發信人: MDA (Ghost Rider)    看板: Aero
日期: Fri Dec  3 19:57:34 1999
標題: Re: What is  GPS ?

==> Dictionary (飛向天空看夕陽...) 的文章中提到:
>   I read an information regarding "GPS", is there anyone tell me 
>   (1) The full name of GPS ?
>   (2) What kinds of plane or aircraft is using this instruments??

In US, even some airports they have published GPS approach.

each aircraft want to fly GPS approach, must has airwothiness for its

installation.

GPS is a US satellite-based radio navigational, positioning, and time
transfer system operated by the Department of Defense(DoD).

The system provides highly accurate position and velocity information
and precise time on a continous global basis to an unlimited number of 
properly-equipped users.  The system is unaffected by weather and provides
a worldwide common grid reference system based on the earth-fixed coordinate 
system.  For its earth model, GPS uses the World Geodetic System of 
1984(WGS-84) datum.

GPS provides two levels of service: Standard Positioning Service(SPS)
and Precise Positioning Service(PPS).

SPS provides, to all users, horizontal positioning accuracy of 100 meters,
or less, with a probability of 95 % and 300 meters with a probability
of 99.99%.

PPS is more accurate than SPS; however, this is limited to authorized
US and allied military, federal government, and civil users who can
satisfy specific US requirements.

The GPS receiver needs at least for satellites to yeild a 3-dimensional 
position( latitude, longitude, and altitude) and time solution.

The GPS operation must be conducted in accordance with the FAA-approved
aircraft flight manual( AFM) or flight manual supplement.
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* Origin: 中山大學-美麗之島BBS * From: 163.31.39.119 [已通過認證]
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