SAR辐射定标的融合算法研究

针对机载SAR辐射定标外场试验可重复性较差的问题,提出了一种结合内场仿真信息进行辐射定标的参数估计新算法:首先建立机载SAR定标成像模型,在进行模型有效性检验之后,利用定标成像模型得到SAR线性动态范围内定标体RCS的渐进经验分布,然后结合定标试验实测数据进行辐射定标参数的融合估计。仿真表明该算法可以减小估计结果的误差方差,提高定标精度。

Research on fusion algorithm for the radiometric calibration of airborne synthetic aperture radar

A new estimation algorithm based on data fusion for radiometric calibration of airborne synthetic aperture radar is stud-iod in this paper.A mathematical model for the calibration of airborne synthetic aperture radar is set up and its validation is tested.Then a statistics of large numbers of synthetic aperture radar images is made for a certain kind of calibration sealer,and an empirical probabili-ty density function for its radar cross section is calculated.Then a fusion algorithm for the estimation of the scaler's radar cross section is studied,the accuracy of the estimation is improved in additive Gaussian noise while comparing with the least squares estimator and the weighted least squares estimator.Simulation is given to show the effectiveness of the method.