SECTION FIVE: Checking out the system
957 INSTALLATION MANUAL, Revision C1
Page 35
To see more information about DGPS, on the
GPS POSITION
screen, press the
DGPS INFO
key to display the
DGPS STATUS
screen. Check for low noise levels and mid-range SNR readings.
To display more information about signals received from the
satellites, press the
SAT INFO
menu key.
Figure 14: Satellites on the GPS satellites screen
The satellite map on the
GPS SATELLITES
screen shows the
current location of the satellites in the sky. The 957 displays
GPS satellites as circles; WAAS satellites as hexagons. You can
check the quality of their signals by looking at each satellite’s
Signal-to-Noise Ratio (SNR). The higher the ratio, the better the
quality.
While the U.S. government identifies WAAS satellites by their
pseudo random number (PRN)—a three-digit number ranging
from 120 to 138—the 957 identifies them by two-digit numbers
ranging from 33 to 51. For example, the satellite for the Atlantic
Operating Region (AOR) is PRN 122, which the 957 displays as
35. See Table 4 below for the satellite identification numbers
that may be displayed on the 957’s screen.
Table 4: Satellite identification numbers
PRN
120 121
122
123
124
125
126
127
128
129
ON GPS
SATS
SCREEN
33
34
35
36
37
38
39
40
41
42
PRN
130
131
132
133
134
135
136
137
138
ON GPS
SATS
SCREEN
43
44
45
46
47
48
49
50
51
GPS
satellite
number
WAAS
satellite
number
36
Summary of Contents for 957
Page 28: ...SECTION THREE Installing and wiring the 2201 Page 24 957 Installation Manual Revision C1 ...
Page 34: ...SECTION FOUR Installing and wiring the 2701 Page 30 957 Installation Manual Revision C1 ...
Page 42: ...SECTION FIVE Checking out the system Page 38 957 INSTALLATION MANUAL Revision C1 ...
Page 70: ...APPENDIX A 957 system technical specifications Page 66 957 INSTALLATION MANUAL Revision C1 ...