宽带LFM信号对干涉成像的影响及补偿方法

建立了基于线性调频信号脉冲压缩技术和双天线干涉技术的距离-干涉二维雷达成像模型;在论证成像理论和成像算法的过程中,突破传统仅用单频信号进行干涉成像理论推导的方法,将线性调频信号形式引入到干涉成像的公式推导中来;发现当线性调频信号不能视为窄带信号时,采用原有干涉成像法进行干涉测量时结果存在偏差;指出了这种偏差的理论来源,给出仿真结果,提出坐标参数估计自回归算法对此偏差进行补偿,得到了令人满意的补偿精度。

Impact of Wideband LFM Signal on Interferometric Imaging and Compensation Algorithm

Based on the technology of pulse compression of linear frequency-modulated signal and dual antenna interferometric imaging,the model of range-interferometric 2D radar imaging was proposed.The traditional demonstration of interferometric imaging theory was broken with only mono-frequency signal when the imaging theory and algorithm were analyzed,and the linear frequency-modulated signal was induced into interferometric imaging equation demonstration;it was discovered when the situation linear frequency-modulated signal could not be considered as narrowband signal,the deflection of primary interferometric imaging results occurred;the theory original cause of this deflection was indicated,and the simulation results were shown,and then a method of coordinate parameter estimate self-regression algorithm was proposed to compensate this deflection.Finally,the satisfactory compensate precision was achieved.