Version 1.5
147
Appendix C - Engineering Mode
Operation & Installation Manual
Columns 1 & 5:
represents the PRN number assigned to a specific
receiver channel; a PRN number of 0 indicates there are no
satellites available to track on that channel.
Columns 2 & 6:
represents the current receiver channel status:
-1 or 1: the receiver channel is unlocked and searching for a
satellite.
2: the receiver channel found a carrier signal and is attempting
to
Frame
, or synchronize, on the ID pattern and message
frame boundaries of the satellite. It is not unusual for this
value to go from a 2 back to a 1 because it is possible that
the wrong carrier for the identified satellite was found.
3: the receiver channel found the correct carrier for the satel-
lite identified and is collecting the satellite ephemeris. A
new ephemeris is collected once a satellite is first acquired
and once an hour thereafter.
4: the receiver channel is decoding the navigation data from
the satellite.
Columns 3 & 7
:
Receiver status = -1 or 1: represents the amount of time the
receiver channel has been using a particular oscillator off-
set, when a 2 digit value is displayed. After about 10 to 30
seconds, depending on the receiver mode, the timer re-
sets to 0, and another oscillator offset is used to find a
carrier. This procedure is followed until a GPS carrier is
found.
If the receiver was tracking satellites and has since dropped
one or all of them, the value displayed is the channel time
which is maintained by the navigator processor. As more
time passes between tracking the satellites, more error is
introduced into this time. It is not unusual to see several
seconds of separation between channel times in this mode.
This will be corrected when a satellite is picked up and
the receiver reverts to mode 3 or 4.
Receiver status = 2: The oscillator value begins adjusting to
the center frequency of the carrier, but the counter contin-
8/13/01, 11:07 AM
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Содержание apMK12
Страница 1: ...Operation Installation Manual apMK12 Navigation System 8 13 01 11 42 AM 1...
Страница 13: ...viii Version 1 5 Operation Installation Manual Table of Contents 8 13 01 11 12 AM 8...
Страница 19: ...6 Version 1 5 Operation Installation Manual DGPS 8 13 01 11 30 AM 6...
Страница 93: ...80 Version 1 5 Operation Installation Manual Man Over Board 8 13 01 11 31 AM 80...
Страница 195: ...182 Version 1 5 Installation Manual Appendix G Technical Specifications 8 13 01 11 08 AM 182...
Страница 216: ...Place Stamp Here Leica Geosystems Inc 23868 Hawthorne Blvd Torrance CA 90505 USA 8 13 01 11 08 AM 204...