Date of Award
Master of Science in Electrical Engineering
Department of Electrical and Computer Engineering
Sanjeev Gunawardena, PhD
There is a desire for future GPS satellites to be software-defined to enable greater operational flexibility and adapt to a variety of current and future threats. This includes implementing new modulation techniques such as phase optimized constant envelope transmission (POCET) and asymmetric signal authentication methods such as chips message robust authentication (Chimera). Any new GPS signal transmitted must be backwards compatible with the millions of receivers already in use. This thesis shows a variety of tests performed to demonstrate the effects of Chimera and POCET-enabled signals. It is shown through actual radio frequency signal generation, testing the response of current-generation high accuracy commercial off-the-shelf GPS receivers to these signals, that both Chimera and POCET, as implemented in a GPS signal constellation, are backwards compatible.
DTIC Accession Number
Raquet, Nathaniel J., "Analysis of Satellite Timing and Navigation Receiver Pseudorange Biases due to Spreading Code Puncturing and Phase Optimized Constant Envelope Transmission" (2019). Theses and Dissertations. 2279.