Processing method using an advanced waveform for unlocked cohere

Details Processing method using an advanced waveform for unlocked cohere Processing method using an advanced waveform for unlocked cohere

1998-05-22

1999-09-28

Lobo, Ian J.

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

Return signal controls radar system

Receiver

342195, 342 95, G01S 1366

Patent

active

059595736

ABSTRACT:
A bistatic coherent unlocked radar system and processing method using an advanced waveform that permits bistatic unlocked coherent operation of an unlocked radar transmitter and receiver. The waveform implements intrapulse fine range resolution, pulse to pulse coherency and burst to burst frequency agility to provide for enhanced target detection and robust operation in electronic countermeasure environments. A continuous sequence of pulses at different frequencies is transmitted that may contain an acquisition frequency that is revisited) more times than the other frequencies. Energy reflected from a target is processed to detect energy at the acquisition frequency, for example, over a plurality of range bins and predetermined pulse repetition intervals. A range pattern is generated if the detected energy is above a predetermined threshold. The energy is centroided to indicate the relative angle to the target. The transmitted frequencies contained in the pattern of energy are identified. The receiver then frequency hops with the transmitter. The energy is coherently processed using Fourier transforms to determine the center in the pattern, which pattern center is indicative of the direction to the target.

REFERENCES:
patent: 3825928 (1974-07-01), Williams
patent: 4644356 (1987-02-01), Yamano
patent: 5115246 (1992-05-01), Thomas, Jr. et al.
patent: 5736956 (1998-04-01), Kennedy et al.

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