| 摘要 |
The velocity measuring system uses at least 3 radar beams directed against the ground at given angles with the measured echo signals processed to obtain the aircraft velocity components in 3 coordinate directions. The inertial vertical velocity component (V12) provided by a baro-inertial regulating loop (2,3,7,4) is compared with the vertical velocity component (VD2) provided by the Doppler frequencies, to obtain an error signal. Pref. the inertial velocity component (V12) is obtained by integration of the signal provided by a vertical acceleration indicator with the integrated signal (V12) fed to a comparator (5) for comparison with the vertical velocity component provided by the Doppler radar system, with an error indicated when the comparator output is above a given threshold value.
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