68 Emulated GPS 5

Question 1

CT-142 GPS

Answer 1

Single channel rapid sequencing C/A code receiver
Part of the UNS-1C FMS
Antenna and GPS computer card
Initialized through #1 FMS

Question 2

CT-142 GPS Inputs

Answer 2

Aircraft GPS to Emulated GPS
GPS position
Time
Satellite information
System status
Altitude
Ground speed
Ground track
TAS (from DADC)

Question 3

GPS Outputs

Answer 3

Emulated GPS to User interface
LCD display
Provides
Position and time
Satellite information (how many satellites are visible, how many the GPS is tracking and which satellites they are)
Altitude
Ground track
Ground speed
TAS

Question 4

NTS GPS Theory of Operation

Answer 4

TMT will allow operator to interact with one of six emulated GPS
Each GPS is capable of initialization, data entry, and navigation and maintains its own database of navigation information
There is only one aircraft GPS and the emulated GPS in no way affects the actual operation of the UNS-1C GPS card
The emulated GPS reflects the actual status and current data of the aircraft GPS on each emulated CDU and DID, when applicable. The emulated GPS is able to store 20 waypoints

Question 5

Degraded operations
3 satellites
Failed

Answer 5

GPS with 3 satellites:
Altitude information no longer available
GPS failed
GPS position become erratic and varies randomly with large errors
Time on NTS continues to operate