Accession Number : AD1032964

Title :   GEA CRDA Range Data Analysis

Descriptive Note : Technical Report

Corporate Author : MIT Lincoln Laboratory Lexington United States

Personal Author(s) : Bernard,Lorraine E ; Abbot,R I

Full Text :

Report Date : 28 Jul 1999

Pagination or Media Count : 83

Abstract : MIT Lincoln Laboratory has entered into a Cooperative Research and Development Agreement (CRDA) with the owners/operators of 14 geosynchronous satellites that have potentially close encounters with Telstar 401, which is a drifting geosynchronous satellite in the geopotential well extending from 97-113 degrees West longitude. The CRDA partners are GE Americom, PanAmSat, SatMex, and Telesat Canada. This effort, in part, involves maintenance of orbits for both the CRDA partner satellites and Telstar 401. The operational aspects of this orbit support are documented in another report [1]. The Millstone Hill radar, operated by Lincoln Laboratory and located at Westford, Massachusetts, has been the primary resource of tracking data for Telstar 401 and the CRDA partner satellites. Millstone is an L-band (1295 MHz) radar with an 84-foot steerable dish. It measures four observables: range, range rate, azimuth, and elevation. The accuracies of these metrics are 5 m or better in range, 5 mm/s or better in range rate, and 5-10 mdeg in the angles. The Millstone radar is well calibrated by ranging to satellites for which very accurate orbits are derived independently using Satellite Laser Ranging data. Orbit accuracy achievable with Millstone alone measurements of geosynchronous satellites varies from0.5 to 2.0 km. A significant source of measurements also come from the Space Based Visible (SBV) sensor operated by Lincoln Laboratory. SBV is a visible-band, electro-optical camera combined with a 15-cm aperture telescope designed to gather metric and photometric information on a wide variety of resident space objects in support of space surveillance. SBV was launched into orbit in April 1996. It is in a nearly polar orbit with an altitude of 900 km. It measures right ascension and declination with accuracy of 1 mdeg (4 arc seconds). It typically takes tracks of 200 satellites per day operating on an 8 hour per day, 6-day per week schedule.

Descriptors :   space objects , space surveillance , geosynchronous satellites , calibration , tracking stations , monte carlo method , atmospheric refraction , l band , radar , electrooptics , detectors

Subject Categories : Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE