微波频率测量是电子战系统的重要组成部分，电域频率测量方法存在系统体积大、功耗大、抗电磁干扰能力弱的问题，光辅助法频率测量存在大测量范围时低分辨率、高分辨率时小测量范围的问题。提出并实验验证了一种采用两个光偏振调制器的大范围高分辨率瞬时微波频率测量方法，该方法先在大范围低分辨率测量微波频率，再在小范围高分辨率测量微波频率。实验结果表明，该方法可在2.7~19.4 GHz范围内实现瞬时测频，分辨率优于±0.14 GHz。

Microwave frequency measurement is an important part of electronic warfare systems. The electric field frequency measurement method has disadvantages of bulky system volume, high power consumption and weak immunity to electromagnetic interference, and the light auxiliary frequency measurement method has defects of either wide frequency range with low-resolution or high-resolution in narrow measurement range. We propose and experimentally demonstrate an instantaneous microwave frequency measurement method with wide range and high resolution based on dual polarization modulation. This method measures in a large range of microwave frequency with a relatively low resolution, and then in a small range with high resolution. The experimental results show that this method can achieve instantaneous frequency measurement resolution better than ±0.14 GHz in 2.7~19.4 GHz range.