Beidou to integrate 80-168 low orbit sats into the constellation by 2035

[Invalid Data]

It's official. The next generation BDS have 4 types of orbit (meo, geo, igso, leo) , and aiming global high accuracy (sub 0.5m). Initial satellite group launch before 2027.

http://ch.whu.edu.cn/article/doi/10.13203/j.whugis20210567

There's some papers about LEO PNTs, emulation shows 168 LEO provide good user integrity, low convergence time, high SNR up to 60dB. 

Also by design, LEO satellites act as a telemetry matrix for GPS BDS Galileo Glonass. So the orbit error is measured within 5cm accuracy! Because LEO satellites move really fast they can access more sufficient data.

Clock error isn't more accurate tho, the availability is improved to 100% however, compare to station only telemetry.

User RMS error is improved 30-40%, not really groundbreaking cause the original accuracy is sub 0.5m too. The real change is convergence time is 60-70% shorter. Which means BDS broadcast PPP signal to everywhere just like Galileo HAS by 2035.

[Jim bell]

This is wonderful news. I wish it was said that it was going to be done much more quickly than to be  completed by 2035.  And I also wonder if this will be handled by today's Beidou phones, or whether they need to be replaced by new hardware. Maybe that doesn't matter much.

--
You received this message because you are subscribed to the Google Groups "GPSTest" group.
To unsubscribe from this group and stop receiving emails from it, send an email to gpstest_andro...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/gpstest_android/c164922a-c077-4e34-b2b1-33aa82e25495n%40googlegroups.com.

[Jim bell]

Since the subject is Beidou, I wanted to raise an issue. I have been seeking my "great white whale", a phone that does gps, glonass, galileo, and Beidou signals.  Problem is, the last three phones I bought looked like they were going to receive Beidou, but they did not. 

They were listed on the dual frequency database as being Beidou capable, but I think they were geofenced to have the Beidou turned off while in America. 

My vague impression is that some sort of American government regulations prohibited the operation of Beidou receivers. 

The three kinds of phones that I have purchased that appear in the database to receive Beidou yet don't are: 

LG V60

Asus Zenphone 8 Flip

Motorola Edge 50

Oddly, the only Beidou-capable smartphone I have is a OnePlus Nord2 5G phone, which of course is Chinese.  Maybe they simply do not follow the regulations that other phones do. 

I want to know about any way to fix those other types of phones. Possibly some sort of developer mode? 

I also want to know if Beidou capable phones will employ these new types of satellite orbits that are described above, or will new phones have to be purchased? 

[Invalid Data]

For United States, I would have choose phones with Qualcomm chip. Phone with mediatek almost are exclusive to China and south east Asia. Much like Google Pixel is exclusive to America. 

Then Beidou PPP service is not available in US, so it's not a reason to choose mediatek. Now there are two grounds.

OnePlus might be the direct answer, if they appear to have Beidou as you described. In OnePlus 13, Beidou was software filtered like the post here. But a user provide a hack solution for it.

https://xdaforums.com/t/solved-oneplus-13-us-version-only-has-gps-and-galileo-software-or-hardware-limitation.4713739/

Or you can take the risk to purchase parallel import phones like Xiaomi and vivo.

The downside is you don't get to hands on it in retail stores and therefore don't know the build quality and operation system is good enough. And no warranty.

You should consider what phone you want for daily use first ,then combine with PNT accuracy.

To unsubscribe from this group and stop receiving emails from it, send an email to gpstest_android+unsubscribe@googlegroups.com.

[Invalid Data]

And then there's another interesting topic. Whether existing phone will get to receive newer satellites. The answer depends on how the new satellites join the constellation.

There's a hard coded satellites ID list in Android API. 

If the new satellite is within the list and send the known signal type. Phone will receive signal.

For example, Mediatek 9400 phone in 10 years later will receive more L1C than today. Mow there are only a few GPS Block III, but doesn't affect the future.

In the situation where constellation is expanding, like BDS2 to BDS3, and BDS4. Android API limits the amount of satellites. Phone detect the signal then don't recognize it. 

Then API will update ( after the constellation upgrade), following by hardware changes, and phone release. 

So existing phone is unlikely to receive Beidou 4 Gen signal.

Even the signal is backward compatible.

[Sean Barbeau]

One downside of Qualcomm chipset phones is that they typically don't share accumulated delta range (ADR), or Carrier Phase, information via the Android API. The only exception I know of being the Pixel 4 and 5.

This means you can't do real time kinematics (RTK) with these Qualcomm devices.

Sean

To unsubscribe from this group and stop receiving emails from it, send an email to gpstest_andro...@googlegroups.com.

To view this discussion visit https://groups.google.com/d/msgid/gpstest_android/c164922a-c077-4e34-b2b1-33aa82e25495n%40googlegroups.com.

--

You received this message because you are subscribed to the Google Groups "GPSTest" group.

To unsubscribe from this group and stop receiving emails from it, send an email to gpstest_andro...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/gpstest_android/CAFPPBd-kPSfYL7L52Gn6JSZpjFvsfHYRD-vrkk%3D8Eo2hBNvVFQ%40mail.gmail.com.

[Invalid Data]

By March 2025, delivery first batch satellites was launched. Two more batch planned on the way. 

https://sichuan.scol.com.cn/m/ggxw/202503/82915947.html

Warning this article was written in Chinese.

It did mention some keywords.

There are more than 160 satellite queued. 10 sats per launch and 16 launch in total 

3 launches are planned in 2025. 

Satellites play role as signal relay and space-based monitor station.

Each satellites weights 100kg, no atomic clock aboard. Time is relayed from existing BDS PNT service.

The system is intended to provide PPP high accuracy service. Increase coverage and usability.