Arrangement for compensation of unwanted echoes caused by the movement of a radar device
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United States of America Patent
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-
Feb 4, 1986
Grant Date -
N/A
app pub date -
Nov 1, 1982
filing date -
Nov 11, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to compensate the unwanted echo caused by the movement of a moving radar device, an arrangement is provided between the output of a coherent oscillator and the input of a phase discriminator. This arrangement comprises a signal processing stage containing two series-connected phase regulating circuits, namely phase-locked loops. The output signal of the first phase-locked loop displays a mixed frequency which is formed by the sum of the frequency of the output signal of a signal generator and a displacement frequency modulated by the Doppler frequency of the unwanted echo caused by the movement of the radar device. In the second phase-locked loop the output signal of the first phase-locked loop is mixed with a further signal containing the displacement frequency.
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