gnss-sdr/src/utils/nav-listener

nav_msg_listener

Simple application that retrieves decoded navigation messages produced by GNSS-SDR and prints them in a terminal. This is only for demonstration purposes, as a example on how to retrieve data using the nav_message.proto file.

Build the software

This software requires Boost and Protocol Buffers.

In a terminal, type:

$ mkdir build && cd build
$ cmake ..
$ make

Usage

In order to tell GNSS-SDR to generate those messages, you need to include the lines:

NavDataMonitor.enable_monitor=true
NavDataMonitor.client_addresses=127.0.0.1  ; destination IP
NavDataMonitor.port=1237                   ; destination port

in your gnss-sdr configuration file. You can specify multiple destination addresses, separated by underscores:

NavDataMonitor.client_addresses=79.154.253.31_79.154.253.32

Run gnss-sdr with your configuration, and at the same time, from the computer of the client address (or another terminal from the same computer that is executing gnss-sdr if you are using 127.0.0.1), execute the binary as:

$ ./nav_msg_listener 1237

where 1237 needs to be the same port as in NavDataMonitor.port. As soon as gnss-sdr starts to decode navigation messages, you will see them in your terminal:

$ ./nav_msg_listener 1237

New Data received:
System: E
Signal: 1B
PRN: 11
TOW of last symbol [ms]: 75869044
Nav message: 000000001001010101010101010101010101010101010101010101010101010101010101010101010101010101010101010011100101110001000000

New Data received:
System: G
Signal: 1C
PRN: 16
TOW of last symbol [ms]: 75870000
Nav message: 100010111010101010101000101111000110001011001010010100011100010001000000000000000000000011010100000000101101100001000011000000000000000000000000111111101000010000110110011011000100000101111100000111100110110101000100110100100010011011101001001010011001011111111110000110000000000000000000000010001100

New Data received:
System: E
Signal: 5X
PRN: 18
TOW of last symbol [ms]: 75870260
Nav message: 0000100001111110010000010111110100011010010000100000000000000000000000000000000000000000000000000000000010101010000001001011010010100100100100100110101110110101010000100000000000000000111001011100010010100001010100001110101001001101111000000000

New Data received:
System: G
Signal: L5
PRN: 6
TOW of last symbol [ms]: 75871320
Nav message: 100010110001100011110001100010110010100111100001110100001000000110110101100101011100110111001101100001011001110110010100101110001000000010000000100000001000000010000000100000001000000010000000100000001000000010000000100000001000000010000000100000001000000010000000100000001000001010101010111110000000