Abstract:
Global Navigation Satellite System (GNSS) is a navigation system used for geo-spatial
positioning across the globe and encompasses GPS, GLONASS, Galileo, Beidou and other
regional systems. The signals received by GNSS receivers are relatively weak and thus
intentional and unintentional interference or jamming can overwhelm the GNSS reception
which can lead to erroneous or in worst case no navigation at all. This can become a major
issue in case of upcoming autonomous vehicles. Therefore, this thesis focuses on design of
dual-band RF front-end for single antenna based GNSS receivers with the capability of having
frequency agility in order to mitigate jamming and interference in the GNSS bands. Active
smart filtering is used to protect the receiver from interferences and/or to generate appropriate
notifications. Lower and higher bands are separated inside front-end, thus making it ideal for
single antenna-based applications. Front-end is capable of detecting the in-band interference
signals both in GNSS lower and higher bands independently, therefore, only a lower band will
be switched if interference is in lower band, keeping higher band intact and vice-versa. High
rejection is provided by SAW (Surface Acoustic Wave) filters so that only interference signals
are rejected. For the worst-case scenario, when complete GNSS band is jammed, and
interference can’t be mitigated, an appropriate notification indicates that the received signals
are erroneous
