Accession Number : ADA137041

Title :   Further Development of a Computer Algorithm for the Automatic Determination of Space Vehicle Potential in Real Time.

Descriptive Note : Final rept. 1 Aug 82-30 Sep 83,

Corporate Author : LOWELL UNIV RESEARCH FOUNDATION MA

Personal Author(s) : Spiegel,S L

PDF Url : ADA137041

Report Date : Dec 1983

Pagination or Media Count : 33

Abstract : The performance of two related computer algorithms for the purpose of critical potential detection has been analyzed. These algorithms employ positive ion spectra from onboard electrostatic analyzers to determine whether a critical potential has been reached or exceeded. The day to day performances have been examined and individual ion count spectra have been checked in cases of algorithm failure to see what algorithm modifications might lead to improved performance. Additionally, it has been considered whether reliable charge detection could be obtained using a rapid response Electrostatic Analyzer with many fewer energy channels that the 64 channel SC9 experiment of the P78-2 spacecraft. This has led to development of a goodness-of-fit test based on an onboard model of the distribution function profile in the absence of charging. Preliminary tests of this algorithm suggest that it may be useful as a rapid response detection algorithm on its own or as a preliminary test to screen for suspected cases of charging to be further analyzed by one of the other algorithms. (Author)

Descriptors :   *Algorithms, Spacecraft components, Ionization potentials, Determination, Electric charge, Space charge, Charged particles, Real time, Data bases, Computer applications

Subject Categories : Theoretical Mathematics
      Electricity and Magnetism
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE