Time Space Position Information (TSPI) notes


Time Space Position information is all about accurate referencing. Especially nowadays that high precision is critical for various air operations, either manner, unmanned, or testing of systems, TSPI is of paramount importance. Sensors employed in TSPI include theodolites, radars, GPS, IMU, RF sensors, optical techniques and others. Through sensor fusion multiple sensors can be combined for accuracy that comes down to few cm’s of position uncertainty. One of the basic problems associated with this process is that the aircraft coordinate system is different than the TSPI coordinate system. Transformation and post processing is not as simple as it might initially seem when looking for higher order accuracy where earth model concepts of world geodetic system (WGS-84) and geoidal separation have to be taken into consideration. Working with JM at the moment to develop some complete notes on the subject.

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