MIMO雷达正交频分相位编码波形优化

发布时间：2018-03-11 13:12

本文选题：MIMO雷达　切入点：波形优化　出处：《雷达科学与技术》2017年04期 　论文类型：期刊论文

【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。
[Abstract]:Orthogonal Frequency Division-Phase coded OFD-PC (orthogonal Frequency Division-Phase coded OFD-PC) signal is an important waveform in multi-input and multi-output multiple Input Multiple output MIMO radar. In order to further improve the detection ability of this waveform, the pulse compression characteristics of OFD-PC spatial synthetic signal are analyzed. In this paper, a waveform optimization method for reducing the range sidelobe is proposed. On the one hand, the range sidelobe of spatial synthetic signals is directly reduced by optimizing the phase coding sequence with good autocorrelation performance; on the other hand, Based on the random discrete carrier frequency interval in OFD-PC signals, a non-uniform interval OFD-PC signal form is constructed to further improve the distance sidelobe characteristics. In order to balance the orthogonal and autocorrelation performance of the waveform, a space-time joint optimization model is established. The simulation results show that the proposed method can reduce the autocorrelation distance sidelobes while obtaining the approximate omnidirectional transmission power pattern. The optimized waveform has better pulse compression performance than the traditional OFD-PC waveform.
【作者单位】：南昌大学信息工程学院;
【基金】：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)
【分类号】：TN958

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