An article on HAS/PPP service comparison

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https://insidegnss.com/galileo-has-a-performance-assessment-in-urban-driving-environments/

This is quite informative. The author tested HAS service in real world and demonstrated the key specification for accuracy.

And it deed compares QZSS CLAS/MADOCA and BDS PPP, which is interesting. 

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I wonder how difference PPP augmentation source would interact with each other. If multiple correction information could be used for one satellite, how will receiver to pick the appropriate one ? 

[Jim bell]

I continue to wonder if there is actually some ability to incorporate IDD (Internet Data Distribution) corrections into Galileo  readings, given the absence of E6 satellite signal reception ability.

Further, I wonder when the first smartphones with E6 satellite reception ability will become available.  Looking through the table of smartphone capabilities, I notice that (with one exception, so far, I've found...) the most recent date of the GPS chip is "2020".  This, sadly, may explain why Galileo E6 satellite-reception capability is not yet available on any smartphone.  If the designers of the Galileo HAS service had delivered their anticipated design to these manufacturers a year or two earlier, perhaps we would have seen this ability appear shortly after 2020.  Absent that, I wonder why the designers of the Android OS couldn't have included the IDD corrections into the mix.  

This material has been archived on Reddit, but it raises questions about which smartphones are ACTUALLY available to employ HAS corrections, whether IDD or SDD.

https://www.reddit.com/r/space/comments/10k6tde/galileo_high_accuracy_service_has_is_now/

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IDD is more promising. Consider add dedicated E6 antenna will be costly in smartphone. 

Jim bell <jimd...@gmail.com> 于2023年12月19日周二 08:30写道：

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[Tony Tschanz]

Some update on HAS:

https://eos-gnss.com/knowledge-base/galileo-high-accuracy-service-early-observations

[Jim bell]

Very, very interesting. 

 One thing I don't understand is:  Why didn't they (or DID they?..) deliver the facts, the definitions, the PLAN for all this to the GNSS chip designers/manufacturers back in, say, 2018?   Shouldn't such designers should have been able to design in this HAS and PPP feature then, or at least long prior to 2024?

And I don't understand "convergence".  It sounds like they are saying you have to wait an hour to get an accurate reading?  Is that from a 'cold start'?  Or from a 'warm start'?

From that document:

"Currently, Phase 1 initial service has a reduction in performance targets and is operating in SL1 across the globe. SL1 provides corrections for satellite orbits/clocks and not yet for code/phase biases. Because of this, current convergence times for SL1 are around 25 to 60 minutes worldwide."

"Next year during Phase 2, or “full service,” SL1 will offer a worldwide improved convergence times of <300 seconds (under five minutes). At the same time, SL2 will be available in Europe to still deliver <20 cm accuracy but with improved convergence times of <100 seconds (under two minutes). This will be achieved by incorporating better corrections using atmospheric correction models."

(End of quotation).

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[Louis Philippe]

Indeed……very very interesting…...

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