arXiv:2611.13655v1 Announce Type: cross Abstract: We present experimental results from Starlink for pseudorange-based positioning, navigation, and timing (PNT), emulating a system that fuses a primary communications mission with a secondary low-Earth orbit (LEO) PNT mission. Legacy global navigation satellite system (GNSS) constellations faceinherent vulnerabilities and signal limitations, prompting growing interest in broadband LEO constellations---such as SpaceX's Starlink---for resilient PNT. However, opportunistic use of stand-alone Starlink signals fails to achieve GNSS-competitive accuracy due to frame timing irregularities and reliance on uncorrected poor-quality publicly available ephemeris data. To overcome these limitations, we present a mock implementation of a fused LEO GNSS architecture. Our method extracts time-of-arrival observables from live Starlink Ku-band downlinks and pairs them with high-fidelity, beam-specific orbit and clock models distributed as if provided natively by the constellation operator. In a field campaign, and despite constraints imposed by consumer-grade receiver hardware, the method yields 95% error bounds of 2.33 m horizontally (semi-major axis), 3.37 m vertically, and 11.19 ns in timing, with the actual solution errors falling well within these bounds.