带限条件下雷达信号的超分辨处理方法

Super-Resolution Method of Radar Signal Processing Under Limited Bandwidth

雷达的距离分辨率与发射信号的带宽成反比 ,要获得大的距离分辨率 ,必须发射宽带雷达信号。事实上 ,在雷达发射波形设计时 ,考虑到雷达的总体性能指标和工程上的可实现性 ,发射信号带宽是受限的。如何在有限带宽情况下提高距离分辨率是一个值得解决的技术难题。针对脉间频率步进雷达回波信号的特性 ,采用MUSIC(multiplesignalclassification)算法 ,实现了带限条件下雷达信号的超分辨处理 ,进一步提高了脉间频率步进雷达的距离分辨率。仿真实验证明了结果的正确性。

Radar range resolution is influenced by its bandwidth, in order to obtain high range resolution, radar must emit wideband waveform. In practice, considering radar integral features, radar's bandwidth is limited in engineering realization. It is a technical difficulty to improve range resolution under limited bandwidth. Pulse stepped frequency radar is studied. Although pulse stepped frequency radar could obtain large bandwidth in theory, its bandwidth might be limited in engineering practice. Super resolution method of radar signal processing under limited bandwidth is valuable. It is proved that the phase of pulse stepped radar echoes satisfied Pisarenko characteristics. MUSIC (multiple signal classification) algorithm is effective in Pisarenko signal classification. This algorithm is adopted to realize super-resolution under limited bandwidth. Experiment result corresponds with theoretical analysis.