基于转移概率的跳频图案分析与干扰方法

通过分析频率跳变中的转移概率特性,对比了常规跳频、差分跳频的几种典型实现方式中跳频图案变化的状态转移特性,分析结果表明,转移概率对跳频系统抗截获和干扰性能有重要影响,差分跳频虽能提供基于信息数据的更随机化跳频图案,但就转移概率特性而言与常规跳频差别不大,且差分转移阶数较低时其抗干扰性能不如常规跳频. 所提基于跳频转移概率分析的跳频图案分析和干扰方法更简单实用,且可根据性能指标和实际转移概率分布进行干扰策略的动态调整.

Transition Probability Based Frequency Hopping Signal Analysis and Jamming

Analysis of transition feature of frequency hopping (FH) sequence was given for traditional frequency hopping (TFH) and correlated hopping enhances spread spectrum (CHESS) or differential frequency hopping (DFH) systems. It demonstrates that the transition probability distribution (TPD) of FH is very important for performance of both TFH and CHESS system, and that though CHESS can provide non-fixed frequency hopping pattern (FHP) for better anti-interceptions, its anti-jamming performance might be lower than that of TFH systems if its fan-out is not big enough. The proposed method TPD based FHP analysis and interference method does not require exact FHP, therefore it is much easier to implement; furthermore jamming strategy thus jamming efficiency can be dynamically adjusted according to some constraints or obtained TPD on-site.