ashtech ZY-12 Information Supplement page 29

Table 3.3. Screen 1- Orbit Parameters (continued)
Parameter
URA Indicates the range accuracy of each satellite. When 0, the accuracy is high;
when over 8, the accuracy is low.
HEL Displays the satellite's health (general condition) in hexadecimal.
AGE Shows how many minutes have passed since lock was lost on the satellite.
For example, when ELV is 35 and AGE is 12, the satellite was at an elevation
of 35° twelve minutes ago when loss of lock occurred. When the satellite is
reacquired, the age resets to 00.
1 The "1" in the lower right corner of the screen indicates the screen number
The receiver needs to know its position to compute elevation and azimuth. Until it
locks on to enough satellites to determine its own position, it can use an estimate
of position; this estimate can be entered on Screen 4, Mode Control.
Screen 1 displays the satellite information for the C/A channel. To see information
on P1 (P-code on L1), press the down arrow; the S/N display is updated for those
parameters and the screen number is displayed as P over 1. Press the down
arrow again to see P2 (P-code on L2); a P displays over the 2 as the screen
number.
Screen Descriptions
Description
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