JPS6070379A - Sonar apparatus - Google Patents

Abstract

PURPOSE:To reduce the variation in the receiving level of a sound by enabling the generation of a proper sound level, by automatically increasing and decreasing transmission output corresponding to the increase and decrease of water pressure applied to a cable transmitter. CONSTITUTION:The pulse modulation wave 111 from a generator circuit 11 is supplied to an amplifier circuit 12 and amplified at an amplification ratio set by a detector circuit 3 to form a pulse modulation wave 112 which is, in turn, converted to transmission output 113 through a power amplifier circuit 13 and a transmitter 1 while said output 113 is emitted into water as a sonic wave from a transmitter receiver 2. A pressure sensor 32 is placed in water at a position receiving the same pressure as the transmitter receiver 2 to sense the pressure applied to the transmitter receiver 2. The value predetermined in a setting circuit 31 is imparted to an amplifier circuit 12 as the output 301 of the detector circuit 3 corresponding to the water pressure information from the sensor 32. The setting circuit 31 controls the output voltage 301 to a value coming to max. voltage, such that transmission output 113 generates no cavitation in the transmitter receiver 2, corresponding to the water pressure information 302.

Description

[Detailed description of the invention] The present invention emits sound waves into water and detects the object by receiving a reflected signal from an object, or amplifies the received sound waves and radiates them into the water, or uses predetermined information. This invention relates to a nonar device that emits modulated sound waves into water.

Conventionally, the transmitting acoustic power of this type of sonar device is to emit sound waves into the water at a fixed transmitting power to an allowable acoustic power limit in order to increase the detection or receiving distance. The permissible acoustic power limit is just before cavitation occurs. However, the acoustic power per unit surface at which cavitation occurs increases as the water pressure applied to the transmitter increases. Therefore, if the transmission output is fixed, it is not possible to transmit at the maximum acoustic power (acoustic power permissible limit) at that water pressure, but only at the acoustic power permissible limit at the lowest predicted water pressure. Furthermore, even if it were possible to change the transmission output, it was necessary to manually set the transmission output each time the water pressure applied to the transducer changed.

In addition, if the transmitter used tr':J-u' constantly fluctuates (for example, in a submarine's transducer), it is difficult to manually set the transmission output, so the minimum value used by the transducer is The transmission output was set so that cavitation would not occur even at the water pressure at depth. Therefore, there was a drawback that it was not possible to increase the detection distance or extend the communication distance even if the transmitter was located deep.

An object of the present invention is to provide a soaker device that automatically increases and decreases transmission output in accordance with increases and decreases in water pressure applied to a wave transmitter.

The soaker device according to the present invention includes a transmitter that generates an electric signal whose frequency is in the sonic or ultrasonic band and controls the power of the electric signal according to a power control signal, and a transmitter that converts the electric signal into the sonic or ultrasonic wave. a water pressure detector that detects the water pressure received by the wave transmitter; and a circuit that generates the power control signal to increase or decrease the power in accordance with an increase or decrease in the water pressure. This is a prepared depiction.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention, and FIG. 2 shows waveforms of signals of various parts thereof. The embodiment includes a transmitter 1, a transducer 2, and a detection circuit 3. The transmitter 1 includes a pulse generation circuit 11, a variable amplifier circuit 12, and a power amplifier circuit 13, and the detection circuit 3 includes an amplification factor setting circuit 31 and a pressure sensor 32.

The pulse generation circuit 11 generates a pulse modulated wave 111 having a predetermined frequency and a predetermined pulse width at regular intervals. A pulse modulated wave 111 generated by the pulse generation circuit 11 is amplified by a variable amplification circuit 12 at a predetermined amplification factor. The amplification factor of this variable amplifier circuit 12 is set by the detection circuit 3. The output 301 of the detection circuit 3 is water pressure information 3 from the pressure sensor 32.
This voltage is predetermined in the amplification factor setting circuit 31 corresponding to 02. The amplification factor setting circuit 31 adjusts the output voltage 301 according to the water pressure information 302 to a value at which the transmission output 113 becomes the maximum voltage that does not cause cabin chaos in the transducer 2.
:Ii control. The pressure sensor 32 is a Bourdon tube placed in a position underwater where it receives the same pressure as the transducer 2 and senses the If force applied to the transducer 2. The pulse modulated wave 112 from the variable amplifier circuit 12 is power amplified by the power amplifier circuit 13, sent to the transducer 2 as a transmission output 113 from the transmitter 1, and radiated into the water as a sound wave by the transducer 2. .

Ru.

Next, as a second embodiment of the present invention, a method shown in a block diagram in FIG. 3 will be described. FIG. 4 is a waveform diagram of each part of the signal in this embodiment. FIG. 3 is different from FIG.
Rectangular] (consisting of a pulse generating circuit 14, a switching box, a force amplification width circuit 15, and a variable power supply circuit 162). - Generates a pulse modulated wave 401. Rectangular pulse modulation i generated by the rectangular pulse generation circuit 14
, l, l wave 401 is a switching circuit; 9 width circuit 15
The power is amplified by Amplifier circuit 1 that performs switching operation
5, the amplification factor can be changed by changing the 't'ljfM'tfi pressure 403. Sui.

The power supply voltage 403 of the power amplifier circuit 15 is supplied from the variable power supply circuit 16. The power supply voltage 403 generated by the variable power supply circuit 16 is equal to the output voltage 301 of the amplification factor setting circuit 31.
is the value specified by . Therefore, the variable power supply circuit 16 generates a power supply voltage 403 according to the water pressure information 302, and the switching power amplifier circuit 15 power amplifies the rectangular, It is output from the transmitter 1 as an output 402. Transmission output 402 from the transmitter 1 is sent to the transducer 2 and radiated into the water as a sound wave.

Next, a usage example of the embodiment shown in FIG. 1 or 3 will be described.

Figure 5 is a schematic diagram showing an example of use in which these embodiments are mounted on a submersible research vessel. This usage example is a system in which a receiving device &' 101 receives a sound wave signal from a sounding device 103 (pinker, underwater iIi'i talking device, etc.) mounted on a submersible research vessel 102 of a ship 100. When the diving depth of the submersible research vessel 102 becomes deeper, the distance between the vessel 100 and the submersible research vessel 102 becomes longer.
When the sound level of 03 is always constant, the receiving level of the receiving device 101 decreases. However, in this usage example, the sounding device]03 and the 11th! Since the embodiment shown in FIG. 3 is adopted, it is possible to prevent the reception level of the receiving device 101 from decreasing even if the diving depth of the fresh water research vessel 102 becomes deeper.

A second usage example is schematically shown in FIG. An example of this usage is
; IQ ItQ 100 is a system in which a receiving device 101 receives a received signal from an undersea still image transponder 104 or a dropped pinger 105.

Submarine installed transponder 104 and throw type pinger 1
The embodiment shown in FIG. 1 or FIG. 3 is adopted for 05, and includes a transponder 104 installed on the seabed and a drop-down type binger]. Sound level it of 05 increases or decreases depending on the depth. Therefore, even if the size of the transponder 104 and the pinger 105 is large, the receiver (H equipment fM(, 101
can be received without reducing the reception level.

As explained above, the soaker device of the present invention automatically increases or decreases the transmission output according to the electric power 1 of the water pressure applied to the transmitter, so it is possible to generate an appropriate sound level. Therefore, it is possible to reduce fluctuations in the reception level on the receiving device side that receives the radiated sound.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the first embodiment of the present invention, FIG. 2 is a waveform diagram of each part of the signal, FIG. 3 is a block diagram of the second embodiment of the present invention, and FIG. 4 is a block diagram of the second embodiment of the present invention. FIGS. 5 and 6 are schematic diagrams showing an example of the use of these embodiments. 1.4...Transmitter, 2...Transducer/receiver,
3...Detection circuit, 11...Pulse generation circuit, J2...Variable amplifier circuit, 13...
・Power amplifier circuit, 14... Rectangular pulse generation circuit, 15... Switching power amplifier circuit, 16-
... Variable power supply circuit, 31 ... Amplification factor setting circuit, 32 ... Pressure sensor. Agent Ben 19 Uchihara jlR-'"""i-"'
, 1” 艷, ・, 2) Go-・ N So 1IN

Claims (1)

[Claims] A transmitter that generates an electric signal whose frequency is in the sonic or ultrasonic band and controls the power of the electric signal according to a power control signal, and a transmitter that converts the electric signal into a sonic or ultrasonic wave and radiates it into the water. A sonar device comprising: a water pressure detector that detects water pressure received by a wave transmitter; and a circuit that generates the gravity control signal so as to increase or decrease the reduced electromotive force in accordance with an increase or decrease in the water pressure.