Interference Modelling for GNSS Applications in Rail Environment

Abstract

Positioning and timing services provided by a Global Navigation Satellite System (GNSS), for example by the U.S. Global Positioning System (GPS), have already given rise to various applications in almost all fields of our everyday lives. Furthermore, significant performance improvements which are planned to be achieved by coming European GNSS Galileo and the future modernized GPS open room for so called safety-of-life GNSS applications with extremely high requirements to accuracy and reliability. One of the GNSS safety-of-life applications is the rail environment or specifically train location and collision avoidance. In order to fulfill the high requirements new navigation receiver algorithms have to be assessed and simulated in an environment which is as close as possible to the real world including man made unintentional interference. In order to provide a simulation environment for navigation in rail application a measurement campaign was conducted in May 2006 where interference in the navigation frequency bands was measured. It is believed that this data will serve as a suitable starting point to develop realistic descriptive models of interference in such environments. Aim of the thesis is to develop essential parts of an interference model that can be used in further GNSS interference simulations. Several measurements shall be analyzed to provide further knowledge about structure of interferer in time as well as frequency domain.