Reply to post: Re: EU friends apparantly @ ArrZarr

Blighty stuffs itself in Galileo airlock and dares Europe to pull the lever

JassMan Silver badge

Re: EU friends apparantly @ ArrZarr

I don't believe 10 is enough. Galileo wouldn't be using 24 with a further 6 spares if they didn't need need them. The problem is that you can't use geostationary 'cos they are all in the same plane which is no good for accuracy. Not to mention the fact that in the north of Scotland most of your satellites will be so low on the horizon that every medium sized bush will blank your signal. Even if you could find a set of polar orbits which gave good trilateration over UK you would still need a minimum of 3 on each orbit which makes 12 the least you can use. (Trilateration requires that 4 satellites are visible at the same time, 3 for position + 1 for altitude)

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