Different INS And GPS

Different INS And GPS

4 Posts

  • In relation to RNAV (Area Navigation) systems, describe the difference between INS (Inertial Navigation Systems) and GPS..
  • INS is an independent, on-board system. Its accuracy will primarily depend on the initial position of the aircraft input on the ground before the aircraft moves. Subsequent positions and other parameters are updated using gyroscopes and accelerometers.
    GPS is not an on-board system. It has receivers on board the aircraft, however the position is being updated using space vehicles such as satellites. So accuracy will depend on the functioning of the space vehicles. Position is updated using fixes from 3 or more independent space vehicles.
  • the error in an INS system will be the least at the time of departure, and will keep increasing as the journey progresses.whereas for GPS the error will be fairly constant throughout the flight.
  • In relation to RNAV, P-RNAV/RNP-1 operations require a GPS or a VOR/DME.
    For RNP-10, one GPS is required for flight time outside radio coverage and GPS is a compulsory requirement for RNP-4
    One IRS is required for RNP-5 operations whereas 2 IRS are needed for RNP-1/4/10 operations
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