Dear GPS / SW wizzards,
i have just seen a few nice things in the datasheet of the currently-used mediatek GPS:
The MEDIATEK-3329 seems to support
SBAS (Satellite_Based_Augmentation_Systems): WAAS, EGNOS,MSAS ,GAGAN Supported(Default: Enable)
Is this also used by the special DIY Drones GPS firmware ? - SBAS delivers much more accurate results than normal GPS.
Also, i have found another potentially interesting thing:
On Page 17 of the datasheet, it is described as Part of the GPRMC that the Magnetic Variation (same as Magnetic Inclination) which needs to be currently set with the flight planner is put out in the data.
Would it be maybe an idea to use this data from the GPS and make it only required to set the Magnetic Variation in case the GPS is not installed on the aircraft ? - This way, we could eliminate the manual setting required and make arducopter maybe a little user friendlier in case of changing locations ? - Just an idea..
You don't need declination without GPS - at all :-)
True - had not thought about this.
In any case, does anybody know where to recommend this enhancement ? - Or is this actually something which is not an enhancement or not possible for some reason afterall ?
The declination is for the compass to figure out what the magnetic variation is where you are relative to the magnetic north pole. Doesn't have a direct relationship to GPS, other than using the GPS to figure out what your declination is. I believe there's auto-declination calculation using GPS now, though I have not look at that section of the code recently.
Regarding the special firmware for MTEK, there's no change in functionality of the GPS. All the firmware does is modify the gps to output data in a binary(condensed) format so that it can send data faster at 10hz.