Benefits of receiver clock modeling in code-based GNSS navigation

verfasst von
Thomas Krawinkel, Steffen Schön
Abstract

Due to the limited frequency stability and poor accuracy of typical quartz oscillators built-in GNSS receivers, an additional receiver clock error has to be estimated in addition to the coordinates. This leads to several drawbacks especially in kinematic applications: At least four satellites in view are needed for navigation, high correlations between the clock estimates and the up-coordinates. This situation can be improved distinctly when connecting atomic clocks to GNSS receivers and modeling their behavior in a physically meaningful way (receiver clock modeling). Recent developments in miniaturizing atomic clocks result in so-called chip-scale atomic clocks and open up the possibility of using stable atomic clocks in GNSS navigation. We present two different methods of receiver clock modeling, namely in an extended Kalman filter and a sequential least-squares adjustment for code-based GNSS navigation using three different miniaturized atomic clocks. Using the data of several kinematic test drives, the benefits of clock modeling for GPS navigation solutions are assessed: decrease in the noise of the up-coordinates by up to 69 % to 20 cm level, decrease in minimal detectable biases by 16 %, and elimination of spikes and subsequently decrease in large position errors (35 %). Hence, a more robust position is obtained. Additionally, artificial partial satellite outages are generated to demonstrate position solutions with only three satellites in view.

Organisationseinheit(en)
Institut für Erdmessung
Typ
Artikel
Journal
GPS solutions
Band
20
Seiten
687-701
Anzahl der Seiten
15
ISSN
1080-5370
Publikationsdatum
08.08.2015
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Allgemeine Erdkunde und Planetologie
Elektronische Version(en)
https://doi.org/10.1007/s10291-015-0480-2 (Zugang: Geschlossen)
 

Details im Forschungsportal „Research@Leibniz University“