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sparkfun / SparkFun_u-blox_GNSS_Arduino_Library

An Arduino library which allows you to communicate seamlessly with the full range of u-blox GNSS modules
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base station location through rtcm data #227

Closed jasvinder1079 closed 4 months ago

jasvinder1079 commented 4 months ago

hello @nseidle , Thanks for the amazing work, I am new to gnss domain. My question is, Does rtcm data consist of base location info also or only corrections ,if yes can we extract it in rover and how ?

PaulZC commented 4 months ago

Hello Jasvinder (@jasvinder1079 ),

The best place to ask questions like this is the SparkFun GNSS Forum: https://community.sparkfun.com/c/global-positioning-system-gps/96

The RTCM1005 and RTCM1006 messages both contain the base location - in ECEF X/Y/Z format. The RTCM message format is proprietary to RTCM, you need to purchase the specification to see how the messages are constructed. But you will find some examples in v3 of the SparkFun GNSS library:

https://github.com/sparkfun/SparkFun_u-blox_GNSS_v3/blob/main/examples/ZED-F9P/Example24_getLatestRTCM1005/Example24_getLatestRTCM1005.ino

https://github.com/sparkfun/SparkFun_u-blox_GNSS_v3/blob/main/examples/ZED-F9P/Example25_RTCM1005_Callback/Example25_RTCM1005_Callback.ino

Best wishes, Paul

jasvinder1079 commented 4 months ago

Thanks @PaulZC , In the provided example ,the API u provide for base location giving in ECEF(x,y,z) format ,Can we convert this into lat long or utm coordinate ?And how accurate this is.

PaulZC commented 4 months ago

The best place to ask questions like this is the SparkFun GNSS Forum: https://community.sparkfun.com/c/global-positioning-system-gps/96

There are standard numerical methods to do the conversion, but it depends on which datum (ellipsoid) you are using. The numbers will be different for WGS84 compared to NAD83.