CN210986102U

CN210986102U - Underwater close-range magnetic induction communication device

Info

Publication number: CN210986102U
Application number: CN201921044583.2U
Authority: CN
Inventors: 李宏伟; 李志伟; 胥震宇
Original assignee: Shanghai University of Engineering Science
Current assignee: Shanghai University of Engineering Science
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-07-10
Anticipated expiration: 2029-07-05

Abstract

The utility model relates to an underwater short-distance magnetic induction communication device, which comprises a transmitting end shell and a receiving end shell, wherein the transmitting end shell is internally provided with a filter module, an FSK modulation module, a power amplification module and a transmitting coil which are connected with each other, the receiving end shell is internally provided with the filter module, the power amplification module, the FSK demodulation module, a control processing module and a receiving coil which are connected with each other and are the same as the transmitting end shell, the transmitting end shell and the receiving end shell are mutually connected in an induction communication way through the transmitting coil and the receiving coil, the transmission of information is realized between several meters and dozens of meters, the underwater short-distance communication under severe environment can be realized by utilizing the utility model, and the received signals can be correspondingly processed and analyzed, and the underwater short-distance magnetic induction communication device can be used for tasks such as search and rescue under a plurality of, providing it with the necessary information.

Description

Underwater close-range magnetic induction communication device

Technical Field

The utility model belongs to the technical field of the communication technology and specifically relates to a magnetic induction communication device closely under water is related to.

Background

With the development of oceans in various countries, research on underwater communication technology becomes important. Compared with land communication, communication in the sea has its own characteristics, for example, because sea water has good conductivity, and traditional electromagnetic waves are greatly attenuated in the sea, so that to use electromagnetic waves to carry out long-distance communication in the sea bottom, very low frequency and very high transmission power are needed, and by using low-frequency electromagnetic waves, a large-size antenna is needed to ensure the effectiveness of both the transmitter and the receiver, but the requirement of keeping the size of an underwater sensor small obviously conflicts with the requirement of keeping the size of the underwater sensor small, which is almost impossible in the sea. Still other underwater communication methods, such as underwater acoustic communication, underwater laser communication, etc., all suffer from various problems that are difficult to solve during communication. We should now consider the existence of other possible communication means.

Studies have shown that transmission by electromagnetic induction is feasible in underwater communications. Most devices related to magnetic induction communication are simplified in manufacture and strong in anti-interference capability, can be used in the complex and special environment of the ocean, and are relatively simple in anti-corrosion and anti-explosion treatment of corresponding devices. Magnetic induction communication has great advantages in material requirements and cost.

SUMMERY OF THE UTILITY MODEL

The object of the utility model is to provide an underwater short-distance magnetic induction communication device for overcoming the defects existing in the prior art, an amplifying circuit, a filtering mode, an information source coding mode, an information channel coding mode and a modulation and demodulation device suitable for magnetic induction communication.

The purpose of the utility model can be realized through the following technical scheme:

an underwater close-range magnetic induction communication device comprises a transmitting end shell and a receiving end shell, wherein a filter module, an FSK modulation module, a power amplification module and a transmitting coil which are connected with one another are arranged in the transmitting end shell, the filter module, the power amplification module, the FSK demodulation module, a control processing module and the receiving coil which are connected with one another and are the same as those arranged in the transmitting end shell are arranged in the receiving end shell, and the transmitting end shell and the receiving end shell are in induction communication connection with one another through the transmitting coil and the receiving coil.

Further, the length of each of the transmit coil and the receive coil is at least 16 mm.

Further, the control processing module adopts a single chip microcomputer with the model of MSP430F 149.

Further, the chip model adopted by the FSK modulation module is MC 13256.

Further, the chip model of the FSK demodulation module is XR 2211.

Further, the filter module employs a low pass filter.

Further, the power amplification module is formed by connecting a plurality of amplifiers in series.

Further, each of the amplifiers adopts a chip model of OP 37.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the utility model discloses can realize closely magnetic induction communication under water, can do fine processing to the signal received, obtain the result of ideal, utilize the utility model discloses can overcome the information transmission problem among the adverse circumstances such as under water to a certain extent, provide the method to the communication under the extreme condition.

(2) The utility model discloses the structure is simple and easy, powerful, the cost is lower, can be fine completion signal transmission in the adverse circumstances under water.

(3) The utility model provides a casing adopts aluminium system casing, light in weight easily carries.

Drawings

To further clarify the above and other advantages and features of various embodiments of the present invention, a more particular description of various embodiments of the invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. Also, the relative positions and sizes of the respective portions shown in the drawings are exemplary, and should not be understood as uniquely determining positional or dimensional relationships between the respective portions.

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a channel model diagram of the underwater communication of the present invention;

fig. 3 is a schematic diagram of a partial circuit of the filter module and the power amplifier module according to the present invention;

fig. 4 is a schematic diagram of a partial circuit of the FSK demodulation module according to the present invention;

fig. 5 is a schematic diagram of a local circuit of the control processing module according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment, as shown in fig. 1 be the utility model discloses an overall structure sketch map, including transmitting terminal casing and receiving terminal casing, both casings all adopt aluminium system casing, transmitting terminal casing embeds interconnect's filter module, FSK (Frequency-shifting keying) modulation module, power amplification module and transmitting coil, receiving terminal casing embeds interconnect's the same filter module with transmitting terminal casing embeds, power amplification module, FSK (Frequency-shifting keying) demodulation module, control processing module and receiving coil, through transmitting coil and receiving coil mutual induction communication connection between transmitting terminal casing and the receiving terminal casing.

Fig. 2 shows a channel Model diagram of underwater communication according to the present invention, in which MI Transceiver represents Transceiver, Transmitter Coil represents transmitting Coil, Receiver Coil represents receiving Coil, Transformer Model represents Transformer Model, Primary Coil represents Primary Coil, Secondary Coil represents Secondary Coil, Equivalent Circuit represents Equivalent Circuit, Primary L oop represents Primary loop, Secondary L oop represents Secondary loop, in this embodiment, transmitting Coil and receiving Coil have a close-wound length of 16mm, inductance of inductance Coil is 1.2mH, and impedance is 50 ohms, and both transmitting Circuit and receiving Circuit are parallel resonant circuits.

In order to receive the magnetic induction signal better by the coil, the matching resistance and capacitance of the resonance circuit of the coil need to be calculated to obtain a proper value, and then a proper coil matching circuit is designed, when the matching circuit resonates, the resonance frequency f, the inductance value L and the matching capacitance C satisfy the following formula, and then the value of the matching capacitance C can be obtained by the formula.

The utility model discloses in calculate electric capacity C350 pF.

The low-frequency coil performance is closely related to the Q factor thereof, and generally, the higher the Q value, the higher the output energy of the coil, but the Q value is also related to the passband, and the passband is narrowed as the Q value becomes larger. The Q value of the parallel resonant matching circuit can be calculated from the following equation.

The filtering module and the amplifying module mainly process and process signals, referring to fig. 3, the amplifying circuit adopts multi-stage amplification and is composed of a plurality of amplifiers in series connection, the receiving circuit adopts an amplifying circuit with a low-pass filter and a band-pass filter, the receiving circuit adopts a chip OP37, the principle of the band-pass filter is that the low-pass filter and the high-pass filter are adopted, the upper limit cut-off frequency of the band-pass filter is the upper limit cut-off frequency of the low-pass filter, the lower limit cut-off frequency of the band-pass filter is the lower limit cut-off frequency of the high-pass filter, signals in the band-pass filter can pass through, and signals outside. The parameters are explicitly indicated in the figures.

The modulation module integrates the signal required by people and the current signal in the circuit according to a certain rule; the demodulation module separates the signal we transmit from the current signal. As shown in fig. 4, in this embodiment, the model of the chip used by the FSK modulation module is MC13256, and the model of the chip used by the FSK demodulation module is XR 2211.

Referring to fig. 5, the selected chip is a single chip microcomputer with model number MSP430F149, has a 12-bit digital-to-analog converter, can obtain very high precision, and eliminates the trouble of designing a circuit board by using a special analog-to-digital converter, and also has a large capacity of storage space, the storage aspect comprises up to 60KB F L ASH ROM and 2KB RAM, and the storage space can fully meet the requirements of programs and data.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An underwater short-distance magnetic induction communication device is characterized by comprising a transmitting end shell and a receiving end shell, wherein a filter module, an FSK modulation module, a power amplification module and a transmitting coil which are connected with each other are arranged in the transmitting end shell, the receiving end shell is internally provided with the filter module, the power amplification module, the FSK demodulation module, a control processing module and a receiving coil which are connected with each other and are the same as the filter module, the power amplification module, the FSK demodulation module, the control processing module and the receiving coil which are arranged in the transmitting end shell, the transmitting end shell and the receiving end shell are in induction communication connection with each other through the transmitting coil and the receiving coil, the lengths of the transmitting coil and the receiving coil are at least 16mm, the control processing module adopts a single chip microcomputer with the model of MSP430F149, the chip model of the FSK modulation module is MC13256, the chip model of the FSK demodulation module, the power amplification module is formed by connecting a plurality of amplifiers in series, and the model of a chip adopted by each amplifier is OP 37.