L89 GNSS module Time Issue

Hello!

I am using L89 GNSS module for time and location updating. We are based out of India and were trying to use GPS and IRNSS constellation.

We have made prototype board for evaluating the L89 module. What I observed was even though we kept it in open sky condition, $GPRMC packet shows Invalid flag for hours without success.

Just want to update you following which I received after reset:
$$PSTMVER,GNSSLIB_8.4.14.21_ARM43
$$GPTXT,L89NR01A06V01
23
$$PSTMVER,OS20LIB_4.3.0_ARM47
$$PSTMVER,GPSAPP_2.8.4_ARM
12
$$PSTMVER,BINIMG_4.5.12.4_ARM37
$$PSTMVER,SWCFG_81065329
6C
$$PSTMVER,STAGPSLIB_6.0.0_ARM5A
$$PSTMVER,STA8090_622bc043
6F
$$GPTXT,(C)2000-2018 ST Microelectronics29
$$GPTXT,L89NR01A06V01
23
$$PSTMSWCONFIG,1,0,12,0001050105070a0a0e0d0c0b0a090608070203630a110c04110c0155030130500f00000f0714000affffffffffffffffffffffffffffffffffffffffffffffff47
$$PSTMSWCONFIG,1,1,12,ffffffffffffffffffffffffffffffffffffffffffffffffffff010101000001094005ffffffffff5c9663094000081000000000000000000000000050000000
42
$$PSTMSWCONFIG,1,2,12,ffffffff00000000ffffffff000000000000000000000000ffffffff000000000000000000000000fffffffffffffffffffffffffffffffff090c02b0528200045
$$PSTMSWCONFIG,1,3,12,01323200050358020a0a0000fe0300001690813e0d0000bc000000000000000000000000000000000000000000000000000000000000000000000000ac07730d
4C
$$PSTMSWCONFIG,1,4,12,120000009a106464ae61840000000100ff0a0b0019000000010101000000000006000000ffffffff040000000100000000000080b004780503000000f0c3f7ff4F
$$PSTMSWCONFIG,1,5,12,00000000ffffffff000000000c0a00020fb4a005f5a30000010a1900330a0a1400510000800e000000001810000008000e01000000000000020f000000000000
42
$$PSTMSWCONFIG,1,6,12,0000e803ffffffff00000000ffffffff4810c703ffffffff9abed2e6edf2fafb00000202050601011d11ff000e010f01ff00ff000403ff0000000000000000004A
$$PSTMSWCONFIG,1,7,12,000000000000e03f0000000000000000000000000000f03fd3872ea86f754440938c9c853d8d2c403db83b6bb71b56404b0484b86d3da53e0cb8df888b2f9c3e
49
$$PSTMSWCONFIG,1,8,12,2b69a4292b1b503e0cb8df888b2f9c3e4b0484b86d3da53e000000000000000000000000000000005feffe78af8e44406c21c84109c32b40000000000000244040
$$PSTMSWCONFIG,1,9,12,1d8f19a88c8f4440598b4f0130be2b4000000000000024407ac2120f289f44402315c616828c2b400000000000002440ace28dcc239f444095826e2f698c2b40
12
$$PSTMSWCONFIG,1,10,12,00000000000024400f0c0c120f0c0c120f0c0c120f0c0c124c38394e52303141303656303100000000000000000000000000000000000000000000000000000025
$$PSTMSWCONFIG,1,11,12,0000000000000000000000000000000000000000000000000000000000000000
26

Received GPRMC packet as follows:
$$GPRMC,065336.000,V,1625.30005,N,08033.65754,E,130123,N*7A

Could some one guide me what to do to make module give proper NMEA output? Should I send any commands to make it work for GPS as well as IRNSS.

-Bhavani Shankar
sbshankar@efftronics.com

Hi Bhavanisurabhi,

I would like to ask what’s the environment you tested the module? L89 has a patch antenna( passive antenna ). Passive antenna does not have a good performance if the sky was sheltered.

Have you tried an active antenna?

I will send you the latest L89 firmware and upgrade tool. You can refer to L89_EVB_User_Guide.pdf, chapter 4.2.

After checking the antenna and upgrading, if you still can not get fixed. Please send me a 5 minutes log when you test in an open sky environment through my email raphael.wu@quectel.com . I will help you to verify.

Best regards