组合跳变随机平移宽间隔混沌跳频序列设计

为进一步提高宽间隔跳频序列的性能，基于混沌跳频序列，针对随机平移替代法存在的“窄点”平移与序列平衡性的矛盾问题，提出了一种新的组合跳变随机平移法。该方法在随机平移替代法的基础上取消“窄点”修正，引入组合跳变序列控制频点宽间隔映射。为兼顾组合跳变随机平移法产生序列的平衡性、汉明自相关性和宽间隔特性，构造了跳频序列的复合目标优化函数，引入粒子群算法计算得到最优的序列控制参数。仿真结果表明，组合跳变随机平移法可构造更多的序列，且产生的宽间隔混沌跳频序列具有更好的平衡性、汉明相关性和复杂度，采用粒子群优化获取的控制参数可以实现序列性能的均衡最优。

Design of combined-hopping-random-shift wide-gap chaotic frequency hopping sequences

In order to improve the performance of the wide-gap frequency hopping(FH) sequences,a new combined-hopping-random-shift method is proposed to solve the contradiction between narrow point translation and sequence balance based on chaotic FH sequences.Based on the random-shift-replace method,new method cancels correction of narrow point and introduces the combined hopping sequence to control wide-gap frequency point mapping.In order to give consideration to the balance,Hamming autocorrelation and wide interval characteristic of the sequences generated by the combined hopping random replace method,the composite objective optimization function of FH sequences is constructed,and the Particle Swarm Optimization(PSO) algorithm is introduced to calculate the optimal sequence control parameters.The simulation results show that,the combined-hopping-random-shift method proposed can construct more sequences,and wide-gap chaotic hopping sequences generated have better Hamming correlation,wide interval characteristics and complexity,and the control parameters obtained by PSO can achieve the best balance of sequence performance.