Signal analysis receiver with acousto-optic delay lines

Details Signal analysis receiver with acousto-optic delay lines Signal analysis receiver with acousto-optic delay lines

1985-06-10

1987-02-17

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

350356, 350358, 332 751, G01R 2316

Patent

active

046442677

ABSTRACT:
The system makes use of an interferometric Bragg cell for the time delays needed by the multiple antenna inputs in an angle-of-arrival (AOA) measurement system, for accurate measurements over wide bandwidths. A signal Bragg cell is modulated with a selected band of the EW signal environment, using a separate transducer coupled to each quadrant antenna element. A reference Bragg cell is modulated with a chirp signal. Coherent light from a laser is split and directed to both the signal cell and the reference cell. The output light beams from the reference Bragg cell and signal Bragg cell are combined and focused onto photo detectors having a one-dimensional array for each quadrant antenna element. The reference and signals are heterodyned at the photo detectors, which results in a channelized spectral output with each channel at the same intermediate frequency (IF). The outputs of the photodetectors are used by a phase comparison unit, cued by a frequency measurement receiver to the correct detectors, to provide the AOA measurement.

REFERENCES:
patent: 3943464 (1976-03-01), Brienza et al.
patent: 3962657 (1976-06-01), Redman
patent: 4326778 (1982-04-01), Berg et al.
patent: 4390247 (1983-06-01), Freyre
patent: 4421388 (1983-12-01), Berg et al.
patent: 4443066 (1984-04-01), Freyre
patent: 4468084 (1984-08-01), Lynn

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