直扩通信的相关干扰模型建立与分析

Establishment and Analysis of Correlation Interference Model for Direct Spread Communication

针对扩频通信系统低截获性和抗干扰性,常规的干扰方式如单音干扰、宽带扫频干扰等在其应用中存在干扰效率低和功率要求高等缺点,着重研究了对直接扩频通信更高效的相关性干扰。通过建立相关干扰模型,理论推导接收端影响干扰效果的因素,并进行仿真实验得到了相应结论:干扰信号与目标的扩频序列相关系数为1和-1,发射延时为整数倍扩频周期且无频偏时,可以实现理想的干扰效果;扩频序列不全相同,非整数倍延时以及增大频偏都会削弱干扰效果,提高干信比能够弥补干扰效果的降低。此外,总结了对直接扩频通信的相关干扰在非理想条件下干扰性能的规律,在实际应用中可通过该结论来调整具体干扰参数来实现低成本的有效干扰。

Aiming at the low interception and anti-interference of spread spectrum communication system,the conventional jamming methods such as single voice jamming and broadband sweep jamming have the disadvantages of low jamming efficiency and high power requirement.This paper focuses on the more efficient correlation jamming to direct spread spectrum communication.By establishing the correlation jamming model,the factors affecting the jamming effect at the receiving end are theoretically deduced,and carries on the simulation experiment is to verify and obtain the corresponding conclusion.It is concluded that the jamming signal is the same or opposite to the target,and can achieve the desired jamming effect when the emitting delay is multifold and there is no frequency deviation.Different spread spectrum sequences,non-integer multiple delays and increasing frequency offset will weaken the interference effect,and improving the interference signal ratio can make up for the reduction of interference effect.This paper summarizes the interference performance of correlation interference to direct spread spectrum communication under non ideal conditions.In practical application,the specific interference parameters can be adjusted through the conclusion of this paper to achieve low-cost effective interference.