Tracking System for Underwater Objects.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent relates to a system for tracking with high precision the movement of an underwater object having a sound detecting capability which employs three bottom-moored acoustic signal sources which are generally disposed in a triangular pattern and continuously radiate acoustic signals which are clustered, for example, about 12 kc. The composite signal that is detected is processed so that each radiated signal is subsequently transformed into a pair of quadraturely phased signals which are proportional to the sine and cosine of the input phase angle. These signals are converted to digital form and, thereafter, supplied to a digital computer which determines the inverse tangent of the ratio of these pair of signals. The phase of each signal so determined may be used, for example, to ascertain the slant range changes of the object with respect to a three-dimensional coordinate system.
- Acoustic Detection and Detectors
- Underwater and Marine Navigation and Guidance