| 摘要: |
| MIMO雷达中传统正交频分线性调频( OFD-LFM)波形的空域合成信号存在较高的自相关栅瓣。为了解决这一问题，本文在OFD-LFM波形上调制相位编码序列，构造新的正交频分线性调频相位编码(OFD-LFM-PC)波形以消除空域合成信号自相关栅瓣。由于相位编码的调制，使得OFD-LFM-PC波形空域合成信号的自相关栅瓣消除但整体旁瓣水平有所升高，同时，发射功率方向图非全向。为此，基于OFD-LFM-PC波形的时域特性和空域特性分析，本文建立了空时特性优化模型，对调制的相位编码矩阵和载波频率编码序列进行联合优化，并提出了一种嵌套遗传算法的粒子群算法求解该优化问题。仿真结果表明，所优化设计的OFD-LFM-PC波形能够保证发射功率方向图的全向性，并且空域合成信号具有良好的自相关性能。 |
| 关键词: MIMO雷达 OFD-LFM-PC波形 粒子群算法 遗传算法 |
| DOI：DOI:10.3969/j.issn.1672-2337.2020.03.013 |
| 分类号:TN958.5 |
| 基金项目:国家自然科学基金(No.61661032,61461030)； 中国博士后科学基金(No.2017M622102)；江西省博士后科研项目(No.2017KY36)； 江西省自然科学基金(No.20161BAB212038, 20181BAB202002)； 南昌大学研究生创新专项资金(No.CX2018159) |
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| Optimal Design of OFD-LFM-PC Waveforms in Space-Time Domain for MIMO Radar |
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HONG Sheng， DONG Yantao， AI Yu， ZHAO Zhixin
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School of Information Engineering, Nanchang University， Nanchang 330031, China
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| Abstract: |
| High gating sidelobes exist in the autocorrelation function of the spatial synthesized orthogonal frequency division-linear frequency modulation (OFD-LFM) waveforms in multiple input multiple output (MIMO) radar. To solve this problem, the phase coded sequences are modulated on the OFD-LFM waveform to construct a new orthogonal frequency division-linear frequency modulation-phase coded (OFD-LFM-PC) waveform to eliminate the autocorrelation grating lobes of the spatial synthesized signal in this paper. Due to the phase modulation, the gating sidelobes of the spatial synthesized OFD-LFM-PC signal are eliminated but the 〖KG-*4〗overall sidelobe level is increased, meanwhile, the transmit power pattern is no longer omnidirectional. Therefore, based on the temporal and spatial analysis of the OFD-LFM-PC waveforms, a space-time joint optimization model is established; the phase coded matrix and the carrier frequency coded sequence are jointly optimized; and a particle swarm algorithm nested genetic algorithm is proposed to solve this problem. Simulation results show that the optimized OFD-LFM-PC waveform can obtain the omnidirectional transmit power pattern and ensure that the spatial synthesized signal has good autocorrelation performance. |
| Key words: MIMO radar OFD-LFM-PC waveforms particle swarm optimization genetic algorithm |
