针对差分跳频技术提出了一种G函数的非二进制卷积编码的等效模型，给出了差分跳频信号的最佳接收机设计方法，研究了维特比硬判决和维特比软判决两种最大似然检测算法，并对在AWGN信道下的两种最大似然检测算法的性能进行了计算机仿真。仿真结果表明，接收机采用最大似然检测算法对于改善系统的性能有明显的作用，对维特比硬判决法的实现方法进行了描述。关 键 词 差分跳频；G函数；维特比算法Abstract According to the characteristic of differential frequency hopping, this paper presents a nonbinary convolutional code equivalent model of G function and the design of optium receiver for differential frequency hopping signal. The paper also studies two maxium-likelihood detect algorithms (Viterbi hard-decision detection algorithm and Viterbi soft-decision algorithm) and computer simulations indicate that the maxium-likelihood method can greatly improves performance of differential frequency hopping system for AWGN channel .Finally ,the realization of Viterbi hard-decision detection algorithm is described.Key words differential frequency hopping; G function; Viterbi algorithm