A hybrid radar waveform design technique for improving slant range resolution in a synthetic aperture radar system
Abstract
A 'hybrid' radar waveform design technique is presented for improving slant range resolution in a synthetic aperture radar system which is processor-bandwidth limited. The hybrid waveform consists of K repetitions of L complementary phase coded pulses with linearly increasing carrier frequency from repetition to repetition. Processing of this frequency stepped, phase coded waveform consists of matched filtering on a pulse-by-pulse basis followed by amplitude weighting and coherent summation. The 'composite' ambiguity function is determined and illustrated for the hybrid waveform. A method for selecting optimum amplitude weights based on a cost function related to the integrated sidelobe ratio of the compressed waveform is also presented. This is contrasted with the usual method of choosing a window function with a low peak sidelobe ratio. The results of a computer study are summarized in terms of the cost function, peak and integrated sidelobe ratios, and mainlobe spread ratio as functions of selected waveform parameters. A numerical example is then given which illustrates the improvement factor to be expected by using the hybrid waveform technique.
- Publication:
-
International Radar Conference
- Pub Date:
- 1985
- Bibcode:
- 1985inra.conf..391K
- Keywords:
-
- Design Analysis;
- Optimization;
- Radar Resolution;
- Sidelobe Reduction;
- Synthetic Aperture Radar;
- Waveforms;
- Bandwidth;
- Coding;
- Doppler Radar;
- Pulse Radar;
- Communications and Radar