Accession Number : AD0697903

Title :   COMPARISON OF THEORETICAL AND EXPERIMENTAL ATTITUDE DATA FOR THE DODGE SPACECRAFT.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Whisnant,J. Miller ; Pisacane,Vincent L.

Report Date : AUG 1969

Pagination or Media Count : 79

Abstract : The DODGE satellite, launched in July 1967, has successfully achieved gravity-gradient stabilization at near synchronous altitudes. Extendible booms, a constant-speed rotor, and four damping systems provide the opportunity to perform many attitude stabilization experiments. One of the objectives of the DODGE experiment was to determine the adequacy of theoretical analyses by correlation between simulation results and experimental data. This paper presents a comparison between the measured attitude and the results of digital simulation of the equations of attitude motion. Agreement between the two is varied. The digital simulation is also used to investigate possible causes of anomalous attitude behavior. It is shown that boom non-straightness has a significant effect on attitude performance, but that erroneous magnetometer readings of the type that were recorded in orbit do not. (Author)

Descriptors :   (*SATELLITES(ARTIFICIAL), *ATTITUDE CONTROL SYSTEMS), GRAVITY, STABILIZATION SYSTEMS, DAMPING, SIMULATION, EXPERIMENTAL DATA

Subject Categories : Astronautics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE