利用時-頻分析進行合成孔徑雷達運動目標(biāo)成象的研究
A RESEARCH OF SAR MOVING TARGETS IMAGING BY JOINT TIME-FREQUENCY ANALYSIS
-
摘要: 本文研究了利用時-頻分析方法進行合成孔徑雷達運動目標(biāo)成象的若干問題。分析了三種時-頻變換方法短時傅里葉變換,小波變換和Wigner-Ville分布(WVD),提出只有WVD才能滿足要求。針對WVD的雙線性特性所造成的交叉項干擾問題,提出用Hough變換來抑制交叉項。實驗證明,即使在信噪比很低時,WVD和Hough變換結(jié)合的方法仍能提供很好的檢測性能。Abstract: Some probles about SAR moving targets imaging by joint time-frequency analysis are discussed in this paper.Three kinds of time-frequency transforms--Short Time Fourior Transform(STFT),Wavelet Transform(WT) and Wigner-Ville Distribution (WVD) are compared.It is presented that only WVD could meet the requirement.Moveover,Hough Transform(HT) is employed in restraining the distribing corss terms,rpoduced by the WVD due to its bilinear property.Experiments test that the combined WVD and HT could provide satisfactory detection performance even if the signal-to-noise rato is very low.
-
Freeman A, Currie A. A synthetic aperture radar and moving targets. GEC Journal of Research, 1987, 5(2): 106-115.[2]Barbarossa S, Zanalda A. A Conbined Wigner-Ville and Hough transform for crossterms suppression and optimal detection and parameter estimation, ICASSP92, Mar., 1992, San Francisco: 173-176.[3]劉貴忠,劉志梅.一種新的二次時頻分布和幾種主要二次時頻分布的比較研究.電子科學(xué)學(xué)刊,1996, 18(5): 455-461.[4]王韜.SAR運動目標(biāo)檢測、成象方法的研究:[碩士學(xué)位論文].北京:中國科學(xué)院電子學(xué)研究所,1995. -
計量
- 文章訪問數(shù): 2370
- HTML全文瀏覽量: 127
- PDF下載量: 392
- 被引次數(shù): 0
下載:
