连续混沌调频雷达信号分析
doi: 10.3724/SP.J.1146.2009.00251
Analyses of Continuous-Chaos Frequency-Modulating Signal of Radar
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摘要: 该文给出了连续混沌调频信号(CCFMS)的数学表达式，理论推导了CCFMS的自相关函数和均方根带宽。结果表明CCFMS自相关函数的旁瓣抑制性能优异；其均方根带宽与调频指数、混沌信号的均方根成正比。仿真计算了典型混沌产生的CCFMS性能，进一步证明了CCFMS具有较高的时间峰值旁瓣比、平坦的功率谱形状、近似图钉型的模糊函数和与正弦发射信号相同的峰均功率比。分析了CCFMS雷达的抗噪声干扰性能，与线性调频信号雷达相比，信干比改善因子提高约5.5 dB。Abstract: The mathematical expression of Continuous-Chaos Frequency-Modulating Signal (CCFMS) is given. The auto-correlation function and root-mean-square bandwidth of CCFMS are derived in theory. The results show that autocorrelation function of CCFMS has excellent side lobe suppression performance. Its RMS bandwidth is proportional to frequency modulation index and RMS of chaotic signal. The performance of CCFMS is further confirmed with typical chaos. It is found that CCFMS has high time peak to side lobe ratio, flat power spectrum, almost thumbtack ambiguity function and peak to average power ratio equal to that of sinusoidal signal. The performance of CCFMS radar against noise is analyzed. Compared with LFMS radar, CCFMS radar has obvious anti-jamming advantages with signal-to-interference ratio improvement factor increased by about 5.5 dB.
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