Notes on specifications
To achieve full accuracy in real time, the RT products will require appropriate differential
corrections where applicable, either from a base station or with a TerraStar licence.
Alternatively, a RINEX file can be downloaded post-mission and used to post-process
the data to full accuracy.
For the TerraStar service, at least 30 minutes of open-sky condition may be required
before full accuracy is achieved. This service can easily achieve this accuracy in airborne
applications.
The “1” specification has been used for parameters where offset cannot be measured by
the RT, for example position (the offset of the base station cannot be found by the RT
alone). The “RMS” specification was used where the offset is known, for example
velocity. For angles and measurements derived from the angles, the “1” specification is
used because the mounting of the RT compared to the vehicle gives an offset the RT
cannot measure.
The accuracy of the product will depend on the operating mode of the GNSS. For
example, an RT3000 operating without differential corrections enabled will have the
specifications of the RT3000 L1 only.
Heading accuracy
The heading accuracy that can be achieved by the dual antenna system in the RTs in Table
5 is 0.2° 1σ per metre of separation in ideal, open sky conditions. The system can provide
these accuracies in static and dynamic conditions. A four-metre separation is required to
reach the accuracy listed in Table 5. The maximum recommended separation is five
metres, at which it may be possible to achieve better accuracy than that listed if the
structure is rigid, including temperature variation.
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