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Old 02-07-2020, 18:13   #16
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Re: Suddenly Strong, Many GPS Signals

"I really can't see how the USB port can have an effect."

The effect is likely from the power supplied by the port. If it's low or noisy I guess it could have an effect. Don't know much about USB ports or the internals of the GPS receivers. Just a guess on my part.

John
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Old 02-07-2020, 18:53   #17
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Re: Suddenly Strong, Many GPS Signals

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For some reason my little puck GPS receiver is reporting 15-18 satellites in use for a fix with SNR values above 40db. This from the GSV and GSA sentences received from the receiver. i noticed this a few days ago. Previously I was lucky to have 5 satellites in use for the fix with SNR values around 15DB. Nothing, I am aware of, has changed in the interim.

Here is a screen capture of software I wrote which displays the satellites. 10 GPS satellites and 8 Glonass satellites. Never saw this in the past. Anyone else having the same experience or have an explanation.

https://www.screencast.com/t/jZAmR2E8riy


Elon Musk and Space X is launching new communication satellites by the hundreds. Signals are reported to be eight times stronger.
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Old 02-07-2020, 21:00   #18
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Re: Suddenly Strong, Many GPS Signals

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Originally Posted by KS_Sailor View Post
Elon Musk and Space X is launching new communication satellites by the hundreds. Signals are reported to be eight times stronger.

But not GPS satellites.


He is launching Starlink Low Earth Orbit broadband communication satellites. Similar in concept to the existing 03B but much closer to the earth so even less latency compared to traditional telecommunications satellites, but requiring many more satellites(thousands rather than hundreds)
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Old 03-07-2020, 00:12   #19
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Re: Suddenly Strong, Many GPS Signals

You know they're gonna have to kill us if you guys figure out what-all's going on up there....
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Old 03-07-2020, 01:56   #20
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Re: Suddenly Strong, Many GPS Signals

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Originally Posted by Chuck Hawley View Post
Interesting comment. I am not sure how the Russians would keep their satellites in the northern latitudes. Are the orbits of the Russian satellites inclined like the GPS orbits are? Are the orbits and placement of the satellites in the orbits such that they only have enough satellites available at certain times of the day?

Just asking.

Chuck

Some future GLONASS satellites will be put into "tundra orbit" -- extremely cool:


Click image for larger version

Name:	Animation_of_Tundra_orbit.jpg
Views:	17
Size:	38.2 KB
ID:	218648


https://en.wikipedia.org/wiki/Tundra_orbit


Wonder who dreamed that up. This is like something out of Tsiolkovsky.
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Old 03-07-2020, 04:40   #21
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Re: Suddenly Strong, Many GPS Signals

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Some future GLONASS satellites will be put into "tundra orbit" -- extremely cool:


Attachment 218648


https://en.wikipedia.org/wiki/Tundra_orbit


Wonder who dreamed that up. This is like something out of Tsiolkovsky.

Japanese QZSS SBAS satellites uses the same type of orbit. They even show it in their logo:


https://en.wikipedia.org/wiki/Quasi-...tellite_System


QZSS uses one geostationary satellite and three satellites in Tundra-type highly inclined, slightly elliptical, geosynchronous orbits. Each orbit is 120° apart from the other two. Because of this inclination, they are not geostationary; they do not remain in the same place in the sky. Instead, their ground traces are asymmetrical figure-8 patterns (analemmas), designed to ensure that one is almost directly overhead (elevation 60° or more) over Japan at all times.
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