一种高精度窄带相推测距方法

本文通过研究雷达回波信号特性,分析窄带信号相位信息,利用常规处理获得的速度和距离粗估计值辅助相推测速测距实现解模糊,获得高精度的速度值和距离变化值。采用游标测距方式实现窄带雷达跟踪目标距离估计,并通过宽窄带结合或包络估计距离样本处理等方式提高基准距离精度,从而利用窄带相推测距技术实现目标距离高精度测量。该方法在窄带跟踪雷达适用性强,对提高低频段雷达距离测量精度效果明显,在米波雷达试验中表明其相对精度比传统包络测距精度提高两个数量级。

A Method of High Precision Narrowband Phase Derived Range

The signatures of radar echoes are studied and the phase information of narrow signal is analyzed in this paper. The coarse velocity and range estimated values obtained by conventional processing are used to assist the phase derived range with ambiguity resolution for achieving high precision velocity and range varying values. The range vernier is used to gain the range estimated value of the target tracked by narrowband radar and the reference range precision is improved by wideband and narrowband combination or envelope estimate range sample processing. Then the narrowband phase derived range technique is used to realize high precision measurement of target. The method is applicable to the narrowband tracking radar and has an obvious effect on the range measurement precision of low frequency band radar . It is shown by metric-wave radar trials that the relative precision of the proposed method is higher than the traditional envelope ranging precision by two orders of magnitude.