The signals from Global Navigation Satellite Systems (GNSS) such as GPS and Galileo as well as Satellite Based Augmentation Systems (SBAS) are particularly vulnerable to disturbances caused by jammers or spoofers.
In aviation, where safety is a crucial aspect, the importance of GNSS based applications has been tremendously increasing within the last years. By using GNSS in combination with additional augmentation systems (SBAS and GBAS), the obtained position accuracy allows for an approach using only these systems.
At the moment, the number of reports about disturbances affecting SBAS/SMGCS (SMGCS - Surface Movement Guidance and Control System) are increasing. As an example, the airport of Newark faces signal interferences caused by jammers in cars and trucks passing by on highways near the airport. Although the use of jammers and spoofers is illegal, a significant number of drivers use such instruments to discard build-in GNSS tracking systems. Certainly, most of them are not aware of the dangerous consequences for aviation and human life caused by the use of jammers.
Consequently, there is the need to monitor the related radio-frequency spectrum to detect interferers and therefore increase the reliability and availability of GNSS and SBAS/SMGCS in airport surroundings.
The aim of GAIMS is to develop a demonstrator to reliable detect and classify interferences caused either by a jammer or a spoofer. In order to reach this goal, state of the art algorithms for interference detection are implemented, analysed and improved if necessary. In addition, also signal parameters such as signal power, bandwidth and frequency are estimated. The algorithms are implemented in a software based framework, leading to a high flexibility and adaptability with minimal hardware costs.
Apart from technological development, also a market and business analysis is carried out to investigate the economic benefits of the proposed interference monitoring system.
This project was funded by the Austrian Promotion Agency (FFG) within the Austrian Space Applications Programme (ASAP).