DDMA-LFM波形的MIMO模糊函数分析  

Analysis of MIMO ambiguity function of DDMA-LFM waveforms

作　　者：梅慧 易堃 宋柯 祝伟才 汪超 李乾 Mei Hui;Yi Kun;Song Ke;Zhu Wei-cai;Wang Chao;Li Qian(Shanghai Radio Equipment Research Institute,Shanghai 201109,China)

机构地区：[1]上海无线电设备研究所,上海201109

出　　处：《电子测量技术》2022年第5期49-54,共6页Electronic Measurement Technology

摘　　要：由于MIMO雷达波形的选择与参数设计直接决定了雷达的探测性能、系统分辨率、探测精度以及潜在的抗干扰性能,基于模糊函数理论以及MIMO阵型参数,对DDMA-LFM波形集的时频空三维的模糊函数进行分析,分析其波形集与阵列流型相互作用后同雷达在距离-速度-方位三个维度的探测性能的关系。结合发射波形集与雷达阵列流型推导三维的时延-多普勒频率-空间方位MIMO模糊函数,通过公式推导以及仿真分析发现,DDMA-LFM波形无需通过优化编码等,保证了信号的连续性同时简化了设计过程。同时,DDMA-LFM距离(时延)分辨性能与空间方位可独立分离,多普勒频率与空间方位存在相互耦合,但在有效多普勒谱宽内不影响雷达分辨性能,且波形集与阵列相互作用能一定程度上提高某些方位的角度分辨率达5°左右。Selection and parameter design of MIMO radar waveform directly determine the key radar performance such as detection range,system resolution and accuracy,and potential ability of anti-interference.Based on the fuzzy function theory and MIMO formation parameters,analyzes the time-frequency-space 3 D fuzzy function of DDMA-LFM waveform set,and analyzes the relationship between the waveform set and array flow pattern and radar detection performance in range-velocity-azimuth three dimensions.Combing the transmitted waveform set and the radar array flow pattern to derive the three-dimensional time delay-Doppler frequency-space orientation MIMO ambiguity function.Through formula analysis and simulation results,it is concluded that the continuity of the waveform is ensured and the design process is simplified.In the process of designing the orthogonal DDMA-LFM waveform parameters of the multiple-input multiple-output(MIMO)radar system,there is no need to optimize the coding.What’s more,the range(time delay)resolution performance and the spatial orientation can be separated independently,and the Doppler frequency and the spatial orientation are mutually coupled but the radar resolution performance is not affected within the effective Doppler spectral width,meanwhile the interaction between the waveform set and the array can improve the angular resolution of certain orientations to a certain extent about 5°.

关 键 词：多普勒谱分多址 线性调频 多输入多输出 模糊函数 

分 类 号：TN951[电子电信—信号与信息处理]