Hi has anybody been able to test Iridium’s STL signal for PNT? There is a nice evaluation done by NIST here (https://www.nist.gov/publications/measuring-timing-accuracy-satellite-time-and-location-stl-receivers), from what I can tell from the graphs in the document the peak-to-peak variation is about 320ns with OCXO, and around 80ns with Rb oscillator. It also seems that the STL’s time scale can drift from UTC(NIST) over time: adding some 50 ns in 100 days before being steered back. There are apparently only two companies making modules now: Viavi’s STL-2600 (from Jackson Labs), or Oscilloquartz/Adtran’s OSA 5400 STL. I am trying to get one of those STL receivers, but it seems to be near impossible. Is there someone, who knows someone who knows you-know-who who knows where to get any STL receiver? Appreciate any pointers! Best regards Zdenek

Interesting question. The company is Satelles and they claim to have 40 patents (although under that name they are all applied for and not granted). This URL is a sales talk promoting the product: https://www.unoosa.org/documents/pdf/icg/2023/ICG_WG-S_LEO-PNT_Workshop_June_2023/ICG_LEO-PNT_Workshop_2023_05.pdf And these URLs may be of use: https://pure.coventry.ac.uk/ws/portalfiles/portal/53307908/Zidan_et_al_GNSS_Vulnerabilities_Existing_Solutions_A4.pdf https://www.sciencedirect.com/science/article/pii/S2352340923000239 https://asp-eurasipjournals.springeropen.com/articles/10.1186/s13634-023-01022-1 On Thu, Jun 6, 2024 at 6:06 PM Zdenek Chaloupka via time-nuts < time-nuts@lists.febo.com> wrote: > Hi > > has anybody been able to test Iridium’s STL signal for PNT? There is a > nice evaluation done by NIST here ( > https://www.nist.gov/publications/measuring-timing-accuracy-satellite-time-and-location-stl-receivers), > from what I can tell from the graphs in the document the peak-to-peak > variation is about 320ns with OCXO, and around 80ns with Rb oscillator. > > It also seems that the STL’s time scale can drift from UTC(NIST) over > time: adding some 50 ns in 100 days before being steered back. > > There are apparently only two companies making modules now: Viavi’s > STL-2600 (from Jackson Labs), or Oscilloquartz/Adtran’s OSA 5400 STL. > > I am trying to get one of those STL receivers, but it seems to be near > impossible. Is there someone, who knows someone who knows you-know-who who > knows where to get any STL receiver? > > Appreciate any pointers! > > Best regards > Zdenek > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com