Setting a Timing Reference for Synchronizing GNSS Simulations
1. Hardware Connection
You need to connect 3 links from SecureSync to GSG8:
- 1PPS signal
- 10MHz signal
- RS232 – NMEA GGA & RMC serial Time Code messages
For connections between units:
Use a USB to SUBD serial adaptor (for distributing NMEA GGA & RMC serial Time Code messages)
Use BNC / MCX coaxial cables ( 2 cables for 1PPS and 10MHz signals)
2. SecureSync Side:
Set the ASCII output PORT (J1 port of a 1204-02 module for example):
Set both RMC and GGA as mentioned in the following example:
Offsets of 1PPS and RS232 signals can be adjusted if needed through GUI of SecureSync.
3. GSG8/Skydel Side:
Global Skydel Menu Setting:
Setting preference to get NMEA link:
Setting Time to your scenario:
Set the CDM5 Rear panel selector to EXT for taking in account the incoming 1PPS and 10MHz clock signals.
4. How to test if my synchronization is consistent?
In order to check synchronization result, please refer to our blog: Timing calibration of a GNSS receiver.