Simulated GPS data on nRF9160 DK Asset Tracker Example

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

iotlight — Wed, 06 Mar 2019 00:35:14 GMT

Yes, it works now. Thank you very much.

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

hmolesworth — Tue, 05 Mar 2019 23:37:20 GMT

Try this:

// LA 34.05217,-118.14622
#define CONFIG_GPS_SIM_BASE_LATITUDE  3405217
#define CONFIG_GPS_SIM_BASE_LONGITUDE 1181462 // -ve so 'W'

LA is West, so instead of using '-' and 'E', use instead 'W':

	snprintf(tmp_str, GPS_NMEA_SENTENCE_MAX_LENGTH,
//		"$GPGGA,%02d%02d%02d.200,%8.3f,N,%09.3f,E,1,"
		"$GPGGA,%02d%02d%02d.200,%8.3f,N,%09.3f,W,1," // <== Use 'W' instead of 'E' and negative numbers
		"12,1.0,0.0,M,0.0,M,,*", hour, minute, second, lat, lng);

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

Markus Tacker (he/him) — Tue, 05 Mar 2019 17:21:03 GMT

We have started to investigate the issue. At the moment I have no ETA on when it will be fixed.

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

iotlight — Tue, 05 Mar 2019 08:31:17 GMT

Hi,

Any progress on this issue? We are planning our demo early next week, it will be nice to show Los Angeles in the map. Thanks.

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

AndreasF — Fri, 01 Mar 2019 12:23:56 GMT

Hi.

I've looked at the NMEA sentences in your log on both the pictures, and they appear to be correct, we are looking into the issue with the map.

Best regards,

Andreas

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

iotlight — Fri, 01 Mar 2019 00:14:26 GMT

I used Los Angeles decimal coordinates 34.0522308, -118.2436829

The messages seems correct, but the map is shown Japan, not Los Angeles, California.

Below is using Los Angeles DMS Coordinates as you suggested -11814621 in longitude

Please advise.

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

Markus Tacker (he/him) — Thu, 28 Feb 2019 20:16:50 GMT

The correct values for longitude is -11814.622

The entire NMEA sentence for the coordinates is

$GPGGA,134708.200,3405.217,N,-11814.622,E,1,12,1.0,0,0,M,0,0,M,,*45

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

AndreasF — Thu, 28 Feb 2019 13:59:34 GMT

Hi.

I'm unsure on whats happend with the map and I have reported this to the development team.

Best regards,

Andreas

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

iotlight — Wed, 27 Feb 2019 08:57:45 GMT

I followed your instruction to change lines 23 and 34 in file \ncs\nrf\lib\gps_sim\Kconfig

devzone.nordicsemi.com/.../Kconfig.txt

It seems like it showed the LA lat and long in the Messages, but I lost the map

Please let me know how to make the map shown Los Angeles, California.

Thanks.

RE: Simulated GPS data on nRF9160 DK Asset Tracker Example

AndreasF — Wed, 27 Feb 2019 07:33:59 GMT

Hi.

CONFIG_GPS_SIM_BASE_LATITUDE is calculated by the following steps:

Start-point latitude for simulated GPS data, from which the generated data will continue.
Calculated by deg * 100000 + minutes * 1000, for example 63 deg 25.280’N will be 6325280. 
Positive values are North, while negative values are South.

So 32.0522° N will be 3200000 + 5220 = 3205220

CONFIG_GPS_SIM_BASE_LONGITUDE is calculated by the following steps:

Start-point longitude for simulated GPS data, from which the generated data will continue. 
Calculated by deg * 100000 + minutes * 1000, for example 10 deg 26.201’E will be 1026201. 
Positive values are East, while negative values are West.

So 118.2437° W will be 11800000 + 2437000 = -14237000 since West are negative values.

Best regards,

Andreas