摘要
目前利用相位差分法实现调频步进雷达测量目标径向速度的研究,针对目标相邻回波信号建立了模型,并利用回波信号的相位差分信息估算目标速度。首先对原算法所建信号模型和公式推导进行分析,论证了原算法在相位差分运算方面和测距误差评估方面的不足,然后提出一种在一级脉压后进行相位差分的改进算法。并进一步分析了测距误差对该算法得到的估计速度的影响,最后提出利用最小波形熵法减小估计速度误差的方法。通过仿真试验证明了该方法的有效性。
Presently,the velocity measurement in frequency stepped radar is based on phase differential algorithm.This article first analyses the original algorithm and proofs it＇s deficiency in calculation and error assessment.Then an improved algorithm calculating phase difference after compression is put forward.Futher the influence of its velocity estimation on the ranging error is analyzed.At last,the method to use least waveform entropy to reduce this influence is presented.Simulation results show its effectiveness.
出处
《雷达科学与技术》
2012年第2期170-173,共4页
Radar Science and Technology
关键词
改进相位差分法
测速
调频步进信号
最小波形熵
improved phase differential algorithm
velocity measurement
modulated frequency stepped signal
least waveform entropy
