common.xml: Added GPS_RTK and GPS2_RTK

This updates the GPS definition to include DGPS and RTK fixes, and has a new MAVLink message for sending RTK-specific info downstream.
Yes indeed! Woops!


-Niels


On Sun, Jun 15, 2014 at 4:23 AM, Anton Babushkin <notifications@github.com>
wrote:

> In message_definitions/v1.0/common.xml:
>
> > @@ -1285,7 +1285,7 @@
> >                 <description>The global position, as returned by the Global Positioning System (GPS). This is
> >                  NOT the global position estimate of the sytem, but rather a RAW sensor value. See message GLOBAL_POSITION for the global position estimate. Coordinate frame is right-handed, Z-axis up (GPS frame).</description>
> >                 <field type="uint64_t" name="time_usec">Timestamp (microseconds since UNIX epoch or microseconds since system boot)</field>
> > -               <field type="uint8_t" name="fix_type">0-1: no fix, 2: 2D fix, 3: 3D fix. Some applications will not use the value of this field unless it is at least two, so always correctly fill in the fix.</field>
> > +               <field type="uint8_t" name="fix_type">0-1: no fix, 2: 2D fix, 3: 3D fix, 4: DGPS, 4: RTK. Some applications will not use the value of this field unless it is at least two, so always correctly fill in the fix.</field>
>
> Should be 4: DGPS, 5: RTK maybe?
>
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> <https://github.com/mavlink/mavlink/pull/193/files#r13785572>.
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