扰中通链路射频自干扰抑制性能分析

摘要

针对基于射频干扰对消的扰中通系统，本文研究了采用多抽头射频干扰重建技术可获得的自干扰抑制度，给出了抽头数为2的自干扰消除器的解析结构，并分析了干扰消除效果与信号带宽和抽头数的关系。数值分析与计算机仿真结果表明：干扰消除能力随信号带宽增大而减弱，随抽头数增加而提升，对于100 MHz带宽信号，6抽头射频对消器在S频段可提供约70 dB的自干扰消除能力。%For a radio frequency (RF) interference cancellation based communication under jamming system, this paper investigates the achievable self-interference (SI) cancellation capacity of the multi-tap RF interference reconstruction scheme, derives the corresponding signal model in present of two taps, and analyzes the relationship between the cancellation capacity and the SI bandwidth as well as the tap number. The numerical analysis and simulations show that the achievable cancellation capacity decreases as the SI bandwidth increases and 6 taps can degrade an S-band 100-MHz bandwidth SI by about 70 dB.