Device and method for enhancing rotation Doppler effect signal under sunlight illumination

Abstract

The invention discloses a device and a method for realizing rotation Doppler effect signal enhancement under sunlight illumination, and relates to optical detection and signal processing. On the basis of multiband optical filtering, single photon detection and spectrum signal processing, partially coherent sunlight is used as an illumination light source and decomposed into a plurality of narrow-band light beams with specific wavelengths through optical filtering, and the narrow-band light beams are used for rotating Doppler effect measurement. The device comprises a sunlight collecting device, a shaping system, an optical filtering system, a rotating target object, an attenuation piece, a 50: 50 non-polarization beam splitter, a spatial light modulator, a single-photon detector, a Fourier transform signal processing unit, a data analysis module and the like. Sunlight is collected and shaped, light with different wavelengths is separated out through a filter and irradiates a rotating target, and transmitted light signals are modulated through an optical system and collected by a single-photon detector. Rotation Doppler signals are extracted through Fourier transform, and multi-band signal superposition processing is adopted to realize enhancement of the rotation Doppler signals.

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