Accession Number:

ADA093024

Title:

DSCS II Satellite 9444 Telemetry Transmitter Anomaly Report

Descriptive Note:

Final rept.

Corporate Author:

TRW DEFENSE SYSTEMS GROUP REDONDO BEACHCA

Personal Author(s):

Report Date:

1980-08-01

Pagination or Media Count:

100.0

Abstract:

The satellite was launched November 21, 1979, and was in transit toward 5W longitude East Atlantic Ocean. No unusual telemetry, tracking and command subsystem conditions or other satellite anomalies were noted during the two months of orbital operation. An orbital anomaly investigation team was formed to 1 Determine possible failure causes, 2 Investigate unit and part test histories, 3 Examine telemetry and test correlations which might give clues to the cause of failure, and 4 Compare with similar failures on Flight 4 and the Defense Space Program DSP. After an exhaustive analysis and investigation, no definitive cause of failure could be found. Transmitter ground test history and orbital performance were normal prior to the failure. Possibly a random electronic part failure, such as an open or short in a diode or transistor, caused the failure however, there is no evidence for suspecting any particular part. Other possibilities include an open circuit in a connector, wiring or printed circuit board trace, but it is unlikely these would have escaped detection during ground testing. No valid reason to suspect any specific failure mode is evident from the information available.

Subject Categories:

  • Unmanned Spacecraft
  • Telemetry
  • Command, Control and Communications Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE