雷达干扰训练器噪声干扰源的设计

摘要

为了减少噪声,设计了一种基于混沌伪随机数叠加直接数字频率合成(DDS)信号的高精度数字式噪声发生器.分析了改进型Logistic混沌序列的原理,利用映射函数方法,实现了均匀分布噪声到高斯分布噪声的快速转换；阐述了DDS原理及其产生方法,利用FPGA实现了混沌伪随机序列模块、DDS模块和信号叠加模块等功能.测试结果表明,该噪声发生器产生的复杂数字噪声对雷达具有很好的干扰作用.%In order to reduce noise, a high-precision digital noise generator based on chaotic pseudo-random sequence and DDS digital signal is designed. The principle of improved Logistic chaos sequence is analyzed, the map function method is used to implement the quick transformation from homogeneous distribution noise to Gaussian distribution noise, the principle of DDS and its generation method are described, and the FPGA is adopted to implement the functions of chaotic pseudo-random sequence module, DDS module and signal superposition module. The test result shows that the complicated digital noise generated by this noise generator offers great interference function to the radar.