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Laser radar ranging method, system and equipment

A technology of laser radar and ranging method, which is applied in the optical field, can solve the problem of large distance error of the measured object, and achieve the effect of improving the accuracy of ranging

Active Publication Date: 2019-08-27
SUTENG INNOVATION TECH CO LTD
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Problems solved by technology

[0004] However, the transmission signal generated by the transmission channel of the above-mentioned FMCW lidar system is generally nonlinear, which causes the frequency spectrum of the difference frequency signal obtained by the ranging channel to be broadened after the fast Fourier transform, resulting in the measured object obtained by the FMCW lidar system. large distance error

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  • Laser radar ranging method, system and equipment
  • Laser radar ranging method, system and equipment
  • Laser radar ranging method, system and equipment

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Embodiment Construction

[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0044] The laser radar ranging method provided in this application can be applied to unmanned driving scenarios, and can also be applied to other scenarios that require a laser radar system. Taking unmanned driving scenarios as an example, such as figure 1 As shown, the device 200 where the laser radar system is located can detect the distance between the target object 300 and the device through the laser radar 100; the above target objects can be but not limited to road obstacles, vehicles and pedestrians.

[0045] In one embodiment, such as figure 2 As shown, a lidar ...

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Abstract

The invention relates to a laser radar ranging method, system and equipment. A controller obtains a ranging intermediate frequency signal generated on a ranging channel of a laser radar system, and acalibration intermediate frequency signal generated on a calibration channel of the laser radar system; signal processing is carried out on the ranging intermediate frequency signal to obtain receiving intermediate frequencies corresponding to different moments, and signal processing is carried out on the calibration intermediate frequency signal to obtain calibration intermediate frequencies corresponding to different moments; and the equivalent number of the arm travel difference on the calibration channel is calculated according to the calibration intermediate frequencies corresponding to different moments and the receiving intermediate frequencies corresponding to different moments, and the distance between the laser radar system and a target detection object is calculated according tothe equivalent number of the arm range difference. By adopting the method, the ranging accuracy of the laser radar system can be improved.

Description

technical field [0001] The present application relates to the field of optical technology, in particular to a laser radar ranging method, system and equipment. Background technique [0002] As the most important navigation system in the intelligent driving system, lidar has been valued by major car companies. LiDAR propagates in space through the emitted laser light, and the reflected echo after touching the object is received by the LiDAR, and the distance measurement is performed by analyzing the optical information of the transmitted signal and the echo signal, so as to perceive and construct a three-dimensional physical image information. In the laser radar system, the frequency modulated continuous wave (Frequency Modulated Continuous Wave, FMCW) laser radar system uses a laser with a variable wavelength to emit continuous waves, and uses the frequency difference between the echo signal and the transmitted reference local oscillator signal to calculate the detection di...

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Application Information

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IPC IPC(8): G01S17/32G01S7/48
CPCG01S7/4808G01S17/34
Inventor 侯昌韬
Owner SUTENG INNOVATION TECH CO LTD