Accession Number : ADA532032


Title :   The Precision Expandable Radar Calibration Sphere (PERCS) With Applications for Laser Imaging and Ranging


Descriptive Note : Conference paper


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV


Personal Author(s) : Bernhardt, Paul A. ; Nicholas, Andy ; Thomas, Linda ; Davis, Mark ; Hoberman, Chuck ; Davis, Matt


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA532032


Report Date : SEP 2008


Pagination or Media Count : 10


Abstract : The Naval Research Laboratory will provide an orbiting calibration sphere to be used with ground-based laser imaging telescopes and HF radio systems. The Precision Expandable Radar Calibration Sphere (PERCS) is a practical, reliable, high-performance HF calibration sphere and laser imaging target to orbit at about 600 km altitude. The sphere will be made of a spherical wire frame with aspect independent radar cross section in the 3 to 35 MHz frequency range. The necessary launch vehicle to place the PERCS in orbit will be provided by the Department of Defense Space Test Program. The expandable calibration target has a stowed diameter of 1 meter and a fully deployed diameter of 10.2 meters. A separate deployment mechanism is provided for the sphere. After deployment the Precision Expandable Radar Calibration Sphere (PERCS) with 180 vertices will be in a high inclination orbit to scatter radio pulses from a number of ground systems, including (1) over-the-horizon (OTH) radars operated by the United States and Australia; (2) high power HF facilities such as HAARP in Alaska, EISCAT in Norway, and Arecibo in Puerto Rico; (3) the chain of high latitude SuperDARN radars used for auroral region mapping; and (4) HF direction finding for Navy ships. With the PERCS satellite, the accuracy of HF radars can be periodically checked for range, elevation, and azimuth errors. In addition, each of the 360 vertices on the PERCS sphere will support an optical retro-reflector for operations with ground laser facilities used to track satellites. The ground laser systems will be used to measure the precise location of the sphere within one cm accuracy and will provide the spatial orientation of the sphere as well as the rotation rate. The Department of Defense facilities that can use the corner-cube reflectors on the PERCS include (1) the Air Force Maui Optical Site (AMOS), (2) the


Descriptors :   *OVER THE HORIZON RADAR , *TELESCOPES , *ARTIFICIAL SATELLITES , SPACE SYSTEMS , RETROREFLECTORS , DIRECTION FINDING , OPTICAL IMAGES , LASERS , RADAR CROSS SECTIONS , COMMUNICATION AND RADIO SYSTEMS , CALIBRATION , AURORAE , GROUND BASED , AZIMUTH , HIGH LATITUDES , RADIOFREQUENCY , SYMPOSIA , HIGH FREQUENCY , IMAGE PROCESSING , OPTICAL PROPERTIES


Subject Categories : ASTRONOMY
      LASERS AND MASERS
      ELECTROOPTICAL AND OPTOELECTRONIC DEVICES
      OPTICAL DETECTION AND DETECTORS
      ACTIVE AND PASSIVE RADAR DETECTION & EQUIPMENT
      OPTICS
      UNMANNED SPACECRAFT


Distribution Statement : APPROVED FOR PUBLIC RELEASE