High resolution acoustic navigation system

Details High resolution acoustic navigation system High resolution acoustic navigation system

1977-08-31

1979-11-27

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Transponders

With plurality of transponders

367 3, G01S 518

Patent

active

041763386

ABSTRACT:
A high resolution underwater acoustic navigation system is provided by a combined pulse and continuous-wave or Doppler system. Locations of the object being tracked are periodically determined by the pulse subsystem and are used to initialize the Doppler subsystem. The Doppler Subsystem tracks the location from the fix obtained by the pulse subsystem. Both subsystems are interfaced with a central processing unit or digital computer and the data rate input to the computer is substantially reduced by the use, in the Doppler subsystem, of a phase angle quadrant change counter whose accumulated count is periodically provided as an input to the computer.

REFERENCES:
patent: 3421138 (1969-01-01), Moulin et al.
patent: 3860900 (1975-01-01), Scudder
patent: 3928840 (1975-12-01), Spindel et al.
patent: 4017823 (1977-04-01), Cooke et al.
Ragland, Ocean Science and Ocean Eng., Marine Tech. Soc., Amer. Soc. Limnol. Oceanogr., vol. 2, 1965, pp. 1145-1161.
Mourad et al., EOS Trans. Am. Geophysics Union, No. 53, 1972, pp. 644-649.

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