| 引用本文: | 曾舰，洪升，王玉皞，严茂松，赵志欣，唐荣欣. MIMO雷达正交频分相位编码波形优化[J]. 雷达科学与技术, 2017, 15(4): 339-346.[点击复制] |
| ZENG Jian, HONG Sheng, WANG Yuhao, YAN Maosong, ZHAO Zhixin, TANG Rongxin. Waveform Optimization of Orthogonal Frequency Division Phase-Coded Signal in MIMO Radar[J]. Radar Science and Technology, 2017, 15(4): 339-346.[点击复制] |
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| 摘要: |
| 正交频分相位编码(Orthogonal Frequency Division-Phase Coded,OFD-PC)信号是多输入多输出(Multiple Input Multiple Output,MIMO)雷达中的一种重要波形。为进一步提高该波形对目标的探测能力，在分析OFD-PC空域合成信号脉压特性的基础上，提出了一种降低其距离旁瓣的波形优化方法。一方面，通过优化选取自相关性能优良的相位编码序列来直接降低空域合成信号的距离旁瓣；另一方面，通过随机离散化OFD-PC信号中的载频间隔，构建一种非均匀间隔的OFD-PC信号形式，进一步改善其距离旁瓣特性。为合理平衡波形的正交性能和自相关性能，建立空时联合优化模型，并采用序列二次规划法求解。仿真结果表明，该方法能在获取近似全向发射功率方向图的同时，降低信号自相关距离旁瓣；所优化设计的波形比传统OFD-PC波形具备更优的脉冲压缩性能。 |
| 关键词: MIMO雷达 波形优化 正交频分相位编码 空域合成信号 脉冲压缩 |
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| 基金项目:国家自然科学基金地区科学基金(No.61661032)；江西省科技厅青年基金项目(No.20161BAB212038)；江西省教育厅青年项目(No.GJJ150097) |
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| Waveform Optimization of Orthogonal Frequency Division Phase-Coded Signal in MIMO Radar |
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ZENG Jian, HONG Sheng, WANG Yuhao, YAN Maosong, ZHAO Zhixin, TANG Rongxin
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School of Information Engineering
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| Abstract: |
| Orthogonal frequency division phase-coded(OFD-PC) signal is an important signal in multiple-input-multiple-output(MIMO) radar.To improve the target detection ability with this waveform, the pulse compression property of the spatial synthesized OFD-PC signal is analyzed, and a waveform optimization method to reduce the range sidelobe is proposed.On one hand, selecting the code sequence with good autocorrelation performance can reduce the sidelobe level directly.On the other hand, building OFD-PC signal with non-uniform frequency interval by randomly discretizing the carrier frequency steps can improve the sidelobe property further.To balance the waveform orthogonality and autocorrelation properties reasonably, a joint temporal-spatial optimization model is established, and the sequential quadratic programming method is utilized to solve the optimization problem.Simulations validate that the autocorrelation sidelobes of the optimized waveform are reduced while the transmitted power beam pattern approaches omnidirectionality, which reveals the superiority of the optimized OFD-PC waveform over the traditional OFD-PC waveform. |
| Key words: MIMO radar waveform optimization orthogonal frequency division phase-coded signal spatial synthesized signals pulse compression |
