| 摘要: |
| 针对雷达通信一体化信号在低信噪比（SNR）环境下微弱目标检测性能不足的问题，本文提出了一种基于信号重构的多载波线性调频连续相位调制（LFM-CPM）一体化信号设计方案。首先，建立了多载波LFM-CPM信号以及重构后信号的数学模型，并利用带通滤波器组将多载波LFM-CPM信号重构为线性调频信号；其次分析了其模糊函数特性及脉冲压缩性能，证明其在匹配滤波后可获得较好的旁瓣抑制性能；最后，分析了该信号的雷达微弱目标检测性能与通信误码率等关键指标。仿真实验结果表明，相较于现有典型一体化信号，所提出的多载波LFM-CPM信号在低SNR的条件下可实现检测概率提升13 dB，同时在保持通信速率不低于16QAM调制方案50%的前提下，该方案误码率性能较16QAM提升4 dB，有较好的雷达探测和信息传输能力。 |
| 关键词: 雷达通信一体化 连续相位调制 多载波 微弱目标检测 |
| DOI：DOI:10.3969/j.issn.1672-2337.2026.02.011 |
| 分类号:TN957 |
| 基金项目:国家自然科学基金（62161029） |
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| Design of Multi-Carrier LFM-CPM Integrated Signal Based on Weak Target Detection |
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FU Jilin， RAO Xuan
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School of Information Engineering, Nanchang Hangkong University, Nanchang 330063, China
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| Abstract: |
| To improve the insufficient weak target detection performance of radar-communication integrated signals in low signal-to-noise ratio （SNR） environments, a novel multi-carrier linear frequency modulation-continuous phase modulation （LFM-CPM） signal design scheme based on signal reconstruction is proposed in this paper. Firstly, the mathematical models of the multi-carrier LFM-CPM signal and the reconstructed signal are established respectively. Then, a bank of bandpass filters is employed to reconstruct the multi-carrier LFM-CPM signal into a linear frequency-modulated signal. Next, the ambiguity function characteristics and pulse compression performance as well as the performance of sidelobe suppression after matched filtering are analyzed. Finally, the radar weak target detection performance and communication bit error rate are discussed. Simulation results show that compared with the existing typical integrated waveforms, the proposed multi-carrier LFM-CPM signal achieves a 13 dB improvement in detection probability under low SNR conditions. Meanwhile, while maintaining a communication rate no less than 50% of the 16QAM scheme, the proposed method provides a 4 dB BER performance gain over 16QAM, which show good radar detection and communication capabilities. |
| Key words: radar-communication integration continuous phase modulation multi-carrier weak target detection |
