JPH02147978A - Sonar apparatus - Google Patents

Abstract

PURPOSE:To reduce weight of a hull improving freedom in equipment of an echo sounder receiver by a method wherein vibration noise appearing in output of the wave receiver and vibration noise detected by a vibration pickup are canceled by each other so that component of vibration noise is eliminated. CONSTITUTION:Synthesized signal (S + n0) of acoustic signal S and vibration noise n0 which has passed through a hull 9 whose engine 4 vibration is of transmission function H(Z) is input to an echo sounder receiver 3. A vibration pickup 1 mounted on the hull 9 detects vibration of an engine 4 and makes signal n1 pass through an adaptive filter 5. By making the adaptive filter 5 adaptively operate so that square of difference epsilon between signal (S + n0) detected by the echo sounder receiver 3 and n2 is minimum where output of the adaptive filter is n2, only acoustic signal S with noise due to vibration generated by the engine 4 eliminated is output to signal output 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sonar device used for searching for underwater sound sources.

(Prior Art) Conventionally, in order to avoid picking up vibration noise emitted from an engine or the like, a wave receiver for a sonar device has a vibration-eliminating structure when installed in a crown body.

(Problems to be Solved by the Invention) The above-mentioned method of mounting a wave receiver in a conventional sonar device has a structure for vibration removal (installation of vibration isolating rubber, etc.), so the mounting structure is complicated and heavy. As a result, the weight of the crown body increased, and there were many restrictions regarding the sacrifice of the receiver. Conventional sonar devices have these problems that need to be solved.

(Means for Solving the Problems) Means provided by the present invention to solve the above-mentioned problems are as follows:
A sonar device installed on a ship or other object having an engine or other vibration noise source, which includes a vibration pickup for detecting vibration noise, and a vibration noise input to a receiver and appearing at the output of the receiver. The present invention is characterized by having an adaptive signal processor that cancels the vibration noise detected by the vibration pickup and removes the vibration noise component.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a conceptual diagram showing an embodiment of the present invention installed on a submarine 100.

The vibration pickup 1 detects vibration noise of the engine 4,
The vibration noise is sent to the adaptive signal processor 2.

The adaptive signal processor 2 receives the output of the receiver 3 and the output of the vibration pickup 1, removes the vibration noise that has entered the receiver 3, and generates a pure signal output 10.

FIG. 2 is a block diagram showing the embodiment of FIG. 1 in more detail.

In FIG. 2, the adaptive signal processor 2 is realized by an adaptive filter 5 and a subtracter 6.

A signal (S+no) is input to the receiver 3, which is a combination of the acoustic signal S and the vibration noise no from the engine 4 that has passed through the crown body 9 with a transmission number H(Z). In addition, the vibration pickup 1 housed in the crown body detects the vibration of the engine 4 and passes the signal n1 through the adaptive filter 5, and when the output of the adaptive filter 5 is n2, the signal detected by the receiver 3 is If the adaptive filter 5 is applied and operated so that the square of the difference ε between (S+no) and n2 is minimized, only the acoustic signal S from which noise due to vibrations generated by the engine 4 has been removed will be output as the signal output 10. be done.

(Effects of the Invention) As explained above, in the sonar device of the present invention, the vibration noise picked up by the receiver can be removed by the adaptive signal processor, so there is no need for a structure that prevents the receiver from picking up vibration noise. Become. Therefore, by applying the present invention, the weight of the crown body can be reduced and the degree of freedom in sacrificing the receiver can be increased.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the embodiment in more detail. 1... Vibration pickup, 2... Adaptive signal processor,
3... Receiver, 4... Engine, 5... Adaptive filter, 6... Subtractor, 10... Signal output.

Claims (1)

[Claims] In a sonar device installed on a ship or other object that has an engine or other vibration noise source, there is a vibration pickup that detects vibration noise, and a vibration pickup that detects the vibration noise that is input to a receiver and appears at the output of the receiver. What is claimed is: 1. A sonar device comprising an adaptive signal processor that cancels vibration noise detected by the sensor and removes a component of the vibration noise.