基于后验概率的伪码预测研究  

Study on PN Codes Forecast Based on Posterior Probability

作　　者：李鹏[1] 万汉阳[1] 张葵[1] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071

出　　处：《电讯技术》2006年第5期55-57,共3页Telecommunication Engineering

基　　金：国家重大基础研究计划(973计划)资助项目(A11503020144)

摘　　要：卫星通信对抗是电子对抗的一个重要领域,由于卫星链路一般采用扩频技术,传统的干扰方法难以奏效。通过分析伪随机序列的伪随机性,提出了基于后验概率的伪码预测方法。该方法可以根据接收到的伪码计算其后验概率,并以此来预测随后的伪码序列。仿真结果表明,该方法对短码有较好的预测效果。最后,给出了预测方法在瞄准式干扰中的具体应用。Satellite communications countermeasure is an important aspect in ECM （electronic countermeasure）. As the links of satellite communications usually employ spread spectrum technology, traditional jamming methods don＇t work effectively. A new method of PN codes forecast is proposed in this paper based on the analysis of randomicity of PN sequences. It firstly calculates the probability of the received PN codes and then forecasts succedent PN sequences. Simulation shows that the method is effective. Finally, the application of this method in spot jamming is given.

关 键 词：卫星通信对抗 卫星链路 伪码预测 扩频通信 瞄准式干扰 后验概率 

分 类 号：TN975[电子电信—信号与信息处理] TN911.6[电子电信—信息与通信工程]