连续波无线电引信信号识别及模拟干扰技术研究

【作者】 张晋华；

【导师】 赵惠昌； 张淑宁；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2008， 硕士

【摘要】 本文以射频信号处理器为硬件平台,以图形化语言LabVIEW为软件平台,研究了连续波无线电引信信号识别及模拟干扰技术。本文的工作为实验室研究引信的干扰与抗干扰提供了参考。论文按照引信模拟干扰实验的原理展开研究,主要内容包括:(1)引信信号的获取。基于射频信号接收模块,通过搜索式接收方法获取引信信号的中心频率、工作带宽,并对其进行下变频、数字化等处理,从而为后续调制信号的识别及干扰做准备。(2)调制制式识别。基于决策理论给出了决策树识别方案,用LabVIEW 7.1软件编制了相应的自动识别模块完成对DSB、FM、2ASK、2FSK、2PSK、LFM(线性调频信号)和PRCPM(伪码调相信号)的自动识别。(3)特征参数提取。在对上述信号正确识别的基础上研究了连续波无线电引信—LFM和PRCPM的解调和参数识别,对LFM采用正交解调的方法进行解调并获得了调制信号形式和调制频偏、调制信号周期等参数;对PRCPM采用相干解调的方法进行解调,根据基于m序列特性的PN码特征参数提取算法获得了码元周期和伪码序列。(4)干扰信号的产生。研究了两种干扰方式:欺骗性干扰和压制性干扰,并给出了干扰结果。对于欺骗性干扰,将解调得到的调制信号重构循环延时作为干扰信号;对于压制性干扰,编制了干扰波形数据库,从干扰波形数据库中选择干扰波形,设置干扰参数,对引信进行干扰。更多还原

【Abstract】 Based on the RF signal processor and Graphics language - LabVIEW, cw radio fuse recognition and simulative jamming technology are introduced in this paper. The work of this paper provide a reference for laboratory to study the jamming and anti-jamming of fuse. According to the principle of simulative jamming experiment, the structure of this paper is as follows:(1) Interception of the fuse signal. Based on the NI RF signal receiving module, the center frequency and the bandwidth of the fuse signal are acquired by the method of searching receiver. And then the signal is down converted to fixed interim frequency and digitally processed and so on. All those are prepared for the follow-up recognition and jamming of signal.(2) Recognition of the modulation type. Based on decision-making theory, a automatic modulation recognition module is established by LabVIEW to accomplish a recognition of the signals which include DSB, FM, 2ASK, 2FSK, 2PSK, LFM(Liner-frequency modulation) and PRCPM(pseudo random code phase modulation).(3) Extraction of feature parameter. The demodulation and parameter recognition of LFM and PRCPM signals are studied based on the right signal recognition. The LFM signal is demodulated by the method of the orthogonal demodulation, the modulation parameters such as the frequency offset, the modulation signal cycle are acquired. The PRCPM signal is demodulated by the method of the correlation demodulation, based on the PN code’s feature parameters extraction algorithm of m-sequence properties, the cycle and the pseudo-code sequence are acquired.(4) Production of the jamming signal. Deceiving jamming and suppressing jamming are discussed and the jamming results are acquired. For the deceiving jamming, reconstructed modulation signal is cycle delayed as a jamming signal, For the suppressing jamming, jamming waveform database is established. From the established database jamming waveform is chose and jamming parameters are set to jam the fuse.更多还原