Accession Number : ADA302375

Title :   Power Subsystem Trade Studies for a 5 kW MEO Application.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS

Personal Author(s) : Thaller, L. H. ; Carter, B. J. ; Halle, L. F. ; Zimmerman, A. H.

PDF Url : ADA302375

Report Date : 01 DEC 1995

Pagination or Media Count : 41

Abstract : A technology trade study for a large generic MEO spacecraft has been carried out. The objective of the study was to address the main factors related to a modern, but not cutting edge, spacecraft power system capable of acceptable reliability over a 10-year mission. A typical MEO orbit mission passes through the earth's radiation belts and exposes the spacecraft to high levels of natuaal radiation. This affects the power system in two ways: (1) the solar array wili be large and heavy, and (2) the power system electronics (as well as other onboard electronic systems) must use radiation-hard parts. Radiation-hard electronics are expensive. The spacecraft was assumed to have onboard control functions with ground control as a backup. Where feasible, hardware items were recommended and manufacturers identified that already have an established ground-based data base, and where applicable, also have an established flight history. Following a review of the issues and trades, recommendations are presented, along with supporting data. The technology issues and options related to modern nickel hydrogen cell and battery designs are reviewed. Solar cell and array trades are carried out and recommendations made, as affected by radiation considerations. Mission optimization was not performed as part of this study, although The Aerospace Corporation regularly performs this task for U. S. Air Force satellite programs.

Descriptors :   *SOLAR CELLS, *STORAGE BATTERIES, *SPACECRAFT COMPONENTS, DATA BASES, REQUIREMENTS, OPTIMIZATION, EARTH ORBITS, STATE OF THE ART, GALLIUM ARSENIDES, ARRAYS, ELECTROCHEMISTRY, VOLTAGE, RELIABILITY, MISSIONS, ARTIFICIAL SATELLITES, ELECTRIC DISCHARGES, POWER SUPPLIES, PRESSURE VESSELS, LIFE CYCLES, SOLAR RADIATION, GERMANIUM, REDUNDANCY, ELECTRIC BATTERIES, RADIATION BELTS, HYDROGEN ELECTRODES.

Subject Categories : Electric Power Production and Distribution
      Electrochemical Energy Storage
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE