Doppler radar system
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United States of America Patent
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Jun 21, 1983
Grant Date -
N/A
app pub date -
Jul 30, 1980
filing date -
Jul 31, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a Doppler radar system any one received signal contains components having different Doppler frequencies. This is because the received signal is derived from reflections off a range of different positions within the beamwidth of the system. It is often only that frequency component which is derived from a reflection along the boresight of the system which is of interest. Difficulty arises in determining which component this is. Because of variations of the reflective properties of the surface from which the reflections are received, it cannot correctly be assumed to be the strongest component. The invention identifies the components of the received signals derived from reflections along the boresight of the system by analyzing each of two signals received at different times, into components having different Doppler shifts. Values are then calculated of the relative strengths (e.g. ratios or differences) of components of the two signals derived from reflections off the same position. These relative strength values are not greatly affected by variations in the reflection properties of the surface and can be used to determine accurately the frequency components of the signals derived from the boresight.
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