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G函数设计是差分跳频抗截获设计的关键。这里研究了差分跳频系统的抗截获设计原则及各项抗截获性能指标的检验方法,分类综述了应用现有G函数的差分跳频系统的抗截获性能。研究表明已有G函数设计方案一般难以获得理想的抗截获性能,或者系统的抗截获性能较好,但系统在译码、同步等方面实现复杂。讨论了应用时频扰动类G函数的差分跳频系统设计模型:时变G函数模型和FH/DFH模型。采用这两种设计模型可在不显著增加系统复杂度的基础上,提高差分跳频通信系统的抗截获性能。
G function design is the key to the design of differential frequency hopping and anti-interception. In this paper, the design principle of anti-interception of differential frequency hopping system and the testing methods of each anti-interception performance index are studied. The anti-interception performance of differential frequency hopping system using existing G functions is reviewed. The research shows that it is generally difficult to obtain the ideal anti-interception performance or the anti-interception performance of the system in the G-function design scheme, but the system is complicated in terms of decoding and synchronization. The design models of differential frequency hopping system using time-frequency perturbation-like G-functions are discussed: the time-varying G-function model and the FH / DFH model. Using these two design models can improve the anti-interception performance of differential FH communication system without increasing system complexity significantly.