METHOD AND SYSTEMS FOR MAINTAINING A POSITION DURING HOVERING OPERATIONS

摘要

A method for maintaining a position of a hovering vehicle (10) that incorporates a radar altimeter (100) is described. The method includes receiving signals at the radar altimeter based on a change of horizontal direction, operating the radar altimeter to generate a Doppler frequency spectrum based on the received signals, and determining a change in vehicle direction and velocity which will reduce a width of the Doppler frequency spectrum of the received signals. A radar altimeter which generates the Doppler frequency spectrum is also described.