Accession Number : ADA293477

Title :   Assessment of the NASA Evolve Long-Term Orbital Debris Evolution Model.

Descriptive Note : Final rept. Apr 91-Jun 92,

Corporate Author : ORION INTERNATIONAL TECHNOLOGIES INC ALBUQUERQUE NM

Personal Author(s) : Yates, K. W. ; Jonas, F. M.

PDF Url : ADA293477

Report Date : FEB 1995

Pagination or Media Count : 159

Abstract : The EVOLVE long-term orbital debris evolution model developed for the NASA Johnson Space Center by Lockheed Engineering and Sciences Company and Systems Planning Corporation is described and evaluated in detail. This computer model calculates the low earth orbit (LEO) debris spatial number density or flux environment as a function of fragment size, altitude, and time. Launched intact objects, introduced from detailed manifest databases, are time-evolved with an analytical orbit propagator. Debris clouds, formed from the application of cloud formation algorithm and breakup model, are time-evolved using a derived phenomenological function. This report describes the overall computer model (e.g., its deterministic and stochastic modes of calculation) and examines the individual submodels used to quantify the debris population in LEO. Model results are compared to observed debris data. Specific recommendations and possible model improvements are cited. Also presented is a sample satellite constellation hazard assessment using EVOLVE. (MM)

Descriptors :   *DEBRIS, *EARTH ORBITS, *SPACE ENVIRONMENTS, COMPUTER PROGRAMS, CLOUDS, MONTE CARLO METHOD, DECAY, SPACE OBJECTS, COLLISIONS.

Subject Categories : Meteorology
      Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE