Interference Suppression in a GPS Receiver with 4 Element Array Design and Implementation of Beamforming Algorithms

Dabak, Omer Can
Erdem, Fatih
Sonmez, Tolga
Alatan, Lale
Koç, Seyit Sencer
Global Positioning System (GPS) jammers add excessive noise to the received low power GPS signals and have capability to either weaken or completely destroy the positioning performance of GPS receivers for both civilian and military users. Researchers are actively working to develop GPS receiver systems resistant to interference sources. Our aim is to develop a system based on spatial filtering of jamming signals through the use of an active antenna array which is capable to control its radiation pattern by utilizing signal processing techniques. Array radiation pattern is controlled to maximize gain in satellite directions and to create null regions toward jammers. Adaptive beamforming methods provide necessary weighting coefficients to form desired radiation patterns using received data. In this paper, design, production and tests of an active antenna array is presented with implementation of adaptive beamforming algorithms using commercially available development boards.
IEEE/ION Position, Location and Navigation Symposium (PLANS)


Interference Supression in GPS Receivers using Spatial Filtering
Erdem, Fatih; Dabak, Omer Can; Sonmez, Tolga; Alatan, Lale; Koç, Seyit Sencer (2016-05-19)
GPS receiver operation can be interrupted by intentional/unintentional jammers even with low power levels. As the jammers become more abundant, protection of critical systems gains importance. In this work, it is aimed to suppress the GPS L1 band jammers using spatial filtering with antenna arrays. After experimental studies, it is achieved to suppress the jammers and to recover the GPS operation in real environment.
Design of smart antenna array for interference suppression in GPS
Dabak, Ömer Can; Alatan, Lale; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2016)
GPS jammers add excessive noise to received low power GPS signals and have capability to weaken or completely destroy the positioning performance of GPS receivers. The most popular technique to overcome GPS jamming problem is suppression of jammers by using array signal processing techniques. In this thesis, a GPS anti-jamming system is constructed by designing an active antenna array and implementing adaptive beamforming techniques. This thesis mainly include the design of four element active circularly po...
Wireless Displacement Sensing Enabled by Metamaterial Probes for Remote Structural Health Monitoring
Ozbey, Burak; Unal, Emre; Ertugrul, Hatice; Kurç, Özgür; Puttlitz, Christian M.; ERTÜRK, VAKUR BEHÇET; ALTINTAŞ, AYHAN; DEMİR, Hilmi Volkan (2014-01-01)
We propose and demonstrate a wireless, passive, metamaterial-based sensor that allows for remotely monitoring submicron displacements over millimeter ranges. The sensor comprises a probe made of multiple nested split ring resonators (NSRRs) in a double-comb architecture coupled to an external antenna in its near-field. In operation, the sensor detects displacement of a structure onto which the NSRR probe is attached by telemetrically tracking the shift in its local frequency peaks. Owing to the NSRR's near-...
Satellite attitude determination based on GPS carrier phase measurements
Özten, Evrim; Tekinalp, Ozan; Department of Aerospace Engineering (2013)
With the developments in the GPS receiver technology, GPS receivers have been preferable equipments also for the space applications. In the early eighties, they have been used only for position, velocity and time determination. With the further improvements, it has been proven that they can provide not only the positioning information, but also attitude knowledge with the accuracy less than 1 degree. In this thesis, an estimation algorithm is developed in the MATLAB Simulink environment for the attitude det...
Waveguide-based Monopulse Wideband Travelling-Wave Array
GULTEPE, Gokhan; DOGAN, Doganay; Aydın Çivi, Hatice Özlem (2017-07-14)
A novel, travelling-wave, waveguide antenna structure with monopulse capability in the two principal planes is proposed with increased frequency bandwidth. The array consists of two interleaved waveguide arrays which provide appropriate excitations to the antenna elements above the waveguide to generate proper sum and difference patterns. With the use of printed antennas and the elimination of the narrow frequency characteristics of the slots on the waveguides, the bandwidth of the array is greatly improved.
Citation Formats
O. C. Dabak, F. Erdem, T. Sonmez, L. Alatan, and S. S. Koç, “Interference Suppression in a GPS Receiver with 4 Element Array Design and Implementation of Beamforming Algorithms,” presented at the IEEE/ION Position, Location and Navigation Symposium (PLANS), Savannah, GA, 2016, Accessed: 00, 2020. [Online]. Available: