Pipelined digital SAR azimuth correlator using hybrid FFT-transversal filter
Abstract
A synthetic aperture radar system (SAR) having a range correlator is provided with a hybrid azimuth correlator which utilizes a block-pipe-lined fast Fourier transform (FFT). The correlator has a predetermined FFT transform size with delay elements for delaying SAR range correlated data so 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. The azimuth correlator is comprised of a transversal filter to receive the SAR data in the frequency domain, a generator for range migration compensation and azimuth reference functions, and an azimuth reference multiplier for correlation of the SAR data. Following the transversal filter is a block-pipelined inverse FFT used to restore azimuth correlated data in the frequency domain to the time domain for imaging.
- Publication:
-
National Aeronautics and Space Administration Report
- Pub Date:
- September 1984
- Bibcode:
- 1984nasa.reptT....W
- Keywords:
-
- Central Processing Units;
- Digital Techniques;
- Fast Fourier Transformations;
- Pipelining (Computers);
- Real Time Operation;
- Signal Processing;
- Synthetic Aperture Radar;
- Azimuth;
- Data Correlation;
- High Resolution;
- Patents;
- Radar Filters;
- Radar Imagery;
- Transmitter Receivers;
- Communications and Radar