基于空间目标特性的无缝搜索技术研究

为了解决常规雷达搜索屏拦截空间目标概率不高的问题,利用空间目标过境具有周期性的特征,提出一种高拦截率的无缝搜索方法。当搜索屏经度覆盖范围大于等于目标重访经度差时,目标过境将至少被搜索屏拦截1次。利用这个特征,通过优化相控阵雷达法线仰角和搜索波位的驻留时间改变搜索屏的空间和能量分布,使各个轨道高度处的搜索经度覆盖范围等于目标的重访经度差,从而在最小时间资源开销的条件下实现了空间目标高概率拦截搜索。仿真结果表明,在时间资源开销相同的条件下,提出的无缝搜索方法与常规搜索方法相比,可将空间目标平均拦截率由90.93%提升至99.94%。研究对于提升空间目标监视雷达搜索效率具有较高的应用价值。

Research of Seamless Search Technique Based on Space Object Characters

In order to solve the problem of low space object interception rate by use of common radar search fence, a high interception rate seamless search method is proposed on the basis of periodicity of transit. Space target can be intercepted by search fence at least once at transiting, when the longitude coverage of search fence is greater than or equal to the repeat longitude difference of the target. Based on this characteristic, by optimizing the antenna elevation angel and the dwell time of beam positions, the space and energy distributions of search fence are changed to make the longitude coverage equal to the repeat longitude difference of the space objects in each orbit height, so the high interception rate search is realized with the least time resource expenditure. Numerical simulations have shown that the proposed seamless search method can increase the mean interception rate from 90.93% to 99.94%, compared with the common search method under the condition of the same time resource expenditure. The research in this paper has the high application value in enhancing the search efficiency of space surveillance radars.