Which of the following is false with respect to Earth centered inertial coordinate system?

Accuracy is 10-5/hr

Newton�s laws are not valid

Used in mechanizing inertial navigators

Angular coordinates of stars are conventionally tabulated in ECI

Correct Answer : Newton�s laws are not valid

Explanation : The Earth centered coordinate system has three navigational functions. First, Newton’s laws are valid in any ECI coordinate frame, Second, the angular coordinates of stars are conventionally tabulated in ECI. Third, they are used in mechanizing inertial navigators.

Recently Updated in Avionics Questions

What is the technique of calculating position from measurements of velocity called?

Doppler radar

Dead reckoning

Celestial navigation

Secondary surveillance

Correct Answer : Option (B) : Dead reckoning

Explanation : Dead reckoning is the technique of calculating position from the measurements of velocity. It is the means of navigation in the absence of position fixes and consists in calculating the position by extrapolating measured ground speed.

The angle of arrival, relative to the airframe, of a radio signal from an external transmitter is called _________

Bearing

Phase

Heading

Approach angle

Correct Answer : Option (A) : Bearing

Explanation : The angle of arrival, relative to the airframe, of a radio signal from an external transmitter is called bearing. Bearing is measured by the difference in phase or time of arrival at multiple antennas on the airframe.

________ related ranging errors to the dispersion in measured position?

APEG

GDCP

GEOP

GDOP

Correct Answer : Option (D) : GDOP

Explanation : GDOP or Geometric Dilution of Precision relates ranging errors to the dispersion in measured position. If three range measurements are made in the orthogonal direction, the standard deviation in the aircraft’s position error is the same as those of the three range sensors.