面向电子战射频光传输的宽带射频信号杂散产生机理及优化方法

针对电子战系统的宽带射频信号波分复用传输,通过理论分析给出了微波光子链路中各关键参量对杂散信号的影响规律,提出了非均匀信道间隔分配的除杂优化方法。该方法通过微调各通道的波长,使四波混频产生的杂散频率超过电子战接收机带宽,从而降低杂散对系统的影响。该方案实现简单,且无需改变现有电子战系统架构,具有较好的工程实现性。实验结果表明:与等波长间隔相比,5通道非均匀波分复用信号传输1 km时,在接收机带宽内四波混频引起的杂散得到了显著优化,动态范围提升了26 dB以上。

Generation Mechanism and Optimization Method of Wideband RF Spurious Signals for RF Optical Transmission of Electronic Warfare

Aiming at WDM transmission of wideband RF signal in electronic warfare system, this paper gave the influence rule of key parameters in microwave photonic link on spurious signal through theoretical analysis, and put forward the optimization method of non-uniform channel spacing assignment. By fine-tuning the wavelength of each channel, the frequency of spurious signals generated by four-wave mixing exceeded the bandwidth of the EW receiver, so as to reduce the influence of spurious signals on the system. The scheme was simple to implement and had good engineering implementability without changing the existing electronic warfare system architecture. The experimental results show that, compared with the uniform wavelength intervals, when the 5-channel non-uniform WDM signals is transmitted for 1km, the spurious signals caused by four-wave mixing in the receiver bandwidth are significantly optimized, and the dynamic range is increased by more than 26dB.