4.2. USING L-BAND PPP CORRECTION DATA WITH THE ASTERX-U
Step 6: Additional optional settings: RTK seeding
The AsteRx-U can use an RTK or DGPS position to reduce the PPP convergence time: a
process known as seeding. The configuration fields for seeding can be found in the GNSS,
Position window as shown in Figure 4-23.
RTK positions are typically expressed in a regional datum which depends on the local
RTK provider whereas TerraStar and VERIPOS PPP positions relate to the global ITRF2008
reference frame. To avoid coordinate jumps each time the PVT engine switches between
RTK and PPP modes and to ensure accurate seeding of the PPP engine from RTK, the regional
datum used by your RTK provider must be provided to the receiver. This can be done in the
Geodetic Datum field using the drop-down datum list. Alternatively, the datum shift can be
removed in the PPP Datum Offset field. The dx, dy and dz values will be subtracted from all
PPP coordinates.
Figure 4-23: Configuration fields of RTK/DGPS seeding
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