Characterizing the Diurnal Signature in Two Way Satellite Time Transfer (TWSTT) Data with a Kalman Filter

摘要

This purpose of this paper is to call further attention to the technique of using a Kalman filter [1] to estimate the diurnal signature in TWSTT data. Accordingly, we have reduced all publicly available data since 2004 on inter-Europe and Europe-North American baselines [2], for site pairs as well as triplets. Variations in the diurnal amplitude and phase are easily identified, including some that are too weak to be identified by simple inspection. Changes in the variations of the amplitude and phase of the diurnals in the TAI-generating observations are evident when the chip rate and bandwidth were reduced in 2009 (MJD 55042) and the bandwidth was further reduced in 2011 (MJD 55769), as indicated in Table 1. This technique would be a useful tool when used in conjunction with less readily-available information, both meteorological and instrumental.