Measuring the speed of an aircraft

Details Measuring the speed of an aircraft Measuring the speed of an aircraft

1977-10-26

1979-03-13

Ruehl, Charles A.

Measuring and testing

Navigation

Ship's log

73194A, 73189, G01P 500, G01F 166

Patent

active

041435486

ABSTRACT:
A continuous wave ultrasonic wave transmitter transmits modulated waves in two opposite directions being intercepted by a forward receiver and an aft receiver. The received signals are demodulated and the relative phase is used to obtain a speed reading. The wave length of the modulator signal must be larger than the two, preferably equal transmitter-to-receiver spacings. A similar but orthogonally arranged receiver system permits acquisition of a speed vector. Different modulation frequencies are to be used for different speed ranges; all these frequencies are transmitted simultaneously and selection of the desired one is made in the processing circuit only.

REFERENCES:
patent: 2274262 (1942-02-01), Wolff
patent: 2480646 (1949-08-01), Grabau
patent: 2515221 (1950-07-01), Henning
patent: 3861211 (1975-01-01), Dewan

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