Linearizing device for a frequency-modulation ramp and its application to a radio altimeter

摘要

The invention relates to a device for the linearization of a frequency modulation ramp comprising a voltage controlled oscillator associated with a phase locked-loop. The device comprises a digitally controlled oscillator of which only the most heavily weighted bit is used, and a digital phase comparator receiving, on the one hand, said most heavily weighted bit and, on the other hand, a signal supplied by the voltage controlled oscillator.;Application to very high linearity and very high accuracy radio altimeters.