(E) Inertia Navigation System

Question 1

Disadvantages of Radio Navigation System (RNS)

Answer 1

Require extensive network of ground stations

Subjected to man-made and natural interference

Question 2

Advantage of Inertia Navigation System (INS)

Answer 2

Self-Contained

Insensitive to acceleration errors

Question 3

INS provides information on?

Answer 3

Position
Velocity
Heading
Course
Course Deviation

Question 4

Ring Laser ‘Gyro’s have no rotating parts, hence they are?

Answer 4

more reliable, easier to maintain, and have a low life-cycle cost.

Question 5

Accelerometers

Answer 5

• Movement of A/C causes displacement from Null point of the pendulum
• Error signal current applied to torque ‘motor’ to restore to nll
• Current is a function for A/C acceleration > Integrated to find Velocity/Distance

Question 6

Transport Rate

Answer 6

Is the movement of A/C platform parallel to Earth’s surface, must be compensated for. As earth rotates at 15.04 degree/h, the Rotation Rate is taken into account and compensated for as well.

Question 7

RLGs: Integrated platform

Answer 7

• 3 Laser Gyros with the accelerometers mounted on a platform = Inertial Sensor Assembly
• The sensors outputs fed to Navigation computer, which corrects for errors
• The final processed data gives Position, Velocity, Attitude, Acceleration and movement rates