基于多波束阵列天线的目标快速捕获方法

摘要

航天器在高动态下，需要宽波束来保证目标角度捕获概率，但目标的微弱信号需要高增益、窄波束的天线去接收，随之而来的是对高动态微弱信号目标的快速捕获问题。针对该问题，提出了基于多波束阵列天线的目标快速捕获的方法。它既可以采用多波束解决宽视场覆盖问题，又可以兼顾波束的高增益特性，通过研究多波束快速扫描、多通道能量检测等关键技术解决了低信噪比下的高动态信号检测和角度捕获跟踪。仿真结果表明，该方法可以完成对高动态、弱信号目标的快速捕获。%When spacecrafts are in high dynamic situations,wide beams are needed to guarantee the acquisition probability.How⁃ever,antennas with high gain and narrow beam are necessary to receive the weak signals of target,along with which comes the issue of fast acquisition of high dynamic and weak signal target.To solve this problem,a target fast acquisition method based on multi⁃beam array antenna is proposed,which can not only realize wide coverage field of view with multi⁃beam,but also guarantee the high gain of beam. High dynamic signal detection and angle acquisition and tracking under low signal to noise ratio are addressed by exploring key technol⁃ogies including quick scanning based on multi⁃beam array antenna and multi⁃channel signal detection.Simulation results show that it is feasible to realize fast acquisition of high dynamic and weak signal target by this method.