Psion EP10 Manuel d'utilisateur télécharger pdf (Page 159)

Chapter 6: Settings

GPS (Global Positioning System) Settings

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Psion EP10 Hand-Held Computer User Manual

AGPS (Assisted Global Positioning System) Tab

To determine your location, a GPS module receives data from three or more GPS satellites in fixed orbit

around the Earth. The GPS module triangulates your location based on the time it takes for signals to get to

and from the satellites. This works well in fairly clear areas – outdoors, for example. However, if you’re at-

tempting to triangulate your location in city centres where signals bounce off tall concrete buildings or

from within a building, the GPS module will have greater difficulty calculating a fix.

AGPS reduces Time To First Fix (TTFF) and increases the likelihood of finding and keeping a fix in poor cov-

erage areas such as indoor sites. AGPS downloads satellite ephemeris (orbital) data to the EP10 periodically

through WiFi or WWAN. The downloaded data is used by the GPS module to speed the process of getting

afix.

Update

• Click on the Update button to download Extended Ephemeris (EE) files from a secure host on the inter-

net using any interface that has an internet connection (WWAN or WiFi). These files contain several

days worth of ephemeris (orbital) data that can be used if the satellite’s broadcast ephemeris is not

available.

The Status field above the Update button displays the progress of the download, and once successfully

downloaded, the Status field will read Idle.

Settings

• Click on the Settings softkey to define the AGPS server connection settings.

The AGPS server connection settings drop-down menu allows you to choose from two settings: Use default

settings and Use custom settings.

The Use default settings option is generally acceptable for most applications. Note that aside from the

Update field in which you can choose how long the fix is stored in your EP10, the field values cannot be

edited.

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Psion EP10 Manuel d'utilisateur Page 159