Radar sensor, automobile and target direction identification method

Abstract

The invention provides a radar sensor which comprises an optical transmitting unit and an optical receiving unit. The optical transmitting unit is used for transmitting a single laser beam and can divide the single laser beam into three laser beams, the optical receiving unit is used for receiving reflected target light echo signals of the three laser beams in a projection area, and consists of two optical receiving modules, and each optical receiving module is used for receiving the reflected target light echo signals of the corresponding two adjacent laser beams of the three laser beams in the projection area. Correspondingly, the invention further provides a target direction identification method implemented by the aid of the laser sensor and an automobile comprising the laser sensor. Compared with the prior art, the laser sensor is simple in structure and low in hardware cost, and targets within a large-range area in front of the automobile can be identified.

Description

technical field [0001] The present invention specifically relates to a radar sensor, a car including the radar sensor, and a method for identifying azimuth of a target. Background technique [0002] With the continuous improvement of people's requirements for safety and comfort during driving, radar sensors are widely used in cars. Radar sensors are generally used in automobiles to measure the orientation of other targets around the vehicle (that is, other vehicles, pedestrians and other obstacles), as well as the relative distance and relative speed between the vehicle and other surrounding targets, so as to measure the distance between the vehicle and other surrounding targets. When there is a risk of collision, the driver can be reminded to brake in time, and when the driver does not respond or an unavoidable collision occurs, the vehicle braking system can be notified in time to automatically perform the brake, so as to avoid collision or reduce the degree of collision. ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above situation, the prior art proposes a method of splitting a single laser beam generated by a single laser into three beams of laser light with a certain divergence angle, and projecting the three beams of laser light on three different fronts of the vehicle, namely left, center and right. space area in order to realize the scheme of detecting targets in a large area in front of the vehicle. The cost of this scheme is lower than that of laser non-scanning radar sensors. A single photodetector cannot identify the orientation of the target. Therefore, the radar sensor needs to use three condensing lenses and three corresponding photodetectors, and each condensing lens is used to receive the target return light signal of a laser beam and The target return light signal is focused on the corresponding photodetector to determine the orientation of the target

Although the cost of the radar sensor of this scheme is lower than that of the laser non-scanning radar sensor, it increases the complexity of the optical receiving unit of the radar sensor and the number of photodetectors, thus increasing the system cost

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