Overview

ALS50-II is a compact laser-based system designed for the acquisition of topographic and return signal intensity data from a variety of airborne platforms.

Key Features

Basic Design

What is included: The ALS50-II is a turn-key airborne LIDAR mapping system. ALS50-II systems include 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 and ALS50-II system configurations.

Configuration: ALS50-II systems are typically configured to include the following:

• large-aperture low-inertia/high speed scan mirror. The standard scan mirror is designed for use at altitudes up to 6000 m AGL at fields of view (FOVs) to 75 degrees.

• 4 range counting circuit cards (first, second, third, last)

• return signal intensity/AGC setting capture card (first, second and third return intensities plus AGC setting)

• integral XGA-resolution (1280 x 1024 pixels) digital camera with automatic data annotation

Accessories

Ground Power Supply: The ALS50-II normally operates on 28 VDC. For ground operations, a ground power supply is provided which allows operation of the system from standard AC (110/220 VAC) mains.

Standard Components

The ALS50-II system consists of the following physical assemblies:

• LS50 Scanner Assembly

• System Electronics (LC50 Laser Controller + SC50 System Controller)

• Interconnecting cables

• OC50 Operator Interface

• Vibration isolated interface plate assemblies for both scanner and electronics

• GPS antenna

•POS V4 with LN200 510 IMU

Trackair Nav System

Additional Software

The following software is included with the system:

Trackair: a proprietary mission planning template is provided to aid users in determining proper system set-up and flight line spacing.

GPS/IMU Processing Software: Combines GPS base station data with IPAS airborne GPS data to provide a DGPS aircraft position solution; combines the DGPS solution with Scanner Assembly IMU data to provide smoothed position and orientation data. This software also allows download of real-time (non DGPS) position and orientation data for “quicklook” processing.

ALS Post Processor: Assembles trajectory output from GPS/IMU processing software with raw scanner files into a master data file and processes the master data file into ground coordinates including latitude, longitude, elevation and intensity values.

• Gray-scale intensity image output (i.e., x/y/intensity bitmapped images).

Controls/Indicators

Adequate controls and indicators are provided to allow compliance with CDRH requirements.

Emission Indicator: A 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 output window.

Warning Buzzer: A CDRH-compliant warning buzzer is incorporated into the Scanner Assembly.

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.

Control Interface: The ALS50-II system is controlled via a graphical user interface (GUI) operating on the OC50 Operation Controller, a high-brightness airborne-qualified display with an accompanying rigidly-mounted compact weather-resistant keyboard. The GUI provides multiple modes for normal operation and test. In the normal operation mode, the GUI provides user selection of FOV, scan rate and range gates as well as control over stop/start functions of both laser and data logging. Normal operation mode GUI graphics include display of subsampled range, intensity, height-above-ground and percent return data and continuous monitoring of key subsystems for any error messages generated. In the test mode, the GUI provides the ability to operate and/or monitor key subsystems individually for diagnostic purposes. Test mode graphics also include data histogram and “strip chart” display of raw data for diagnostic purposes. GUI software is designed to run under Windows NT 4.0, 95, 98, 2000 or XP operating systems.

Operator Interface (OC50 + keyboard):

Depth (keyboard horizontal) 9.22” (234 mm)

Width 9.27” (235 mm)

Height (keyboard horizontal) 6.84” (174 mm)

Weight:

The maximum weight of ALS50-II components is as follows:

Scanner (NUS4 or DUS5 IMU, incl. cable) 79.5 lb (36.1 kg)

Scanner (on isolated interface plate assembly) 97.9 lb (44.5 kg)

System Electronics (incl. LC50 cable, no interface plate) 92.5 lb (42.0 kg)

System Electronics (on isolated interface plate ass’y) 100.3 lb (45.6 kg)

OC50 Operation Controller (with keyboard, bracket) 5.5 lb (2.5 kg)

OC50 Cable 1.8 lb (0.8 kg)

Total (maximum, fully isolated installation) 205.5 lb (93.4 kg)

Note: Add approximately 11.0 lb (5.0 kg) for systems equipped CUS6 IMU.

User Guide: A User Guide is provided with the delivered system. The Guide includes the following:

• Safety Data

• Unpacking instructions

• System description, including concept of operation and functional descriptions of subsystems

• Interfaces

• Installation instructions

• Operation instructions

• Post processing instructions, including boresight calibration

• Preventive maintenance instructions

• Trouble-shooting instructions

Safety

The system, when operated in accordance with instruction provided in the User Guide, is eye safe for single pulse exposure when viewed through binoculars by persons on the ground below the flying system. The system also meets all requirements of 21 CFR 1040.

Contact us at: nts@nts-info.com

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