Aircraft Axes and Acceleration Measurement

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What is the purpose of the accelerometers in an Inertial Navigation System?

To calculate the aircraft's velocity and position (correct)

To provide an electrical signal to the torque motor

To measure the aircraft's altitude

To control the aircraft's attitude and heading

How does the stable platform remain accurately aligned to the aircraft axes?

Through the use of rate gyroscopes

Through the use of servomotor systems and a gimbal system (correct)

Through the use of accelerometers

By being fixed to the aircraft's structure

What is the function of the rate gyroscopes on the stable platform?

To measure the aircraft's velocity

To control the torque motor

To detect any displacement of the platform from its reference position (correct)

To provide an electrical signal to the accelerometers

What is the purpose of the torque motor in the stable platform system?

To drive the platform back to its reference position Signup and view all the answers

What is the Inertial Navigation Unit (INU) part of?

The Inertial Navigation System (INS) Signup and view all the answers

How many components make up a single Inertial Navigation System (INS)?

5 Signup and view all the answers

What is the primary factor that determines the liability of error of the radio compass?

ratio of indirect to direct waves in the received signal Signup and view all the answers

What is an advantage of a GPS receiver module in a strapdown IRU?

It removes the need for the aircraft to be held stationary for inflight alignment Signup and view all the answers

What is the approximate range of an NDB over land where the ground wave transmission dominates?

60 miles Signup and view all the answers

What is the primary function of radio navigation equipment?

To provide position information to the pilot Signup and view all the answers

What causes the night effect on radio compass readings?

Increased strength of indirect waves at night Signup and view all the answers

What is the result of the IRU filling in for GPS outages?

Seamless continuation of navigation Signup and view all the answers

What happens to the bearing indications as the distance from the NDB increases?

They become erratic Signup and view all the answers

What is the term for the effect of terrain on the useful range of an NDB?

Coastal refraction Signup and view all the answers

Why do older systems and long-range navigation systems use lower frequency bands?

Because they are based on the age of the system and navigation requirement Signup and view all the answers

What is the advantage of an IRU providing a continuous high-bandwidth measurement of position and velocity?

It provides a more accurate measurement of position and velocity Signup and view all the answers

At what times are errors in radio compass readings particularly pronounced?

During sunrise and sunset Signup and view all the answers

In what type of weather conditions can radio navigation equipment be used?

In all weather conditions Signup and view all the answers

What is the primary function of the GPWS computer?

To receive and process data from various aircraft systems Signup and view all the answers

What is the purpose of the 'whoop whoop pull up' warning message?

To alert the pilots of a possible collision with terrain Signup and view all the answers

Which system provides the GPWS computer with glideslope deviation data?

VHF navigation system Signup and view all the answers

What is the typical output of the GPWS computer?

Aural announcements and visual warning indicators Signup and view all the answers

What is the primary source of altitude data for the GPWS computer?

RADALT system Signup and view all the answers

What is the purpose of the barometric rate of change of altitude data in the GPWS?

To determine the aircraft's descent rate Signup and view all the answers

What is the primary purpose of using four or more satellites in GPS navigation?

To improve accuracy and provide precise altitude information Signup and view all the answers

What is the constant speed used in GPS calculations?

300 000 000 meters per second Signup and view all the answers

What is the purpose of the coded signal emitted by each satellite?

To contain the exact timing of the signal emission to Earth Signup and view all the answers

Why is an atomic clock not necessary in GPS receivers?

Because the satellites' atomic clocks are sufficient Signup and view all the answers

What is the minimum number of satellites required to determine a receiver's position using three-dimensional trilateration?

Three Signup and view all the answers

What is the advantage of using four satellites instead of three in GPS navigation?

Improved accuracy and precise altitude information Signup and view all the answers