[time-nuts] Re: Testing Iridium's STL signal

[Mark Kahrs]

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 at 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
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