ALS70-CM Product Specification
Contents
1. Leica ALS70 CM City Mapping Airborne LIDAR Product Specifications e when it has to be right Seica Geosystems Leica ALS70 CM Product Specifications Overview ALS70 CM is a compact laser based system designed for the acquisition of high density topographic and return signal inten sity data from a variety of airborne platforms at flying heights up to 1600 m AGL The data is computed using range and return signal intensity measurements recorded in flight along with position and attitude measurements from an airborne GNSS inertial subsystem The ALS70 CM falls into the category of airborne instrumentation known as LIDAR Llght Detection And Ranging This document establishes the minimum requirements for the ALS70 CM referred to as the system herein Basic Design Operating Principle By measuring the location latitude longitude and altitude and attitude roll pitch and heading of the aircraft the distance to ground and scan angle with respect to the base of the scanner housing a ground position for the impact point of each reflected laser pulse can be determined What is included The system is a turn key airborne LIDAR mapping system and includes all required airborne equipment needed for system operation The system includes all post processing software necessary to produce latitude longitude elevation intensity output and this software is designed to process output for a wide variety of ALS40 ALS50 ALS60 and AL2. nadir SPIA Z nadir 0 500 1000 1500 Flying Height m AGL 40 FOV Side Lobes The laser output beam does not have any side lobes outside the main beam Input Voltage See Environmental Requirements Input Power The system is designed to minimize damage due to out of range supply voltage Maximum average power draw is 937 2 Watts without the FWD option and 972 4 Watts with the FWD option Reverse Polarity Protection The system is designed to sustain accidental exposure to reverse polarity applied to the main power input The system will not operate under such a condition Laser Output Control The system provides control over laser output over an approximate 100 1 range Beam Uniformity The ratio of the laser s peak beam intensity to average beam intensity should not exceed 4 1 Warm Up Time The system is ready for use within 10 minutes of application of primary power Duty Cycle The system is capable of continuous operation at maximum pulse rate Recording capacity is defined below Leica ALS70 CM Product Specifications Design Requirements Laser Output Shutter The system has an integrated shutter allowing full output or complete obscuration of the output laser beam The assembly is remotely actuated using the graphical user interface software The assembly provides status signals to the system controller sufficient to allow confirmation of assembly position closed or open Emission Indicator A CDRH com
3. Integration Drawing SC70 LC60 The standard configuration for the System Electronics is a rackless 8U tall assembly on a vibration isolated interface plate assembly Mounting provisions are available on the top and bottom of the front and rear panel handles of the System Electronics for users wishing to install additional equipment e g the CC105 Camera Controller for RCD105 or CC31 Camera Controller for RCD30 The standard low profile interface plate 771406 can be used to allow vibration isolated mounting of the scanner plus up to 2 CH39 camera heads while the 785696 low profile interface plate assembly allows installation of either a single CH39 or single CH6x camera head Scanner Assembly Dimensions all IMUs Length no handles no interface plates Length parallel to flight direction with handles no interface plate Length no handles on 771406 isolated interface plate assembly Width no interface plate Width on 771406 isolated interface plate assembly Height no interface plate Height on 771406 isolated interface plate assembly System Electronics Dimensions Depth including handles cabling Width bare stack Width on 754141 isolated interface plate assembly Height bare stack Height on 754141 isolated interface plate assembly Operator Interface OC52 keyboard Depth keyboard horizontal Width Height keyboard horizontal Weight The maximum weight of system components is as follows Sca
4. to ALS70 HP configuration Recommended minimum slant range is 200 m Field of View FOV System FOV is adjustable over the range of 0 75 degrees in 1 degree increments Contact Leica Ge osystems for inquiries regarding maximum unvignetted FOV for installation in specific aircraft Scan Pattern The system provides 3 scan patterns all in a plane nominally orthogonal to the longitudinal axis of the scan ner nominally centered about nadir e Sinusoid scan with data collection on both left bound and right bound scans e Triangle scan with data collection on both left bound and right bound scans e Raster scan with unidirectional scanning Scan Rate Maximum scan rate degrades as a function of increasing FOV Maximum scan rates in Hz as a function of FOV in degrees full angle are defined in the following table Scan Pat Maximum scan rate function Bee L tern Hz mum Hz 2 11161387594222E 08 FOV 2 39640751412990E 05 FOV 4 85238584953128E s 03 FOV sinusoid 4 3 90365933090094E 01 FOV 1 51874883452176E 01 FOV 200z 3 53112587418088E 02 Triangle 1 28635419945581E 00 FOV 1 58293326854730E 02 158 Hz Raster 3 65199025243180E 04 FOV 5 91996857602394E 02 FOV 120 Hz 3 61365678536448E 00 FOV 1 20188139776174E 02 Leica ALS70 CM Product Specifications Scan rate maximum limits are summarized in the graph below 220 200 Sine 180 Triangle 160 Raster 140 120 1
5. 00 80 60 40 20 Max Effective Scan Rate Hz 0 20 40 60 80 Field of View degrees full angle The scan rate is user selectable from O to 200 Hz depending on scan pattern selected in 0 1 Hz increments via the graph ical user interface System control software prevents out of range inputs for scan rate based on user selection for FOV and scan pattern Roll Stabilization Automatic adaptive roll stabilization is provided Any portion of the maximum accessible 75 degree FOV that is not being used for the commanded FOV is available for automatic roll stabilization Illuminated Footprint Output beam divergence is 0 22 mr nominal measured at the 1 e point For reference this is equiv alent to 0 15 mr measured at the 1 e point Pulse Rate The maximum achievable pulse rate of the system is related to the maximum slant range setting The graph below summarizes maximum pulse rates at various flying heights assuming a 40 degree FOV Multiple Pulses in Air The system is equipped with a Multiple Pulses in Air MPiA feature which allows an increased max imum pulse rates over that offered by non MPiA systems for any given flying height The system can be operated in con ventional SPiA Single Pulse in Air or MPIA modes and the range accommodation envelope maximum slant range minus minimum slant range is the same in both MPiA and SPIA modes Maximum achievable pulse rate in each mode is shown in the graph below Target Detection Ra
6. 25 TY II CL 2 to resist corrosion The default vibration isolated interface plate assembly 753564 allows Scanner Assembly mounting directly to aircraft already equipped to accept Leica LH Systems Wild PAV series or other stabilized camera mounts The Scanner Assembly is designed so that no structures protrude below the air craft floor System Electronics The System Electronics are normally mounted using the included vibration isolated interface plate as sembly Optional mounting wings are available as an accessory to allow installation of system electronics in ElIA standard 19 inch racks Operator Interface The Operator Interface is designed for mounting to sturdy horizontal or vertical surfaces to the op tional IS40 mounting pedestal or to the optional PHT50 Holder Mounting for this assembly should be provided by the user in an appropriate fashion to minimize strain on the high density electrical connectors used for interface between the Sys tem Controller and the OC52 Operation Controller and to minimize movement of the assembly or cables when exposed to atmospheric turbulence during flight Environmental Requirements Specification Reference to Standard Environmental Test Index RTCA DO 160F Section 4 Cat B1 Max 40 C up to 2000 m AMSL or equivalent cabin pressure then declining at 6 6 C per 1000 m to max 26 8 C at 4000 m AMSL or equivalent cabin pressure then constant at max 26 8 C to 25000 feet 7620 m AMSL or equivalen
7. S Corridor Mapper and ALS70 configurations What is not included The user normally supplies the following e Survey grade dual frequency GNSS base station or equivalent accuracy reference station source e Mission planning and post processing computers a high end PC see separate Technical Note e Data archiving hardware software e Aircraft modified as needed including appropriate power outlet e Aircraft power outlet mating plug Accessories Ground Power Supply The system normally operates on 28 VDC For ground operations the PS56 Ground Power Supply is provided which allows operation of the system from standard AC 110 220 VAC mains Download Station A Download Station Assembly allows data transfer between the MM70 in flight storage media to the user s computer system via USB connection Standard Components The system consists of the following physical assemblies e LS70 LP Scanner Assembly e System Electronics LC60 Laser Controller SC70 CM System Controller e OC52 Operator Interface e OC50 Pilot Interface e Vibration isolated interface plate assemblies for both scanner and electronics e GNSS GLONASS antenna e Interconnecting cables LS70 LP Scanner Assembly The Scanner Assembly produces controlled movement of the transceiver aim point by galvanometer actuation of a scan mirror The aim point of the laser output relative to the scanner housing is measured by a high accuracy optical angle encoder The sca
8. can position signal provided by the System Controller Module to the galvanometer s actual position provided by the galvanometer s position detector DLM65 Data Logger Module The Data Logger Module stores output from both system controller and IPAS modules includ ing GNSS timing and position unprocessed IMU data range return signal intensity synchronization data and scanner posi tion information for later processing The data is stored on a removable solid state disc drive SSD Four removable SSDs are supplied with the system one in the SC70 CM System Controller and 3 additional SSDs for rotation from the field back to the processing center LC60 Laser Controller The Laser Controller provides power conditioning control and optical pump energy for the laser head located inside the Scanner Assembly PDM60 Power Distribution Module The power distribution module provides reverse polarity protection conducted EMI suppression and power connections to each SC70 CM functional module from a single DC input as well as providing regu lated DC power for the OC52 or OC50 operator and pilot interface and the LS70 Laser Scanner Leica ALS70 CM Product Specifications OC52 and OC50 Operation Controllers The OC52 and OC50 provide airborne qualified outdoor readable display platforms for operator interface and flight naviga tion software respectively The operator interface software provides a graphical user interface for system setup op
9. eration monitoring and flight navigation OC52 Operation Controller Primary input to the operator interface software is via the OC52 s large touch screen display and compact weather proof keyboard Both the OC52 display unit and the compact keyboard are mounted to a rugged bracket that provides optimal viewing angles for both display and keyboard The bracket provided allows mounting on hori zontal or vertical surfaces or on the optional IS40 pedestal or PHT50 holder OC50 Operation Controller The primary navigation display for the system is the OC50 The compact display with hot keys allows ready switching between available navigation views Software The following software is included with the system AeroPlan70 This proprietary mission planning template is a subset of Leica FPES Flight Planning and Evaluation Software and is provided to aid users in determining proper system set up and flight line spacing Flight Planning and Evaluation Software FPES Calculates optimal flight line layout and embeds layout and optimized system settings in a flight plan database file for transfer to system Flight and sensor Control Management Software FCMS Accepts flight plan database files from FPES and provides aided navigation for pilot and automatic or manual system operation for the system operator IPAS TC GNSS IMU Processing Software Combines GNSS base station data with IPAS airborne GNSS data to provide a DGNSS aircraft position solut
10. gth is dependent on the surface having adequate reflectivity and intercepting a sufficient portion of the laser footprint Targets intercepting less than the full laser footprint will require proportionally higher reflectivity for successful detection AGC Setting Capture The system digitizes the AGC value being used during detection of each return An 8 bit scale is used The captured AGC value can be used in combination with a Gain Based Intensity Correction GBIC table to produce high quality intensity images even while the system automatically adjusts detection sensitivity to optimal levels for accurate range measurement Accuracy The system produces data after post processing with a lateral placement accuracy of 5 38 cm and vertical placement accuracy of 7 16 cm one standard deviation from full field filling targets of 10 percent diffuse reflectivity or greater with atmospheric visibility of 23 5 km or better for flying heights up to 3500 m AGL SPiA mode and nominal FOV of 40 degrees Accuracy estimates for particular mission profiles i e flying height above terrain and position within FOV are shown below and can be provided in detail by using the AeroPlan70 mission planning template Estimates below are made assuming a 40 degree FOV DUS5 or CUS6 IMU and a nominal 5 cm GNSS error 20 men XY FOV edge XY nadir sal MIPIA Z FOV edge SPIA Z FOV edge Estimated Accuracy 1 sigma cm 3 5 MPiA Z
11. in both waveform collection and discrete return range measure ment modes IS40 Stand Provides a pedestal on which to mount OC52 or OC50 displays PHT50 Adapter Allows mounting of OC52 or OC5O displays to IS40 stands already having another display attached Leica ALS70 CM Product Specifications GI40 Guidance Indicator The compact GI40 Guidance Indicator provides a small dashboard mounted course deviation indi cator The GI40 can be used in addition to the OC50 Pilot Display for a more succinct heads up display It can also be used in place of the OC50 Pilot Display if available cockpit space is limited The GI40 features a blue LED display meeting worldwide illumination color requirements Technical Specifications Critical Item Definition The system consists of all hardware and software necessary to meet the specifications herein All assemblies are designed for rugged environments sustained on unpressurized light aircraft As such the system is capable of operation while being subjected to variations in temperature humidity and altitude experienced in flight In addition surfaces of the system ex posed during flight are capable of operation during exposure to precipitation and blowing dust Physical Requirements Size The system is within the following envelope dimensions as shown in drawings 766097 Integration Drawing LS70 LP Scanner w o RCD 766098 Integration Drawing LS70 Scanner w front mount RCD and 766099
12. ion combines the DGNSS solution with Scanner Assembly IMU data to provide smoothed posi tion and orientation data Post processed output features a tightly coupled solution allowing steep bank angles during turns This software also allows download of real time non differentially corrected position and orientation data for quick look processing ALS Post Processor ALSpp Assembles trajectory output from GNSS IMU processing software with raw scanner files into a master data file and processes the master data file into a ground coordinate point cloud including latitude longitude eleva tion and intensity values File output is in a variety of projections including WGS84 and UTM as well as in a variety of for mats including e ASCII XYZ in WGS84 and UTM coordinates worldwide as well as state plane coordinates in the USA All coordinate conversions are compatible with CORPSCON e LAS LAS 1 2 for standard discrete return data and LAS 1 3 for full waveform data e User required custom projections or geoid corrections Customers can provide the mathematical definitions for cus tom projections and or geoid models to Leica Geosystems for incorporation into ALSpp e Gray scale intensity image output i e x y intensity images in tif format Optional Components WDM65 Waveform Digitizer Module Allows capture of full waveforms from returned pulses WDM65 is integrated into the SC70 CM System Controller and allows parallel operation
13. nner max with CUS6 IMU incl IMU main cables Scanner on 771406 isolated assembly lo pro for LS 2x CH39 Scanner on 753564 isolated assembly for LS only 23 68 602 mm 26 68 678 mm 32 98 838 mm 14 50 369 mm 19 52 496 mm 10 05 255 mm 10 05 255 mm 24 50 622 mm 17 63 448 mm 19 52 495 mm 14 00 356 mm 16 14 410 mm 9 13 232 mm 11 89 302 mm 10 12 257 mm 92 6 Ib 42 1 kg 110 0 Ib 50 0 kg 111 1 Ib 50 5 kg Leica ALS70 CM Product Specifications Scanner on 756791 isolated assembly for LS 2x CH39 129 8 Ib 59 0 kg System Electronics incl LC60 cable no interface plate 104 5 Ib 47 5 kg System Electronics on isolated interface plate ass y 111 6 Ib 50 7 kg OC52 Operation Controller with keyboard bracket 7 8 Ib 3 6 kg OC50 Pilot 745210 3 3 Ib 1 5 kg OC52 Cable Qty2 1 8 Ib 0 8 kg each Total typical on 761406 236 3 Ib 107 4 kg Notes Subtract approximately 5 6 Ib 2 6 kg for systems equipped NUS5 IMU Subtract approximately 7 5 Ib 3 4 kg for systems equipped DUS5 IMU Mounting Scanner Assembly The Scanner Assembly is mounted to the aircraft using the included vibration isolated interface plate Mounting features are shown in drawings 766097 Integration Drawing LS70 LP Scanner w o RCD 766098 Integration Drawing LS70 LP Scanner w front mount RCD and 766099 Integration Drawing SC70 LC60 All mounting surfaces are black anodized per MIL A 86
14. nner is a sealed desiccated volume with a rigid optical window The following major components form the Scanner Assembly Leica ALS70 CM Product Specifications Laser Transmitter part of LC60 Laser Controller The laser transmitter produces output laser pulses using a diode pumped transmitter It also contains an optical trigger output shutter and beam expansion collimating optics that bring the dual laser outputs to the scan mirror Receiver The receiver collects a sample of the laser output pulse and detects laser pulses reflected by terrain below the aircraft Scanner Mechanization A high performance galvanometer scanner is used to actuate the scan mirror Mirror and Window Assembly Standard systems are shipped with a large aperture low inertia high speed scan mirror op timized for fields of view up to 75 degrees at altitudes to 3500 m AGL in SPIA mode allowing upgrade of the system to ALS70 HP configuration Digital Camera An XGA resolution 1280 x 1024 pixel digital camera is included in the scanner This integrated camera allows a real time view of the terrain below the aircraft as well as providing recorded images at fixed intervals The record ed images contain embedded annotation data Leica LCam Viewer software allows the user to search for a particular frame by GNSS time enabling selection of the appropriate frame for any given portion of the LIDAR mission and accesses the embedded annotation data in order to provide a
15. pliant laser emission indicator is provided on the underside of the Scanner Assembly When the Scanner Assembly is installed in the aircraft the emission indicator is readily visible from points below the scanner out put window Warning Buzzer A CDRH compliant audible warning indicator is incorporated into the Scanner Assembly Sighting Window A sighting window is provided on the Scanner Assembly The sighting window allows the user to view the condition of the scanner output window from inside the aircraft for evidence of fogging icing or gross contamination The sighting window provides high visible light transmission while providing attenuation of 1064 nm laser energy with an optical density of 6 0 or greater OS Installation Non mechanical drive OS Protection Protected from improper shutdown via EWF on Windows XPe Data Storage Removable SSD MM70 Recording Capacity The system has a nominal recording capacity of approximately 6 0 hours on single MM70 Mass Memory when operating at maximum pulse rate Capacity is proportionally longer at lower pulse rates Capacity is lower when using optional WDM65 Waveform Digitizer module and also depends on waveform rates and or waveform size Data drives can be swapped in flight after system shut down re start and in air GNSS IMU initialization Built In Test BIT The system has a BIT mode that provides simulated multiple return target signals to the range finding subsystem These signals allow sy
16. sing via the relief valve Desiccation is adequate to prevent fogging or condensation on the interior of the scanner housing when operated in the environments specified elsewhere in this document Post Processing Software Software is provided which processes raw data collected in the air and on the DGNSS base sta tion and produces an output data set in WGS84 coordinates Industry standard LAS format is used for output of the post processed data Post processing software is designed to run under all Microsoft Windows operating systems XP and higher 10 Leica ALS70 CM Product Specifications Documentation Test Report Each system is supplied with an outgoing test report Unless otherwise specified all data are provided at max imum pulse rate The test report provides at least the following information e Beam diameter 1 e and 1 e nominal at the exit aperture of the beam expander e Beam divergence 1 e and 1 e nominal e Pulse width Full Width Half Max e Maximum single pulse energy e Emitted wavelength e IMU offset boresight settings e Encoder and range calibration offsets including IBRC and GBIC files User Documentation A User Manual is provided with the delivered system This documentation includes the following e System Description e Installing the System e Care and Handling e System Operation e Safety Directions e Technical Data e Warranty Software License Agreement Proprietary information is s
17. stem self test of all range processing circuits Circuit Breakers Fuses Circuit breakers or fuses are provided to fuse primary power or limit damage due to an electrical fault inside major subassemblies The primary mains breaker is a 50A magnetic type breaker for accurate operation over a variety of ambient temperatures Hazardous Voltage Exposure When the system is installed in the aircraft no exposure to potentially harmful voltages is possible Electrical Connectors Connectors will not disconnect or become loose under the environmental conditions specified else where in this document during the service life of the equipment All connectors are keyed and or labeled where needed to prevent damage due to improper mating Strain Relief Interconnecting cables connected to the System Controller are restrained by two clamping assemblies on the System Controller rear handle in order to prevent damage An integral strain relief is provided where the main cable bundle enters the Scanner Assembly Retention for the remaining portions of the interconnecting cables must be installed by the end user in such a fashion as to prevent a tripping hazard in the aircraft Pressure Relief The Scanner Assembly features a pressure relief valve to prevent pressure or vacuum build up of more than 0 5 PSI differential Desiccation The Scanner Assembly has provisions for a disposable desiccant packet to remove moisture from any air enter ing the scanner hou
18. t pressure minimum O C at all altitudes Operating Temperature and Altitude Storage Temperature RTCA DO 160F Section 4 Cat B1 55 to 85 C Temperature Variation RTCA DO 160F Section 5 Cat B Humidity RTCA DO 160F Section 6 Cat B 0 85 RH Operational Shocks and Crash Safety Level 2 for all Fixed Wing Aircraft RTCA DO 160F Section 7 Cat E FAR 27 561 20g Types and Helicopter Vibration RTCA DO 160F Section 8 Cat S Magnetic Effect RTCA DO 160F Section 15 Cat B Power Input RTCA DO 160F Section 16 Cat B Leica ALS70 CM Product Specifications Voltage Spike RTCA DO 160F Section 17 Cat A Audio Frequency Conductive Pee RTCA DO 160F Section 18 Cat B Susceptibility Power Inputs Induced Signal Susceptibility RTCA DO 160F Section 19 Cat BC Radio Frequency Susceptibility x RTCA DO 160F Section 20 Cat RR Radiated and Conducted isa a Emissions of Radio Frequency Energy RTCA DO 160F Section 21 Cat M Lightning Induced Transient pa RTCA DO 160F Section 22 Cat A3E3X Susceptibility Insulation Resistance and High RTCA DO 160F Section 25 Cat A Voltage Performance Requirements Slant Range The recommended maximum slant range for the system is approximately 1848 m see graph describing maxi mum pulse rate for given flying height and SPiA MPiA configuration Systems can not be operated at longer slant ranges unless upgraded
19. t program including provisions for replacement parts and labor can be purchased Extended warranty provisions do not cover desiccant replacement and or customer damaged items 11 Whether you want to capture airborne data of an agricultural area or of a city record the challenges in a disaster area or the expanse of a high tension line you need reliable measurements and solutions for your entire workflow to build image based maps Leica Geosystems broad array of airborne sensors and integrated software solutions capture data efficiently reference imagery accurately measure easily analyze and present spatial information in 3D Those who use Leica Geosystems products every day trust them for their precision their seamless integration and their superior customer support When data really counts Leica Geosystems delivers geospatial imaging solutions with precision integration and service When it has to be right Illustrations descriptions and technical specifications are not binding and may change Printed in Switzerland Copyright Leica Geosystems AG Heerbrugg Switzerland 2008 785443en 1 12 RDV Leica G tems AG f a ae when it has to be right eca Heerbrugg Switzerland www leica geosystems com Geosystems
20. te The system is capable of detecting 90 of targets having at least 10 diffuse reflectivity and fully intercepting the laser footprint Return reflection for targets with less than 10 diffuse reflectivity may not produce ade quate signal strength and may result in drop outs The ability to measure range associated with a given return is depend ent on the surface having adequate reflectivity and intercepting a sufficient portion of the laser footprint Targets inter cepting less than the full laser footprint will require proportionally higher reflectivity for successful detection Multiple Target Detection The system is capable of detecting an unlimited number of returns for each outbound laser pulse provided each reflecting surface results in adequate signal strength for detection Vertical discrimination distance is approximately 3 5 m 600 500 400 300 200 ALS70 CM 2PiA 100 ALS70 CM 1PiA Max Effective Pulse Rate kHz 500 o So Flying Height m AGL 40 FOV 1500 Leica ALS70 CM Product Specifications Multi Return Intensity Systems are shipped with a multiple return intensity measurement feature With this feature the sizes of the reflected returns at various elevations up to the first three returns from each outbound pulse are measured in addition to the distances to each reflecting surface measured by the range counting cards An 8 bit scale is used The ability to digitize the signal stren
21. upplied at the discretion of Leica Geosystems All technical data shall remain proprietary to Leica Geosystems and is provided for the sole purpose of assisting in system usage and maintenance Upgrade Availability Upgrades are available from all ALS60 configurations including ALS Corridor Mapper ALS60 generation to all ALS70 configura tions Upgrade information is provided below ALS50 II and earlier systems including ALS50 II generation Corridor Mapper sys tems cannot be upgraded to any ALS 70 configuration FWD ready ALS60 to ALS70 CM Available as factory S ervice Center upgrade consult factory for ordering information Non FWD ready ALS60 to AL70 CM Available as factory Service Center upgrade consult factory for ordering information FWD ready ALS60 CM to ALS70 CM Available as factory Service Center upgrade consult factory for ordering information Non FWD ready ALS60 CM to ALS70 CM Available as factory Service Center upgrade consult factory for ordering information ALS70 CM to ALS70 HP Available as on site upgrade consult factory for ordering information Training Support and Maintenance Training Systems include three 3 one week training sessions at the customer s site to support installation operator training and processing technician training Additional training support is available on a fee for service basis Warranty One year on system and peripheral components Customer Care Packages CCPs An extended suppor
22. utomatic north up image orientation Zoom functions are also provided Interface plate A vibration isolated interface plate is provided to allow Scanner Assembly mounting to aircraft Specific interface plate selection will depend on installation type pod versus in cabin and standard versus low profile mounting and auxiliary sensor usage System Electronics The System Electronics assembly contains assemblies responsible for subsystem coordination raw data measurement and data recording The following major components make up the System Electronics SCM70 CM System Controller Module The System Controller Module controls laser operation measures range to ground via the high speed time interval counter measures the intensity of reflected return signals generates electrical signals needed to direct the optical scanner reads the encoded scan angle reads GNSS timing information and formats all these data for recording on a high speed data logger IPAS20 Inertial Position and Attitude System This subsystem provides and records master timing and aircraft posi tion attitude information using a GNSS receiver a high accuracy IMU mounted inside the scanner housing and an integral processor The IPAS subsystem records data via an Ethernet connection to the DLM65 Data Logger Module GCM60 Galvanometer Controller Module The Galvanometer Controller Module provides drive current to the scanner as sembly s galvanometer by comparing a commanded s
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