摘要
针对频率步进雷达对高速目标进行距离成像的问题,提出了一种基于时域二维复相关的运动补偿新方法,以克服回波包络剧烈走动对运动补偿性能的影响,并进一步扩大速度估计的不模糊范围以适应高速条件。该方法利用二维快速逆傅里叶变换(IFFT)获取相关函数,从而在高、低分辨维同时实现目标速度估计,运算量不高,抗噪性能好。针对低重频频率步进雷达,仿真对比了典型方法在不同速度和信噪比条件下的性能,验证了文中所提方法的有效性。
For range profiling of high speed targets in stepped frequency radar, a novel motion compensation method based on time-domaln two-dimensional complex correlation is proposed, which not only corn pensates the performance loss of motion compensation caused by serious envelop shifts of echo pulses, but also enlarges the unambiguous extent of velocity estimation greatly to satisfy the high speed condition. This method utilizes two-dimensional IFFT to obtain the correlation function and realize target velocity estimation in both high and low resolution dimensions. Therefore it has a low computation cost and performs robustly in noise. For low pulse repetition frequency（PRF） stepped frequency radar, statistical performance of typical methods in both different velocities and different signal-to-noise ratios is simulated and compared, and the resuits proves the validity of the method proposed in this paper.
出处
《雷达科学与技术》
2010年第2期151-158,共8页
Radar Science and Technology
关键词
频率步进雷达
高速目标
距离像
运动补偿
stepped frequency radar
high speed moving target
range profile
motion compensation
