Doppler radar/ultrasonic hybrid height sensing system

Details Doppler radar/ultrasonic hybrid height sensing system Doppler radar/ultrasonic hybrid height sensing system

1991-11-07

1993-04-27

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Combined with diverse type radiant energy system

367 99, G01S 1386

Patent

active

052066525

ABSTRACT:
A height measurement system uses an inexpensive ultrasonic height measuring evice to provide an apparent height of a descending airborne object. To compensate for movement of the object during the ultrasonic measurement, a Doppler radar velocity measuring device determines the vertical velocity in a short measurement period. The measured vertical velocity is used to determine the vertical distance travelled during the ultrasonic measurement and to compensate therefor by converting the apparent height to a true height of the descending object. Updates of the true height may be obtained by storing the vertical velocity and retrieving the vertical velocity for multiplication by a time value to obtain an updated value of the true height.

REFERENCES:
patent: 3707717 (1972-12-01), Frielinghaus

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