AGPS and XTRA GPS _ Code Aurora Forum
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descarga de datos AGPS para un mejor geolocalizacion en dispositivos moviles, especialmente Android.
Transcript of AGPS and XTRA GPS _ Code Aurora Forum
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Wed,12/14/201118:39 #1
hadim
Thu,12/15/201108:39 #2
wealas
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AGPSandXTRAGPS
AGPSandXTRAGPSHi,
HowcanIenableAGPSandXTRAGPS?IdidntfindanyXTRAGPSserveroninternet.HoweverIgotoneforAGPS:supl.google.com
SoIsetthegpsipdecimalonSetAGPSConfig().ButIdontknowhowtoenablethedownload...
Lastquestion:doyouknowanyXTRAGPSserverIcoulduse?andhowenableitwithGobiAPI?
Cheers,
Re:AGPSandXTRAGPSI'vebeenunabletogetXTRAtowork,maybebecauseIcan'tfindhowtosettheserverintheAPI.I'vebeenabletosettheautomaticXTRAdownloadsuccessfullybutwhenItrytoforceanXTRAdownloadIgetaweird1033error.ForagpsyoufirstneedtosetthePDSoperationmodeto1(atleastIthinkyouhaveto)usingtheSetPDSDefaultscallandthensettheagpssettings.HereisthecodeIusedthistosetittothegoogleserver:
operation=c_ulong(1)timeout=c_byte(64)interval=c_ulong(1000)accuracy=c_ulong(5)exit=gobi.SetPDSDefaults(operation,timeout,interval,accuracy)print'SetPDSDefaultsexitcode:'+str(exit)
pAgpsServer=c_ulong(struct.unpack('>I',struct.pack('BBBB',*map(int,'74.125.127.192'.split('.'))))[0])pAgpsPort=c_ulong(7276)exit=gobi.SetAGPSConfig(pAgpsServer,pAgpsPort)print'SetAGPSConfigexitcode:'+str(exit)
pPdsEnabled=c_ulong(1)exit=gobi.SetPDSState(pPdsEnabled)print'SetPDSStateexitcode:'+str(exit)
IthinkitworkedbecauseIwasseeingatleast10satellitesbeingprobed
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hadim
Thu,12/15/201109:13 #3
Thu,12/15/201109:22 #4
wealas
Thu,01/05/201212:57 #5
dlukas
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rightawaybutIthinkyoualsoneedtohavetheGSMconnectionactiveotherwiseI'mnotsurehowthedevicecanconnecttotheagpsservers.Re:AGPSandXTRAGPSThefunctionsrunwellbutdoesntseemstohaveanyeffectonmydevice.GPSfixstilldoesntcomeevenoutsideandwithatotallybluesky...HoweverIseesomestallites(10moreorless).AndwiththebestconditionIgot3satelittes"enabled"whichmeanswithSNR>0.
Whendoyougetafix?numberofsatelitteswithSNRandhowmucharetheSNR?Canyouactuallyseeifdeviceisdownloadinganythingonsupl.google.com,becauseIdontseeanythinginmylog.
Lastquestion:whatisSNR?:D
Re:AGPSandXTRAGPSSNRsignaltonoiseratiohttp://en.wikipedia.org/wiki/Signaltonoise_ratioThat'sawaytomeasurehowusablesignalis.
I'veneveractuallygottenafixbutIonlyplayedwiththeGPSonenightinmyhotelroomwhichdidn'thavethebestofviews.Imanagedtogetonly1satelliteenabledandlaterattemptsresultedingpsdnotlikingthedatacomingontheNMEAportsoIdidn'tseeanything.
Idon'tthinkwe'llbeabletoseeanytraffictotheagpsserverbecauseIthinkthatwouldhappeninthedevicefirmware(thusnoinfointheOS)andIdoubttherewillbeanyinfoontheNMEAport.ButmaybeI'mwrong.
Ialsodon'tknowifthatagpsserverisvalid.IcanconnecttotheportandIfoundpostsonlineaboutpeopleusingitbutIcan'tverifythismyselfandIdon'treallycareabouttheGPSthatmuchconsideringIhaveaphonethatworksjustfine:)Re:AGPSandXTRAGPSTheGobi3000APIareratherlimitedinwhatyoucando,andsomeofit(IE:AGPS)isjustacarryoverfrompreviousproducts,andisntsupportedonGobi3000.
Ifyoureallywanttoplaywiththesethingsindepth,usethenewextensibleAPIwevejustreleasedhttps://www.codeaurora.org/patches/quic/gobi/Gobi/
Fulldocumentationshouldbeshowingupshortlyondeveloper.qualcomm.com(lookforQMI_PDSPositionDeterminationService)
Notethatwhatisandisnotsupportedvariesgreatlybetweenchips,soexpectalotoftrialanderror.IllbehappytoprovidewhathelpIcan,butImnotoneoftheGPSdevelopersforthisproject.
