Electrical and Computer Engineering ETDs

Publication Date

Summer 7-25-2023


Global Positioning System (GPS) is an essential part of modern life but is susceptible to same frequency jamming. GPS jamming can add excessive noise to a received low power signal and have the capability to change or completely distort information being sent through the GPS signal. Adaptive antenna arrays have long since been a solution to mitigating GPS jamming via beamnulling algorithms. However, there is little research on the effectiveness of these beamnulling algorithms under varying element positioning. In this work, an adaptive antenna array, consisting of Right-Hand Circularly Polarized (RHCP) nearly square GPS antenna elements, was constructed and tested for beamnulling applications. Two beamnulling algorithms (LCMV and MVDR) and two orientations (Orientation 1, an optimal 2x2 λ/2 spacing orientation, and Orientation 2, a less common “+” shaped array with 0.55λ spacing) are simulated, tested, and compared with each other.


Electromagnetics, Antennas, Adaptive Antenna Arrays, Beamforming, Beamnulling, GPS, Anti-Jam

Document Type




Degree Name

Electrical Engineering

Level of Degree


Department Name

Electrical and Computer Engineering

First Committee Member (Chair)

Christos Christodoulou

Second Committee Member

Mark Gilmore

Third Committee Member

Jeff Williams