合成孔徑雷達原始數(shù)據(jù)非線性量化壓縮頻譜分析
THE SPECTRAL ANALYSIS OF NON-LINEAR CODING COMPRESSED RAW DATA OF SYNTHETIC APERTURE RADAR
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摘要: 該文針對合成孔徑雷達原始數(shù)據(jù)的非線性量化壓縮,采用頻譜分析的方法探討了數(shù)據(jù)壓縮對雷達圖像分辨力指標的影響問題。從分析結果中可以看出,雷達原始數(shù)據(jù)經(jīng)過壓縮以后,信號的頻譜并沒有損失,相當于雷達圖像的分辨力并不降低;但數(shù)據(jù)壓縮會引入附加噪聲。該文還分析了非線性量化壓縮所產(chǎn)生的誤差的影響。Abstract: In this paper, a spectral analysis method is presented to assess the quality of Synthetic Aperture Radar(SAR) image whose raw data is non-linear coding compressed. Usually, it is assumed that the SAR raw data compression will result in the reduction of Signal to Noise Ratio(SNR), and the image quality is therefore degraded, but the resolution of image is not reduced. By means of the spectral analysis method in this paper, it is demonstrated the SAR data frequency spectrum is not reduced after the compression, and the SAR image resolution is retained. The effects of distortion resulted from the data compression is also analysed.
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