逆合成孔徑雷達(dá)成像中散射點走動的校正
COMPENSATION OF SCATTERERS MIGRATION IN ISAR IMAGING
-
摘要: 距離-多普勒算法是ISAR最常用的成像方法,它將目標(biāo)上的散射點按其距離和多普勒的二維分布形成目標(biāo)圖像。為了得到較高的多普勒分辨率,成像的觀測期間目標(biāo)必須有一定的轉(zhuǎn)角,即存在散射點走動,在分辨率要求較高的場合則會發(fā)生越分辨單元走動(MTRC),從而使成像點擴(kuò)展函數(shù)擴(kuò)散,分辨率下降。本文研究了散射點走動問題,并提出了一種簡單而有效的校正方法。計算機(jī)仿真和轉(zhuǎn)臺數(shù)據(jù)的校正結(jié)果表明,成像質(zhì)量得到明顯改善。
-
關(guān)鍵詞:
- ISAR成像; 越分辨單元走動; 越射點走動校正; 橫向定標(biāo)
Abstract: Range-Doppler method is the most common method in ISAR imaging. To obtain radar image of a target, certain angle of the target with respect to Radar Light Of Sight (RLOS) during the coherent integration interval is required. In some case, there will exist scatterers migration. Actually, scatterers Migration Through Resolution Cell (MTRC) occurs inevitably in higher resolution radar image, which will result in the point-spread function broadening and image resolution decreasing. The scatterers' migration is discussed in the paper and a simple and efficient method is proposed to compensate MTRC. Compensation results of the simulated data and the real data collected in a microwave anechoic chamber show that the resolution of the final radar image is improved. -
Dale A A, Adam K, Jack L W, Harrison MJ, Enrico C P. Developments in radar imaging. IEEE Trans. on AES, 1984, AES-20(4): 363-400.[2]Kong K K, Edwards J A. Polar format blurring in ISAR imaging. Electron. Lett. 1995, 31(17): 1502-1503.[3]Walter G C,RON S G, et al. Spotlight SAR Signal Processing Algorithms, Boston-London: Artech House, 1995, Chapter 3,4.[4]Wehner D R. High Resolution Radar, Second Edition, Boston-London: Artech House, 1995, Chapter 7.[5]Walker J L. Range-Doppler imaging of rotating objects. IEEE Trans. on AES, 1980, AES-16(1):[6]-52.[7]Brown W M,Fredricks R J. Range-Doppler imaging with motion through resolution cells, IEEE[8]Trans. on AES. 1969, AES-5(1): 98-102.[9]盧光躍,保錚.ISAR成像中MTRC校正算法性能分析西安電子科技大學(xué)學(xué)報,已錄用(待刊). -
計量
- 文章訪問數(shù): 2055
- HTML全文瀏覽量: 98
- PDF下載量: 475
- 被引次數(shù): 0
下載:
