Can not receive GPS data by AirPrime® EM7455 M2M Module


#1

It can receive GLGSV data, but can not receive longitude and latitude data.

$GNGSA,A,1,*00
$GPGGA,0,66
$GPRMC,V,N
53
$GLGSV,3,1,10,78,06,014,70,73,347,86,40,322,77,*50
$GLGSV,3,2,10,80,79,09,050,69,22,043,84,18,158,*5E
$GLGSV,3,3,10,85,71,196,71,39,246,*6D
$GPGSV,3,1,09,02,05,28,070,07,04,029,08,*78
$GPGSV,3,2,09,09,13,65,115,15,26,206,16,02,313,*4C
$GPGSV,3,3,09,18,45,272,*4F
$GNGNS,NNN,1D
$GPVTG,T,M,N,K,N
2C
$GPGSA,A,1,*1E
$GNGSA,A,1,*00
$GPGGA,0,66
$GPRMC,V,N
53
$GLGSV,3,1,10,78,06,014,70,73,347,86,40,322,77,*50
$GLGSV,3,2,10,80,79,09,050,69,22,043,84,18,158,*5E
$GLGSV,3,3,10,85,71,196,71,39,246,*6D

Should it use active or passive GPS antenna?

Thanks,
Jie


#2

at!gpsstatus?
Current time: 1980 01 06 6 00:30:48

1980 01 06 6 00:00:00 Last Fix Status = FAIL, FAILCODE = 0
1980 01 06 6 00:29:59 Fix Session Status = ACTIVE

No TTFF available

OK
at!gpsnmeasentence?
!GPSNMEASENTENCE: 0x29FF

OK
at!gpsonly?
!GPSONLY: NOT IMPLEMENTED

OK
at!custom?
!CUSTOM:
GPSENABLE 0x01
IPV6ENABLE 0x01
UIM2ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01
SINGLEAPNSWITCH 0x01