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What is CORS network? How to connect to CORS network with external Bluetooth module and mobile phone?

A CORS is a Continuously Operating Reference Station. The CORS is an appealing way to do RTK due to its convenience and large coverage area. While Tersus Precis-BX305 currently does not support build-in NTRIP client feature. An alternative way to connect CORS network is employing external Bluetooth module and a cellphone. Here is a detailed procedure about how to connect to CORS Network with Precis-BX305 board. 
Demonstration of connecting Precis BX305 to CORS Network
Hardware & Software Requirement
  • Precis-BX305
  • GNSS antenna
  • GNSS antenna cable 
  • External Bluetooth module
  • Bluetooth cable
  • Cell phone (android system)
  • 5V DC chargerSoftware required
  • Ntrip client (free android apps)

  
Connect to CORS Network
Please follow below steps. 
  • Connect GNSS antenna to Precis-BX305.
  • Connect external Bluetooth module to either COM1 or COM2 of the board
  • Connect to power supplier and plug in/turn on the power
  • Turn on the Bluetooth of the mobile phone and scan and pair the mobile phone with the external Bluetooth device. By default, the external Bluetooth device name is ‘HC-06’ and the default PIN is ‘1234’. You can manually change the device name when you are trying to connect multiple Bluetooth devices.
  • Install NTRIP Client APP from App store and launch this App.
  • Configure Settings->Receiver Settings. Set Receiver Connection as ‘External via Bluetooth’. Set Bluetooth Connection Method as Secure. Tick Auto-Enable Bluetooth.
  • Configure Settings->Ntrip Settings. Launch NTRIP Client and configure the NTRIP Settings as below, then click Connect
    • Network Protocol：NTRIP V1.0
    • Caster IP & Port:
    • Username & Password
    • Data Stream: RTCM32
    • Reported Location: Automatic
As the CORS network may require the approximate location of users, the Ntrip client allows to report the location by automatic or manual way. By automatic means the client read NMEA GGA data from the board and send to Ntrip caster, so the board have to be output NMEA GGA sentences in this way. Failure to report user location may cause connection failure. Alternatively, you can manually report the latitude and longitude to the Ntrip caster.


If you have further questions, feel free to contact us to info@tersus-gnss.com or visit our official website www.tersus-gnss.com

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