Airborne radio altimeter device based on frequency modulated continuous waves

The invention discloses an airborne radio altimeter device based on frequency modulation continuous waves, and relates to the technical field of radio distance measurement. The device comprises a transmitting unit and a receiving unit, wherein the transmitting unit comprises a waveform generation module, a spread spectrum module, a linear frequency modulation module, a frequency hopping module, a time control module and a transmitting antenna module; the receiving unit comprises a receiving antenna module, a de-spreading module, a frequency hopping and de-hopping module, a synchronization module, a difference frequency module and a height measurement module; the spread spectrum module is used for generating a pseudo-random sequence and forming a pulse modulation signal; the linear frequency modulation module forms a broadband frequency modulation signal under the action of the time control module; the frequency hopping module is used for converting the broadband frequency modulation signal into a frequency ho