星載SAR距離模糊分布規(guī)律及其改進設計
RANGE AMBIGUITY DISTRIBUTION CHARACTER- ISTIC OF SPACEBORNE SAR AND ITS DESIGN CONSIDERATION
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摘要: 本文提出了一種不加大天線尺寸而又使距離模糊滿足要求的新方法,它能夠在保持原有天線尺寸不增大的情況下實現(xiàn)寬測繪帶的高質量成象。這種方法采用交替發(fā)射線性調頻斜率完全相反的調頻信號,在對回波信號進行距離壓縮時,由于主要模糊區(qū)回波信號與參考函數失配就被大大地抑制,從而使距離模糊大大改善并得到較寬的測繪帶。Abstract: A new approach is proposed which can satisfy the range ambiguity requirement while keep the antenna width not to be enlarged and get the high quality image also. Here the chirp slope of the transmitted linear frequency modulated pulses is reversed alternately. Therefore, during the range compression significant portion of the ambiguous return is suppressed due to the mismatching with the signal reference function. The suggested method provides significant improvement in RAR and can be utilized in attaining wider swath.
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Bayna R W, Mclnnes P A. Apterure size anti ambiguity constraints for synthetic aperture radar, IEEE International Radar Conference, 1975, 499-504.[2]Li F K, Johnson W T K. IEEE Trans. on AES, 1983, AES-19(3): 389-397.[3]Barbarossa S.[J].Levriui G. An Antenna Pattern Synthesis Technique for Spaceborne SAR Performance Optimization, Proc. of 1GARSS87 Symposium, Ann Arbor.1987,:-[4]Mehlis J G. Synthetic Aperture Radar Range Azimuth Ambiguity Design and Constraints. IEEE International Radar Conference, 1980, 143-152.[5]Randy R K.[J].Prinez J. Reconsiderations of Azimuth Ambiguities in SAR. Proe. of IGARSS86, Symposiun, Zurich, Aug.1986,:-[6]Waller G. Antenna Ambiguity Investigations for X-SAR. Proc. of IGARSS86 Symposiun, Zurich, Ang. 1986, 1169-1173.[7]荊麟角.寬測繪帶低分辨率工作模式實施方案.中國科學院電子學研究所,863-308-01-01,1991年度科技報告.[8][8][9]荊麟角.星載合成孔徑雷達距離模糊分布規(guī)律、構成及抑制的新方法.中國科學院電子學研究所,863-308-01-01,1992年度科技報告. -
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