JPH0240191B2 - SOONAASOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a sonar device that receives sound waves emitted into water.

(Prior Art) Conventionally, the receiving circuit of this type of sonar device, for example, the receiving circuit of a submarine, etc., has a constant reception gain when receiving sound waves transmitted from an onboard device, so as the depth of the submarine increases, It was not possible to increase the gain of the receiving circuit when the distance from the onboard equipment became large. Further, even if the receiving gain of the receiving circuit could be varied, it was necessary to set the receiving gain according to the depth range in which an unmanned submarine or the like is used. Furthermore, if the depth of an unmanned submersible is constantly changing, it would be difficult to set it manually, so the optimal reception gain was set at the maximum depth that the unmanned submersible would use. Therefore, when the distance between the onboard equipment and an unmanned submersible vessel becomes short, the gain of the receiving circuit becomes too large, causing the output signal of the receiving circuit to become saturated and causing the user to lose track of the true received signal information.

(Object of the Invention) An object of the present invention is to provide a sonar device that automatically increases or decreases the degree of amplification in response to increases or decreases in water pressure applied to a wave receiver.

(Structure of the Invention) A sonar device according to the present invention includes a water pressure detector that detects water pressure applied to a wave receiver, and a control signal that increases or decreases the amplification degree of an amplifier that amplifies a received electrical signal in accordance with an increase or decrease in the detected water pressure. This configuration includes a circuit that generates.

(Embodiments of the invention) Examples of the invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the invention.
This embodiment consists of a receiver 1, a transducer 2, and a detection circuit 3. The receiver 1 consists of a variable amplification circuit 11 and an amplification circuit 12, and the detection circuit 3 consists of an amplification factor setting circuit 31 and a pressure sensor 32. A received signal received by the transducer 2 is amplified by a variable amplification circuit 11 at a predetermined amplification factor. The amplification factor of this variable amplification circuit 11 is set by the detection circuit 3. The output 301 of the detection circuit 3 is a voltage that is predetermined in the amplification factor setting circuit 31 in accordance with the water pressure information 302 from the pressure sensor 32. The amplification factor setting circuit 31 controls the output voltage 301 according to the water pressure information 302 so that the received signal 112 does not become saturated. The pressure sensor 32 is placed in a position underwater where it receives the same pressure as the transducer 2, and
This is a water pressure sensor that detects the pressure applied to the water. Received signal 112 from variable amplifier circuit 12
is amplified by the amplifier circuit 13 and supplied to the received signal display.

FIG. 2 is a schematic diagram showing an example of use in which the embodiment is mounted on a submersible research vessel. In this usage example, the underwater research vessel 102 uses the sounding body 101 mounted on the vessel 100.
This is a system in which a receiving device 103 receives a sound wave signal from a transponder (transponder, underwater phone, etc.). When the diving depth of the underwater research vessel 102 becomes deeper, the distance between the underwater research vessel 102 and the ship 100 becomes longer, so if the sound level of the sound generating device 101 is always constant, the received signal output level of the receiving device will decrease. . However, in this usage example, the receiving device 10
3 employs the embodiment shown in FIG.
It is possible to prevent a decrease in the received signal output level from 3.

A second usage example is schematically shown in FIG. In this usage example, the responder 104 installed on the sea floor is connected to the ship 100.
This is a system that receives command signals from a sounding body 101. The embodiment shown in FIG. 1 is adopted as the receiving device 1041 of the submarine-installed responder 104, and the reception gain of the transformer transmission station 1041 of the submarine-installed responder 104 increases or decreases depending on the depth of the submarine-installed responder 104, and the output signal is changed. It is possible to prevent the level from dropping.

(Effects of the Invention) As described above, the sonar device of the present invention can obtain an appropriate received signal output level because the sonar device automatically increases or decreases the reception gain in accordance with the increase or decrease in the water pressure applied to the receiver.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are schematic diagrams showing examples of use of the embodiment. 1... Receiver, 2... Transmitter/receiver, 3... Detection circuit, 11... Variable amplifier circuit, 12... Power amplifier circuit, 31 Amplification factor setting circuit, 32... Pressure sensor.

Claims (1)

[Claims] 1 A water pressure detector that detects water pressure applied to a wave receiver, and a circuit that generates a control signal that increases or decreases the amplification degree of an amplifier that amplifies a received electrical signal in accordance with an increase or decrease in the detected water pressure. sonar equipment.