East China Research Institute of Electronic Engineering
瞬时测频（IFM）是现代电子战中的一项重要技术。基于光子辅助的IFM技术具有大带宽、低损耗、小尺寸、轻重量和抗电磁干扰等优势，可克服传统电子学方法的瓶颈，因此备受青睐。该文在已有研究基础上，给出了另一种测频误差更小的光子辅助瞬时测频方法，通过搭建具有射频功率响应互补特性的光链路，实现了对0.5 GHz~18.5 GHz信号的频率测量。研究表明，链路的信号增益实测结果与理论吻合，据此构造的幅度比较函数随频率变化更加剧烈，非常有利于实现准确的频率测量，获得了优于30 MHz的测量精度。而且，该方法较为简单，只需少量的常规器件即可实现，抗环境变化能力也得到提升。通过更换高频的调制器和光电探测器，可实现对更高波段信号的频率测量。
Instantaneous frequency measurement (IFM) is one of great important technologies in modern electronic warfare. The photon-assisted IFM technology was paid particular attentions due to its huge bandwidth, low loss, small size, light weight, as well as electromagnetic inference immunity, which can overcome the bottleneck of traditional electronic methods. In this paper, another approach using complementary radio frequency power response link, is put forward to measure the wideband signal in the range of 0.5 GHz~18.5 GHz basis on our previous work. The results show that the signal gain is consistent with that of theory. Then the amplitude comparison function with more steep slope, is derived to measure the unknown signal frequency, which can improve its accuracy. The experimental results indicate that the frequency measurement error is less than 30 MHz. Moreover, this method is very simple and just a few ordinary optical devices are needed. Meanwhile, it has favorable ability to adapt the environment. By replacing the modulator and photodetector with that of higher operation frequency, it can be easily extended to work for ultra-wide band signal measurement.