针对对称混合调制信号的识别问题,在单通道接收的条件下,对信号的频谱特性和幅度特征分析进行研究实现了10种双路对称混合信号的调制识别其中还包括性能优化的高阶APSK信号。首先提取8个特征参数,然后根据不同信号特征参数的差异设计分...针对对称混合调制信号的识别问题,在单通道接收的条件下,对信号的频谱特性和幅度特征分析进行研究实现了10种双路对称混合信号的调制识别其中还包括性能优化的高阶APSK信号。首先提取8个特征参数,然后根据不同信号特征参数的差异设计分类决策树。仿真结果表明,该算法计算量小能同时适用于多种混合调制信号的识别,在信噪比大于10 d B的条件下,具有良好的识别性能。同时,该算法不需要先验知识避免了复杂的预处理过程且算法对信号定时、相位偏差和频偏不敏感,具有较好的鲁棒性。展开更多
Based on the advantage of phase coded signal and stepped frequency signal,a new hybrid modulation signal is introduced in this paper. It combines phase code modulation during the pulse with stepped frequency modulatio...Based on the advantage of phase coded signal and stepped frequency signal,a new hybrid modulation signal is introduced in this paper. It combines phase code modulation during the pulse with stepped frequency modulation between the pulses, which is named as phase-coded stepped-frequency ( PCSF ) signal. By analyzing its waveform and ambiguity function,the comparison between Stepped-Frequency ( SF) signal and PCSF signal is given,which shows that the PCSF signal is better than SF signal. Finally,the signal processing method with two stage compressed processing is presented. The simulation results show that this new hybrid modulation radar signal can get a higher stepped frequency than ordinary SF signal,realize the same equivalent bandwidth with less pulse number,and solve the conflict among the stepped frequency,the number of pulse, and transmit average power. Under the premises of a certain range resolution,this new hybrid modulation radar signal not only raises the data rate of radar system,but also reduces Doppler sensitivity with a good prospect, and the effect of one-dimensional range profile is much better than that of traditional SF signal. Therefore,this new hybrid modulation radar signal can be widely used in application.展开更多
在电子对抗领域,信号调制方式识别是进行雷达分选、干扰施放的基础,得到广泛研究。对此,文中提出了一种以信号频谱相像系数和幅度统计参数为分类特征的FSK/BPSK复合调制雷达脉冲信号识别算法。算法首先提取雷达脉冲信号的频谱相像系数...在电子对抗领域,信号调制方式识别是进行雷达分选、干扰施放的基础,得到广泛研究。对此,文中提出了一种以信号频谱相像系数和幅度统计参数为分类特征的FSK/BPSK复合调制雷达脉冲信号识别算法。算法首先提取雷达脉冲信号的频谱相像系数和幅度统计参数,然后采用分层结构的神经网络分类器进行识别。该算法不仅能识别FSK/BPSK复合调制信号,且对其他常用雷达信号调制方式的识别不产生干扰。仿真结果表明,针对FSK/BPSK以及CW、LFM、BPSK、QPSK、FSK等常用雷达信号调制类型,在信噪比>5 d B时,分类正确率可达98%以上。展开更多
文摘针对对称混合调制信号的识别问题,在单通道接收的条件下,对信号的频谱特性和幅度特征分析进行研究实现了10种双路对称混合信号的调制识别其中还包括性能优化的高阶APSK信号。首先提取8个特征参数,然后根据不同信号特征参数的差异设计分类决策树。仿真结果表明,该算法计算量小能同时适用于多种混合调制信号的识别,在信噪比大于10 d B的条件下,具有良好的识别性能。同时,该算法不需要先验知识避免了复杂的预处理过程且算法对信号定时、相位偏差和频偏不敏感,具有较好的鲁棒性。
基金Sponsored by the Nation Nature Science Foundation of China(Grant No. 61201237)the Nature Science Foundation of Heilongjiang Province of China(Grant No. QC2012C069)the Fundationtal Research Funds for the Central Universities (Grant No. HEUCFZ1129, HEUCF130810,HEUCF130817)
文摘Based on the advantage of phase coded signal and stepped frequency signal,a new hybrid modulation signal is introduced in this paper. It combines phase code modulation during the pulse with stepped frequency modulation between the pulses, which is named as phase-coded stepped-frequency ( PCSF ) signal. By analyzing its waveform and ambiguity function,the comparison between Stepped-Frequency ( SF) signal and PCSF signal is given,which shows that the PCSF signal is better than SF signal. Finally,the signal processing method with two stage compressed processing is presented. The simulation results show that this new hybrid modulation radar signal can get a higher stepped frequency than ordinary SF signal,realize the same equivalent bandwidth with less pulse number,and solve the conflict among the stepped frequency,the number of pulse, and transmit average power. Under the premises of a certain range resolution,this new hybrid modulation radar signal not only raises the data rate of radar system,but also reduces Doppler sensitivity with a good prospect, and the effect of one-dimensional range profile is much better than that of traditional SF signal. Therefore,this new hybrid modulation radar signal can be widely used in application.
文摘在电子对抗领域,信号调制方式识别是进行雷达分选、干扰施放的基础,得到广泛研究。对此,文中提出了一种以信号频谱相像系数和幅度统计参数为分类特征的FSK/BPSK复合调制雷达脉冲信号识别算法。算法首先提取雷达脉冲信号的频谱相像系数和幅度统计参数,然后采用分层结构的神经网络分类器进行识别。该算法不仅能识别FSK/BPSK复合调制信号,且对其他常用雷达信号调制方式的识别不产生干扰。仿真结果表明,针对FSK/BPSK以及CW、LFM、BPSK、QPSK、FSK等常用雷达信号调制类型,在信噪比>5 d B时,分类正确率可达98%以上。
