The calibration factors of synthetic aperture radar ( SAR) images are generally obtained by estimation of radar system parameters. Based on the Rayleigh model of scattering coefficient, a simple but efficient estimator is proposed to estimate the calibration factors. Taking expectation and variance on the linear form of calibration equation, and describing scattering coefficient as the Rayleigh model, the estimator with analytical expressions is derived for the linear receiver and the square-law receiver. Monte Carlo simulations demonstrate that the proposed estimator on the basis of Rayleigh model of scattering coefficient has high estimation accuracy.%合成孔径雷达(SAR)图像的校正因子一般通过雷达系统参数的估计而获得.基于散射系数的Rayleigh模型,提出一种估计校正因子的简单而有效的方法.分别对线性形式的校正方程取均值和方差,并使用Rayleigh模型描述散射系数,针对线性检波器和平方率检波器,获得校正因子估计的解析表达式.Monte Carlo仿真表明基于散射系数Rayleigh模型的校正因子估计具有较高的估计精度.
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