INS
Components (4)
What are:
- accelerometers
- stable platform
- computers
- CDU
Components (2)
What are:
- IRU
- MSU
Transponders provide this information
What is A/C ID and altitude
RMI displays compass bearing to this type of navaid, and magnetic bearing to this other type
What are:
- ADF (compass bearing)
- VOR (magnetic bearing)
WAAS
What is Wide Area Augmentation System
i.e. a ground reference Rx that is used to eliminate GPS errors
Advantages of INS integration (2)
What is:
- improved accuracy
- higher mission completion rate (cuz sensors used independently)
Modes of operation (4)
What are:
- OFF
- ALIGN
- NAV (uses align info to calculate Px, velocity, hog, altitude)
- ATTITUDE (selected when A/B to output the nav solution)
Military codes (3)
Civilian codes (3)
Special mode codes (3)
What are:
- military (1, 2, 4)
- civilian (3/A, 3/B, 3/S)
- 7500 (hijack), 7600 (comms nix), 7700 (emerg)
This type of navaid has a range of 50-200NM, and is subject to atmospheric interference
What is the ADF
Sources of GPS errors (2)
What are:
- user range error (largest source comes from atmospheric modelling errors)
- dilutions of precision (from fix geometry < 90o)
10 initial conditions for alignment
What are:
- 2 initial Px
- 2 initial velocities
- 3 initial orientations
- 3 orientation rates
This is provided during NAV mode
What is inertial Px reference for the A/C
Which includes:
- A/C & inertial attitude
- body rates & accelerations
- velocity vectors
- Px
- TH & MH
- wind date
ADS Components (4)
What are:
- 2 pitot tubes
- 2 static ports
- 2 temperature bulbs
- 2 DADCs
This type of NAVAID has a range of LOS, and a 60-110o cone of confusion
What is a TACAN
The CT-142 GPS uses this type of code receiver, and provides these 6 things via an emulated GPS
What is a C/A code Rx and
- Px & time
- satellite info
- altitude
- ground track
- G/S
- TAS
5 steps of self-alignment
What are:
1- warm up
2- coarse leveling
3- coarse alignment
4- fine leveling
5- fine alignment
These conditions prevent alignment (2)
What are:
- if the A/C is moving
OR
- if current Px is > 1 degree from last stored Px
How RADALT works
What is:
- A/C transmits a pulse that is reflected back from the ground
- time difference between sent/received signals is converted to height above terrain
GPS Code characteristics:
- available to all users
- 1.023 MHz transmission rate
- used to acquire the other code
- less accurate
What is the C/A code
ADS components (4)
What are:
- 2 pitot tubes
- 2 static ports
- 2 temperature bulbs
- 2 DADCs
High latitude alignment problems (2)
What are:
- undetectable tilt
- cannot resolve TN
Warning light indicates either of these 2 conditions
What are:
- system malfunction preventing alignment
OR
- latitude inaccurate by > 1/2 degree
Range of the CT-142 RADALT
What is:
0-2500FT AGL
GPS Code characteristics:
- available to military users
- 10.23 MHz transmission rate
- used for nav ranging
- more accurate
What is the P code
How the ADS works
What is:
- pitot tubes detect total pressure
- static ports detect static pressure
- airspeed indicator finds differential pressure (from static and pitot pressure) to determine IAS
- temp bulbs measure OAT