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Lossy predictive coding of SAR raw data
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DOI：10.1109/TGRS.2003.811556.png)
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摘要
En 中文
In this paper, we propose to employ predictive coding for lossy compression of synthetic aperture radar (SAR) raw data. We exploit the known result that a blockwise normalized SAR raw signal is a Gaussian stationary process in order to design an optimal decorrelator for, this signal. We show that, due to the statistical properties of the SAR signa, 1, an along-range linear predictor With few, taps is able to effectively capture most of the raw signal correlation. The proposed predictive coding algorithm, which performs. quantization of the prediction error, optionally followed by entropy coding, exhibits a number of advantages, and notably an interesting performance/complexity trade-off, with respect to other techniques such as flexible block adaptive quantization (FBAQ) or methods. based on transform-coding; fractional output bit-rates can, also be achieved in the entropy-constrained mode. Simulation results on real-world SIR-C/X-SAR as well as simulated raw and image data show that the proposed algorithm outperforms FBAQ as to SNR, at a computational cost compatible with modern SAR systems.
Keyword:
differential pulse code modulation (DPCM)
entropy coding
entropy-constrained quantization
predictive coding
synthetic aperture radar (SAR) raw data compression
期刊
IF:
8.6
论文数:
2.1W
被引数:
10.7W
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分享收藏Compression of SAR raw data through range focusing and variable-rate trellis-coded quantization
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