Synchronizace casu

[Lubor Otta]

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Od:	Zdenek Dvorak
Odesl=E1no: 	17. prosince 2000 0:56
Komu:	Multiple recipients of list
P=F8edm=ECt: 	RE: Synchronizace casu

ten signal leze z kazde GPSky nebo je treba nejaka specialni? Jak je to
spolehlive? Mam podobny problem a potreboval bych to resit co =
nejlevneji. S
DCF jsem tezce pohorel.

chaos
Z oem gpsek, tedy tistak, napajeni 5 (nebo i 3) to leze skoro z kazede, =
treba Trimble SK8-II
Astech G8

Turisticke Gpsky, tedy kompaktni pristroj s displejem, na baterie =
sekundovy vystup vetsinou nemaji.
Lubor
> O GPS neco vim, sekundove impulsy ktere vychazeji z prijimace
> mohou mit dnes, tedy pri vypnutem SA dluhodobou stabilitu lepsi
> nez 1mikrosekunda, mozna (100ns) proti mezinarodnimu atomovemu
> casu. Je to dobre, ale na sychrinizaci PCM telefonich linek to nestaci =
:-(
> Problemem GPS jsou rychle flutuace pri vychazeni a zapadani
> druzic, zmeny v ionosfere.
> Pokud synchronizujete pocitace prez soft NTP bude to ovsem asi o
> 4 rady horsi.
> Lubor
>
> Chtel jsem se zeptat, zda zde nektery z ucastniku se nepohybuje v =
oblasti
> synchronizace casu, ale upozornuji velice presne, rady desitky =
nanosekund.
> Vim je to sileny, ale potreboval bych to nejak resit. Potrebuji
> sesychronizovat vzdalene stanice.  Cena reseni prakticky nehraje roli,
> dulezita je presnost. Nevite nahodou jak presnou synchronizaci muzu =
ziskat
> pres GPS?
>
> Diky,
> David Hrbac
>
>
>



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