Accession Number:

ADD005966

Title:

Measuring the Speed of an Aircraft.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON D C

Report Date:

1979-03-13

Pagination or Media Count:

6.0

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. Author

Subject Categories:

  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE