Section 4 - GPS receivers
PAGE 12
05/01/97 REV H
Acquisition time
•
60 seconds typical Time-To-First-Fix (TTFF) with current almanac
Reacquisition time
•
< 1 second typical to re-acquire (5-second obscuration)
•
< 3 seconds typical to re-acquire (60-second obscuration)
Sensitivity
•
-124 to -130 dBm (antenna input level)
Coarse acquisition
•
C/A code (1.023 MHz chip rate — code and carrier phase tracking)
Environment
•
Operating temperature: Zero to 55
°
C
•
Relative humidity: 95 percent (non-condensing)
4.1.3 Operating
modes
The 8700 automatically switches between six operating modes:
•
Self-test
•
Initialization
•
Acquisition
•
Navigation (includes four sub-modes: differential 3-D, differential
2-D, 3-D nav, and 2-D altitude-hold)
•
Dead reckoning
•
Fault
FIGURE 2 - 8700 ALLSTAR engine operating modes
The six modes are described in detail below.
Summary of Contents for 8700
Page 2: ......
Page 10: ......
Page 16: ...Section 2 Introduction PAGE 6 05 01 97 REV H ...
Page 20: ...Section 3 Packaging PAGE 10 05 01 97 REV H ...
Page 32: ...Section 6 GPS beacon combination receivers PAGE 22 05 01 97 REV H ...
Page 46: ...Section 8 Input output configurations PAGE 36 05 01 97 REV H ...
Page 52: ...Section 9 Connector pinouts PAGE 42 05 01 97 REV H ...
Page 76: ...Section 12 8X00 engine monitor program PAGE 66 05 01 97 REV H ...
Page 78: ...Section 13 Glossary PAGE 68 05 01 97 REV H ...
Page 80: ...Section 14 Abbreviations and initialisms PAGE 70 05 01 97 REV H ...
Page 85: ...Index 05 01 97 REV H PAGE 75 ...