Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1988-11-10
1990-10-30
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342189, 342195, G01S 1390, G01S 7295
Patent
active
049672002
ABSTRACT:
In a synthetic aperture radar system the radar pulse echo return signals are sample, which samples are correlated with a replica of the original signal to produce range line samples with increased resolution in the range direction. To increase resolution in the azimuth direction, a series of range lines are correlated or combined in some other way with Doppler or other reference-coefficents a problem with this is that there is relative movement between any particular point on the ground and the radar system, and the samples in the range lines corresponding to that position lie on a slant line such as 103 (skew axis y). To utilize the incoming data, the skew axis is arranged in a saw-tooth form. To facilitate processing data is fed into an input sequence of data storage location in for example a buffer 51, at a variable starting position which moves corresponding to each discontinuity in the zig-zag, so that the discontinuities are transparent to the processor. In one embodiment, azimuth processing can take place along columns in bands 83 in a two-dimensional memory 53 corresponding to swaths on the ground 101.
REFERENCES:
patent: 4219811 (1980-08-01), Herman et al.
patent: 4471357 (1984-09-01), Wu et al.
E. Shaw, "A Quick-Look SEASAT SAR Digital Processor" Instrumentation for Preprocessing of SAR Data to Image Form pp. 39-41, Sep. 1980. (TK 6592.595 E8 1979).
Barron Jr. Gilberto
The General Electric Company p.l.c.
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