大斜視SAR成像的一種新的二維可分離處理方法
A New Two-Dimension-Separated Approach to High Squint SAR Processing
-
摘要: 大斜視角下SAR信號(hào)的特點(diǎn)表現(xiàn)為大的距離走動(dòng)和小的距離彎曲，這使得采用橫距域距離走動(dòng)校正和二維可分離成像方法成為可能,但方位場(chǎng)景較大時(shí)要考慮方位向聚焦深度的限制。該文采用非線性調(diào)頻變標(biāo)的方法補(bǔ)償方位向調(diào)頻率隨目標(biāo)橫距的變化，得到了良好的結(jié)果。
-
關(guān)鍵詞:
- 大斜視SAR成像; 方位向聚焦深度; 非線性調(diào)頻變標(biāo)
Abstract: The high squint SAR signal features large range walk and small range curvature, which enable the raw data be compressed in range and azimuth separately. But in case of large azimuth scene size , complex algorithms must be used to cope with the constraint of the focus depth. In this paper a new two-dimension-separated method is presented to compensate the azimuth-dependent chirp rate using a non-linear chirp scaling operation. Finally simulation results are presented to verify the method. -
Jin M Y,Wu C.A SAR correlation alorithm which accomodates large range migration.IEEE Trans.on GRS,1984,22(6):592-597.[2]Wong F H.[J].Gumming IG. Error sensitivities of a secondary rangecompression algorithm for processing squinted satellite SAR data.Proc.IGARSS89, Vancouver.1989,:-Chang C Y.[J].Jin M, Curlander J C. Squint mode SAR processingalgorithms. Proc.IGARSS89, Vancouver.1989,:-[3]Smith A M. A new approach to range-Doppler SAR processing[J].Int. J. Remote Sensing.1991,12(2):235-[4]Runge H, Bamler R. Verfahren zur korrektur von range migrationbei einer bilderzeugung bei synthetischem apertur radar. DLRpatent application, July 8, 1991.[5]Davidson G W, Gumming I G, Ito M R. A chirp scaling approachfor processing squint mode SAR data. IEEE Trans, on AES, 1996,32(1): 121 - 133.[6]Jakowatz C V, et al. Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach, Boston: Kluwer Academic Publishers, 1996: chapter 3.[7]Tat Soon Yeo, Ngee Leng Tan, Cheng Bo Zhang, Yi Hui Lu. A new subaperture approach to high squit SAR processing.IEEE Trans.on GRS,2001,39(5):954-968.[8]徐永健,婁曉光,王貞松.拉格朗日乘子法在機(jī)載SAR成像系統(tǒng)降采樣濾波器設(shè)計(jì)中的應(yīng)用.電子學(xué)報(bào),2000,28(12):11-14. -
計(jì)量
- 文章訪問(wèn)數(shù): 2775
- HTML全文瀏覽量: 128
- PDF下載量: 811
- 被引次數(shù): 0
下載:
