20
ZY-12 GPS Receiver
Screen 0 - Skysearch Information
Screen 0 (Figure 3.1) displays the status of the satellites that the receiver finds as
it performs a sky search. The number in the lower right corner identifies the
screen. Table 3.2 describes the screen parameters.
Figure 3.1.
Screen 0 - Skysearch Information
Table 3.2.
Screen 0 - Skysearch Parameters
Parameter
Description
SVS FOUND
Reports the number of satellites located
02:26:44
Hours, minutes, and seconds are reported in the upper right in 3 stages.
Before it locks on a satellite, the receiver displays time elapsed since you
first turned it on. After it locates the first satellite, it reads the satellite time,
sets its internal clock, and reports GPS time. After it finds several satellites
and collects GPS-to-UTC parameters, it changes to GMT.
CHAN
Contains the channel numbers for the associated satellites.
PRN
PRN number of each satellite being searched for. If lock is not acquired on a
satellite after 2 minutes, a new satellite cycles into its channel. If the SV
PRN numbers are displayed in reverse video (blue numbers in a white box),
then the receiver is in Z-mode.
STAT
Current status of each C/A code channel.
When the receiver finds a trace of a satellite signal, it reports SN. It has
detected some kind of signal; if not a satellite signal, the receiver continues
the search.
When a signal proves to be a satellite signal, the receiver reports LK (locked
on), and then reads the satellite's ephemeris and almanac files. Status
generally changes to LK within 2 minutes of operation.
