Lecture 8: Reconstruction and Simulation

Question 1

Why reconstruct the trajectory?

Answer 1

Investigation tool
* Sequence of events
* Visualization tool
* Aircraft performance/simulation
* Human factors

Communication tool

Question 2

Trajectory reconstruction methods

Answer 2

GNSS
* Dead reckoning
* Pure inertial
* Radar (range and azimuth)
* Blended (data fusion, Kalman filtering

Question 3

calibrated air speed (see notes)

Question 4

Euler rotation matrix (see notes)

Question 5

Braking performance

Answer 5

optimal slip
anti-skid
surface texture
wet surface

Question 6

INS : inertial navigation system

Answer 6

good precision
poor accuracy

Question 7

differential GPS

Answer 7

good precision
good accuracy

Question 8

INS Aided Differential GPS

Answer 8

kalman filter -> fuse INS and DGPS
precision very good
accuracy very good

Question 9

dead reckoning method
primary inputs

Answer 9

IAS/CAS
magnetic heading
wind direction
wind speed
pressure altitude
static air temp

Question 10

pure inertial

Answer 10

inputs: x,y,z body - axis acceleration
Euler angles : yaw, pitch, roll