Multi-line laser radar system for automobiles

Abstract

The invention discloses a multi-line laser radar system for automobiles, which is characterized in that a laser device, a spherical reflector and a parabolic reflector form a set of simple and effective beam shaping system to enable laser beams to be aligned in the horizontal direction and divergent in the direction of an optical axis of the system, an output light spot is a linear light spot, and the distance among a plurality of angle targets in the direction of a vertical axis can be detected by transmitting single pulses. The laser device generates linear beams used as radar scanning signals, the parabolic reflector is used for collecting echo signals of objects, the collected echo signals firstly pass through an optical filter and then incidence onto a photoelectric receiver array, and a motor drives a transmitting light path part and a receiving light path part to integrally rotate, thereby completing multi-line target scanning. In the invention, the linear beams are used as the radar scanning signals, the off-axis parabolic reflector is used for collecting the echo signals, and the photoelectric receiver array is used for receiving the echo signals. The multi-line laser radar system for the automobiles has the advantages of high detection efficiency, short light path, light weight, small volume and the like and is suitable for various automobiles.

Description

technical field [0001] The invention relates to an automobile multi-line laser radar device, which belongs to the application field of automobile auxiliary driving systems. Background technique [0002] With the development of society and economy, automobiles are becoming more and more common in life, and traffic accidents occur frequently. Driving on the road requires more attention, which increases the burden on drivers. The focus on car safety is not just for the driver and passengers, but for everyone else on the road. At present, safety equipment has moved from the physical field, such as the advancement of tire and brake technology, to the optoelectronic field, such as today's car assisted driving system. Assisted driving systems can provide basic safety functions, and more advanced designs can also use powerful sensors to identify surrounding traffic conditions, lanes and driving directions, and possible collision targets to alert drivers of potentially dangerous sit...

AI Technical Summary

Problems solved by technology

Because ultrasonic waves are greatly attenuated by atmospheric transmission, they generally do not exceed ten meters in application; microwave radar emits millimeter waves for active detection. Although it can achieve long-distance detection, it is mainly used for measuring the speed of objects, and it is difficult to measure the distance and position of objects. Accurate determination; automotive lidar overcomes the shortcomings of short distance and poor accuracy of other radars, and will be the best choice for automotive assisted driving systems

The current automotive lidar is mostly directional, fixed-point measurement or one-dimensional scanning. Although it can accurately measure distance and speed, it can only measure one target at a time. When performing multi-line measurement, it takes a long time to complete, and the speed cannot reach Meet the actual requirements, did not play its due function

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