Radar sensor having a CFAR detector
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Jun 1, 2001
filing date -
Jun 1, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A constant false alarm rate (CFAR) detector prevents false radar triggers due to RF interference by proportionally increasing the radar detection threshold as interference increases. The radar operates with a randomized PRF, which randomizes detected RF interference while maintaining echo signal coherence. Post-detection filters provide a signal channel and an interference channel. The interference channel augments the threshold of the signal threshold detector. The interference channel gain can be adjusted to ensure the detection threshold is always higher than noise in the signal channel, thereby eliminating false alarms due to RF interference. Accordingly, the CFAR detector eliminates a major false alarm nuisance, particularly in radar security sensors. Applications for the low-cost system include indoor and outdoor burglar alarms, automotive security alarms, home and industrial automation, robotics, and vehicle proximity sensors.
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