Patent ID: 6476759
Filing Date: 2002-11-05
Classification: G01S

Abstract:
A method of calibration designed for an FM/CW type radio altimeter, comprising:injecting an auxiliary saw-toothed signal with a given saw-tooth slope, Td/dF, into a link between a receiving antenna and a mixer, sawteeth of the auxiliary saw-toothed signal being synchronous with sawteeth of a signal produced by a linear oscillator, with a plateau of the sawteeth of the auxiliary saw-toothed signal being offset with respect to a plateau of the sawteeth of the linear oscillator signal by a frequency f, obtaining, by modifying at least one of a duration of modulation of the sawteeth of the linear oscillator signal and a bandwidth dF of the linear oscillator signal, a beat at the frequency f between the sawteeth of the linear oscillator signal and the sawteeth of the auxiliary saw-toothed signal so that a processing device gives a measured height hâ€²; and comparing the measured height hâ€² with a standard height h obtained by computation according to a formula h=f*c*Td/(dF*2), in which is the speed of light.