Ranging systems
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United States of America Patent
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-
Mar 24, 1998
Grant Date -
N/A
app pub date -
Feb 27, 1990
filing date -
Mar 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A continuous wave ranging system comprises a modulator for modulating an r.f. carrier signal in accordance with a pseudo random code, a transmitting antenna for radiating the signal towards a target, a receiving antenna and receiver for detecting the signal reflected from the target, a correlator for correlating the detected signal with the transmitted code with a selected phase shift corresponding to the current range gate to be tested, whereby the range of the target from the system may be determined, and filtering means for filtering from the output of the correlator those range gate amplitudes which vary with a frequency less than a predetermined value.
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