机载超短波电台邻道干扰减敏特性建模与评估

摘要

Aimed at solving the problem of big error between the measured data and the calculated results of traditional adjacent interference model,the model of signal-to-noise ratio and the model of nonlinear response at receiver radio frequency front end are combined.Considering the noise generated by frequency mixing between adjacent frequency interference signal and the local oscillator phase noise,the model of the reduction of very high frequency (VHF) radio sensitivity is proposed by giving a noise correction factor.The error of the approach is about 3 dB compared with the typical measured data.The comparison between the calculated results and test data shows that the approach can describe the sensitive characteristics of adjacent channel interference accurately.The assessment method of the adjacent channel interference between airborne radios is presented by giving the calculation flow with helicopter fleet application example,which verifies the applicability and effectiveness of the above methods and shows that the approach and assessment method have certain engineering application value.%为了解决传统邻道干扰模型与测试数据对比误差较大的难题,将接收机射频前端的非线性响应模型和信噪比模型相融合,考虑到邻道干扰信号与本振相位噪声混频而产生的噪声,提出了噪声修正因子,进一步建立了超短波(VHF)电台接收机邻道干扰减敏模型,与典型实装测试数据相对比误差约为3 dB,表明本文方法能够很好地描述邻道干扰的减敏特性.利用本文模型给出了机载超短波电台邻道干扰评估方法,结合直升机编队飞行时电台邻道干扰评估案例,验证了本文方法的适用性和有效性,具有一定的工程应用价值.