Method of active sonar detection of a stationary target

Details Method of active sonar detection of a stationary target Method of active sonar detection of a stationary target

1990-09-28

1991-10-01

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

G01S 1500

Patent

active

050540041

ABSTRACT:
A method of active sonar detection of a stationary target in the water from board a moving vessel. A moving vessel having an active sonar system transmits a series of sonic pings out into the water. The transmitted series generates a corresponding series of reflections. Each of the reflections contains 1) acoustic reverberation and noise, 2) reflections from moving objects and 3) reflections from a stationary target. Each of the reflections in the series is digitized and stored in a matrix memory. The reflections are shifted in the matrix memory based upon how fast the vessel is travelling between successive pings. Each of the columns in the matrix memory are then summed such that the summation attenuates the acoustic reverberation and noise as well as the reflection from any moving objects and generates an indication of the stationary target.

REFERENCES:
patent: 3928839 (1975-12-01), Warner et al.
patent: 4634947 (1987-01-01), Magori

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