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对调频连续波(FMCW)合成孔径雷达(SAR)地面运动目标的参数估计方法进行了研究,采用相位中心偏置天线(DPCA)技术对地杂波进行抑制,分析了载机及地面运动目标连续运动对回波信号的影响,推导了采用DPCA技术引入的回波慢时间包络(STE)项与地面运动目标参数之间的关系。在此基础上,提出了一种地面运动目标谱图域参数估计方法,该方法首先利用Radon变换在谱图域估计导致回波信号距离走动的目标等效径向速度,并对距离走动进行校正;其次,在谱图域中提取运动目标回波幅度,根据STE项引起的回波幅度变化与目标方位向速度之间的关系,估计目标的方位向速度,并进一步求解相应的目标径向速度。所提方法能够在谱图域完成地面运动目标二维速度估计,最后的仿真实验验证了所提方法的有效性和可行性。
The parameter estimation method of the ground moving target of the frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR) is studied, and the ground clutter is suppressed by the phase center bias antenna (DPCA) technology. Motion on the echo signal, the relationship between the term Echo Delay Envelope (STE) introduced by DPCA and the ground moving target parameters is deduced. On this basis, a parameter estimation method of ground motion target spectral domain is proposed. In this method, Radon transform is used to estimate the target equivalent radial velocity that leads to the echo signal moving in the spectral domain and the distance walk is corrected Secondly, the amplitude of the moving target echo is extracted in the spectral domain, and the azimuth velocity of the target is estimated according to the relationship between the amplitude of the echo caused by the STE entry and the target azimuth velocity, and the corresponding target radial velocity is further solved . The proposed method can accomplish two-dimensional velocity estimation of ground moving targets in the spectral domain. The final simulation results verify the effectiveness and feasibility of the proposed method.