We are going to elaborate on principles of radar altimeters.Let's start.
Radar altimeter is a device which compute the altitude of airplane by using the radio wave.It mesausures the time differences between sending radio wave to the earth and echoing back to the airplane whereupon it takes the time and indicates the altitude of aircraft by using the sound velocity.
Transmitters and receivers are located on fuselage or under the wing.There are two types of altimeter,one of them is High Radio Altimeter and the other is Low Altitude Radio Altimeter.High Radio Altimeters are used for cruise.Going and coming signal times are measured,altitude is found by using h=c*t/2 formula eventually.Error margin is -+50ft.As we said the other types of altimeter are Low Altitude Radio Altimeters that are used generally for instrument landings.Coming and going signal times are compared and measured by shock.Operation frequency is between 4200-4400.Capability of transmitter is 0.5 W and its range is 2500ft.Error margin is -+2ft between 0-500ft altitude and +-%5 of its altitude between 500-2500ft.As you see,Low Radio Altimeters are more sensitive than High Altitude Altimeters.
Radar altimeter is a device which compute the altitude of airplane by using the radio wave.It mesausures the time differences between sending radio wave to the earth and echoing back to the airplane whereupon it takes the time and indicates the altitude of aircraft by using the sound velocity.
Transmitters and receivers are located on fuselage or under the wing.There are two types of altimeter,one of them is High Radio Altimeter and the other is Low Altitude Radio Altimeter.High Radio Altimeters are used for cruise.Going and coming signal times are measured,altitude is found by using h=c*t/2 formula eventually.Error margin is -+50ft.As we said the other types of altimeter are Low Altitude Radio Altimeters that are used generally for instrument landings.Coming and going signal times are compared and measured by shock.Operation frequency is between 4200-4400.Capability of transmitter is 0.5 W and its range is 2500ft.Error margin is -+2ft between 0-500ft altitude and +-%5 of its altitude between 500-2500ft.As you see,Low Radio Altimeters are more sensitive than High Altitude Altimeters.
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