Three-dimensional solid-state laser radar detection method and device based on double optical frequency combs

Abstract

The invention discloses a three-dimensional solid-state laser radar detection method and device based on double optical frequency combs. The method comprises the following steps: two optical frequency combs with different repetition frequencies are modulated by using an intermediate frequency linear sweep frequency signal to obtain two sweep frequency optical frequency comb signals; one optical signal serving as a detection optical signal is sequentially sent to the Rotman optical lens comprising N input ports; the detection optical signals of different input ports are scanned on a plane, and the detection optical signal in each input port is scanned on a theta plane perpendicular to the plane through an optical antenna; the detection light signal is reflected back to the light antenna after encountering a target, coherent detection is realized by the detection light signal and another sweep frequency light frequency comb signal, and target three-dimensional space distribution and speed information can be obtained after signal processing; according to the three-dimensional solid-state laser radar detection device, through a frequency dispersion wave beam scanning technology, a Rotman optical lens wave beam direction control technology and a dual-optical-frequency comb coherent receiving technology, high-precision measurement of target three-dimensional space distribution and speed information can be realized without mechanical scanning.

Description

Technical field [0001] The present invention relates to a solid-state laser radar detection method, particularly to a three-dimensional solid-state laser radar detection method and apparatus based on dual optical frequency comb. Background technique [0002] Laser radar can achieve high-precision three-dimensional perception, widely used in automatic pilot, intelligent robots and remote sensing. Currently more developed multi-lidar system with mechanical scanning and detection technology acquisition target pulse time three-dimensional / two-dimensional spatial distribution of arrival information (see [T. Raj, F. Hashim, A. Huddin, etc, * # * A Surveyon LiDAR Scanning Mechanisms, * # * Electronics , Vol. 9, no. 5, pp. 741,2020.]). Since the complex mechanical structure of the rotating member, vibration resistance difference, easy to wear and other reasons, resulting in mechanical lidar limited life, installation and calibration process cumbersome, bulky, and thus are limited in co...

AI Technical Summary

Problems solved by technology

However, this solution requires a signal acquisition array and a photodetector array in the receiving part, resulting in a complex structure and high cost for large-scale multi-channel detection.

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