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GPS Speeds vs Speedo
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[quote][i]Originally posted by Ian[/i] [quote][i]Originally posted by Nath[/i] Top end GPS aquires up to 30 from up to 3 different constellations. More satelites = more accuracy. [/quote]Not really possible as they're not all visible to you at any one time. Even a cheap 12 channel receiver (which most laptop dongle / phone / TomTom are) will pick up all 12 if they're visible. The difference in accuracy is down to its ability to triangulate at the rate at which it updates the data. At 1Hz, you can't be accurate down to much less than a few metres because everything is moving and you physically don't get the data quick enough. The solution is to poll the data more often, with better receivers running at 5 or 10Hz. Problem there is the data bandwidth, hence why you don't see Bluetooth receivers running at those sorts of speeds because you have to tokenise the data or lose some of the sentences. But if you can get the data in, you can increase your positional accuracy. Although speed is a different matter - they are certainly significantly more accurate than a gearbox driven speedo - which is also quite deliberately calibrated to over-read in order that you never accidently speed. And I'm referring there to the ability of the equipment to consistently display accurate readings, not whether the equipment is configured to do so, which is a related but fundementally different question. The gearbox speed is essentially the more accurate apperatus - particularly if you can overlook issues such as tyre flex - as you can't really negotiate the facts. Engine speed x gears x tyre size = road speed. Whereas GPS speed is a calculation based on latent data. Depends what you need really. [/quote]
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