The radioaltimeter is an instrument that uses radio waves to determine the altitude of an airplane. When working, the transmitter of the radio altimeter transmits a radio signal to the ground, which is reflected by the ground and received by the receiver.
According to the time interval from transmission to reception and the propagation speed of radio waves, the altitude is indicated by the indicator. The transmitter transmits a radio signal to the ground when it is working, and is received by the receiver after being reflected by the ground. The indicator indicates the altitude of the camera station relative to the ground at each shooting moment, and it is automatically recorded on a special film while the aerial camera is exposed. .
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