Can't lock on to L2CM without enable L1CA first ? Is it a normal thing for GPS receiver ? #51
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Greetings, while I am messing around with some recorded IF data files, I notice that for some reason the file contain only L2CM signal could not be detected or locked on any GPS satellites. I try to go outside and hooked up to a real antenna and true enough It can't detect any GNSS sattelites with only L2CM channels. As soon as I enable L1CA with L2CM. It is immediately pick up both L1CA and L2CM from GNSS sattelites. Is is a norm in GNSS receivers that you do the acquisition in L1CA frequency first ? |
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Pocket SDR will not search for L2CM unless it is already tracking L1C/A, L5I or L5Q signal from the same satellite. This is intended to shorten the total acquisition time. If you wish to disable this behavior, please edit the following line and rebuild the libraries and applications. PocketSDR/src/sdr_rcv.c (L30) #define MAX_ACQ 4e-3 // max code length w/o acquisition assist (s) |
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Pocket SDR will not search for L2CM unless it is already tracking L1C/A, L5I or L5Q signal from the same satellite. This is intended to shorten the total acquisition time. If you wish to disable this behavior, please edit the following line and rebuild the libraries and applications.
PocketSDR/src/sdr_rcv.c (L30)
#define MAX_ACQ 4e-3 // max code length w/o acquisition assist (s)
->
#define MAX_ACQ 25e-3 // max code length w/o acquisition assist (s)