Title:
SONAR SIGNAL PROCESSING DEVICE
Document Type and Number:
Japanese Patent JPH0643238
Kind Code:
A
Abstract:
PURPOSE: To identify the target emitted sound and noises even if their reception levels are nearly the same in a passive sonar system.
CONSTITUTION: The received signal 5 obtained from a receiver 1 is staggered by the time length τ by a high-speed Fourier transformer 2, and it is extracted by the preset time length T to determine the amplitude spectrum 6 in sequence. The amplitude spectrum 6 is integrated by frequency in the time length T0 by a pre-processing device 3, the peak value is standardized to 1, the obtained amplitude spectrum 7 is used as the input data to a neural network 4, and the neural network 4 identifies whether the received sound is the target emitted sound or noises based on the learning by back propagation.
Inventors:
ARINAGA SHINJI
MIYAMOTO SHINICHI
YAMAURA TSUYOTOSHI
MIYAMOTO SHINICHI
YAMAURA TSUYOTOSHI
Application Number:
JP19947592A
Publication Date:
February 18, 1994
Filing Date:
July 27, 1992
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
F42B19/01; G01S7/52; G01S7/526; (IPC1-7): G01S7/52; F42B19/01
Attorney, Agent or Firm:
Toshiro Mitsuishi (1 person outside)