Vehicle-mounted Doppler laser radar distance measuring method

A Doppler laser and distance measurement technology, which is applied in the field of vehicle-mounted Doppler lidar distance measurement, can solve problems such as inability to guarantee the transmission signal, and achieve the effect of miniaturization

Inactive Publication Date: 2015-06-24
WUHAN UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a vehicle-mounted Doppler laser radar distance measurement method, which mainly solves the problem that the miniaturization of the current laser radar lens cannot ensure that the length of the transmitted signal meets the requirements of high-speed scanning

Method used

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  • Vehicle-mounted Doppler laser radar distance measuring method
  • Vehicle-mounted Doppler laser radar distance measuring method

Examples

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Embodiment 1

[0052] Example 1: Using figure 1 The block diagram shown constitutes the vehicle lidar simulation platform. In order to ensure the requirements of imaging scanning, the length of the transmitted signal does not exceed 5μs, and the last 1μs is used to wait for the reflected signal from the 150m far reflector. According to the introduction of the background technology, when the diameter of the receiving lens is 1 mm, the received signal power is -60 dBm, and the received signal power needs to be increased by 20 dBm, so 100 pulses are placed within 4 μs before the transmitted signal.

[0053] According to the traditional scheme, 100 pulses are evenly placed in the first 4 μs on the time axis, and the receiving end processes the received reflected signals according to the traditional data accumulation method, and obtains the following Figure 4 (b) results. Figure 4 (a) is the received reflected signal, the signal is submerged in the noise, and the position of the received sign...

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Abstract

The invention discloses a vehicle-mounted Doppler laser radar distance measuring method. A pulse separation module stores the number of transmission pulses and pulse separation information. A drive module decides the laser activation pulse transmission time according to the pulse separation information. The laser transmission pulses are projected to a lens through a beam splitter 100-percent passing light path and transmitted to a target through the lens in a collimation mode. Optical signals reflected by the target are collected through the lens and arrive at a photoelectric converter through a beam splitter 100-percent reflecting light path. The optical signals are converted into electric signals through the photoelectric converter. A signal processing unit module carries out pulse position modulation processing on the electric signals generated by the photoelectric converter through the pulse separation information, and the distance of the target is worked out. The vehicle-mounted Doppler laser radar distance measuring method has the advantages that the transmission pulse separation is modulated and adjusted through the pulse position at a vehicle-mounted Doppler laser radar transmitting end, a receiving end measures the road target distance through an improved data integration method, and the miniature of vehicle-mounted laser radar is achieved while the length of transmitted signals meets the high-speed scanning requirement.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a vehicle-mounted Doppler laser radar distance measurement method. Background technique [0002] According to the 2010 "China Road Traffic Safety Blue Book", about 100,000 people die in automobile traffic accidents every year in my country, and nearly 500,000 people are injured in traffic accidents. About two-thirds of these traffic accidents are Caused by collision, loss of control and other factors. In order to reduce unnecessary losses caused by traffic accidents to people's lives and properties, automobile safety has been highly valued by governments around the world and major automobile manufacturers. Automotive safety systems include passive safety systems that can reduce losses after an accident, such as seat belts, airbags, etc., and assisted driving systems before an accident, such as ABS, navigation and positioning, anti-glare panels, and automatic parki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/10
CPCG01S17/10
Inventor 毛雪松黄龙张杰妮范良志
Owner WUHAN UNIV OF SCI & TECH
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