VQ-840-GL

Lightweight and Compact Topo-Bathymetric Airborne Laser Scanner with Online Waveform Processing and Full Waveform Recording

The RIEGL® VQ-840-GL is a fully integrated, compact airborne laser scanner for combined topographic and bathymetric surveying. The LiDAR system is now offered in a new design. Maintaining the proven form factor, the internal redesign and use of very lightweight material enables a reduced weight of less than 10 kg (22 lbs), making the VQ-840-GL even more suitable for UAV integration.

RIEGL | Innovation in 3D

Horn, AT

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Description

The scanner carries out laser range measurements for high resolution surveying of underwater topography with a narrow, visible green laser beam, emitted from a pulsed laser source. Subject to clarity, at this particular wavelength the laser beam penetrates water enabling measurement of submerged targets.
The distance measurement is based on the time-of-flight measurement with very short laser pulses and subsequent echo digitization and online waveform processing. To handle target situations with most complex multiple echo signals, beside the online waveform processing the digitized echo waveforms can be stored on the removable data storage card for subsequent off-line full waveform analysis.
The laser beam is deflected in an elliptic scan pattern and hits the water surface at an incidence angle with low variation.
The VQ-840-GL can be complemented with an inertial navigation sensor for subsequent estimation of the instrument’s location and orientation. As a further option a high-resolution digital camera can be integrated.
The rugged internal mechanical structure together with the dust- and splash water proof housing enables long-term operation on airborne platforms.

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Specifications

General: Year of introduction

2022

Total Weight [kg]

9.8

Power requirements

18-34 V DC, 110W

Type of GNSS/INS positioning system

optional

Camera

optional

Data storage facilities

CFAST, up to 240 GByte (optional)

Postprocessing software

RiACQUIRE, RiPROCESS, RiUNITE, RiHYDRO

Application: Main applications

• Coastline and Shallow Water Mapping • Surveying for Hydraulic Engineering • Hydro-Archeological-Surveying • River Surveying • Repeated Survey of Water Reservoirs

Measurement Characteristics: Scanning method

rotating scan mirror

Min. pulse frequency [Hz]

5000

Max. pulse frequency [Hz]

200000

Max. field of view [deg]

selectable, 3 up to 18 mrad

Operation Characteristics: Platform

Helicopter, Fixed-wing, Gyroplane, RPAS (UAV/UAS)

Min. flying height [m]

3

Max. flying height [m]

250

Laser Pulse Characteristics: Type/class laser

3B

More information: Distinguishable features

• designed for combined topographic and bathymetric airborne and UAV-based survey • high accuracy ranging based on echo digitization and online waveform processing with multiple-target capability • concurrent comprehensive full waveform storage for all measurements for subsequent full waveform analysis • high spatial resolution due to measurement rate of up to 200 kHz and high scanning speed of up to 100 scans/sec • integrated inertial navigation system (optional) • integrated digital camera (optional) • compact, lightweight and robust housing compliant with typical hatches in aircrafts and with stabilized platforms