An Updated Empirical Density Model for Predicting Low-Altitude Satellite Ephemerides.

Abstract

Two empirical density models based on drag analyses of 22 low-perigee satellites are developed for use in predicting low-altitude satellite ephemerides. A stepwise multiple regression analysis is performed with density at 145 km as the dependent variable, and a number of independent variables chosen to represent variations with solar cycle, geomagnetic activity, latitude, season, day of the year, and time of day. Densities between 120 and 500 km are determined from the hydrostatic law in a simple (but physically realistic) analytic form. The two models compare very well with the 1971 Jacchia model. The main advantage of such models is that they represent a major savings in both computer storage and run time making possible improvements in operational systems.

Document Details

Document Type
Technical Report
Publication Date
Mar 19, 1975
Accession Number
ADA010424

Entities

People

  • Henry B. Garrett

Organizations

  • Air Force Cambridge Research Laboratories

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Altitude
  • Artificial Satellites
  • Computers
  • Cycles
  • Elevation
  • Ephemerides
  • Latitude
  • Low Altitude
  • Regression Analysis
  • Solar Cycle

Readers

  • Computational Modeling and Simulation
  • Space Exploration and Orbital Mechanics.

Technology Areas

  • Space
  • Space - Orbital Debris