| 摘要 |
Velocity sensing apparatus which permits measuring the velocity magnitude and sense of direction using the single radiating antenna illuminating a spot on the ground from which power is back-scattered to three receiving antennas. The receiving antenna outputs are grouped into pairs and processing of the signals done to obtain direct sum and quadrature sum waveforms with the point of crossing of the spectrum of the direct sum and quadrature sum waveform indicating the magnitude of velocity and the sign of the slope of the spectrum of the quadrature sum waveform determining the direction of the velocity.
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