Light emitting unit, optical signal detection module, optical system and laser radar system

Abstract

The invention discloses a light emitting unit, an optical signal detection module, an optical system and a laser radar system. The light emitting unit comprises a light source subunit, a high frequency modulation subunit and a difference frequency subunit; the light source subunit emits an initial light beam; the high frequency modulation subunit modulates the frequency of the initial light beam via a photomixing technology, and emits at least two different frequencies of high frequency emission signals; the difference frequency subunit caries out difference frequency processing on two randomfrequencies of high frequency emission signals, and emits at least one type of low frequency emission signal; and at least one type of high emission signal and at least one type low frequency emissionsignal as detection light signals are emitted by the light emitting unit. Thus, the initial light beam emitted by the light source subunit is modulated via photomixing and difference frequency technologies, time for light beam modulation is shortened, the detection light signals are emitted at a higher speed, and the detection speed of the laser radar system is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of laser distance measurement, and in particular to a light emitting unit, an optical signal detection module, an optical system and a laser radar system. Background technique [0002] The lidar system is a radar system that emits a laser beam (detection light signal) to detect the target's position, speed and other characteristic quantities. The laser radar system can detect the relevant information of the target object, such as the target object's azimuth, distance, height, speed, attitude, and even shape parameters, so as to detect, track and identify the target object. The lidar system is an indispensable core sensor in the fields of automobile automatic driving, robot positioning and navigation, space environment mapping and security. In practical applications, according to different principles, lidar systems can be divided into: triangulation lidar system, pulse lidar system base...

AI Technical Summary

Problems solved by technology

[0003] However, at present, electrical components are used to modulate the frequency of the transmitted signal, the modulation speed of the transmitted signal is slow, and the electromagnetic interference is serious, which leads to the slow detection speed of the existing phase-based lidar system

Images