JPH03245625A - Underwater communication equipment - Google Patents

Abstract

PURPOSE:To considerably eliminate noise from an undersired direction and to ensure the remarkable improvement of the confidentiality by providing a beam control means controlling a beam pattern of a wave transmitter-receiver mounted on a mother vessel and an underwater mobile object is directed to each directive direction. CONSTITUTION:In the case of the wave reception system, a sound wave received by a wave receiver group 1 is amplified by an amplifier 2 for each wave receiver and a pre-formed beam 31 is formed by a beam former 3 of a beam controller 10. The peak value of a received signal is detected by a peak level detector 4 in output signals of respective beam patterns (b), (c) in the directions of 0 deg. and a deg. (+ or -a is a deflection angle of a pre-formed beam) to recognize the sound wave incoming direction and outputs a peak value 41. The operation of the series of the wave transmission/ reception group 1 - the peak level detector 4 corresponds to a reception wave horizontal fan beam 1015 and the operation of the series of the wave transmission reception group 5 - a peak level detector 8 corresponds to a reception wave vertical fan beam 1014. An adder 9 adds the reception signals to obtain an output signal 91. The signal is equivalent to a received cross fan beam 1016 and this means that a narrow beam is formed in a direction into which the sound source incoming direction is desired to be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an underwater communication device, and in particular, the present invention relates to an underwater communication device, and in particular, directs transmitting beams and receiving beams of underwater moving objects such as a mother ship and an underwater vessel that perform underwater communication in mutual directional directions. This invention relates to an underwater communication device that performs beam control to optimize beam control.

[Conventional technology]

Underwater communication is carried out using ultrasonic waves between a transducer installed on the bottom of the mother ship and a transducer installed on the side of the underwater vehicle. FIG. 2 is an explanatory diagram showing the basic operation of the underwater communication device. The transmitting beam output from the transmitter of the underwater vehicle 102 in FIG. 2 is received by the receiving beam C of the mother ship 101. In the reverse case, the transmitted beam L output from the transmitter a is received as the received beam d. A transmitter is connected to the wave transmitter, and a receiver is connected to the wave receiver, and necessary amplification is performed to perform underwater communication. Conventional technologies include an underwater intercom 2 image communication device, a transponder binger, and the like.

[Problem to be solved by the invention]

The conventional underwater communication device described above has the following drawbacks. Normally, the relative relationship between the mother ship as a platform 7 and the underwater moving object is such that even if each moves, the beam width of each transducer is within the beam width of the transducer, as shown in Figure 2. is widening. In addition, noise will be input to the 6 receivers through a wide range of beam widths, resulting in deterioration of communication quality.Also, if you want to limit the directivity width and limit the communication range to increase confidentiality, It has the disadvantage of being inappropriate.

[Means to solve the problem]

The underwater communication device of the present invention is an underwater communication device that transmits information between a mother ship and an underwater moving object, and the underwater communication device is such that beam patterns of transducers mounted on the mother ship and the underwater moving object are directed in mutual directions. and a beam control means for controlling the beam.

〔Example〕

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

FIG. 1 is a block diagram showing the configuration of an embodiment of an underwater communication device of the present invention, and FIG. 1 shows a wave receiving system as an example. The sound waves received by the receiver group 1 are amplified by the amplifier 2 for each receiver, and then a preformed beam 31 is formed by the beam former 3 of the beam control device 10. FIG. 5 shows an example of beamformer output. Figure 5 (
FIG. 5(b) is an explanatory diagram of the preformed beam, FIG. 5(b) is an explanatory diagram of the preformed beam in the 0° direction, and FIG. 5(C) is an explanatory diagram of the preformed beam in the critical angle direction. Let the swing angle of the preformed beam be ±a. The 0° direction is shown in Figure 5(b).

The a° direction is shown as an example in FIG. 5(C), and the respective beam patterns are shown as . Among these output signals, the peak level detector 4 shown in FIG. 1 detects the peak value of the received signal 8 to recognize the direction of arrival of the sound wave, and outputs the peak value 41.

FIG. 4 is an explanatory diagram of cross fan beam formation, and the operation of the transducer group 1 to peak level detector 4 shown in FIG.
Equivalent to 5. On the other hand, the operation of the series of transducer group 5 to peak level detector 8 in FIG. 1 is equivalent to the delivery vertical fan beam 1014 shown in FIG. The adder 9 in FIG. 1 adds these received signals to obtain an output signal 91. This is equivalent to the received cross fan beam 1016 shown in FIG. 4, and a narrow beam is formed in the desired direction of arrival of the sound source. Although FIG. 1 shows an example of only the receiving system, the transmitting system can be formed in exactly the same manner. - In order to form a cross fan beam for boat fishing, the transducer often needs to be large, so
It is often applied mainly to the wave receiving section on the mother ship 101 side.

FIG. 3 is an explanatory diagram of the basic operation of the narrow beam according to the embodiment of FIG. 1.

The mother ship 101 and the underwater vehicle 102 transmit and receive signals via the receiving beam 1019 and the transmitting/receiving beam 1020 using narrow beams formed by cross fan beams, and these transmitting/receiving beams can be formed in desired directions as described above. Therefore, underwater communication with significantly suppressed noise reception is possible.

〔Effect of the invention〕

As explained above, according to the present invention, in an underwater communication device that uses ultrasonic waves between a transducer installed on the bottom of a mother ship and a transducer installed on an underwater moving object, a cross fan beam is controlled by a beam control device. By optimally controlling the transmitting and receiving beams so as to direct them to the target direction, it is possible to significantly eliminate noise from undesired directions and to ensure a significant improvement in secrecy.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the basic operation of an underwater communication device, and FIG.
Figure 4 is an explanatory diagram of the basic operation of the narrow beam according to the embodiment of Figure 1, Figure 4 is an explanatory diagram of the narrow beam using the cross fan beam, Figure 5(a) is an explanatory diagram of the preformed beam, Figure (b) is an explanatory diagram of the preformed beam in the 0'' direction, and Figure 5 (C) is an explanatory diagram of the preformed beam in the critical angle direction. 1...Receiver group, 2...Amplifier, 3.
・Group Beamformer-14...Peak level detector, 5...Receiver group, 6...Amplifier, 7.Old...Beamformer-18... ...Peak level detector, 9. Old... Adder.

Claims (1)

[Claims] An underwater communication device for transmitting information between a mother ship and an underwater moving object, comprising beam control means for controlling beam patterns of transducers mounted on the mother ship and the underwater moving object so as to point in mutual directions. An underwater communication device characterized by: