Random 3 Flashcards
How many GNSS satellites does a GNSS receiver use to compute its position?
At least four.
What are the two types:
1) Navigation database: Contains elements from which flight plan is constructed e.g. NAVAIDS, air routes etc.
2) Performance database:
Information relevant to managing the flight plan such as maximum take-off weight, fuel weight, altitudes etc.
State and advantage and disadvantage of INS.
•It is completely self contained and does not rely on any external aids or visibility conditions. It can operate in tunnels or underwater as well as anywhere else.
• It is immune to jamming and inherently stealthy. It neither receives nor emits detectable radiation and requires no external antenna that might be detectable by radar.
• Instantaneous output of position and velocity.
Some Disadvantages of INS
• Due to small inaccuracies in the measurements the velocity error and, with that, the position errors grow over time.
• Equipment is expensive to maintain and repair.
•Initial alignment is necessary.
Name five factors that determine the type of navigation used.
• Destination
• Duration of flight
• Time of departure
• Type of aircraft
• On-board navigation equipment • Ratings and currency of pilot
• Expected weather
The process GNSS satellites use to deliver position estimates is called?
Trilateration
What are some advantages of PBN?
- Environmentally Friendly
- Reduces fuel costs.
- Reduces investment in ground based systems.
- Reduces time in flight through more direct routes.
What are time zones?
Geographical world glove division of 15° each starting at Greenwich in England created to help people know what time it is now in another part of the world.
If Local time (LMT) is ahead of UTC is longitude east or west ?
East.
What is true North?
The direction from any point along a meridian towards the North Pole.
(Also called geographic north)
What are the different ways in which variation is represented?
Statement in words
Isogonals
Compass rose
Marginal diagram
What is compass North?
The uncorrected direction indicated by the north seeking end of a compass needle.
What is magnetic north?
The direction in which the north end of a compass needle or other freely suspended magnet will point in response to the earth’s magnetic field.
The angle between True North and Magnetic North is known as…
the Angle of Variation.
If drift is to the left (port), track angle is less than heading angle. True or false?
True.
If drift is to the right (starboard), track angle is less than heading angle. True or false?
False. Angle is greater than heading angle.
