Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1985-05-24
1986-07-01
Jordan, Charles T.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5PD, 367101, 367 93, G01S 1300, G01S 728, G01S 968
Patent
active
045982937
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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W. B. Allen and E. C. Westerfield, Digital Compressed Time Correlators and Matched Filters for Active Sonar, Journal Acoustic Society America, vol. 36, No. 1, Jan. 1964, pp. 121-139.
International Standard Electric Corporation
Jordan Charles T.
Meagher Thomas F.
O'Halloran John T.
Steinberger Brian S.
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