Accession Number : ADA019156

Title :   NTS-1 (TIMATION III) Quartz- and Rubidium-Oscillator Frequency-Stability Results,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : McCaskill, Thomas B. ; Buisson, James A.

Report Date : 12 DEC 1975

Pagination or Media Count : 24

Abstract : The report describes frequency stability results obtained from the NTS-1 satellite. NTS-1 has three on-board frequency sources: one quartz oscillator and two rubidium resonators. These are used to derive the precise time and frequency signals radiated by the spacecraft. The data taken from each of three 2.5-hr daily passes are time difference (range) or frequency difference (doppler). These data are incorporated into a single value for each pass which is subsequently used in computing long-time Allan-variance results. The results presented here employ single-frequency measurements at 335 MHz. Analysis of these results indicate an effect on measured frequency stability that correlates with a resonant term in the orbit. The results further indicate the rubidium frequency depends on the spacecraft temperature, which confirms previous NRL preflight analysis.

Descriptors :   *FREQUENCY STANDARDS, *NAVIGATION SATELLITES, QUARTZ RESONATORS, CRYSTAL OSCILLATORS, RESONATORS, RUBIDIUM, TIME STANDARDS, STABILITY.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE