Solid-state laser radar detection method and system based on cyclic frequency shift ring

Abstract

The invention discloses a solid-state laser radar detection method based on a cyclic frequency shift ring, and the method comprises the steps of: transmitting a narrow-band swept-frequency optical signal to the cyclic frequency shift ring to obtain a broadband swept-frequency optical signal, dividing the broadband swept-frequency optical signal into two paths, taking one path as a reference optical signal, and transmitting the other path to a dispersion unit through an optical collimating mirror; controlling different-frequency swept-frequency sub-signals of the broadband swept-frequency signal to sequentially point to different directions in a free space by the dispersion unit to obtain a series of detection optical signals pointing to different directions; reflecting the detection lightsignalback to the dispersion unit after encountering a target, receiving the detection optical signals by the optical collimating mirror, and performing combination with the reference optical signal to form a path of to-be-detected optical signals; and conducting photoelectric conversion and signal acquisition on the to-be-detected optical signals, then acquiring target space distribution information based on a signal processing algorithm. The invention also discloses a solid-state laser radar detection system based on the cyclic frequency shift ring, and the system can achieve the high-precision measurement of a target angle and distance information at the same time through the optical cyclic frequency shift and optical wavelength dispersion technologies.

Description

Technical field[0001]The invention relates to a solid-state laser radar detection method, in particular to a solid-state laser radar detection method and system using a cyclic frequency shift ring and wavelength (frequency) dispersion technology.Background technique[0002]Lidar is widely used in fields such as autonomous driving, intelligent robots, and three-dimensional sensing. In order to obtain the three-dimensional / two-dimensional spatial distribution information of the detection scene / target, the current lidar system mostly uses mechanical scanning to realize the spatial two-dimensional / one-dimensional scanning of the laser beam, so as to obtain the target angle information, and obtain the target based on the pulse time arrival technology Distance information (see [J.Liu,Q.Sun,Z.Fan,Y.Jia,,"TOF Lidar Development in AutonomousVehicle,"IEEE 3rd Optoelectro-nics Global Conference,2018.]). However, due to the complex structure of mechanical components, easy wear, stability and limi...

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Problems solved by technology

However, due to the non-linearity and limited coherence length of the VCSEL-based sweeping source, this solution requires a more complex nonlinear correction circuit and a nonlinear correction algorithm to compensate for the nonlinearity. In addition, the detection distance is also limited.

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