Vehicle-mounted ranging laser radar system

Abstract

The invention discloses a vehicle-mounted ranging laser radar system. The vehicle-mounted ranging laser radar system is characterized in that the radar system is divided into a transmitting part and a receiving part; a single-chip microcomputer of the transmitting part sends pulses to a transmitting circuit, the transmitting circuit sends high-power narrow pulses to an emitting diode, the emitting diode emits a laser, the laser is split into three beams of light waves after passing through a diffraction grating, and front areas in three orientations are covered with the three beams of light waves; when the light waves encounter a target object in one area, part of the reflected laser is transmitted to a PIN transistor set through a receiving lens of the receiving part and then transmitted to a multiplexer after passing through a signal processing circuit, a certain channel is opened up by the multiplexer every certain time and allows echo signals in a certain orientation to pass through, and the signals which have passed through the channel are further transmitted to a timing chip. Because the structure is adopted, an existing scanning mirror system is replaced with the multiplexer, and the cost of the system is substantially reduced; the whole system is small in size and convenient to install.

Description

technical field [0001] The invention relates to the field of vehicle radar, in particular to a vehicle ranging laser radar system. Background technique [0002] At present, the laser ranging system widely used in automobiles can be divided into non-imaging laser radar and imaging laser radar. Non-imaging lidar determines distance based on laser beam travel time. Its working principle is: the laser pulse emitted from the high-power narrow-pulse laser is focused into a beam of a certain shape by the emitting objective lens, scanned left and right by the scanning mirror, emitted to the space, and irradiated on the vehicle or other targets in front, and the reflected light passes through The scanning mirror, receiving objective lens and return fiber are introduced into the photodiode in the signal processing device, and the target distance can be obtained by counting the time difference between the start pulse of the laser diode and the receiving pulse of the photodiode by usin...

AI Technical Summary

Problems solved by technology

However, due to the high cost of the scanning mirror system, the popularity of vehicle-mounted ranging lidar is restricted.

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