INS & GPS

Question 1

What does INS stand for?

Answer 1

Inertial Navigation System

Question 2

What is the basic principle of INS?

Answer 2

If you know where an aircraft starts from, and how far it has subsequently moved in any given direction, then you will also know it’s current position.

Question 3

Define INS

Answer 3

INS is a stand-alone system using accelerometers on a gyroscopic platform to calculate movement in all 3 dimensions.

Question 4

What are the four criteria that GNSS performance is based on?

Answer 4

Accuracy
Integrity
Continuity
Availability

Question 5

What are some sources of Errors for GNSS?

Answer 5

Ionosphere and Troposphere Delays
Orbital Errors
Receiver Clock Errors
Number of Satellites Visible
Signal Multi-Path

Question 6

What systems are available to correct GNSS Errors?

Answer 6

ABAS - Airborne Based Augmentation System (RAIM)
GBAS - Ground Based (Differential GPS)
SBAS - Satellite Based (WAAS, EGNOS)

Question 7

What is a DGPS and how does it work?

Answer 7

Differential GPS. A Ground Based Augmentation System to correct GNSS Errors.

A GPS Receiver is placed at a known location and therefore can detect errors in satellite signals.

Question 8

What is RAIM and how does it work?

Answer 8

Receiver Autonomous Integrity Monitoring. An Airborne Based Augmentation System to correct GNSS Errors.

Explain Here

Question 9

What is the ICAO standard for GBAS?

Answer 9

Local Area Augmentation System (LAAS)