Pipelined digital SAR azimuth correlator using hybrid FFT/transv

Details Pipelined digital SAR azimuth correlator using hybrid FFT/transv Pipelined digital SAR azimuth correlator using hybrid FFT/transv

1981-10-26

1984-09-11

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5FT, 343 5DP, G01S 900

Patent

active

044713576

ABSTRACT:
A synthetic aperture radar system (SAR) having a range correlator (10) is provided with a hybrid azimuth correlator (12) for correlation utilizing a block-pipelined Fast Fourier Transform (12a) having a predetermined FFT transform size with delay elements (Z) for so delaying SAR range correlated data as to embed in the Fourier transform operation a corner-turning function as the range correlated SAR data is converted from the time domain to a frequency domain. A transversal filter (12b) connected to receive the SAR data in the frequency domain, and from a generator (14b) a range migration compensation function, D, to a programmable shift register (30) for accurate range migration compensation; weights, W.sub.i, to multipliers (35-38) for interpolation, and an azimuth reference function, .phi..sub.j, in the frequency domain to a multiplier 42 for correlation of the SAR data. Following the transversal filter is a block-pipelined inverse FFT (12c) used to restore azimuth correlated data in the frequency domain to the time domain for imaging. The FFT transform size is selected to accommodate the different SAR azimuth aperture lengths, number of looks and prefiltering requirements.

REFERENCES:
patent: 4003054 (1977-01-01), Goldstone
patent: 4034370 (1977-07-01), Mims
patent: 4045795 (1977-08-01), Fletcher et al.
patent: 4132989 (1979-01-01), Arens
patent: 4292634 (1981-09-01), Wu et al.
patent: 4298950 (1981-11-01), Smith, Jr.
patent: 4355311 (1982-10-01), Jam
Lawrence R. Rabiner & Bernard Gold, Theory and Application of Digital Signal Processing Prentice Hall 1975 Chapter 6 pp. 356-437.

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