INERTIAL NAVIGATION SYSTEM PRINCIPLES

Question 1

1 To obtain heading information from a Gyro Stabilised platform, the gyros should have:

Answer 1

2 degrees of freedom and a horizontal axis

Question 2

An INS platform is kept at right angles to local gravity by applying corrections for the effects of:

Answer 2

Aircraft manoeuvres
earth rotation
transport wander
coriolis

Question 3

Gyro-compassing in an INS:

Answer 3

c. is not possible in flight as the accelerometers cannot differentiate between acceleration due to aircraft movement and initial alignment errors

Question 4

4 In an Inertial Navigation System (INS), Ground Speed (GS) is calculated:

Answer 4

b. by integrating measured acceleration

Question 5

5 In an Inertial Navigation System, what is the output of the first stage North/South integrator?

Answer 5

c. velocity along the local meridian

Question 6

6 What measurement is used to carry out alignment of an Inertial Navigation System?

Answer 6

a. acceleration sensed by the east gyro horizontal accelerometer

Question 7

7 Which of the following equipments does not use information from external sources in flight?

Answer 7

a INS / IRS

Question 8

8 In an INS, what is the output of the E/W second-stage integrator?

Answer 8

c. Distance E/W

Question 9

9 Double integration of the output from the East/West accelerometer of the Inertial Navigation System when in NAV mode gives:

Answer 9

a. Distance E/W

Question 10

10 When is the last point at which an INS or IRS may be selected to NAV mode?

Answer 10

b. Immediately prior to push back or taxy from the gate

Question 11

11 At the second stage of integration E/W speed is converted into E/W distance gone. To convert this departure into change of longitude it has to be:

Answer 11

b. multiplied by Secant of the latitude.