JPS5934178A - Artificial target device for sonar - Google Patents

Abstract

PURPOSE:To generate no howling even if target strength is large, by delaying a receiving signal by a pulse width corresponding portion of said signal, amplifying it to target strength, and transmitting it as a transmitting signal into the water from a transducer. CONSTITUTION:A receiving acoustic signal A of normal pulse width, which is transmitted is received by a receiver 15 and is converted to an electric signal C. The signal C is amplified by an amplifier 23, its noise is eliminated by a band pass filter 24, it is detected by a detector 25, and as for its output D, its level is detected by a pulse level detector 26. This detected level is extended by a pulse width corresponding portion by a pulse level delaying circuit 27 and is outputted. The signal D is inputted to a level comparing circuit 30 through a pulse width delaying circuit 28, pulse shaping circuit 29. An output of a gate circuit 33 is amplified in order to become desired target strength by a power amplifier 35 through a level variable device 34.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pseudo target device for sonar that is configured so that nozzling does not occur even when the target strength is large.

When performing sonar detection training or evaluating the performance of sonar equipment, a four-way target device is required as an acoustic target, but with conventional targets, the target strength (sound wave reverberation strength) is fixed. Or, if it is variable, there is a problem that known ringing occurs.

That is, a very simple pseudo target placed in water is a trigrane. This is a reflection plate type in which plates intersect, and the target strength is uniquely determined by its shape. By the way, when conducting sonar detection training or evaluating the performance of sonar equipment, it is desirable that the target strength be variable, but what about the target strength that can be variably controlled? An example of this is under. This amplifies the acoustic signal received by the receiver and sends it back into the water from the transmitter, which is a transducer different from the receiver. Problems are starting to arise. This is because when the target strength is about +10 dB, howling occurs between the transmitted and received signals, making it impossible to use υ. For this reason, as disclosed in Japanese Patent Publication No. 42-7508, by inserting a complete phase shift circuit in the receiving signal route and using it as a leakage acoustic feedback from transmitting to receiving, the C1 howling limit can be overcome. It is also known that the target strength has been improved to +40 dB. However, even with such a responder, there is still a howling limit, and the amount of phase shift increases each time the frequency is changed.
The reality is that it has to be reset, which is inconvenient in practice.

In addition, batteries are generally used as the operating power source for responders, but conventional responders are designed to be in constant operation (I-). Replace the oil] - It's a shame.Furthermore, even though the length can be set variable, the setting is done manually and cannot be easily set remotely. but),
Ru.

Therefore, the purpose of the present invention is to create a sonar pseudo-target device V that can easily handle and obtain 2 changes in frequency without causing howling even when the target strength is set to a large value. Another object of the present invention is to remotely control power on/off control and target/understand settings. 91;

For this purpose, the present invention delays the received signal by an amount equivalent to the pulse width of this signal [7], amplifies it to a preset target strength, and then transmits the received signal to the receiving system by a time equivalent to the pulse width of the signal. In addition, the present invention C adds a wireless receiver to the configuration thus constructed, and the wireless receiver receives the signal. The power on/off control and target strength settings can all be controlled by remote control commands.

The present invention will now be explained with reference to FIGS. 1 to 3.

First, the manner of use of the device according to the present invention will be explained using v, 1 equivalence 11blVC. Place the dummy target device body 5 at the required water depth below the sea level as shown in Fig. In this example, a σ wireless amplifier 6 is attached to the buoy 3, and a wireless receiver is also housed inside the buoy 3, since remote control is possible. This radio mail: (, ff' 4i!! uses a dedicated battery as the operating power source and can always receive all control command radio waves from the wireless transmission system, etc. In this case, the operating power source for the device main body 5 is turned on or off, or the target strength is set to the desired setting. If the target strength is set to a desired value and the acoustic signal is received by the pseudo target device main body 5, j(1,f pseudo target device main body 5 receives the acoustic signal as a response). Later, a transducer for transmitting and receiving all the acoustic signals of the desired target strength is used to transmit underwater. In Fig. J fbl, a weight is attached to the dummy target device main body 5 through an IB lower string 7. 8 and the weight 8 is placed on the bottom of the seabed 2 to prevent the pseudo target device main body 5 from being washed away by ocean currents.
This is similar to that shown in at-t'.

Now, the present invention will be explained in detail with reference to FIGS. 2 and 3. FIG. 2 shows the electrical configuration of the device according to the invention, and
FIG. 3 qualitatively shows all the input/output signal waveforms in the main part.

According to this, a received acoustic signal A having a specified width of 0.00000000 s transmitted from the transmitting side is received by the receiver 15 and converted into an electrical received signal C. It looks like this. Since this received signal C is usually several mV in magnitude, the windings 16a, 16 constituting a matching transformer (autotransformer)
Zener diodes connected in anti-parallel between 17.18 and 17.b are inserted and connected between Zener diode 2 with reverse differential column tangent provided on the hexagonal side of the stationary amplifier]
, 22 and the power amplifier 35 are anti-parallel connected Zener diodes 36, 37.38.
, 39 are also in a non-conducting state. Therefore, when the acoustic signal A is received, the received signal C corresponding to the acoustic signal A is
is amplified by the preamplifier through resistor 19.20i with almost no loss. The received signal C amplified by the preamplifier is then subjected to noise removal by a pantone filter U and then detected by a detector O, while its frequency is analyzed by a frequency analyzer 31. There is.

Among these, the level of the detector δ output signal is detected by the pulse level detector 26, and the detected level is further extended by the pulse width A11 for the time being and outputted by the pulse level delay circuit 27.

Further, the output signal of the wave detector 5 is delayed by the pulse width equivalent by the pulse width delay circuit 28, and then the signal is delayed by the pulse width shaping circuit 29.
However, the pulse level comparison circuit 30 delays the output signal of the detector 5 by an amount equivalent to the pulse width based on the outputs from the pulse level delay circuit 27 and the pulse shaping circuit 29. It's out of place to get what you're looking for.

7J, 1 of the bandpass filter 24] The frequency of the force is analyzed by a frequency analyzer 3J, and the L oscillation frequency of the synchronous oscillator 32 is controlled based on the analysis result. The same frequency as that frequency is obtained by the synchronous oscillator 32, but its amplitude level is assumed to be constant. The output of the synchronous oscillator 32 is amplitude-modulated by the dart circuit 33, which has all the modulation functions, as the output modulation signal from the pulse level comparison circuit 30, but this allows the same signal as the output of the 2-channel pulse filter to have a pulse width equivalent to that of the output from the pulse level comparison circuit 30. The circuit on the output side of the bandpass filter U is an analog delay circuit for supplying and depleting a delay amount corresponding to the nogle width. Functions as 40. The output of the gate circuit 33 is sent to the power amplifier 3 via a level variable device 3tl.
In step 5, the target strength is amplified as much as possible, but the target strength is set by the level "J" AZ device 311. Level variable device 34
The desired target strength can be set by controlling the level variable device 34, but the control of the level variable device 34 is done manually.In addition, as will be described later, it can also be done automatically by remote control. It is Noh.

In any case, if the level variable devices 34 are appropriately controlled, the desired target strength can be obtained.

Now, the output of the gravity amplifier 35 is converted into acoustic signal 411 and then transmitted underwater, and five receivers can be used for the transmission. This is because transmission is performed after waiting for the completion of reception, and therefore, the transducer for receiving waves can be used for transmitting waves at the time of transmission. Since the transmission signal J as the output of the power amplifier 35 is usually several tens to several gv, the anti-parallel connected Zener diodes 17, 18, 36, 37, 3
8, 39 are brought into conduction, and the transmission signal J is boosted by the matching transformer and transmitted from the receiver 15 to the transmission acoustic signals B, 11-1. .

can be transmitted underwater. However, what should be noted here is that the transmitting signal must not leak to the receiving side in order to prevent the housing from leaking.

The anti-parallel connected Zener diodes 27 and 22 provided on the input side of the preamplifier B are for this purpose, and operate to short-circuit the amplifier input terminals during transmission. This effectively prevents howling.

In this way, in the present invention, since the received signal is delayed by an amount equivalent to its pulse width as the transmitter C7, the transducer of the receiver can also be used for transmitting waves, and furthermore, the transmission is automatically switched by the Zener diode. Since howling is effectively prevented by the circuit, the target strength range can actually be increased to +60 dB in practice. Although this objective has been achieved to a certain extent, in other aspects of the present invention, the on/off control of the operating power supply and the control of the level variable device can be automatically performed remotely by wireless. .

FIG. 2 also shows a circuit section for carrying out all of the remote control, but it goes without saying that the radio antenna 6 and radio receiver 9 described above are required. When remote control is not performed, the battery as an operating power supply constantly supplies power to all necessary circuit parts,
In the case of remote control, it is supplied only when necessary. More specifically, referring to FIG. 2, a battery (not shown) is provided as a dedicated power source for the radio receiver 9 and the power source 1d control circuit 10, and these are kept in an operating state at all times. l: The sea urchin is turning. However, when a control command is received by the radio receiver 9 in such a state, if the control command is related to a power supply, the power supply control circuit 10 depends on whether the control command is related to a power supply or not. The excitation of the relay coil 11 is controlled through the relay contact 13, and the supply of power is controlled by the relay contact 13. This suppresses battery consumption as much as possible. Depending on the closing of the relay contact 13, power is also supplied to the target strength controller 14, but if a control command regarding the target strength setting is received in such a state, the control command will be executed according to the command. The target strength controller 14 controls the level variable device 34. In the previous invention, the level variable device 34 was manually controlled, and the dummy target device main body 5 had to be pulled out of the sea each time the target strength was changed.
This is not necessary in the present invention.

In addition, target strength Ts is Ts = 2tJ
As expressed as log 10 (B/A), it is necessary to take this into consideration and set up a level diagram for the entire system.

As explained above, in the case of the present invention, the received signal is delayed by its pulse width and the entire transmitted signal is used, and the leakage of the transmitted signal to the receiving system is prevented by the transmitted signal.
Since it is prevented from occurring, it is possible not only to easily cope with changes in frequency by q5%, but also to be able to increase the total node strength to 1-60 dB without causing howling. In addition, according to another aspect of the present invention, since the operating power button and the target strength are controlled remotely and wirelessly, there is no need to withdraw the target strength when changing the target strength.
This has the effect of reducing the number of repatriations associated with ll exchange.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of how the device according to the present invention is used, Figure 2 is a diagram showing the complete configuration of an example of the device according to the present invention at 1°C, and Figure 3 is , is a diagram qualitatively showing the input/output signal waveforms in the main parts. 6...Radio antenna, 9...Radio receiver, 10...
・Power supply control circuit, 12...Battery (operating power supply), 14.
...Target strength controller, ] ... (For both transmitting and receiving) Receiver, 16a, 16b - (For single-turn transformer configuration) Winding, 17, 1.8°21, 22, 36~
39... (for automatic transmission/reception switching) Zener diode, 2
3... Preamplifier, 24... Pantone 4 filter, 3/I... Level variable device, 35... Power amplifier,
40...Analog delay circuit. Representative Patent Attorney Tadashi Akimoto Diagram 1 (a) (b) Individual E Report τi Magazine A Disease Management Issue C 4 Sweat (5D Ha0rus Level 4 etc. Sui 1, 30 ring circuits, 30 swords, G, 33 H, output, 1,000 liters of electric power, 35 ji, N Kai, included! U〉 B Figure 3 1 ■ Hunger 1 --- "-C- □

Claims (1)

[Claims] 1. A matching transformer as a single-turn transformer in which an automatic transmission/reception switching circuit is inserted in series in a common winding part.A receiver is on the high voltage winding side and automatic transmission/reception switching is on the low voltage winding side. ? A preamplifier having a power amplifier and a power amplifier are connected in parallel through an automatic transmission/reception switching circuit, and a received signal corresponding to the acoustic signal received by the receiver is transmitted to the matching transformer and the preamplifier. Furthermore, the signal is extended by the /F pulse width by an analog delay circuit via a Pantonoyas filter, and the signal related to the delay is transmitted as a transmission signal to a level variable device for setting a target strength, the above-mentioned power amplifier, and a matching transformer. A pseudo-target device for a radio receiver, which is configured to be transmitted as a transmitting acoustic signal by being applied to the receiver through the receiver. 2. The automatic transmitting/receiving switching circuit is defined as the first claim in which Zener diodes having the same characteristics are connected in antiparallel.
The dummy target device for the ner as described in . 3. A matching transformer as a single-turn transformer in which an automatic transmission/reception switching circuit is inserted in series in the common winding part.A receiver is on the high-voltage winding side, and a preamplifier with an automatic transmission/reception switching circuit on the low-voltage winding side. , automatic transmission/reception switching circuit? A power amplifier is connected in parallel through the receiver, and the received signal corresponding to the acoustic signal received by the receiver is transmitted through the matching transformer and preamplifier, and further through the band/channel filter. The signal is delayed by the pulse width of the signal by an analog delay circuit, and the signal related to the delay is applied as a transmission signal to the Kugtstrength setting level variable device, the power amplifier, the matching transformer, and the receiver. A receiving line receiver receives all control commands via remote control and radio to control the power supply to each of the circuit parts and control the level variable device for setting the target strength. A 1kI-like target device for sonar, which is characterized by a configuration designed to be carried out by. 4. Claim 3 in which the transmission/reception automatic switching circuit is made up of Zener diodes having the same characteristics connected in antiparallel.
The dummy target device for the ner as described in .