The main objective of this project is to design, develop, and validate a prototype ultra-large synthetic aperture array (ULSA) GNSS receiver for automotive applications, both hardware and software, based on a moving array antenna. While there is a lot of prior art on GNSS antenna array techniques, and some on extending a single GNSS antenna into a synthetic array, there are no documented real-life experiments to extend an array of more than two elements into a synthetic array. Using multi-frequency, dual-polarized antenna elements will enable precise 3D AoA estimation of direct and reflected satellite signals, improving interference detection and mitigation. The system will also localize sources of jamming or spoofing and dynamically control the array reception pattern to suppress them.