Echo signal amplification circuit of laser ranging system

A technology of echo signal and amplifying circuit, applied in the field of echo signal amplifying circuit, can solve the problems of complex implementation, high cost, rising cost of transmitting circuit, etc., and achieve the effect of simple circuit

Inactive Publication Date: 2014-09-03
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the amplifying circuit used for the echo signal of the pulsed laser ranging system mostly adopts the gain-adjustable amplifying circuit. The circuit cost rises, and the implementation is relatively complicated

Method used

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  • Echo signal amplification circuit of laser ranging system
  • Echo signal amplification circuit of laser ranging system

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Embodiment Construction

[0010] see figure 1 It can be seen that the present invention relates to the echo signal amplification circuit of the laser ranging system, which collects the echo reflected by the obstacle through the photodetector, and transmits the signal to the amplification and filtering circuit, and the amplification and filtering circuit then transmits the amplified signal to the The time measuring unit, wherein the amplification and filtering circuit sequentially includes a transimpedance amplification circuit, a high-pass filtering circuit, and a main amplification circuit along the direction of signal transmission. The components of the amplification and filtering circuit will be described in turn below.

[0011] see figure 2 It can be seen that the transimpedance amplifier circuit includes resistors R1, R2, capacitors C2, C3, C4, C5, C6, the first amplifier, PIN tube, the cathode of PIN tube P1 is connected to the -5V power supply through R1, and the anode is connected to the inver...

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Abstract

The invention discloses an echo signal amplification circuit of a laser ranging system. The echo signal amplification circuit is characterized in that echoes reflected from a barrier are collected by virtue of a photoelectric detector, are output to am amplifying-filtering circuit and are transmitted to a time measurement unit, wherein the amplifying-filtering circuit is sequentially provided with a transimpedance amplification circuit, a high-pass filtering circuit and a main amplification circuit along the transmission direction of signals. According to the echo signal amplification circuit, by utilizing an amplifier having characteristics of high bandwidth, signal to noise ratio and input impedance, photovoltaically converted echo signals cannot be submerged in noise; besides, the circuit is provided with the transimpedance amplification circuit and the main amplification circuit, the size of the gain is controlled by regulating a resistance value of a feedback resistor, and the circuit is relatively simple; compared with a gain-adjustable amplifier, for the circuit, a digital analog converter for inputting as well as other circuits are omitted.

Description

technical field [0001] The invention relates to the field of automobile active safety, in particular to an echo signal amplifying circuit of a laser ranging system. Background technique [0002] At present, laser ranging technology has been widely used in the field of automotive active safety. Among various ranging methods, pulsed laser ranging has the advantages of simple structure, long range and fast measurement speed, and has been widely used in many fields. The pulse laser ranging system transmits a light pulse to the target, which is received by the receiving circuit of the ranging system after being reflected by the target. The distance between the target and the target can be obtained by measuring the time from the emission of the light pulse to the return to the receiving circuit. The reception of the echo signal is generally composed of a photodetector and an amplification and filtering circuit. The amplification and filtering circuit is used to convert and ampli...

Claims

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Application Information

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IPC IPC(8): G01S7/483
CPCG01S7/4861
Inventor 段山保严伟徐海峰朱德亚
Owner CHERY AUTOMOBILE CO LTD
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