Accession Number : ADP005710

Title :   The Effects of Electrostatic Discharge Phenomena on Telesat's Domestic Communications Satellites,

Corporate Author : TELESAT CANADA OTTAWA (ONTARIO)

Personal Author(s) : Wadham, P. N.

Report Date : MAY 1987

Pagination or Media Count : 10

Abstract : With the launch of Anik A1 in November, 1972, Telesat Canada became the first owner and operator of a geosynchronous domestic satellite. The company owns a total of nine satellites, of which six are still operational. Also Telesat is unique in that it is the only commercial operator to have operated both spin stabilized and three-axis stabilized satellites. This paper considers a number of observed anomalies believed to have been caused by electrostatic discharges. In particular an unusually severe event is discussed which caused a temporary loss of control and a consequent loss of fuel. Each class of satellite is covered in sequence by launch date. Mention is made of the configuration of the thermal blankets because they are considered to be prime sources of electrostatic discharges. It is not intended to cover detailed design aspects as much of such information is proprietary to the manufactures. This paper is a narration of the practical experiences of a typical commercial operator.

Descriptors :   *ELECTROSTATIC CHARGE, *ELECTRIC DISCHARGES, *COMMUNICATION SATELLITES, SYNCHRONOUS SATELLITES, COMMERCIAL EQUIPMENT, ANOMALIES, THERMAL INSULATION, LAYERS, CANADA.

Subject Categories : Electricity and Magnetism
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE