Accurate and reliable GNSS positioning
Oxford Technical Solutions Ltd

Tightly coupling inertial data to GNSS inside an INS can offer a significant performance improvement in difficult GNSS conditions. Oxford Technical Solutions’ (OXTS) gx/ix technology works in two main modes. Gx mode uses IMU dead reckoning alongside previous GNSS updates to predict what sort of satellite messages the GNSS receiver would expect. This allows individual satellite signals to be screened and those that differ significantly from expected values, for example, due to multipath errors, can be ignored. This ensures that a much more robust and reliable position can be maintained with fewer jumps.

Ix mode or single satellite aiding allows the data from satellites to be used individually rather than combined. This speeds up RTK reacquisition during brief outages (such as passing under a bridge) and also reduces position drift when there are too few satellites in view to maintain a position.

Quad constellation GNSS receivers can also offer a much more stable position in difficult GNSS conditions simply by tracking more satellites. With an increased number of satellites available more of the time, better position modes such as RTK can be maintained for a longer test duration.

However, OXTS users no longer need to choose between the strengths and trade-offs of these two modes, with the release of full quad constellation gx/ix integration. Tightly coupling data from every available GNSS satellite to a high-grade IMU gives users the best of both worlds and ensures that their position is as accurate and reliable as possible – even in the harshest testing environments.

Booth: 10032

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