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All Categories > Airborne Scanners > VQ-820-G Laser Scanner with Online Waveform Processing > Item # VQ-580  
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VQ-820-G Laser Scanner with Online Waveform Processing


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VQ-820-G Laser Scanner with Online Waveform Processing

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Repetitive surveying of inshore waters is becoming more and more essential to evaluate reservoir sedimentation, river degradation, water flow and water level dynamics, structure and zone variations of rivers and riparian areas. This can only be achieved in an effective way by employing high-resolution hydrographic airborne laser scanning. The VQ-820-G Hydrographic Airborne Laser Scanner is specifically designed to survey seabeds or ground of rivers or lakes integrated into a Complete Platform for Airborne Scanning, simply installed in any type of aircraft platform, e.g. fixed wing or helicopter.

Laser range measurements for high resolution surveying of underwater topography, the bottom of shallow waters and riverbeds, are carried out with a narrow, visible green laser beam at 532 nm, emitted from a powerful laser source. Depending on water turbidity this particular laser wavelength allows measuring into water.

To handle target situations with complex multiple echo signals, the RIEGL VQ-820-G gives access to detailed target parameters by digitizing the echo signal and performing RIEGL's highly developed online waveform processing.


 Features  Specifications  Applications  Range Measurement Performance  Scanner Performance  Data Interfaces   Mechanical Interfaces  

Measuring Principle1

Time-of-flight measurement, echo signal digitization, online waveform processing

Max. Measuring Range2

2000 m, natural targets ρ ≥ 20%
3000 m, natural targets ρ ≥ 60%

Max. Operating Flight Altitude AGL3

600 m (1970 ft.)

Max. Number of Targets per Pulse

Practically unlimited (digitized waveform processing)

Minimum Range

10 m

Accuracy4

25 mm

Precision5

25 mm

Laser Pulse Repetition Rate6

up to 250 kHz

Max. Effective Measurement Rate7

up to 110000 meas./sec. (@ 250 kHz PRR & 42º FOV)

Echo Signal Intensity

For each echo signal, high-resolution 16 bit intensity information is provided

Laser Wavelength

Green

Laser Beam Divergence

1.0 mrad

Laser Beam Footprint (Gaussian Beam Definition)

100 mm @ 100 m
1000 mm @ 1000 m
1 Rounded values
2 Rounded values.
Reflectivity ρ ≥ 20%, ±42º FOV, additional roll angle ±5º.
The following conditions are assumed; target larger than the footprint of the laser beam, perpendicular angle of incidence. visibility 23 km, average ambient brightness.
In bright sunlight the operational range may be considerably shorter than under an overcast sky.
Ambiguity to be resolved by post-processing with RiMTA software.
3 Reflectivity ρ ≥ 20%, ±42º FOV, additional roll angle ±5º.
4 Accuracy is the degree of conformity of a measured quantity to its actual (true) value
One sigma @ 150 m range under RIEGL test conditions.
5 Precision, also called reproducibility or repeatability, is the degree to which further measurements show the same result.
One sigma @ 150 m range under RIEGL test conditions.
6 Rounded values.
User selectable.
7 Rounded values

 DOWNLOADS 

width= VQ-820-G
(PDF, 1152KB)

width= Sys. Config.
(PDF, 634KB)

width= Coastal Mapping
(PDF, 805KB)

width= RiPROCESS
(PDF, 515KB)

width= RiWORLD
(PDF, 500KB)

width= RiMTA
(PDF, 510KB)

width= RiWaveLIB
(PDF, 630KB)

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