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多载波相位编码(multicarrier phase-coded,MCPC)信号作为一种宽带雷达信号,由于具有高频谱利用率,良好的抗干扰能力和调制解调简单等优势而在近几年备受瞩目。但MCPC信号具有较大的包络起伏,这对雷达内部功率放大器的线性动态范围提出极高要求。本文首先针对MCPC信号包络起伏大这一主要缺点,对MCPC雷达信号进行建模并分析信号特点,使用遗传算法,对MCPC雷达信号子载波权重进行调节,该算法在满足功率约束前提下,可得到具有较低包络峰均功率比(peak-to-mean envelope power ratio,PMEPR)的优化信号;然后进一步将满足要求的低PMEPR值设为约束,对MCPC信号自相关旁瓣进行抑制。仿真实验结果表明该方法能在有效降低MCPC的包络峰均比的同时,使发射信号具有良好的自相关特性,优化方法具有实际应用价值。
As a wideband radar signal, multicarrier phase-coded (MCPC) signals have drawn much attention in recent years due to their advantages of high spectral efficiency, good anti-interference ability and simple modulation and demodulation. However, the large envelope fluctuation of the MCPC signal places high demands on the linear dynamic range of the radar’s internal power amplifier. In this paper, aiming at the main shortcomings of large MCPC signal ups and downs, the MCPC radar signal is modeled and the signal characteristics are analyzed. The genetic algorithm is used to adjust the subcarrier weights of the MCPC radar signal. Under the premise of satisfying the power constraint, The optimal signal with the lower peak-to-mean envelope power ratio (PMEPR) is obtained. Then, the low PMEPR satisfying the requirement is further constrained to suppress the autocorrelation sidelobe of the MCPC signal. Simulation results show that this method can effectively reduce the peak-to-average ratio of MCPC and make the transmitted signal have good autocorrelation. The optimization method has practical value.