基于Wigner-Hough变换和中值滤波的加速度估计

当雷达发射脉冲个数比较少、噪声方差比较大时,单独使用Wigner-Hough变换(WHT)估计目标径向加速度时会有较大的误差,针对这一问题提出一种Wigner-Hough变换和中值滤波相结合的估计加速度方法,首先研究了相参脉冲回波信号Wigner-Ville分布(WVD)特点,讨论了谱峰位置与瞬时频率的关系,然后采用Hough变换和中值滤波方法时Wigner-Ville分布(WVD)峰值信息进行处理来提取信号的调频率,最后根据加速度估计公式估计出目标加速度,最后进行了仿真验证,在不同积累脉冲个数和信噪比条件下证明了该算法的有效性.

Acceleration Estimation Based on Wigner-Hough Transformation and Mid-Value Filter

When the number of radar transmitting pulses is few and the noise variance is big, the big error of acceleration estimation is obtained only based on WHT. Aiming at this problem, the method of acceleration estimation is proposed based on Wigner-Hough transformation（WHT） and mid-value filter in coherent pulse train. The characteristic of WVD in radar coherent pulse echo is analyzed and the relation between peak position and instantaneous frequency is discussed. Then the rate of frequency modulation is estimated based on Hough transformation and mid-value filter. At last, the acceleration is obtained according to the formula of acceleration estimation. The feasibility of this method is proved with different pulse numbers and signal to noise ratios（SNR）.