低信噪比压缩感知雷达阵列的空时压缩积累观测矩阵设计研究

项目名称： 低信噪比压缩感知雷达阵列的空时压缩积累观测矩阵设计研究

项目编号： No.61471191

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 张弓

作者单位： 南京航空航天大学

项目金额： 74万元

中文摘要： 低信噪比重构是压缩感知雷达系统设计面临的一个重大挑战。本申请基于脉冲体制的压缩感知阵列雷达框架，研究压缩感知雷达阵列的空时信号压缩积累以提高低信噪比压缩感知雷达重构性能。（1）构建压缩感知雷达阵列空时回波信号群的高维联合稀疏表示模型，设计回波数据切片方式和排列准则；（2）提出针对回波信号群的联合压缩积累观测矩阵设计准则：①基于多脉冲体制，设计对抗目标距离徙动的脉冲压缩积累观测矩阵，在对抗距离走动同时完成时域压缩积累；②基于阵列多通道体制，提出基于感知矩阵等距同构、波束指向、通道压缩率的多约束优化条件，设计指向可调的通道压缩积累观测矩阵，在空域压缩积累的同时实现阵列波束的指向可调。本申请项目旨在通过空时压缩积累观测矩阵设计，同时实现压缩处理数据量和空时积累（即空时压缩积累），为低信噪比情况下的压缩感知雷达目标探测提供理论与技术支持，并基于压缩感知雷达系统平台验证其有效性。

中文关键词： 压缩感知雷达；空时压缩积累；观测矩阵设计；低信噪比；雷达系统设计

英文摘要： Low SNR ( Signal to Noise Ratio ) is a major challenge for designing the compressed sensing radar system. By the platform of compressed sensing radar system, this project researches space-time signal compressive accumulation of compressed sensing radar array based on the framework of array multi-pulse system of compressed sensing radar. The high-dimensional joint sparse representation model of space-time high-dimensional echo signals for compressed sensing radar array is constructed. The criteria of designing joint accumulated measurement matrix for high-dimensional echo signals is presented. Base on multi-pulse echo system, pulse accumulated measurement matrix against the targets' range migration is designed, realizing time-domain compressive accumulation while against the range migration. Based on array multi-channel system, the multiple constrained optimization conditions which is based on sensing matrix's isometric isomorphism, beam-pointing and channel compression rate is proposed. Adjustable pointing channel compressive accumulated measurement matrix is designed, and the beam-pointing can be adjusted while spatial domain compressive accumulation was done. This project aim to complete space-time accumulation while compressing the amount of data by designing the compressive accumulation matrix. The project provides methods for optimized detection of compressed sensing radar system, and the effectiveness can be verified on the platform of compressed sensing radar system.

英文关键词： Compressive sensing radar;Space-time compressive accumulation;Measurement matrix designing;Lower SNR;Radar system designing