Multi-beam linear frequency modulation pulse coherent laser three-dimensional imaging system and method

The invention discloses a multi-beam linear frequency modulation pulse coherent laser three-dimensional imaging system and method, and the system comprises a main control and display unit (17) which is in communication connection with a narrow linewidth laser (1), an optical fiber frequency shifter (3), an acoustic optical modulator (5) and a multi-channel data collection card (15); the first optical fiber beam splitter (4) is connected with the acousto-optic modulator (5) through an optical path, and the optical path of the signal light comprises the acousto-optic modulator (5), a second optical fiber beam splitter (6), an erbium-doped optical fiber amplifier (7) and an optical fiber circulator (8). Signal light becomes linear frequency modulation pulse light after linear frequency modulation and pulse modulation, the pulse light is irradiated to a target through an optical fiber array optical system after amplification and polarization analysis, target reflection light waves are received through the optical