【摘要】 理论研究表明,MIMO(Multiple-Input Multiple-Output)雷达技术能在很大程度上提高雷达系统的探测性能,而多个发射波形之间相互正交是实现此种改善的重要因素。为了确保正交波形在高频地波雷达系统上成功应用,本文结合地波雷达收发共址的特点选择了四种典型的正交波形,包括上调频与下调频线性调频中断连续波、错开时间的调频中断连续波、离散频率编码波形和线性调频脉冲的离散频率编码波形,分析了其应用于高频雷达时的模糊特性和互区模糊特性。通过对比分析四种波形的特征,指出利用恒定频率脉冲或线性频率调制脉冲构成的离散频率编码波形,采用优化算法优化频率编码序列后,表现出了较好的综合性能。更多还原

【Abstract】 Theoretical investigations have demonstrate that MIMO technique can dramatically improve the target detection and parameter estimation performance of high frequency surface waver radar(HFSWR)system.The key of those promotion is the orthogonality of transmitted waveforms.To make sure the successful application of those orthogonal waveforms on high frequency surface wave radar,this paper chooses four typical waveforms,including "up"and "down"frequency modulated interrupted continuous wave,time staggered frequency modulated interrupted continuous wave,discrete frequency coding waveform(DFCW),and discrete frequency coding waveform with linear frequency modulated pulse(DFCW-LFM),and analyzes their ambiguity and cross ambiguity properties.By comparing some relating properties,DFCW and DFCW-LFM with optimal frequency coding sequence obtained by optimal algorithm possess better performance.更多还原