Laser scanner

A laser scanner and beam technology, applied in the field of laser scanner devices, can solve the problems of weak return pulse and only available under certain conditions.

Pending Publication Date: 2019-04-02
LEICA GEOSYSTEMS AG +1
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  • Claims
  • Application Information

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Problems solved by technology

However, in the case of weak return pulses, e.g. due to large measuring distances, it is no longer possible to detect the measuring signal as soon as the pulse strength falls below the set detection threshold
Thus, the fundamental disadvantage of this thresholding method is that the magnitude of the measu

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Embodiment Construction

[0088] figure 1 The application of the laser scanner device 1 of the invention in the field of autonomous vehicles is shown, where the road to be traveled is usually pre-recorded by a dedicated LiDAR module mounted on the vehicle 2 and the measurements are provided to a spatial model generator. In such a laser scanner 1 the horizontal field of view 3 (HFOV) is generally larger than the vertical field of view 4 (VFOV). A segment of the VFOV is called the instantaneous field of view (iFOV), where the acquisition rate for scanning the complete field of view may be approximately 25 Hz, for example.

[0089]Such systems usually require a robust design, and as such must often also be compact and, where possible, omit moving parts. Thus, MOEMS components ("Micro-Opto-Electro-Mechanical Systems") or adjustable or deformable refractive optical elements such as liquid lenses are frequently used as deflection elements. For example, optical phased arrays composed of ultra-thin liquid cr...

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Abstract

The invention relates to a laser scanner. The invention relates to a laser scanner device (1) adapted to be mounted to a vehicle (2), the device (1) comprising a LiDAR module working based on a lasermeasuring beam (5,26) and time-of-flight-measurement-principle, in particular using the technology of waveform digitizing. The LiDAR module is configured to provide a horizontal field of view (3) of at least 60 DEG, an instantaneous vertical field of view (17) of at least +- 2 DEG, a scan resolution of at least one point per 0.8 DEG in horizontal and vertical direction, and a frame rate of at least 10 Hz for scanning at least the entire horizontal (3) and instantaneous vertical (17) field of view with said scan resolution, wherein the LiDAR module comprises a multibeam transmitter configured for generating a plurality of measuring beams (5,26), particularly pulsed laser beams, defining a plurality of essentially instantaneous scanning axes (6).

Description

technical field [0001] The invention relates to a laser scanner device with a LiDAR (Light Detection and Ranging) module working based on TOF-WFD (Time-of-Flight Waveform Digitization). Background technique [0002] LiDAR based on TOF-WFD operation is well known in the art and is implemented, for example, in the scanning stations P20, P30 and P40 of the Leica Geosystems. [0003] In order for an autonomous vehicle to operate, it is preferable that the road is completely mapped in advance. This can be done by a dedicated car with some sort of scanner arrangement to scan and map the corresponding area. [0004] For use on such vehicles for mapping roadways, LiDAR modules have special requirements for the scanned field of view (FOV) combined with high frame rates. The horizontal field of view (HFOV) should be about 80°, while the vertical field of view (VFOV) can be quite small (about ±25°). An instantaneous vertical field of view (iVFOV) is also defined, which is scanned at...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01S17/93G01S17/931
CPCG01S17/89G01S17/931G01S17/42G01S7/4815G01S7/484G01S7/4817G01S7/4813G01S7/499
Inventor J·辛格L·海泽尔J·舍加S·马克J·辛德林B·伯克姆
Owner LEICA GEOSYSTEMS AG
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