Based on electro-optic phase modulation broadband synthetic aperture imaging lidar

Abstract

This paper proposes a broadband synthetic aperture imaging lidar based on electro-optic phase modulation, which uses an electro-optic phase modulator to generate a series of broadband chirp signals after the narrow linewidth seed source laser passes through the phase modulator. The de-chirp method is used to achieve pulse compression, and by adopting analogy filters to filter out the interference of multiple harmonics, the near ideal de-chirp signal is attained. The experimental results show that when selecting the first-order sideband signal as the desired signal, we obtain a linear frequency modulated signal with a frequency modulated bandwidth of 3 GHz and a tuning rate of 10 THz/s, and it is achieved the resolution of 0.06 m in the range and 0.02 m in the azimuth.