基于改进PSO 的双时间常数伪速率脉冲调制器设计

设计一种双时间常数的伪速率调制器, 在分析调制器基本原理的基础上, 给出调制器脉冲时间和描述函数的计算方法. 针对调制器参数众多的问题, 提出一种改进的粒子群优化算法, 将动态惯性权重设计为一种二次指数型函数, 并引入粒子和全局最优点距离量, 使得惯性权重不仅随着迭代次数变化, 而且与其距全局最优点的距离有关. 综合时间最优和燃料最优两项指标, 将粒子群适应度函数设计成与时间和燃耗的函数. 最后通过仿真验证了所提出的改进的调制器结构和参数寻优算法的有效性.

Design of double-time-current pseudo rate modulator based on improved PSO algorithm

A kind of pseudo rate modulator with two-time-constant is designed. The basic working principle is analyzed and the pulse time and describing function are provided. An improved particle swarm optimization algorithm is proposed with several modulator parameters. A quadratic exponent function is designed for the nonlinear dynamic inertia weight. And the distance between particle and the global optima is introduced. Thus the inertia weight changes with the number of iterations as well as the distance from the global optima. The optimal state of time and fuel are combined and the fitness function is scheduled as the function of time and the fuel consuming. Finally, simulation verifies the effectiveness of the improved constructure of the pseudo rate modulator and the parameter-optimizing algorithm.