舰船通信集成交互调影响评估方法

多部舰载通信电台集成共用一副天线时,因非线性效应产生大量交互调产物,对通信接收信道及舰船电磁环境造成干扰.首先构建交互调产物数学模型,求解出交互调产物数量与通信集成路数和交互调产物阶数之间的关系.然后以超短波通信为例,通过计算交互调干扰对天线带内可用频率资源的最恶劣影响情况,以及交互调产物在天线工作频带内的频率分布情况,给出评估交互调对频域影响程度的方法示例.最后提出降低通信集成路数或高阶非线性效应、天线收发分置、提高发射频率相关性且收发异频等建议措施,减小通信集成受到的交互调影响.

Evaluation Method for the Intermodulation Interference in an IntegratedShipboard Communication System

When an antenna is shared by multiple onboard communication transmitters and receivers,se-vere interference of nonlinear intermodulation may occur,and the overall electromagnetic environment willbe affected. Aiming at the problem,this paper focuses on the generation principle of the interference anddevelops a module to calculate the exact intermodulation effects. Also,the relation between the number ofcommunication channels and intermodulation products is provided. To demonstrate the proposed model,an ultrashort wave antenna is examined for the frequency distribution of intermodulation and the worst caseof interference,and a method is then given to evaluate the impact degree of the interference. Finally,sever-al available solutions to reduce the intermodulation interference are proposed,including reducing the num-ber of communication channels,restraining the higher-order non-linear effects using T/R separate anten-na systems,and increasing the transmitting frequency correlation in the pilot frequency communication sys-tem.