基于时频分析的异步跳频网台分选方法仿真  

Simulation of Asynchronous Frequency-Hopping Network Station Sorting Method Based on Time-Frequency Analysis

作　　者：杨芸丞 张立民 钟兆根 YANG Yun-cheng;ZHANG Li-min;ZH0NG Zhao-gen(Navy Aviation University,Yantai Shandong 264001,China)

机构地区：[1]海军航空大学

出　　处：《计算机仿真》2019年第10期15-19,共5页Computer Simulation

基　　金：国家自然科学基金(.61179016),国家自然科学基金重大研究计划(91538201);泰山学者工程专项基金(.ts201511020)

摘　　要：针对目前的跳频网台分选方法计算复杂度高、耗时较长、高速跳频信号适用性低的特点,以符合战场空间环境的α噪声为背景噪声模型,首先对跳频信号进行两次窗函数长短不同的分数低阶STFT,从而得到两组时频数据;然后将两组时频数据点乘,新的时频表示有效地降低了载频估计方差.最后将当前时刻跳频频率集与前一时刻的跳频频率集作比较,实时分选跳频网台.仿真分别给出了不同数据丢失率、不同网台数目时跳频网台分选正确率与载频估计方差的关系.上述方法计算量小,具有一定的理论与应用价值.Aiming at the characteristics of high frequency complexity,long time consumption and low applicability of high-speed frequency hopping signals,this paper takes the noise of the battlefield space environment as the background noise model,and firstly performs two frequency hopping signals. The sub - window function has different fractional low - order STFTs,thereby obtaining two sets of time - frequency data;then multiplying the two sets of time - frequency data points,the new time - frequency representation effectively reduced the carrier frequency estimation variance;and finally the current time hopping frequency set was compared with the frequency hopping frequency set of the previous moment,and the frequency hopping network station was sorted in real time. The simulation experiments show the relationship between the correct rate of frequency hopping station selection and the variance of carrier frequency estimation for different data loss rates and different number of network stations. The method has a small amount of calculation and certain theoretical and practical value.

关 键 词：跳频 分数低阶 时频分析 到达时间 异步网台分选 

分 类 号：TN802[电子电信—信息与通信工程]