Radar radio altimeter system using frequency-modulated continuous waves

摘要

the fm / cw radar type wave, is approximately linear in frequency between two frequencies f1 and f2, and provides a first signal lead (fbi) between emitted and received waves; it is designed for the measurement of height h as the total rotation phase.according to the invention, the radar provides a second pulse signal (fb2) in quadrature with the first signals fb1 and fb2) are digitized (23 to 26) and means (36) are compared for fb1 and fb2 successive samples.then computing means (37) derived by successive du00e9cru00e9mentations incru00e9mentations - the number of crossings of the lines of a predetermined phase minus the number of traversed in the opposite direction (from). the calculated altitude h is proportional to.