Time-nuts have occasionally asked me for data on the performance of the Satelles STL system, which uses signals from Iridium satellites rather than GNSS satellites to provide a worldwide source of precision timing. The following paper from PTTI 2023 presents results from a multi-year evaluation of STL timing performance by the NIST timing lab in Boulder, Colorado. We plan to present a follow-on paper at PTTI 2024. https://www.nist.gov/publications/measuring-timing-accuracy-satellite-time-and-location-stl-receivers Additional information is available on the NIST page on our website https://satelles.com/nist including pointers to NIST technical notes 2187 and 2189 which also evaluated STL. Cheers! --Stu

On 07/10/2023 00:25, Stewart Cobb via time-nuts wrote: > Time-nuts have occasionally asked me for data on the performance of the > Satelles STL system, which uses signals from Iridium satellites rather than > GNSS satellites to provide a worldwide source of precision timing. Most interesting, Stu, thanks. Do you have a guide as to the accuracy of location, rather than timing, even as a rough guide compared to single frequency GPS? Thanks, David -- SatSignal Software - Quality software for you Web: https://www.satsignal.eu Email: davidtaylor@writeme.com Twitter: @gm8arv