The V-Line Airborne Laser Scanner RIEGL

Transcription

1 Airborne Laser Scanner with Online Waveform Processing RIEGL VQ-48i high-accuracy ranging based on echo digitization and online waveform processing high laser repetition rate - fast data acquisition multiple target capability - unlimited number of targets perfectly linear scan lines compact, rugged and lightweight design electrical interfaces for GPS data string and Sync Pulse (1PPS) mechanical interface for IMU mounting integrated LAN-TCP/IP interface The V-Line Airborne Laser Scanner RIEGL VQ-48i provides high speed data acquisition using a narrow infrared laser beam and a fast line scanning mechanism. High-accuracy laser ranging is based on RIEGL s unique echo digitization and online waveform processing, which allows achieving superior measurement results even under adverse atmospheric conditions, and the evaluation of multiple target echoes. The scanning mechanism is based on a fast rotating multi-facet polygonal mirror, which provides fully linear, unidirectional and parallel scan lines. The RIEGL VQ-48i is a very compact and lightweight scanner, mountable in any orientation and even under limited space conditions on helicopters or UAVs. The instrument needs only one power supply and provides line scan data via the integrated LAN-TCP/IP interface. The binary data stream can easily be decoded by user-designed software making use of the available software library RiVLib. Typical applications include Corridor Mapping Power Line Inspection Cultural Heritage Mapping visit our website Airborne Laser Scanning

2 Technical Data RIEGL VQ -48i Laser Product Classification Class 1 Laser Product according to IEC682-1:27 The following clause applies for instruments delivered into the United States: Complies with 21 CFR 14.1 and except for deviations pursuant to Laser Notice No., dated June 24, 27. Range Measurement Performance Measuring Principle time of flight measurement, echo signal digitization, online waveform processing, multiple-time-around-processing Laser Pulse Repetition Rate PRR 1) khz 1 khz 2 khz 3 khz 4 khz khz Effective Measurement Rate (meas./sec.) 1) 2) ) 4) Max. Measuring Range natural targets 2 % 13 m 9 m 6 m m m 4 m natural targets 6 % 21 m 1 m 11 m 9 m 8 m 7 m Max. Operating 1) 2) 1 m 7 m m 4 m 4 m 3 m (34 ft) (24 ft) (18 ft) (14 ft) (13 ft) (1 ft) Max. Number of Targets per Pulse practically unlimited (details on request) 1) Rounded values. 2) Reflectivity 2%, ±3 FOV, additional roll angle ±. 3) The following conditions are assumed: target larger than the footprint of the laser beam, perpendicular angle of incidence, visibility 23 km, average ambient brightness. 4) Ambiguity to be resolved by post-processing with RiMTA software. Minimum Range ) 7) Accuracy 2 6) 7) Precision 2 1) 8) Laser Pulse Repetition Rate up Max. Effective Measurement Rate 1) Echo Signal Intensity Laser Wavelength Laser Beam Divergence 9) Laser Beam Footprint (Gaussian Beam Definition) ) Accuracy is the degree of conformity of a measured quantity to its actual (true) value. 6) Precision, also called reproducibility or repeatability, is the degree to which further measurements show the same result. 1 m mm mm to khz up to 27 meas./sec. (@ khz PRR & 6 FOV) for each echo signal, high-resolution 16 bit intensity information is provided near infrared.3 mrad 31 1 m, 7 2 m, 1 m 7) One 1 m range under RIEGL test conditions. 8) User selectable. 9) Measured at the 1/e 2 points..3 mrad corresponds to an increase of 3 mm of beam diameter per 1 m distance. Scanner Performance Scanning Mechanism rotating polygon mirror Field of View (selectable) 6 (+3 / -3 ) Scan Speed (selectable) 1-1 scans/sec Angular Step Width (selectable).2.36 between consecutive laser shots Angle Measurement Resolution.1 Internal Sync Timer for real-time synchronized time stamping of scan data Scan Sync (optional) scanner rotation synchronization Data Interfaces Configuration LAN 1/1/1 Mbit/sec Scan Data Output LAN 1/1/1 Mbit/sec, USB 2. GPS-System Serial RS232 interface for data string with GPS-time information, TTL input for 1PPS synchronization pulse Mechanical Interfaces Mounting of the Laser Scanner Mounting of IMU sensor mounting base block (with 8 x M8 thread inserts and 6x mounting slots) 3 x M6 thread inserts in the front and rear plate (rigidly coupled with the internal mechanical structure) General Technical Data Power Supply Input Voltage Current Consumption Main Dimensions Weight Humidity Protection Class Max. Flight Altitude (operating) Max. Flight Altitude (not operating) Temperature Range V DC typ. 6 W 36. x 219 mm (length x diameter) approx. 11. kg max. 8 % non +31 C IP64, dust and splash-proof 16 ft ( m) above MSL 18 ft ( m) above MSL -1 C up to +4 C (operation) / -2 C up to + C (storage) 2

3 Maximum Measurement Range & Point Density RIEGL VQ -48i Maximum Measurement Range PRR = khz : no ambiguity / 1 transmitted pulse in the air PRR = 1 khz Operating PRR = khz ft 1 ft 1 ft 7 ft PRR = 1 khz 7 ft (213 m) 1 ft (3 m) 1 ft (47 m) 3 ft (178 m) 28 m 1232 m VQ-48i at, pulses/second Altitude = 1 ft AGL, Speed = 6 kn Resulting Point Density ~ 1.6 pt/m² Maximum Measurement Range : no ambiguity / 1 transmitted pulse in the air : 2 transmitted pulses in the air PRR = 2 khz Operating ft 1 ft 1 ft 7 ft PRR = 2 khz 7 ft (213 m) 1 ft (3 m) 1 ft (47 m) 2 ft (762 m) 28 m 88 m VQ-48i at 1, pulses/second Altitude = 2 ft AGL, Speed = 6 kn Resulting Point Density ~ 1.9 pt/m² Maximum Measurement Range Operating ft 1 ft 7 ft ft ft (12 m) 7 ft (213 m) 1 ft (3 m) 18 ft (49 m) m : no ambiguity / 1 transmitted pulse in the air : 2 transmitted pulses in the air VQ-48i at 2, pulses/second Altitude = 18 ft AGL, Speed = 6 kn Resulting Point Density ~ pt/m² The following conditions are assumed for the Operating ambiguity resolved by multiple-time-around (MTA) processing & flight planning average ambient brightness target size laser footprint roll angle +/- scan angle 6 3

4 Maximum Measurement Range & Point Density RIEGL VQ -48i PRR = 3 khz PRR = 3 khz Maximum Measurement Range : no ambiguity / 1 transmitted pulse in the air : 2 transmitted pulses in the air MTA Operating ft 1 ft 7 ft ft ft (12 m) 7 ft (213 m) 1 ft (3 m) 1 ft (47 m) m VQ-48i at 3, pulses/second Altitude = 1 ft AGL, Speed = 6 kn Resulting Point Density ~ 13 pt/m² Maximum Measurement Range PRR = 4 khz : no ambiguity / 1 transmitted pulse in the air : 2 transmitted pulses in the air MTA3: 3 transmitted pulses in the air MTA PRR = khz Operating PRR = 4 khz ft 8 ft ft PRR = khz 3 ft 3 ft (92m) ft (12 m) 8 ft (244 m) 13 ft (396 m) 16 m 282 m 47 m VQ-48i at 4, pulses/second Altitude = 8 ft AGL, Speed = 6 kn Resulting Point Density ~ 23 pt/m² Maximum Measurement Range MTA MTA Operating ft 7 ft ft 3 ft 3 ft (92 m) ft (12 m) 7 ft (213 m) 1 ft (3 m) 16 m : no ambiguity / 1 transmitted pulse in the air : 2 transmitted pulses in the air MTA3: 3 transmitted pulses in the air MTA4: 4 transmitted pulses in the air VQ-48i at, pulses/second Altitude = 1 ft AGL, Speed = 6 kn Resulting Point Density ~ 2 pt/m² The following conditions are assumed for the Operating ambiguity resolved by multiple-time-around (MTA) processing & flight planning average ambient brightness target size laser footprint roll angle +/- scan angle 6 4

5 Dimensional Drawings RIEGL VQ -48i

6 Example for a profile of scan data processed in MTA zones 1 to 4 Multiple-time-around Data Acquisition and Processing In time-of-flight laser ranging a maximum unambiguous measurement range exists, which is defined by the laser pulse repetition rate and the speed of light. In case the echo signal of an emitted laser pulse arrives later than the emission of the subsequently emitted laser pulse, the range result becomes ambiguous - an effect known as Multiple-Time-around (MTA). The RIEGL VQ-48i allows ranging beyond the maximum unambiguous measurement range using a sophisticated modulation scheme applied to the train of emitted laser pulses. The dedicated post-processing software RiMTA provides algorithms for multiple-time-around processing, which automatically assign definite range results to the correct MTA zones without any further user interaction required. Example for a profile of scan data processed in MTA zones 1 to 4 Information contained herein is believed to be accurate and reliable. However, no responsibility is assumed by RIEGL for its use. Technical data are subject to change without notice. RIEGL Laser Measurement Systems GmbH, 38 Horn, Austria Tel.: , Fax: , office@riegl.co.at RIEGL USA Inc., Orlando, Florida 32819, USA Tel.: , Fax: , info@rieglusa.com RIEGL Japan Ltd., Tokyo 16413, Japan Tel.: , Fax: , info@riegl-japan.co.jp RIEGL VQ-48i, 1/2/213