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Hi und Servus da draußen.
Mich würde mal interessieren, was das Programm QuickGPS eigentlich genau macht.
Klar ist ja, dass es Satelliten-Daten aktualisiert um danach schneller den Standort bestimmen zu können aber was genau sind das für Daten die sich QuickGPS da läd?
Weiß das wer?
Greez & THX
Kobold
Hab ich eben in nem anderen Forum so gefunden:
Also er läd sich nur die aktuellen Orbitalpositionen der Sateliten runter um sie schneller zu finden, so in der Art ;-)Zitat:
Some other posts on the Wiki reference Quick GPS, but seem to mistake what it does, so I thought I'd clear it up, being a professional in the space.
Quick GPS does not "triangulate" using cellular networks, not even close. Let me start by telling you how a GPS gets a fix on its location, and then explain how Quick GPS offers a shortcut.
The GPS chip receives a synchronized timed signal from the satellites (birds) the US DoD launched into orbit. Each bird uses a different channel. With a good signal from three or more birds, GPS starts to get a fix. It does this by calculating the time difference between the reception of the different signals, then calculating the relative distances to each of the birds, then figuring out where it sits in the middle of the birds.
The GPS calculates four spheres, and its located somewhere on the surface of each of these spheres. There is only one point where these four spheres intersect. That's you.
If you're good at geometry, you might think that it needs 4 birds to get a fix, but in fact, if the GPS assumes that you are on earth, that provides another sphere, so it only requires 3 birds to get a decent fix. More adds altitude and accuracy.
But the GPS needs to know where each of the birds is before it can decide where IT is. That information is not calculated, but is available in a detailed download of orbital data provided by the DoD called ephemeris data. It is transmitted...from the bird to your GPS. For a cold start, your GPS needs to download the entire file, without interruptions in the signal - BEFORE it can even start getting a fix. In fact, the GPS may not even know which channels to tune into, since it doesn't yet know which birds are currently overhead. This causes a slow first fix.
Quick GPS, is simple. Ephemeris data is passed thru WiFi or cellular data connection ahead of time, and you never have to wait for it to download over the satellite. Awesome.
Kann ich nur teilweise indirekt proportional zustimmen.
Die Kathete liegt immer auf einer Eben mit der Dekade!
Kurzsprechweise: 2=2-1²*4 (23)³
Zitat:
Zitat von Unregistriert
:confused::confused::confused:
Ihr mit Euren ganzen Fremdwörtern könnt mir gar nicht impregnieren.Zitat:
Zitat von Unregistriert
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