction, marine, etc.
M300 GNSS receiver

2
Chapter2 System installation
2.1 Front panel introduction
Front panel of M300 receiver
Ref. # Description
❶3 LED indicates the work status of the receiver.
PWR: power indicator. After power on, this LED will light in red colour
SAT: satellites indicator. It will flash several times every 5 seconds, which means how many
satellites locked by the receiver.
LINK: correction message. As a base station, flash once per second means sending correction
message 1/s; as a rover, it means receiving correction message. In the raw data recording mode
(data recorded in the memory of receiver), this LED will also flash according to sampling interval.
❷TNC GNSS antenna connector
❸TNC UHF antenna connector
❹DC1: serial port communication with Com 1 of OEM Board. Appendix A: the Pin definition
of this port.
❺DC3: serial port communication with internal UHF and Com 3 of OEM card.
2.2 Antenna installation
The Installation of GNSS antenna is a very important factor affecting the performance of
receivers. It will have a great influence on the visibility of satellites and SNR, so the antenna
should be in open area and far away from big power electromagnetic radiation devices.
1
4
3
2
5

3
Chapter 3 Configuration OEM Card by CRU software
Compass Receiver Utility is a windows-based GUI that allows you to access most features of the
receiver without the need to use a terminal emulator or to write special command. CRU lets
you easily communicate with and configure the receiver via serial ports or Ethernet connection,
using a PC with Windows XP or Windows 7 operating system on it.
Compass Receiver Utility is available on the webpage
http://www.comnavtech.com/download.asp?bigclassid=28
3.1 Connected with GNSS receiver
You can use serial port of PC to connect with the receiver, the default baud rate is 115200
(OEM Card baud rate).
Go to Set port, set up the connections, and click OK
If the connection is successful, you will see that the SN number of receiver will show on the left
top of software operation window; if not, please check the power and connection of all parts.

4
❶Connection status: SN No. of receiver, the data download path. You can select the data
download path from the left function bar-> Folders, then select the folder path.
❷Main menu: all the operation of software menu can be found here.
❸Shortcut bar: make it easy to access some frequently used operation.
❹Function bar: select the function, such as data download, convert to Rinex data.
❺Main window: show the information such as PVT view, SV sky plot view, and hyper terminal.
3.2 Receiver configuration
3.2.1 Raw data recording set up.
Go to the shortcut bar, click .
Satellites configuration:
Mask angle, GPS/Beidou/Glonass
Raw data sample interval, 1/2/5.
Data log: auto mode—save the raw data in the memory of OEM card (100MB memory card)
Tips, after do the configuration, please click apply setting, power off and power on the receiver
1
2
3
4
5

5
Local log: log the raw data to local PC, the file name will be auto named and stored in the
current folder path. In this mode, you can define the raw data message type as shown below.

6
3.2.2 Get correction message from Radio or Ntrip
3.2.2.1 Internal Radio setup
This step is for setting up internal UHF frequency and protocol. You must link DC3 port to set
radio parameters. Go to in shortcut bar, set up the Frequency and protocol (same as
external transmit radio).
3.2.2.1 Get correction message from Ntrip
Make sure your laptop or PC can use internet.
Go to , there are two protocols to receive the correction data: internet-TCP direct and
Ntrip mode. If the protocol is TCP direct mode, input the IP address and port and click Connect;
If using the Ntrip mode, tick the Ntrip mode then click Connect.
Tips: The internal radio airlink rate is 9600bps, and the radio is linked to com2 of GNSS
board as the baud rate of 115200bps. So you must set the airlink baud date of transmit
radio as 9600 bps, and the com2 baud rate of GNSS board as 115200 bps (the default band
rate is 115200).

7
This screenshot shows the Ntrip Mount Point. Select the right Mount Point and input the User
name and Password, at last click OK.
3.2.3 Work mode configuration
To change the work mode (Base station or Rover), you can edit the command package and sent
to the receiver.
For example, if you want to start M300 as Base station, go to , some predefined command
package list can be seen below.

8
Click Edit, You can edit the command package that sent to receiver, then click OK
Click Apply and follow the indication to start base M300 as Base station.
After starting base station, use DC3 link with external radio, and set the external radio interface
baud rate as 38400 bps (to match with the correction message)
3.3 Main information check
3.3.1 Satellites information and global map view
: The list of output messages by receiver, such as BESTPOSB, BESTVELB and TIMEB
information
: Satellite information, such as SNR and elevation.

9
Sky View: You can go to main menu, View-> Sky view, to callout it. Click the constellation to
enable or disable the SV system.
:Make sure your PC logs on the internet. This will show the current position on the
global map.
3.3.2 RTK status indication
After the receiver receives correction message, the receiver will calculate the ambiguity and
turn to differential mode.
❶Position mode: SINGLE->Narrow Float ->NARROW INT (autonomous mode-> RTK Float->RTK
fixed)
❷Differential age: 99 (No correction message), 1 (received correction message).
❸Diff: Correction message data flow.

10
3.4 Raw data management
3.4.1 Raw data download
Raw data can be recorded in the memory of receiver or PC.
Download the data from memory of receiver: if you go to , the files list will appear
in the Main window. You can modify the raw data, such as station name, antenna height. After
selecting the file and right click, you can download to the current folder.
1
1
2
1
3
1

11
3.4.2 Memory management
Go to in shortcut bar, you can format the memory or clear the files that you deleted to
the recycle bin.
3.4.3 Rinex convert
After downloading raw data to the project folder, then you can convert it to Rinex format. Click
in the function bar, you will see the raw data in current project.
Go to the shortcut bar- , define the Rinex version and export observation information;
then go to the main window, select the file and right click to convert to Rinex format. Go to the
raw data files to check the Rinex format data.

12
3.5 Sending command to Receiver
In the shortcut men, go to , in this page you can send ASIC command to receiver.

13
Chapter 4 M300 Frequently Used ASCII Command
4.1 Base station configuration
Sending command to DC1, RTCMV3 as the broadcast format, the default baud rate is
115200bps.
Command
Description
Unlog all
remove all log information currently in used
fix auto
fix the current coordinates as base coordinates
log com3 rtcm1004 ontime 1
com2 output EXTENDED GPS RTK L1/L2
Tips:
interfacemode com3 auto auto on
Set com3 auto detecting correction message and get to differential mode, but at the same
time any command sent through com3 will not respond.
interfacemode com3 compass compass on
Set com3 not to detect correction message and receiver will turn differential mode to
autonomous mode, and then COM3 can accept all the OEM card commands.
The default setup for COM3 is “interfacemode com3 auto auto on”, so you have to send
command “interfacemode compass compass on”, then send OEM card command though
com3; but for com1, you can send any command to receiver.
Tips：
1. All the commands send to receiver, do not distinguish between letter case, e.g., log
version=LOG VERSION.
2. After inputting every command, press Enter button to change line and input another
command.
3. For more detailed command information, please refer to ComNav OEM CARD
REFERENCE MANUAL.

14
log com3 rtcm1104b ontime 1
com2 output EXTENDED Beidou RTK B1/B2/B3
log com3 rtcm1012b ontime 1
com2 output EXTENDED GLONASS RTK L1/L2
log com3 rtcm1005b ontime 5
Base station coordinates
Log com3 rtcm1033b ontime
10
Receiver description
saveconfig
Save the current setting to the receiver, next time when
receiver is power on those setting will activate
To set a receiver as a base station for example, you my use DC1 to connect with PC, use DC3 to
output RTCM V3, and send the following command to request GPS, Beidou and GLONASS (if
available) RTK observations:
unlogall
fix auto
log com3 rtcm1004b ontime 1 % GPS RTK observations
log com3 rtcm1104b ontime 1 % Beidou RTK observations
log com3 rtcm1012b ontime 1 % GLONASS RTK observations (if available)
log com3 rtcm1005b ontime 5 % Base station coordinates
log com3 rtcm1033b ontime 10 % Receiver description
com com3 38400 % change the DC3 linkrate to match the external transmit radio
saveconfig
4.2 Rover configuration
The internal radio is connected to COM2 of OEM board, if M300 receive the correction data, It will go to
the differential mode automatically.
4.2.1 Set Rover to differential mode
If M300 is connected with external device, such as external radio and Ntrip bridge.
Send the following command;
Tips: There are 3 types of GNSS RTK observations according to constellation system, GPS
(RTCM1004), Beidou (RTCM1104) and Glonass (RTCM1012). Send different commands
according to constellations.
Tips: If you want to start the base station on known points (such as 31.123 N degree,
123.456E, 45 Height), please fix the base station coordinates by using the command.
fix position 31.123 121.456 45

15
interfacemode <port> <input-message> <output-message> on
For example: useDC3 to receive external correction data, send the following command though
DC1:
Command
Description
com com3 9600
Match with external radio link rate.
interfacemode com3 auto auto on
Auto detect the correction message type
Saveconfig
Save the setting to the receiver
4.2.2 Check the solution type
Send command to output GPGGA information to check the solution type:
log <port> gpgga ontime <frequency>
Frequency description: 1 (1 HZ); 2 (1 output every 2 seconds); 0.2 (5 HZ).
For example;
$GPGGA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,M,<10>,M,<11>,<12>*hh<CR><LF>
$GPGGA,012827.00,3110.484867,N,12123.913553,E,4,05,1.4,39.4,M,8.012,M, 2.0,0031,*6E
<6> GNSS solution type：0=Fix not available，1=GPS FIX，2=RTD，4=RTK FIXED，5=RTK floating, 6=
Dead Reckong mode, 7= Manual input mode, 8= Super wide-lane mode,9= WASS MODE
4.3 Change the serial port baud rate
To check the baud rate, use the command:
log comconfiga
The reply is as follow:

16
Change the band rate command:
com <port> <band rate>
For example: com com1 9600 %Change com1 baud rate to 9600bps
4.4 Satellites constellation system configuration
Command
Description
lockout bd2
Lock out Beidou system
lockout gps
Lock out GPS system
lockout glonass
Lock out GLONASS
unlockoutall
Unlock all GNSS system
4.5 Log raw data of GNSS observations
Raw data request command:
The ephemeris requests two different formats, you can use either of them.
ComNav Raw data Request command
(ephemeris in ComNav format)
ComNav Raw data Request command
(ephemeris compiler with Novatel format)
log com1 rangecmpb ontime 1
log com1 rangecmpb ontime 1
log com1 rawephemb onchanged
log com1 gpsephemb onchanged
Log com1 glorawephemb onchanged
Log com1 gloephemerisb onchanged
log com1 bd2rawephemb onchanged
log com1 bd2ephemb onchanged