BendixKing KLX 135A - Pilots Guide - Manual (Page 87)

initializing itself, collecting information such as the date, time, and last
present position. Next, the receiver collects data from its own
memory to determine which satellites should be visible. After
completing the initialization process the receiver begins the
acquisition process. During this time, the visible satellites are being
acquired and data is obtained from them.
If the KLX 135A is not used for a period of six months or more, the
satellite orbital data stored in the GPS receiver’s memory is too old to
use. When this occurs, the receiver will enter the search the sky
state to acquire the required data. This data, called almanac data,
can be acquired by receiving just one satellite. A search the sky
operation takes 20 minutes to complete.
The transition state indicates an adequate number of satellites for
navigation has been acquired and is being tracked but no position
data can yet be produced.
Normal navigation is indicated by a NAV, NAV A, or NAV D GPS
state. NAV A indicates that the altitude input is being used in the
position solution. NAV D indicates that besides calculation position,
the receiver is collecting and storing in its memory additional data
from the satellites (called ephemeris and almanac data).
Lines 3 and 4 of the OTH 1 page display the KLX 135A’s estimated
position error. The KLX 135A’s position error depends upon such
factors as the number of satellites being received, the strength of the
GPS signals, and the geometry of the
satellites presently being used for
navigation.
Figures 3-169, 3-170 and 3-171 show
a representative example of a set of
OTH 2 pages. There will be three
OTH 2 pages if more than six
satellites are being received as in this
example. The following information is
displayed for each satellite on the
OTH 2 pages:
• The specific GPS satellites or
“space vehicles” (SV) being
received are displayed in the left
column. Each satellite has its
own identification number. A *
symbol to the right of the satellite
Basic GPS Operation
3-58 Effective Date 5/95 006-08789-0000 Rev 0
Basic GPS Operation
Chapter 3
APT VOR NDB SUP ACT NAV FPL CAL SET OTH
118.00 SV Hlt SNR Ele
136.97 02 Good 41 43°
>Leg 11 Good 32 07°
OTH+2 16*Weak 31 76°
Figure 3-169
APT VOR NDB SUP ACT NAV FPL CAL SET OTH
118.00 SV Hlt SNR Ele
136.97 18 Good 39 21°
>Leg 20 Good 47 88°
OTH+2 23*Good 34 09°
Figure 3-170
APT VOR NDB SUP ACT NAV FPL CAL SET OTH
118.00 SV Hlt SNR Ele
136.97 25 Good 41 52°
>Leg
OTH+2
Figure 3-171