H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/18 (2006.01) G01R 25/00 (2006.01) G01S 3/04 (2006.01)
Patent
CA 2108956
The disclosed system measures the phase relationship of first and second BPSK signals received at a pair of receiving antennas. The antennas are connected to respective first and second converting circuits which convert the received signals into first and second CW signals. Each CW signal is subjected to chirp-Z processing so as to convert the first and second CW signals into first and second chirp-Z transforms, which are narrow pulses. Then, the phase relationship of the first and second narrow pulses is detected, so as to thereby detect the phase relationship of the first and second received BPSK signals. That phase information can be used, for example, to calculate the angle-of-arrival (AOA) of the received BPSK signals. Advantageously, each converting circuit includes a series connection of a frequency-doubling circuit, a bandpass filter, and a circuit for dividing frequency by two, in that order. A switching arrangement is provided which is operable for applying the outputs of the converting circuits to the phase detecting circuit only when the received signals are BPSK signals.
Le système divulgué mesure la relation de phase du premier et du second signal BPSK reçus par une paire d'antennes de réception. Les antennes sont connectées à leurs premier et second circuits de conversion respectivement, qui convertissent les signaux reçus en premier et second signaux CW (ondes entretenues). Chaque signal CW est soumis à un traitement chirp-Z pour convertir les premier et second signaux CW en première et seconde transformées chirp-Z, qui sont des impulsions plus étroites. Ensuite, la relation de phase des premier et second signaux plus étroits est décelée afin de détecter la relation de phase des premier et second signaux BPSK. Cette information sur la phase peut servir, par exemple, à calculer l'angle d'arrivée (AOA) des signaux BPSK reçus. Chaque circuit de conversion comprend de préférence un circuit doubleur de fréquence, un filtre passe-bande et un circuit diviseur de la fréquence par deux, dans cet ordre. Un montage de commutation est fourni et ne s'active que pour appliquer les sorties des circuits de conversion au circuit de détection de la phase lorsque les signaux reçus sont des signaux BPSK.
Alevizakos Vasilios
Skudera William J. Jr.
Aspila Kalevi P.
Government Of The United States As Represented By The Secretary Of The Army(the)
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