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MANUAL P/N 900000108 REV D
29
5.1.4.2.2.1
Settings
The Settings consist of three fields, the Position Mode, Position, and Cold Start. A Set Position link is
available for the Position setting. A Cold Start link is available for the Cold Start setting. The following
two sections describe the two links.
5.1.4.2.2.1.1
Position Mode
The GPS receiver operates in one of three position modes.
Table 5
describes the three position modes
supported by the system.
POSITION
DESCRIPTION
Position Fix
The GPS receiver navigates and continues to calculate new positions from a
minimum of 4 satellites.
Position Hold
The GPS receiver does not navigate and is programmed to a known position
therefore the receiver stops calculating new positions. Instead, the receiver will
only derive time. Also only 1 satellite needs to be in view.
Site Survey
The GPS receiver navigates while it averages a specified number of sample
positions. A minimum number of 4 satellites must be tracked during this time.
Once the averaged value is determined, the receiver is set to the averaged value
and enters position hold mode. Only 1 satellite must be tracked during this time.
Table 5 GPS Position Modes
Upon power up, the system checks whether the GPS receiver is in position hold mode or position fix
mode,
If in position hold mode, the GPS receiver will be placed in navigation mode and a short position
average is performed. If the averaged value is within the threshold (100 meters), the GPS receiver is
placed in the original hold position. Otherwise, the GPS receiver will be placed in site survey mode.
If in position fix mode, the GPS receiver will be placed in site survey mode.
5.1.4.2.2.1.2
Position
Figure 10
is displayed when the user clicks on the Position link. The Position consists of seven fields,
the Latitude, North, South, Longitude, West, East, and Altitude. This link allows the user to set the
position of the GPS receiver. Please note that the input format is DD.DDDDDD. The latitude and
longitude are in decimal degrees with decimal fractions (not minutes and seconds of arc). The North/
South radio button indicates whether the Latitude is North or South of the equator. The West/ East
radio button indicates whether the Longitude is East or West of the Prime Meridian. The altitude is
expressed as decimal meters with a decimal fraction.