论文部分内容阅读
针对步进频多发多收合成孔径雷达通道间存在相位误差影响距离带宽合成的问题，本文提出了一种基于回波数据的通道误差估计的两步处理方法。首先，提出一种距离向相位调整的对比度增强算法来估计子带内高阶相位误差，通过补偿得到聚焦的子带信号；接着，对子带信号进行上采样和频谱移动，建立了一种旁瓣平衡模型，并推导得到旁瓣偏离率和常数相位误差的关系表达式，将实测数据的旁瓣偏离率代入便可计算得到通道间的常数相位误差。通过以上两步估计补偿后，在频率域完成步进频信号带宽合成，实现分辨率的提升。最后，对实测数据进行处理，得到 0.06 米的距离分辨率，并对补偿前后 SAR成像结果进行对比分析，验证了该方法的正确性和高效性。
Aiming at the problem that the phase error affects the synthesis of distance bandwidth, the step-by-step multiple-output multi-aperture synthetic aperture radar channel is proposed. This paper presents a two-step processing method of channel error estimation based on echo data. Firstly, a phase-adjusted contrast enhancement algorithm is proposed to estimate the high-order phase error in the sub-band and get the focused sub-band signal by compensation. Then, the sub-band signal is upsampled and shifted spectrum, The equilibrium model of the valve is obtained and the expression of the relationship between the sidelobe deviation rate and the constant phase error is deduced. By substituting the sidelobe deviation ratio of the measured data, the constant phase error between the channels can be calculated. After the above two steps are estimated and compensated, the bandwidth synthesis of the step frequency signal is completed in the frequency domain, and the resolution is improved. Finally, the measured data are processed to get the distance resolution of 0.06 meters, and the SAR imaging results before and after compensation are compared and analyzed, which verifies the correctness and efficiency of the method.