Memorex RX 1 Smart Installationshandbuch PDF herunterladen (Seite 105)

104 | Simrad MX500

GPS2 - GPS Health Screen

There are two windows in this display, the top win-

dow is a table indicating which satellites are reported

Healthy or Unhealthy by the satellite almanac. The PRN

(PseudoRandom Number) ID table is divided into col-

umns 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.

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).

The bottom window provides some basic satellite track-

ing performance information. The HDOP and VDOP values

indicate the current Horizontal or Vertical Dilution Of

Precision.

The Used Sats value indicates the number of satellites

used in the navigation filter to calculate your position

The Elevation Mask sets the lowest elevation at which a

satellite will be tracked. Satellites with an elevation below

this number will not be tracked, even if they are other-

wise available to track.

Unhealthy Satellites

Satellites are expected to fail at some point in time and

they may cause the position calculation to become er-

roneous. With RAIM enabled units, you will be able to

determine which satellite PRN number is causing the

position error. The operator can then decide to manually

force the offending satellite to “unhealthy”. A satellite

that is marked as unhealthy will not be used for position

calculation.

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Memorex RX 1 Smart Installationshandbuch Seite 105