Tch air navigation way point6/20/2023 Occasional service interruptions and altitude inaccuracies of the GPS system pose no problem for IRS/GPS. GPS also feeds data into the IRS computer to be used for error correction. The GPS is used to initialize the IRS so the pilot no longer needs to do so. When combined with IRS, it creates one of the most accurate navigation systems available. The most modern IRS integrate is the satellite GPS. The accelerometer and gyro output are input to the computer for continuous calculation of the aircraft’s position. The use of three solid-state accelerometers, one for each plane of movement, also increases accuracy. This eliminates precession and other mechanical gyro shortcomings. Three-ring, laser gyros replace the mechanical gyros in the older INS platform systems. They are completely solid-state units with no moving parts. Integration with other NAV aids is also possible to ensure continuous correction and improved accuracy but is not required. Waypoints can be entered for a predetermined flightpath and the INS will guide the aircraft to each waypoint in succession. INS is integrated into an airliner’s flight management system and automatic flight control system. An interface control head is used to enter starting location position data while the aircraft is stationary on the ground. This averts the introduction of errors that may result from acceleration due to gravity.Īn INS uses complex calculation made by an INS computer to convert applied forces into location information. In older units, they are mounted on a gyro-stabilized platform. A minimum of two accelerometers is used, one referenced to north, and the other referenced to east. The location of the aircraft is continuously updated through calculations based on the forces experienced by INS accelerometers. The system derives attitude, velocity, and direction information from measurement of the aircraft’s accelerations given a known starting point. An INS/IRS is a self contained system that does not require input radio signals from a ground navigation facility or transmitter. This may also be identified as an inertial reference system (IRS), although the IRS designation is generally reserved for more modern systems. An inertial navigation system (INS) is used on some large aircraft for long range navigation.
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