跳频电台互调干扰估计的蒙特卡罗方法研究

在战场条件下，密集的用频装备之间所产生的互调干扰会造成信号严重失真，影响指挥通信控制系统（C3）的正常运转。针对电子战仿真环境中工作在VHF频段战场跳频电台之间的互调干扰问题，分析了互调干扰发生的时间、频率和功率条件，以及跳频电台随机位置和阴影效应的影响。研究了决定互调干扰概率的3个条件概率：两个及以上活跃信道的概率、活跃信道中信号频率满足互调干扰频率条件的概率和信号功率满足互调干扰功率条件的概率。在此基础上提出了基于蒙特卡罗方法的战场环境下跳频电台的互调干扰概率估计算法，并分别针对2路、3路信号的3阶互调干扰的仿真结果进行了仿真验证。仿真结果表明，提出的战场环境下跳频电台互调干扰概率估计方法，可以有效地对互调干扰概率进行估计，估计结果对于战场环境的电子战仿真以及战场的作战指挥具有一定的指导和借鉴意义。

Monte-Carlo method based FH radio intermodulation interference probability estimation

Under the battlefield environment, the intermodulation interference produced by the space compressed frequency equipment brings serious distortion to the signals and affects the normal operation of the C3 system. Focusing on the intermodulation interferencebetween the frequency hopping (FH) radios working on the VHF band, the time, frequency and power conditions are analyzed, and the FH radio’s random location and the shadowing effects are also included. Three conditional probabilities that determine the intermodulation interference probability are studied, which respectively are, probability of the availability of two or more active frequency channels; probability that the frequencies of the active channels satisfy the intermodulation interference frequency condition; and probability that the active channel signal powers satisfy the intermodulation interference power condition. The simulation results for the probability of two and three signals 3rd order intermodulation interference are presented. A method for FH radio intermodulation interference probability estimation based on Monte-Carlo method is proposed. The simulation results show that, the proposed method can estimate the intermodulation interference probability effectively, and it can provide reference for the electronic warfare simulation and the operational command in the battlefield.