Radar or sonar detection system
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United States of America Patent
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-
Jul 1, 1986
Issued Date -
N/A
app pub date -
May 24, 1985
filing date -
Nov 12, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An intruder detector system employing Doppler radar consists of an encoder for modulating RF pulses with a cyclic pulse code, the code being cycled at a frequency equal to the RF pulse frequency and the pulses being modulated on a VHF carrier for transmission along one of a pair of parallel radiating cables. The signal received from the other cable is demodulated and digitized by a zero crossing detector functioning as a 1-bit analog-to-digital converter. A bank of exclusive-OR gates functioning as 1-bit correlators then simultaneously correlates each successive bit of the digitized signal with the values of the respective bits in each fixed position of the transmitted code sequence.
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