Merging Maser and Cesium Clocks in Timescales
Abstract
A variety of ways exist to combine clocks with different characteristics in a timescale. At the US Naval Observatory, for example, a process called dynamic weighting is used, which generates a timescale from a frequency scale that weighs recent maser data relatively higher than older maser data. A Kalman Filter could assign different phase, frequency, and frequency drift process noises to the different clock types. In this paper we use an ensemble of cesium and maser clocks to construct a timescale that is based upon an average of masers that are detrended against a cesium-only frequency scale, and also one which is based upon an average of masers being steered to the cesium timescale. The cesium timescale will be modeled with the BIPM's timescale algos, with a Kalman filter, and with an ARIMA model. The masers will be detrended with a Kalman filter. For comparisons, the three algorithms used for the cesium timescale will be applied to the combined maser plus cesium ensemble with no distinction made between the types of clocks.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2011
- Accession Number
- ADA554685
Entities
People
- Demetrios N. Matsakis
- Gianna Panfilo
Organizations
- United States Naval Observatory