基于二次速度估计的距离像运动补偿

为解决频率步进雷达高分辨距离像的运动补偿问题，推导了其成像原理，分析了运动目标的回波相位特性，提出一种基于二次速度估计的距离像补偿算法。首先对回波信号的互相关函数进行快速傅里叶变换(FFT)以获得速度、距离粗估计值，其次采用基于谱包络最小波形熵的修正离散Chirp-Fourier变换(MDCFT)在合理区间内进行参数的精确估计，最后分析其补偿性能。该算法通过对回波互相关函数进行FFT为MDCFT缩小参数搜索区间，将极大简化计算。仿真结果证明了该算法的可行性与有效性。

Motion Compensation of Range Profile Based on Second Velocity Estimation

In order to solve the motion compensation problem in high resolution range profile (HRRP) of frequency stepped radar, a HRRP motion compensation algorithm based on second velocity estimation is proposed after deducing its imaging principle and analyzing the characteristics of the echo phase of moving target. Firstly, the cross-correlation function of the echo signal is processed by fast Fourier transform to obtain rough estimates of velocity and distance. Then modified discrete Chirp-Fourier transform based on spectral envelope minimum waveform entropy is performed to do precise parameter estimation in the reasonable interval. Finally, the compensation performance is analyzed. The proposed algorithm narrows the search range for modified discrete Chirp-Fourier transform by performing FFT on the cross-correlation function of the echo, which will greatly simplify the calculation. The simulation results prove the feasibility and effectiveness of the proposed algorithm.