摘要
随着雷达反摧毁技术的发展,被动雷达导引头面临着在雷达和诱饵形成的不完全重合信号中进行超分辨测向的挑战,需要单快拍测向技术。现有测向技术大多假设信源数已知,而传统的信源数估计方法在单快拍时性能大幅下降甚至失效。为解决这一问题,提出了一种基于压缩感知的单快拍信源数估计方法。该方法首先将被动雷达导引头阵列测向模型稀疏表示,其次通过子空间算法和压缩感知算法相结合进行降阶和解相干处理,然后提出一种改进的正交匹配追踪算法,研究残差的变化规律,最后构造目标函数估计信源数。仿真实验表明,该方法在单快拍、阵元数少、信号相干的极端情况下估计成功率较高。
With the development of radar anti-destruction technology,passive radar seeker faces with challenge of super-resolution direction finding in incompletely overlapped signal caused by radar and decoys.In this situation,it needs single snapshot direction finding technology.Most existing technologies assume that the number of sources is known.However,the performance of traditional source number estimation algorithm declines sharply or even fails in single snapshot.To solve this problem,a source number estimation method for passive radar seeker based on compressed sensing is proposed.Firstly,sparse representation of array direction finding model for passive radar seeker is constructed.Then,degree reduction and decoherence by the combination of subspace algorithm and compressed sensing algorithm are processed.Finally,a improved orthogonal matching pursuit algorithm is proposed,that focuses on the variation of residuals and constructs objective function to estimate source number.Simulation results show the relatively high success rate of this estimation method in extreme cases of single snapshot,fewer array elements and coherent signal situation.
作者
王资
李槟槟
时满红
赵宏涛
江平
WANG Zi;LI Binbin;SHI Manhong;ZHAO Hongtao;JIANG Ping(Air Force Early Warning Academy,Wuhan Hubei 430019,China)
出处
《现代雷达》
CSCD
北大核心
2024年第1期8-15,共8页
Modern Radar
基金
国家自然科学资助项目(62001510)。
关键词
被动雷达导引头
信源数估计
压缩感知
单快拍
passive radar seeker
source number estimation
compressed sensing
single snapshot
