Simultaneous Radar Detection and Microwave Frequency Measurement Based on Microwave Photonics

Incorporating radar and electronic warfare functions within a single system is highly desirable in modern military applications. Two photonics-based integrated systems that can simultaneously implement radar detection and microwave frequency measurement are presented in this paper. In the presented systems, the dual functions share a common linear frequency-modulated (LFM) waveform which is coupled with de-chirp receiving to realize the radar function and is acted as swept-tuned local reference to implement frequency measurement. Meanwhile, microwave photonic frequency multiplication is applied to broaden the bandwidth of the radar transmit signal and the frequency measurement range. The difference between the two systems lies in the way to multiplex the LFM waveform. In the first way, the radar and the frequency measurement functions occupy the ±1st-order and the 3rd-order sidebands of a light modulated by a LFM signal,respectively. While in the second way, the two functions multiplex a light with ±2nd-order LFM sidebands along orthogonal polarization directions. Finally, the feasibility and the performance of the presented systems are both experimentally demonstrated and tested.

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