Accession Number:

ADA509551

Title:

C-And Ku-Band Two-Way Satellite Time Transfer Comparison Experiment

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1997-12-01

Pagination or Media Count:

12.0

Abstract:

In the development of a new time dissemination capability for the U.S. Air Force Eastern Missile Test Range, the satcom channels to be used became an issue in terms of performance over different links and available coverage. A primary advantage of C band is that satellite coverage is more widely available in remote areas where Ku coverage is limited or not available at all. To investigate the performance issue, a Two-Way Satellite Time Transfer TWSTT experiment was performed to obtain comparative data over both C and Ku band. Time transfers between two sites using atomic frequency standard clocks were performed over both links to compare results in a controlled experiment. The objective of the experiment was to determine the relative precision of TWSTT over the frequency bands. Time transfers were performed between a station located at Rockledge, Florida and the NIST facility at Ft. Collins, Colorado for a period of approximately ten days. GPS receivers were used in common-view mode referenced to the same clocks as an independent comparative measure. Tests were conducted over a wide range of temperature variations and weather conditions. Observations were obtained during snow, heavy rain and sun with temperatures from 8 to 90 degrees Fahrenheit at the two stations. Analysis of the resultant data shows that time transfer over the two links performed equallywith residual RMS results of approximately 5 nanoseconds.

Subject Categories:

  • Navigation and Guidance
  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE