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Equipment and Technical Data
68I Harrier LIDAR system


The system is an advanced Harrier 68I mapping system scan, which emits pulses of up to 400kHz to generate extremely dense point clouds, all in combination with ortho-georeferenced images of high quality.

The LIDAR sensor is integrated with the navigation unit with the highest accuracy on the market, IMU - Inertial Movement Unit, capable of detecting the angular variations of the aircraft (roll, pitch, yaw) at infinitesimal, is also connected to a GPS antenna This allows you to correct the movement caused by the aircraft and its geographical position. Addition is accompanied by a computer module that processes and stores the data obtained during the execution of the aero-lift missions through automated FMS flight management, while integrating direct georeferencing data and calibration of the LIDAR sensor .

The Harrier 68I sensor is connected to a storage unit LIDAR data, called Data Recorder, and a laptop that is used to control the various systems of the module. It also incorporates an LCD screen installed in the aircraft cabin to direct the flight path on the route established by a flight plan.

This system has a Riegl LMS-Q680i laser, which sends pulses of nanoseconds to the field differences, calculating the return times of the multiple echoes that is capable of receiving, in this way generates an uprising by a cloud of points. Together, for data collection, has an operational altitude range between 30 and 2400 meters above ground level and a precision of 2 [cm], ie, the smallest variation in height of an object that can capture is of 2 inches.

It also has a high capacity camera, which captures images at 60 mega pixels, and these are geometrically and radiometrically consistent.
Thus, the system H68i, together with a wide-angle wave up to 60 °, ability to detect multiple echoes of the signal, the camera's high quality, direct georeferencing and flight management major, he is transformed into the solution ideal for mapping large areas, power lines, pipe lines, etc.. In addition to its compact and lightweight format, allowing installation in small aircraft and even helicopters, made it to where required.

The method used is especially important when dealing with lifting tasks by classification of points, such as:

- Generating map
- Generation of polygons in map-based SHP
- Classification of cloud points, objects and floor
- Generating Topographic Maps
- PLSCAD
- Surface models
- Terrain Models

 

Density of points 

Figure 4 Survey image with a pulse frequency of 400 kHz.

 
 
Equipment Technical Information
 
 
Laser Sensor
Scanning Mechanism
Revolving Polygon
Pulse Frequency
80 kHz - 400 kHz
Field of view (angular)
45 ° - 60 ° (max.)
Measuring frequency
266 kHz @ 60 ° 200 kHz @ 45 °
Density of points
1 to 20 / m 2 (depending on the speed, height and frequency in flight)
Operating Altitude
30m AGL - AGL 2,400
Maximum height of flight
23,000 feet (~ 7000 meters ASL)
Divergence of the pulse
≤ 0.5 mrad
Capture range
Complete digitization of the wave
Capture intensity
16bit dynamic range for each echo
Scanning Frequency
10 Hz to 200 Hz
Safety Class
Class 3R
Sweep width
83% of the operational altitude
Range resolution
0020 meters
Vertical Accuracy (altimeter)
<0.15 meters
Horizontal Accuracy (planimetric)
<0.25 meters
Scan Pattern
Parallel Lines
Temperature
0 ° C to 40 ° C (Operating) -10 ° C 50 ° C (storage)
Moisture
0% to 85% (no condensation)
Weight
42 kg
Dimensions
30 x 64 x 48
 
Metric Digital Camera
Operating Altitude
Unlimited
Maximum height of flight
23,000 feet (~ 7000 meters ASL)
Field of View
Angle between 50mm and 60mm lens
Resolution
60 Mega pixels
FMC
Integrated
Exposure Period (max.)
2.8 seconds
Pixel size
0.03 meters
Image Scale
1:250 to 1:10,000
Calibration
Geometric and Radiometric