Gps2 - Gps Health (All Models) - Leica MX400 Operating Instructions Manual

Operator's Manual
The graphic on the right hand side of the screen indicates where the
satellites are relative to your present position. The outer ring
represents 0° elevation. The inner ring represents 45° elevation. The
+ sign represents 90° elevation and your present position. Under
normal conditions, the best satellites to track are usually between
15° and 75° in elevation.
The text which is contained in this screen on the six channel
version, is given in GPS2 of the twelve channel version of the
receiver.

GPS2 - GPS Health (All Models)

There are two windows in this display, the top window is a table
indicating which satellites are reported Healthy or Unhealthy by the
satellite almanac. The PRN (PseudoRandom Number) ID table is
divided into columns and rows. The rows represent the 10's digit of
the ID number and the columns represent the 1's digit of the ID
number. The satellite system consists of up to 32 ID numbers. The
ID numbers are called PseudoRandom Numbers because each
satellite must have a unique ID number. Since satellites are ex-
pected to fail at some point in time, and replacement satellites will
be launched, it is conceivable that hundreds of ID numbers may be
needed over the life of the system. However, the ID portion of the
satellite navigation message has a fixed length. So the GPS system
has assigned ID numbers which do not always reflect the Satellite
Vehicle Number (SVN), which is a unique number assigned to each
satellite for performance and maintenance records purposes.
To find a particular satellite ID, for example PRN 24, go down the
left hand column and locate the 10's digit (2- in this case). Then go
across the row until you intersect with the appropriate 1's digit (in
this case 4).
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GPS
Version 3.3