合成孔径雷达高度计高度估计算法研究

摘要

In this paper,the height estimation algorithm of synthetic aperture radar altimeter is re-searched.According to the echo model,the echo phase compensation function of the non-focused syn-thetic aperture processing method is derived,that eliminate the effect of the coupling phase on the dis-tance compression.The influence of pitch angle on the height estimation algorithm is eliminated by the method of doppler band center correction.The multiple look processing has been used to reduce the in-fluence of waves.The height estimation processing of synthetic aperture radar altimeter is given.Ac-cording to the process of the algorithm,the echo data of the lake obtained to captive flight testwas ana-lyzed and processed.Compared with the differential GPS height data,the height estimation results show that the echo spectral line is smooth and the energy is concentrated after the phase compensation and the multi-view processing method.The estimation accuracy meet the requirements,and the test results a-chieve the expected goal.%本文对合成孔径雷达高度计高度估计算法进行研究。根据回波模型，推导出非聚焦合成孔径处理方式的回波相位补偿函数，消除了耦合相位对距离压缩的影响；通过多普勒条带中心校正方法，消除了俯仰角对高度估计算法的影响；利用多视处理方法减小了海浪对测高精度的影响，给出了合成孔径雷达高度计高度估计流程，根据算法流程对挂飞试验获得的湖面回波数据进行了分析与处理，并与差分 GPS高度数据进行了对比。高度估计结果表明：经过相位补偿与多视处理方法后的回波谱线光滑且能量集中。估计精度满足高度计的要求，试验结果达到了预期目标。