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中文摘要：
针对合成孔径雷达地面动目标显示（SAR-GMTI）系统中动目标径向速度估计存在模糊的问题，提出了基于双通道两视干涉相位差实现无模糊估计径向速度的方法。该方法在距离频率域构造两视数据，将不同通道数据做干涉处理以得到两视数据的干涉相位。两视数据的干涉相位差不存在缠绕问题，可以用来无模糊地估计径向速度。理论推导证明，所提方法有效提高了最大不模糊速度。文中着重分析了两视数据距离频率间隔对径向速度估计性能的影响。通过仿真和实测数据处理验证了所提方法。
英文摘要：
Based on dual-channel two-look interferometric phase difference , a new method is proposed to estimate the radial velocity of a moving target unambiguously in the synthetic aperture radar/ground moving target indication （ SAR/GM TI） system . The two-look data is constructed in the range frequency domain , and interferometric phases of two-look are obtained by interferometry between the data of different channels . Since the interferometric phase difference of the two-look is not wrapped , the proposed method can be used to estimate the radial velocity of a moving target unambiguously . And the maximum unambiguous radial velocity is effectively improved by the proposed method . The effect on radial velocity estimation by the interval of the two-look data in range frequency is focused . Numerical and real data are processed to demonstrate the effectiveness of the proposed method .
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