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提出了一种新型的混沌保密通信破译方法,并破译了混沌直接序列扩频保密通信(简称混沌直扩).针对混沌直扩信号中只有一个混沌吸引子的特点,基于混沌系统广义同步的思想,提出了混沌拟合方法;针对混沌直扩中混沌实值序列和数字信号相乘的特点,充分利用混沌直扩的基本原理和信息码是慢变信号的特性,提出了用无先导卡尔曼滤波混沌拟合的方法估计信息码的破译方法;进一步针对无先导卡尔曼滤波的过程噪声和混沌拟合的拟合误差共同导致的跟踪误差,提出了跟踪误差控制因子的方法,从而将跟踪误差转变成有利因素并加以利用,根据跟踪误差的值域范围破译混沌直扩,得到改进的无先导卡尔曼滤波混沌拟合算法;所提算法无需知道混沌直扩发射机的结构、混沌映射的参数等,并具有一定的抗噪声能力,仿真结果证明了其有效性.
A new type of chaotic secure communication deciphering method is proposed and the chaotic direct sequence spread spectrum secure communication (chaotic direct spread) is deciphered.According to the chaotic system that there is only one chaotic attractor in the chaotic DS signal, , A chaotic fitting method is proposed. According to the chaotic real-valued chaotic real-valued sequences and digital signal multiplication characteristics, make full use of the basic principle of chaotic direct spread and information code is a slow-changing signal characteristics, Filter chaos fitting method to estimate the decoding method of information code; further for the no-lead Kalman filter process noise and chaotic fitting fitting error caused by the tracking error, the tracking error control factor is proposed, so that the tracking error The chaotic direct expansion is solved according to the range of tracking error, and the improved chaotic fitting algorithm without pilot Kalman filtering is obtained. The proposed algorithm does not need to know the structure of chaotic DSSS transmitter and the parameters of chaotic map Etc., and has a certain anti-noise ability, the simulation results prove its effectiveness.