基于导频的同频噪声干扰对消技术

Pilot-aided cancellation technology for co-frequency noise interference

大功率发射机产生的宽带噪声干扰会对共址高灵敏度接收机造成不同程度的同频噪声干扰。针对此问题,提出了基于导频的同频噪声干扰对消技术,该技术基于自适应对消原理,通过在发射端引入幅度和频率可控的稳定的导频信号,实现同频噪声的有效对消。建立了基于导频的同频噪声干扰对消理论模型,得到了同频噪声干扰对消比与导频幅度、频率之间的解析关系,可用于指导导频幅度、频率的精确控制。超短波频段的仿真和实验表明,使用基于导频的同频噪声干扰对消技术可以稳定、有效地消除同频噪声干扰。

The wide-band noise interference generated by the high-power transmitter will cause varing degrees of co-frequency noise interference to the high-sensitivity receiver in the co-site situation.Based on the principle of the adaptive cancellation technology,an effective co-frequency noise cancellation technology is proposed by introducing stable pilot signals with controllable amplitude and frequency at the transmitter.The theoretical model of the pilot-aided cancellation technology for the co-frequency noise interference is established,and the analytical relationship between the interference cancellation ratio of the co-frequency noise and the amplitude and frequency of the pilot is obtained,which can be used to guide the precise control of the pilot amplitude and frequency.The simulations and experiments show that the pilot-aided cancellation technology for the co-frequency noise interference can eliminate the interference of the same frequency noise stably and effectively.