High Rate Performance Assessment of GNSS Raw Data Based on the DLR Experimentation and Verification Network

Thoralf Noack, Evelin Engler and Dietmar Klähn

Abstract:	In co-operation between DLR IKN and the German aerospace company Jena-Optronik GmbH, the ‘Experimentation and Verification Network’ (EVNet) was developed over the past years. The EVNet was designed to provide a basic infrastructure realizing the networked reception, transmission, archiving, and distribution of any kind of GNSS data as well as derived products via Internet in nearly real time. For this purpose a set of sensor stations - each equipped with GNSS-receivers and optional meteorological sensors, a processing host, and additional components to fulfill the requirements of a complete remote control system - are currently installed on selected world wide locations to support the research and development activities of the IKN in the field of GNSS/Galileo verification, validation, and application. The added value of the EVNet is determined by the processing components to implement the GNSS data assessment and the provision of derived data products in the context of the GNSS/Galileo verification, validation of services, and of a Local Element development. A case in point of such processing modules is the high-rate phase processor developed by IKN using the particular feature of the EVNet to operate with 50 Hz GNSS high rate data to full capacity. Its objectives and features cover the self contained detection of cycle slips, the estimation of momentary phase noise, the identification of non-regular phase fluctuations, providing a quantification and validation of the performance of GNSS/Galileo phase measurements in real time. The capabilities of the phase processor have been verified on the basis of data originating from different locations under various propagation conditions. The benefits of the high-rate processing technique will be demonstrated by comparison with conventional 1 Hz results, focusing on the phase behavior during periods of perturbed ionospheric conditions and on the achievable continuity of phase data. Furthermore, by-products of the phase processor like ionospheric propagation errors rates will be analyzed in correspondence with the signal strength behavior provided by an amplitude processor of the EVNet.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	573 - 583
Cite this article:	Noack, Thoralf, Engler, Evelin, Klähn, Dietmar, "High Rate Performance Assessment of GNSS Raw Data Based on the DLR Experimentation and Verification Network," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 573-583.
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