Analysis on Signals for LEO-PNT Beyond GNSS

The utilization of Low Earth Orbit (LEO) platforms for Positioning, Navigation, and Timing (PNT) applications represents an innovative field of research. The increasing interest in this domain is further propelled by the emergence of LEO mega-constellations, signifying a paradigm shift in satellite-based communication and navigation systems. The primary objective of this research is to establish an end-to-end testbed capable of systematically examining diverse signal types in the LEO-PNT context. In doing so, we concentrate on Global Navigation Satellite System (GNSS)-like signals as a benchmark for comparison and explore the pioneering application of Chirp Spread Spectrum (CSS) signals to evaluate their potential for enhancing PNT capabilities. The paper describes the simulation framework and provides the initial results obtained under a case example using the orbital parameters of the Globalstar system.