Fast error analysis of continuous GNSS observations with missing data

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Bos, MS (Autor) Outra; Fernandes, RMS (Autor) Outra; Williams, SDP (Autor) Outra; Bastos, L (Autor) FCUP

Revista

Título: Journal of Geodesy

Vol. 87

Páginas: 351-360

ISSN: 0949-7714

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 5 Citações

Outras Informações

ID Authenticus: P-005-2CX

DOI: 10.1007/s00190-012-0605-0

Abstract (EN): One of the most widely used method for the time-series analysis of continuous Global Navigation Satellite System (GNSS) observations is Maximum Likelihood Estimation (MLE) which in most implementations requires operations for observations. Previous research by the authors has shown that this amount of operations can be reduced to for observations without missing data. In the current research we present a reformulation of the equations that preserves this low amount of operations, even in the common situation of having some missing data.Our reformulation assumes that the noise is stationary to ensure a Toeplitz covariance matrix. However, most GNSS time-series exhibit power-law noise which is weakly non-stationary. To overcome this problem, we present a Toeplitz covariance matrix that provides an approximation for power-law noise that is accurate for most GNSS time-series.Numerical results are given for a set of synthetic data and a set of International GNSS Service (IGS) stations, demonstrating a reduction in computation time of a factor of 10-100 compared to the standard MLE method, depending on the length of the time-series and the amount of missing data.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10