| 引用本文: | 杨进,付耀文,杨威.非理想正交发射信号对频控阵波束的影响[J].国防科技大学学报,2022,44(2):104-111.[点击复制] |
| YANG Jin,FU Yaowen,YANG Wei.Effect of transmitting nonideal quadrature signal on frequency diversity array beamform[J].Journal of National University of Defense Technology,2022,44(2):104-111[点击复制] |
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| 非理想正交发射信号对频控阵波束的影响 |
| 杨进1,2,付耀文1,杨威1 |
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(1. 国防科技大学 电子科学学院, 湖南 长沙 410073;2. 湖南第一师范学院 电子信息学院, 湖南 长沙 410205)
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| 摘要: |
| 为考察发射非理想正交基带信号对频控阵波束的影响,基于频控阵信号模型引出了基带信号正交问题,从数学上推导频控阵发射非理想正交基带信号情况下的波束表达式,进一步分析匹配接收处理性能。基于频控阵波束发射和匹配接收计算量,提炼出影响分析评估因子,构建了频控阵基带发射信号正交特性与波束、匹配接收性能的定量分析关系。基于6类典型随机分布二相编码基带信号进行数值仿真,验证了理论分析的正确性。不同随机分布呈现不同基带信号正交特性,其对频控阵波束发射和匹配接收性能的影响随正交特性不同各有差异。单从正交性影响分析而言,基于Normal、Uniform、Logistic随机分布具有更好的频控阵基带信号发射应用潜力。 |
| 关键词: 频控阵 阵列信号 正交信号 波形设计 波束 |
| DOI：10.11887/j.cn.202202013 |
| 投稿日期：2020-09-15 |
| 基金项目:国家自然科学基金面上资助项目(61871384)； 中国博士后科学基金面上资助项目(2016M603004) |
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| Effect of transmitting nonideal quadrature signal on frequency diversity array beamform |
| YANG Jin1,2, FU Yaowen1, YANG Wei1 |
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(1. College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China;2. Electronic Information School, Hunan First Normal University, Changsha 410205, China)
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| Abstract: |
| To analyze the impact of transmitting nonideal quadrature signal on FDA (frequency diversity array) beamform, based on the signal model of FDA, the orthogonality issue of baseband signal was brought out, the beamform expression was deduced mathematically under the condition that FDA system transmitting nonideal orthogonal baseband signal, and the performance of matched reception processing was further analyzed. Based on the calculation amount of beamform transmission and matched reception of FDA system, the influencing factors were extracted, and a quantitative analysis of the relationship between the orthogonal characteristics of the baseband signals and the performance of the beamform and matched reception was constructed. Based on the numerical simulation of six kinds of typical random distribution biphasic coded baseband signals, the correctness of theoretical analysis was verified by experiments. Different random distributions show different baseband signal orthogonal characteristics, and their influence on the performance of FDA beamform transmission and matching reception varies with the orthogonal characteristics. From the perspective of orthogonality, the application potential of baseband signal based on Normal, Uniform and Logistic random distribution is better. |
| Keywords: frequency diversity array array signal orthogonal signal waveform design beamform |
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