Wavelength tunable laser local oscillator optical synthetic aperture coherent imaging system and method

The invention provides a wavelength tunable laser local oscillator optical synthetic aperture coherent imaging system and method, and the system comprises a synthetic aperture telescope which is synthesized by a plurality of small-aperture sub-mirrors and is used for observing and receiving an infrared signal; the wavelength-tunable laser local oscillator is used for generating a laser local oscillator signal, mixing the infrared signal and the laser local oscillator signal, performing spectrum gating and narrow-band filtering on the infrared signal in an electronic radio frequency band, and subdividing an infrared spectrum to obtain a low-resolution complex image signal; the coherent array detector is used for performing photoelectric detection analog-digital sampling on the low-resolution complex image signals of the same infrared central wavelength received by the plurality of small-caliber sub-mirrors; and the computer module is used for coherently synthesizing the low-resolution complex image signals wit