Method and circuit for extraction of Doppler information from a

Details Method and circuit for extraction of Doppler information from a Method and circuit for extraction of Doppler information from a

1986-05-30

1987-11-10

Cangialosi, Salvatore

Cryptography

Communication system using cryptography

Wireless communication

380 46, 375 10, H04L 900

Patent

active

047062860

ABSTRACT:
A method and apparatus for detecting and identifying Doppler frequency and phase information contained within a signal of the direct sequence spread spectrum type. An incoming signal is split by a circuit and component parts mixed with first and second local oscillator signals, the frequency of the first local oscillator being less than that of the carrier and the second being greater than that of the carrier by the same amount, plus an amount equal to twice the maximum Doppler frequency shift. The heterodyned signals are then low pass filtered, mixed with each other to form a heterodyned output that is then low pass filtered. The resultant signal retains Doppler phase and frequency information and is independent of carrier frequency and modulating PN-code thereby providing an easily demodulated signal whose Doppler information may be readily identified.

REFERENCES:
patent: 3906204 (1975-09-01), Rigdon et al.
patent: 4119926 (1978-10-01), Frosch et al.
patent: 4221005 (1980-09-01), LaFlame
patent: 4285060 (1981-08-01), Cobb et al.
patent: 4490829 (1984-12-01), Van Etten
"The Origins of Spread-Spectrum Communications" by Robert A. Scholtz, vol. COM-30, #5, May 1982, IEE Trans. on Comm.

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