JPH02196987A - Underwater detected distance dummy buoy - Google Patents

Abstract

PURPOSE:To escape from the underwater acoustic tracking of an active sonar without any special motion of a vessel nor any influence upon its structure by providing a signal detection part, a signal delay part, and a signal transmission part. CONSTITUTION:The signal detection part 1 is constituted having a wave receiver 11, an A/D converter 12, a detector 13, and a gate signal generator 14 and converts ultrasonic wave pulses into an electric signal. A signal delay part 2 is constituted having a memory 21, a controller 22, a timer 23, and a D/A converter 24 and an electric signal which is inputted from the detection part 1 is delayed by the time of conversion using a preset pattern. The signal transmission part 3 is constituted having an amplifier 31 and a wave transmitter 32, amplifies and converts an electric signal inputted from the delay part into an underwater ultrasonic wave, and sends it out. Consequently, the vessel can escape from the underwater acoustic tracking without any special motion, there is no influence exerted upon the structure of the vessel, and the cost is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an underwater detection distance deception buoy, and particularly to an underwater detection distance deception buoy used by submarines and surface ships to escape from tracking by active sonar. Regarding.

[Conventional technology]

For example, if a submarine receives underwater acoustic tracking from an underwater vehicle such as an active sonobuoy or an active homing torpedo, it may increase its diving depth and escape to greater depths, or it may increase its diving speed and escape to a greater distance. Alternatively, methods have been used to escape from tracking by ejecting bubbles to reflect the tracking ultrasonic pulses away from the own ship.

[Problem to be solved by the invention]

The various conventional escape methods described above are limited by the underwater pressure resistance of the submarine in order to increase the diving depth, the limit in the capacity of the power battery in order to increase the diving speed, and the limitations of the submarine's own ship's Underwater noise becomes louder, and ejecting bubbles makes the submarine structure more complicated and larger, both of which have drawbacks.

The purpose of the present invention is to enable a ship to escape from underwater acoustic tracking of an active sonar without making any special movements or affecting its structure.
The objective is to provide a new buoy that deceives underwater detection distance.

[Means to solve the problem]

The underwater detectable distance deception buoy of the present invention includes a signal detection section that converts underwater ultrasonic pulses into electrical signals, and a signal delay that delays the electrical signals input from the signal detection section by the time that changes in a preset pattern. and a signal sending section that amplifies the electrical signal input from the signal delay section, converts it into underwater ultrasound, and sends it out.

〔Example〕

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

FIG. 1 is a block diagram showing a signal processing system according to an embodiment of the present invention.

This embodiment includes a signal detection section 1 that converts underwater ultrasonic pulses into electrical signals, a signal delay section 2 that delays the electrical signal input from the signal detection section 1 by the time required to convert it in a preset pattern, It is configured to include a signal sending section 3 that amplifies the electrical signal input from the signal delay section 2, converts it into an underwater ultrasonic wave, and sends it out. The signal detection unit 1 includes a receiver 11
．． A/D converter 12. It is configured with a detector 13 and a gate signal generator 14. The signal delay unit 2 includes a memory 21. Controller 22. It is configured with a timer 23 and a D/A converter 24. The signal sending section 3 includes an amplifier 31 and a wave transmitter 32.

FIG. 2 is an explanatory diagram showing the operational status of the underwater detectable distance deception buoy A, which is an embodiment of the signal processing system shown in FIG. 1. Structurally, the underwater detection range deception buoy A consists of a buoy body AI and a hydrophone A2, which are connected to each other by wires.
It consists of a float A3 and a float A3. The receiver 11 and transmitter 32 in FIG. 1 are incorporated into the hydrophone A2, and the other parts in FIG. 1 are housed within the buoy main body AI.

Referring to FIG. 2, aircraft B drops an active sonobuoy C onto the sea surface for underwater acoustic tracking of a submarine. The dropped active sonobuoy C periodically sends out ultrasonic pulses into the water and receives echo pulses from the VH.
Converts to F radio waves and sends them out. The transmitted VHF radio waves are
It is received by the receiver Bl of the aircraft B, processed by the onboard processing unit B2, and displayed on the A scope (not shown).

A submarine detects that it is being tracked underwater by receiving ultrasonic pulses sent out by active sonobuoy C, and fires a deceptive buoy A into the water. Hydrophone A2 of deceptive buoy A is kept at a predetermined depth by the buoyancy of float A3.

The receiver 11 converts the ultrasonic pulse sent out by the active sonobuoy C into an electrical signal and outputs it to the A/D converter 12 and the detector 3. The A/D converter 12 samples and quantizes the input electrical signal, converts it into a digital signal, and outputs the digital signal to the memory 21 . On the other hand, the detector 13 detects the input electric signal, and the gate signal generator 14 detects the input electric signal.
3 generates a gate signal at the timing when the detection output is input and outputs it to the memory 21 and the timer 23.

The timer 23 starts counting time at the timing when the gate signal is input from the gate signal generator 14, and when a delay time TD has elapsed from the start of this timing, it generates a pulse-like signal. As will be explained later, the delay time TD is controlled by the controller 22.
is a variable value specified by The memory 21 writes the digital signal input from the A/D converter 12 at the timing when the gate signal is input from the gate signal generator 14, and reads the written digital signal at the timing when the signal is input from the timer 23. The read digital signal is reconverted into an analog electrical signal by the D/A converter 24 and output to the amplifier 31.

The amplifier 31 amplifies the input electrical signal, and the amplified electrical signal is converted into an ultrasonic pulse by the wave transmitter 32 and sent into the water. Therefore, the ultrasonic pulse input to the receiver 11 is delayed by the delay time TD, amplified, and retransmitted.

Now, active sonobuoy C transmits an echo pulse P of the structure of buoy A that deceives the submarine's detectable distance under water by transmitting one ultrasonic pulse. , and receive the three deceptive echo pulses P8 transmitted by the transmitter 32. Active sonobuoy C and submarine.

Let the propagation paths of underwater ultrasonic waves to and from buoy A be Ll and L2 (see Figure 2), respectively, and the round trip times of underwater ultrasonic waves on the propagation paths LL and L2 be Tt and Tz, respectively. , the display on the A scope of aircraft B is as illustrated in FIG. However, Ts”
” T 2 + T b. In order to deceive the other party and peak-track the deceptive echo pulse P8,
Echo pulse P1. The amplifier 31 is set so that the amplitude of the Pt Wt4IiI deceptive echo pulse P8 is larger.
Set the gain of Furthermore, the delay time T,) is also changed over time. For example, immediately after underwater detection range deception buoy A is launched from a submarine, the positions of echo pulse P1 and deception echo pulse P8 almost coincide (time T,...
The change pattern of the delay time TD is set so that Tj coincide with each other) and then gradually separate from each other. This change pattern is set in the controller 22 by an external setting signal immediately before launching from the submarine depending on the situation, and
specifies to the timer 23 a delay time TD that changes over time according to the set pattern.

In addition, in order to make the envelope waveform of the deceptive echo pulse P8 similar to the envelope waveform of the echo pulse P1 produced by a submarine and to make it easier for the other party to be deceived, there is a signal in the signal path from the receiver 11 to the amplifier 31. It is also possible to insert a filter that changes the envelope waveform.

An embodiment of the present invention has been described above for use in a submarine.

The underwater detection range deception buoy of the present invention can provide similar effects not only for submarines, but also for surface battleships that are acoustically tracked underwater by active homing underwater vehicles, for example.

〔Effect of the invention〕

As explained above, the present invention converts the underwater ultrasonic pulse sent out by the active sonar into an electrical signal, delays it by a time that changes in a predetermined pattern, reconverts it into an underwater ultrasonic pulse, and sends it out. This has the effect of allowing the ship to escape from underwater acoustic tracking without making any special movements, and also has the effect of being able to be implemented at low cost without affecting the structure of the ship.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a signal processing system according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the operational status of the embodiment, and FIG.
The figure is an explanatory diagram showing an example of the display on the A scope in aircraft B in FIG. 2. l...Signal detection unit, 2...Signal delay unit, 3...Signal sending unit, 11...Receiver, 12...・A/D converter, 13...Detector, 14...Gate signal generator, 21...
...Memory, 22...Controller, 23...
...Timer, 24...D/A converter, 31...
...Amplifier, 32...Transmitter. Agent Patent Attorney Shinsu Uchihara3

Claims (1)

[Claims] a signal detection unit that converts underwater ultrasonic pulses into electrical signals;
A signal delay section that delays the electrical signal input from this signal detection section by a time that changes in a preset pattern, and a signal transmission section that amplifies the electrical signal input from this signal delay section, converts it into underwater ultrasound, and sends it out. An underwater detectable distance deception buoy characterized by comprising: