一种新的SAR自动增益控制的算法
A new algorithm for SAR automatic gain control
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摘要: 该文从合成孔径雷达(SAR)系统接收过程的信号模型出发,推导出了适用于SAR系统的理想的自动增益控制算法。通过对比理想的自动增益控制算法和目前通用的传统增益控制算法,发现它们各有利弊。该文根据工程实际,利用最大似然估值的方法,提出了一种能够发扬这两种方法的优点,并克服它们弊端的增益控制的新算法。经过计算机仿真,结果令人满意。
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关键词:
- SAR; 自动增益控制; 最大似然估值法
Abstract: This paper derives the ideal AGC(Automatic Gain Control) algorithm for SAR system from the statistical model of SAR echoes. Compared with the conventional algorithm, the two methods have both advantages and disadvantages. The conventional method is much more stable than the ideal one under the condition of low signal-to-noise ratio. But its gain and dynamical range are always much smaller than the practical needed one. This paper puts forward a new AGC algorithm using maximum likelihood estimation, which inherits all the virtues of the tow methods above and overcomes their drawbacks as well. The results are satisfactory via computer simulations. -
张光义,相控阵雷达系统,北京,国防工业出版社,1994,232-233.[2]G. Franceschetti, R. Lanari, Synthetic Aperture RADAR Processing, CRC Press Boca London.New York, Washington, D. C 1999, 44-47.[3]丁鹭飞,张平,雷达系统,西安,西北电讯工程学院出版社,1984,63-65.[4]沈凤麟,钱玉美,信号统计分析基础,合肥,中国科技大学出版社,1989,307-309.[5]Yoshiaki Nemoto, Hideo Nishino, Japanese earth resources satellite-1 synthetic aperture radar,Proc. of the IEEE, 1991, 79(6), 806-807. -
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