AGPS and BRDC GPD file format?

Ai-Thinker-Open / GPRS_C_SDK

Ai-Thinker A9/A9G GPRS (with GPS(A9G)) module C development SDK

MIT License

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Open jupyterknight opened 4 years ago

jupyterknight commented 4 years ago

I want to use AGPS feature in this module, I see it download a file named brdcGPD.dat.

Does anyone know what is this file and what is its format? And any idea I can make this file for my country?

Thank you very much.

P/S: It looks like the company no longer support this SDK, but I hope that there is someone know this.

pulkin commented 4 years ago

Hi, I am working on a micropython port where you can poll base stations and look up their location.

win32cpp commented 4 years ago

I have a similar question above. Does anyone have any information on creating a BRDC GPD file?

pulkin commented 4 years ago

I implemented agps in my port. It is possible to use a local database but they are quite large so the performance will be really low.

aerosales10 commented 4 years ago

I'm also trying to use the AGPS module but it fails:

[GPS][src/gps.c][Http_Get][786]>>"recv len:3577,data:HTTP/1.1 200 OK Content-Type: application/x-zip-compressed
[GPS][src/gps.c][GPS_AGPS][908]>>"GPD file length:3332"
[GPS][src/gps.c][GPS_AGPS][914]>>"GPD file length(with padding 0):3584"
[GPS][src/gps.c][GPS_CMDSend][378]>>"gps send nmea cmd:$PGKC149,1,9600*1D,len:20"
[GPS][src/gps.c][OnCmdAckFail][404]>>"gps ack time out"
[GPS][src/gps.c][GPS_SendCMDWaitAck][425]>>"GPS exec command fail"
[GPS][src/gps.c][GPS_SendWaiteNormalAck][468]>>"ack cmd check fail, wish:1, actual:0"
[GPS][src/gps.c][GPS_AGPS][921]>>"set binary mode fail"
AGPS RESULT:0

win32cpp commented 1 year ago

Has anyone identified the GPD file structure yet?