Accession Number:

AD0631802

Title:

A DESCRIPTION OF THE DOPPLER TRACKING SYSTEM TRANET,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1963-05-01

Pagination or Media Count:

45.0

Abstract:

The Doppler tracking system Tranet has the capability of worldwide dissemination of a standard frequency, with proper assistance from a satellite, with an accuracy that exceeds 2 parts in 10 to the 10th power with present equipment. It can also disseminate standard time signals with a resolution of at least 50 micro sec. for a single pass. The system is also capable of measuring the Doppler frequency received from a satellite with an accuracy of 2 parts in 10 to the 10th power. This accuracy allows a resolution in satellite position of 30 meters at the center time of a pass. It is technically feasible to increase the frequency accuracy to a level approaching or exceeding 1 part in 10 to the 11th power, with a corresponding position resolution approaching 1 meter. Dissemination of standard frequency can also be made to approach 1 part in 10 to the 11th power. The accuracy of orbit determination is not currently limited by measurement accuracy, but by the accuracy of gravity and geodesy. At present, the RMS orbital accuracy is estimated at 300 meters world-wide, and 200 meters over North America. Ten satellites looks like a reasonable estimate of the number that can be handled reliably, in full time operations at maximum accuracy. Author

Subject Categories:

  • Direction Finding
  • Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE