MIMO雷达中正交离散频率编码波形的设计  

Orthogonal Discrete Frequency Coding Waveforms Design in MIMO Radar

作　　者：李敬军[1] 姜永华[1] 但波[1] 

机构地区：[1]海军航空工程学院电子工程系,山东烟台264001

出　　处：《信号处理》2013年第9期1176-1181,共6页Journal of Signal Processing

摘　　要：发射信号正交性能的好坏直接决定了多输入多输出(Multiple Input and Multiple Output,MIMO)雷达系统的性能。正交离散频率编码波形是一种较理想的准正交波形。首先给出了正交离散频率编码波形的模糊函数,然后以互相关能量为代价函数,运用改进的离散粒子群优化算法对正交离散频率编码波形进行优化排序设计,生成可应用于宽带MIMO雷达中的具有较好模糊特性的准正交信号。仿真结果验证了新算法的有效性,且随着码长的增加和编码排序的优化新的正交离散频率编码波形的互相关性能将变得更好,其对多普勒的容忍性与码长成反比,但是由于固有的特性其自相关性能与码长几乎无关。Abstract ： The orthogonal performance of the transmitted waveforms directly determines the capability of MIMO radar sys- tem. An ideal quasi-orthogonal waveform is orthogonal discrete frequency coding waveform （ODFCW）. The ambiguity function of orthogonal discrete frequency coding waveforms was analyzed firstly and the theory suggested that the perform- ance of ODFCW has related with the code length and coding order. In this paper, we used the cross-correlation energy as the cost function and applied the improved discrete particle swarm optimization （IDPSO） to design ODFCW. The proposed quasi-orthogonal ODFCW can be used in wideband MIMO radar and simulation results validate the effectiveness of the new algorithm, and with the increase in code length and the optimization of coding order, the cross-correlation level becomes lower, and Doppler tolerance is inversely proportional to code length. However, due to the inherent characteristics of ODF- CW, its autocorrelation has almost no relationship with the code length.

关 键 词：正交离散频率编码波形 改进的离散粒子群算法 模糊函数 优化排序 

分 类 号：TN958[电子电信—信号与信息处理]