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Airborne lidar pulse rate modulation

A laser pulse, airborne laser technology, applied in the direction of re-radiation of electromagnetic waves, utilization of re-radiation, measurement devices, etc., can solve problems such as affecting the quality of final products, waste of data storage space, etc., to improve eye safety conditions, high laser power , the effect of improving eye safety

Active Publication Date: 2019-07-30
LEICA GEOSYSTEMS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This type of scanning usually results in a varying distribution of points across the scanned strip
Uneven dot density may affect the quality of the final product
Also, there may be scan areas with unnecessarily high point density, resulting in wasted data storage space

Method used

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  • Airborne lidar pulse rate modulation
  • Airborne lidar pulse rate modulation
  • Airborne lidar pulse rate modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] figure 1 Shown is an aircraft 1 flying above the ground as a target 3 , the flight path 6 (trajectory) of the aircraft 1 , an airborne laser scanner 2 according to the invention arranged on the aircraft 1 , emissions emitted by the airborne laser scanner 1 The laser pulse 4 of the laser pulse, and the point cloud 5 of the strip of the aircraft 1 generated based on the laser pulse. The laser pulse emission pattern 4 is shown symbolically as a pyramid. But in reality, it's more like a cone or fan.

[0043] Figure 2a and Figure 2b Each symbolically shows an embodiment of the airborne laser scanner 2 according to the invention. Figure 2aAn airborne laser scanner 2 is shown comprising a computer 26, a transmitter 21 and a receiver 25, which in this example are combined in one unit, but could also be arranged separately. A prism 22 , in particular a wedge prism, is operatively connected as an optical element to a motor 24 such that it can be rotated about an axis of r...

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PUM

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Abstract

The invention relates to an airborne laser scanner configured to be arranged on an aircraft for surveying a target along a flight path, wherein the airborne laser scanner comprises an emitter configured for emitting a plurality of consecutive laser pulses towards the ground surface, at least one optical element configured for deflecting the laser pulses along pulse paths towards the target, a motor configured for altering the pulse paths by moving the optical element, a receiver configured for receiving the laser pulses backscattered from the target, and a computer configured for controlling the emitter, the motor, and the receiver, for determining directions of the pulse paths, and for triggering the emitter to emit the laser pulses with a varying pulse spacing based on the directional component of the pulse paths in a horizontal direction perpendicular to a direction of the flight path.

Description

technical field [0001] The invention relates to an airborne laser scanner according to the general term of claim 1 . Background technique [0002] Scanning of objects, such as the ground, with laser rangefinders for generating 3D point clouds and derivatives is usually achieved by moving, especially rotating or oscillating optical elements such as mirrors, wedge mirrors or prisms. [0003] This type of scanning typically results in a varying distribution of points across the scanned swath. Uneven dot density may affect the quality of the final product. Also, there may be scan areas with an unnecessarily high dot density, resulting in wasted data storage space. For oscillating or rotating scans, there will be significant build-up spots at the edges of the strips. [0004] Many LIDAR data filtering algorithms and filters rely on a certain point distribution to work optimally. [0005] Also, the stacking of pulses will generate many laser pulses that eventually overlap each...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/483G01S17/10G01S17/89G01S17/933
CPCG01S7/483G01S17/10G01S17/933G01S7/484G01S17/89G01S7/4817
Inventor K·奥尔特曼A·阿克塞尔松
Owner LEICA GEOSYSTEMS AG