Extended GNSS API

Tachyon
1

I can only find reference to outputting lat/long from the API query - any methods to get more GNSS stats (or even NMEA?) like PDOP, no. of sats etc.?

2

Hey zedslarr

We are literally expanding this at the moment.

I'll see if Brett can post the updated information here for your feedback - should be a few days to get it out!

Thanks

Nick.

3

Hi @zedstarr !

Yes, I'm currently working on expanding the GNSS data object to include the following data. Please note it might change a bit in it's final form.

typedef struct
{
    uint64_t last_lock_time_ms;  // Time in milliseconds from the last latitude/longitude update or fixmode/gpssta change
    char svnum;                  // Number of visible GPS satellites
    char beidou_svnum;           // Number of visible BeiDou satellites
    nmea_satellitemsg slmsg[12]; // Up to 12 GPS satellites
    beidou_nmea_satellitemsg beidou_slmsg[12]; // Tentatively up to 12 BeiDou satellites
    nmea_utc_time utc;           // UTC time
    double latitude;             // Latitude
    char nshemi;                 // Hemisphere (North/South): 'N' = North, 'S' = South
    double longitude;            // Longitude
    char ewhemi;                 // Hemisphere (East/West): 'E' = East, 'W' = West
    char gpssta;                 // GPS status: 0 = No fix; 1 = Non-differential fix; 2 = Differential fix; 6 = Estimated
    char posslnum;               // Number of GPS satellites used for positioning (0–12)
    char possl[12];              // Satellite IDs used for positioning
    char fixmode;                // Fix type: 1 = No fix; 2 = 2D fix; 3 = 3D fix
    int pdop;                    // Position dilution of precision (PDOP), 0–500 (represents 0.0–50.0)
    int hdop;                    // Horizontal dilution of precision (HDOP), 0–500 (represents 0.0–50.0)
    int vdop;                    // Vertical dilution of precision (VDOP), 0–500 (represents 0.0–50.0)
    int altitude;                // Altitude, scaled up by 10 — divide by 10 for actual value in 0.1 meters
    int speed;                   // Ground speed, scaled up by 1000 — divide by 10 for actual value in 0.001 km/h
} GnssData;
1 Like
4

Looks like that's just supporting GPS/Beidou right now but I notice from the datasheet the QCM6490 device supports GPS, GLONASS, NavIC, BeiDou, Galileo, QZSS, and SBAS - really interested in GPS/GLONASS/Galileo/Beidou support, will tthat be included?

5

Hi zedstarr,

We'll check - baidou and GPS are in the structure, but it's unclear if the other services use those structures as well (or something else). Thanks!

6

A post was merged into an existing topic: PCIe HAT questions

7

Sorry, I don't understand the link to the PCI HAT topic???

8

The PCIe HAT answer was accidentally posted into this this topic instead of the PCIe topic and I moved it. It doesn't have anything to do with GNSS.

9

Sorry if that was my bad... too many tabs... :blush:

10

Hi @zedstarr ! These new GNSS features are available now: