Accession Number:

ADA003752

Title:

Shaded Sun Sensor Modeling for Spacecraft Acquisition Performance Analysis,

Descriptive Note:

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF ENGINEERING SCIENCE OPERATIONS

Personal Author(s):

Report Date:

1974-11-01

Pagination or Media Count:

25.0

Abstract:

The sun sensor used in the 3-axis control of a spacecraft is modeled, and its effects on sun acquisition performance are demonstrated. The sensor is made up of the combined outputs of four discrete solar cells electrically connected in a manner to achieve the control error signals. To protect these cells from interfering reflections from the spacecraft body, a shade surrounding each cell is added. The shades produce significant variations in sensor outputs from the unshaded outputs. Acquisition control stability is influenced by the introduction of the shade. A set theoretic approach is used to obtain a model of the shaded sensor output. This model is incorporated in a rigid body spacecraft simulation, and sun acquisition performance is presented.

Subject Categories:

  • Electric Power Production and Distribution
  • Astronautics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE