基于去調(diào)頻寬帶LFM信號(hào)的二次距離壓縮算法及其實(shí)時(shí)實(shí)現(xiàn)
SRC Imaging Method of De-chirped Broadband LFM Signal and Its Real Time Implementation
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摘要: 該文在基于匹配濾波的二次距離壓縮算法(SRC)基礎(chǔ)上，通過(guò)對(duì)去調(diào)頻的線性調(diào)頻(LFM)信號(hào)的時(shí)、頻域關(guān)系的分析，給出基于去調(diào)頻LFM信號(hào)的SRC算法，與距離多普勒算法(RD)和普通LFM信號(hào)SRC算法對(duì)比，分析該算法的運(yùn)算量，說(shuō)明該算法適合于去調(diào)頻體制SAR實(shí)時(shí)成像處理。對(duì)于去調(diào)頻SAR數(shù)據(jù)采用該算法壓縮得到清晰的圖像，同時(shí)對(duì)比斜視下SRC與RD成像的結(jié)果。驗(yàn)證了在高分辨率實(shí)時(shí)成像時(shí)SRC算法優(yōu)于RD算法。Abstract: Based on the analysis of the time and frequency domain character of the de-chirped broadband LFM signal, this paper presents the SRC imaging method of S AR with de-chirped LFM signal. In comparison with the RD and SRC method of normal LFM signal with the same swath and resolution, this method is proved suitable for real time processing with a decrease of data to be processed and a little amount of calculation increased. Data collected in de-chirp LFM SAR system is formed into images with this method and demonstrates it is better than RD to form fine-resolution images when there exits a squint angle in SAR system, which is usually the case in reality.
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Jin Y, Wu Chialin. A SAR correlation algorithm which accommodates large-range migration.IEEE Trans. on Geosci. Remote Sensing, 1984, 22(6): 592-597.[2]Wu Chialin, Liu K Y, Jin Michael. Modeling and a correlation algorithm for spaceborne SAR signals[J].IEEE Trans. on Aerospace andElectronic Systems.1982, 18(5):563-575[3]Raney R K, Runge H, Bamler R, Cumming Ian G, Wong F H. Precision SAR processing using chirp sacling[J].IEEE Trans. Geosci. Remote Sensing.1994, 32(4):786-798[4]Curlander J C.[J].McDonough R N. Synthetic Aperture Radar Systems and Signal Processing. New York, John Wiley Sons.1991,:-[5]Bennett J R, Cumming I G, Deane R A. The digital processing of Seasat synthetic aperture radar data. IEEE International Radar Conference, Washington, DC., 1980: 168-175.Wu Chialin. A digital fast correlation approach to produce Seasat SAR imagery. IEEE International Radar Conference, Washington, DC., 1980: 183-189.[6]Carrara W G, Goodman R S, Majewski R M. Spotlight Synthetic Aperture Radar Signal Processing Algorithms. Boston, Artech House, 1995: 27-30, 501-506.[7]Oppenheim A V, Willsky A S, Nawab S H. Signals Systems. Prentice-Hall International, Inc.,1998: 284-400. -
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