INS, IRS and Nav Systems

Question 1

Inertial system errors can be described as…

Answer 1

• Bounded
• Unbounded

Question 2

The Schüler Error causes error in which two INS systems?

Answer 2

• Stable Platform
• Strapdown

Question 3

The acceleration axes are, and aligned to?

Answer 3

• North/South - X Axis
• East/West - Y Axis
• Vertical Alignment - Z Axis

Question 4

What is a stable platform?

Answer 4

Mounted always level and aligned to north measuring acceleration related to the platform

Question 5

What is a wander angle system?

Answer 5

Keepings the platform level but not aligned with north detecting how far out of alignment the platform is.

Question 6

What is a strapdown system?

Answer 6

Leveling and alignment are not worried about with the system detecting how far out of level and alignment the accelerometer is from where it was initialised.

Question 7

In a strapdown system there is no longer a need for…….

Answer 7

Rate indicating gyros

Question 8

A computing trihedron in a Strapdown IRU consits of?

Answer 8

• Three ring lasor gyros to detect roll, yaw and pitch
• Three orthogonally mounted accelerometers

Question 9

The Variation map in the computer database covers from _____ to _____ latitudes.

Answer 9

60ºS to 73ºN