利用頻譜合成實現(xiàn)分布式SAR高分辨力成像
Distributed Satellites SAR High Resolution Imaging via Spectral Synthesis
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摘要: 該文主要研究了利用頻譜合成實現(xiàn)分布式SAR高分辨力成像的方法。在分布式SAR系統(tǒng)中，不同衛(wèi)星對同一地域觀測時，其距離向頻譜及方位向頻譜均具有一定的相對頻譜偏移。利用該頻譜偏移進(jìn)行頻譜合成形成較寬的距離向頻譜及方位向頻譜，從而提高系統(tǒng)的距離向分辨力及方位向分辨力。在頻譜合成過程中可首先利用INSAR技術(shù)估計出多幅圖像的相位差，再利用該相位差進(jìn)行相位校正、圖像合成即可形成具有較高分辨率的圖像。該文對這一方法進(jìn)行了理論分析，并給出了仿真結(jié)果。
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關(guān)鍵詞:
- 分布式衛(wèi)星;合成孔徑雷達(dá)(SAR);高分辨力成像
Abstract: In this paper, a distributed satellites SAR high resolution imaging method based on spectral synthesis is introduced. In distributed satellites SAR system, the scattering spectrums relative to the same scene acquired by different satellites have spectrum shifts in both range and azimuth directions, when join these shifted spectrums to a wider range and azimuth spectrum, a higher range and azimuth resolution can be acquired. In the processing, InSAR technique can be used to estimate the phase difference of the images. And after phase correction procedure, image combination procedure has been done, a higher resolution image both in range and azimuth direction would be generated. In this paper a theoretical analysis of this method is given, and the simulation results are also provided. -
張冰塵, 王巖飛. 空間虛擬微波成像雷達(dá)系統(tǒng)技術(shù)總結(jié)報告. 中國科學(xué)院電子學(xué)研究所研究報告, 中國科學(xué)院電子學(xué)研究所, 2004.[2]Goodman N, Stiles J. Resolution and synthetic aperture characterization of sparse radar arrays[J].IEEE Trans. on Aerospace and Electronics System.2003, 39(3):921-[3]Goodman N, Lin S, et al.. Processing of multiple-receiver spaceborne arrays for wide-area SAR. IEEE Trans. on Geoscience and Remote Sensing, 2002, 40(4): 841852. .[4]Massonnet D. The interferometric cartwheel, a constellation of low cost receiving satellite to produce radar images that can be coherently combined[J].International Journal of Remote Sensing.2001, 22(2):2413-[5]Massonnet D. Capabilities and limitation of the interferometric cartwheel[J].IEEE Trans. on Geoscience And Remote Sensing.2001, 39(3):506-[6]林來興. 微小衛(wèi)星編隊飛行組成虛擬衛(wèi)星研究. 微小衛(wèi)星編隊飛行及應(yīng)用論文集, 北京, 2000.7: 135. .[7]Li F K, Goldstein R M. Studies of multibaseline spaceborne interferometric synthetic aperture radars. IEEE Trans. on Geoscience and Remotre Sensing, 1990, 28(1): 8896. .[8]Prati C, Rocca F. Improving slant-range resolution with multiple SAR surveys. IEEE Trans. on Geoscience Remote Sensing, 1993, 29(1): 135.143.[9]Gatelli F, Guarnieri A M, et al.. The wavenumber shift in SAR interferometry[J].IEEE Trans. on Geoscience, and Remote Sensing.1994, 32(4):855- -
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