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Tangential velocity measurement using interferometric MTI radar

United States Patent

January 3, 2006
View the Complete Patent at the US Patent & Trademark Office
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Radar systems use time delay measurements between a transmitted signal and its echo to calculate range to a target. Ranges that change with time cause a Doppler offset in phase and frequency of the echo. Consequently, the closing velocity between target and radar can be measured by measuring the Doppler offset of the echo. The closing velocity is also known as radial velocity, or line-of-sight velocity. Doppler frequency is measured in a pulse-Doppler radar as a linear phase shift over a set of radar pulses during some Coherent Processing Interval (CPI). An Interferometric Moving Target Indicator (MTI) radar can be used to measure the tangential velocity component of a moving target. Multiple baselines, along with the conventional radial velocity measurement, allow estimating the true 3-D velocity of a target.
Doerry; Armin W. (Albuquerque, NM), Mileshosky; Brian P. (Albuquerque, NM), Bickel; Douglas L. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
10/ 675,328
September 30, 2003
STATEMENT OF GOVERNMENT INTEREST The United States Government has rights in this invention pursuant to Department of Energy Contract No. DE-AC04-94AL85000 with Sandia Corporation.