Doppler Velocity and Position

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Doppler Velocity and Position (abbr Dovap)</strong> </dt>
A continuous-wave trajectory measuring system using the Doppler effect caused by a target moving relative to a ground transmitter and receiving stations. </dd>
The transmitter interrogates a frequency doubling transponder and the output is received at three or more receiver sites for comparison with the interrogation frequency. The intersection of ellipsoids formed by the transmitter and each receiver site provides the spatial position of the target. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use