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| Apply Super-SVA to Processing Stepped Frequency Chirp Signal with Bandwidth Gaps |
| Zhai Wen-shuai; Zhang Yun-hua |
| Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Stepped Frequency Chirp Signal (SFCS) is one of usually used signals in high-resolution radar. It is a combination of chirp signal and stepped frequency continuous waveform, and has advantages of the both signals. In the design of real radar system, if the frequency step (?f) can be larger than the bandwidth of sub-chirp (Bm), then it will be very helpful for using less number of sub-chirps to obtain larger bandwidth and reducing the influence of target motion on the quality of synthesized signal. However there will have high grating lobes in range profile when ?f > Bm if without further processing. Here an algorithm is proposed by using Super-SVA to extrapolate the bandwidth of each sub-chirp so as to fulfill the bandwidth gaps between sub-chirps and efficiently eliminate grating lobes. Super-SVA is also applied to the synthesized range profile, then the sidelobes can be further depressed. The simulation results verify the effectiveness of the proposed algorithm.
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Received: 09 March 2008
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2009, Vol. 31 
