Inverse Problem Research to Improve the Global Positioning System

摘要

This is the Final Report of a three year (plus no-cost extension) research grant to study GPS. Techniques used were developed on earlier AFOSR/NM grants, and include inverse problems, wavelets, information theory, and geodesy. This project developed new signal processing methods, either: (1) to improve the accuracy of the GPS, (2) to generalize GPS to other planets and moons in our solar system or even beyond, or (3) to detect and defeat tampering with the security of the GPS. Jamming, spoofing and unwanted access can come from human sources or atmospheric conditions. The multipath reduction paper discusses topics (1) and (3), while the Feynman functional and geodesy papers discuss all the topics above, (1)-(3). The gravity detection work in progress gives markers to detect tampering with GPS, as well as being very important to fundamental physics and geophysics.