Direct sequence spread spectrum direction finder

Details Direct sequence spread spectrum direction finder Direct sequence spread spectrum direction finder

1994-05-04

1995-11-07

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

G01S 504

Patent

active

054650976

ABSTRACT:
A direction finding apparatus for detecting and locating transmitters of direct sequence spread spectrum signals has two antenna spaced apart horizontally which are connected to a tuner that is under the control of a microcomputer. The tuner bandpass filters signals in separate channels for each antenna, amplifies and converts those signals to an intermediate frequency. That intermediate frequency signal in each channel is applied to a nonlinear device to produce discrete spectral components which are applied to a bandpass filter in order to isolate a discrete spectral component in one channel and a similar component in the other channel. Each selected discrete spectral component is then digitized in A/D converters and applied to the microcomputer which determines the frequency of the spectral component and the phase difference between channels. The microcomputer can then determine an angle-of-arrival of a received signal, with respect to a baseline between the antenna, from that phase difference, the frequency and the known spacing between the antenna.

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patent: 5255000 (1993-09-01), Puzzo
patent: 5265121 (1993-11-01), Stewart
Norman F. Krasner, "Optimal Detection of Digitally Modulated Signals"; May 1992; vol. Com-30, No.5; pp. 885-895; Published in the IEEE Transactions on Communications.
William A. Gardner, "Signal Interception: A Unifying Theoretical Frame-work for Feature Detection". Aug. 1988; pp. 897-906; published in IEEE Transactions on Communications, vol. 36, No. 8.
John Kuehls et al., "Presence Detection of Binary-Phase-Shift-Keyed and Direct-Sequence Spread-Spectrum Signals Using . . . "; Jun. 1990, pp. 914-933; published in the IEEE Journal on Selected Areas in Comm., vol. 8, No. 5.

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