CN214480632U - Double-light-source underwater wireless communication system - Google Patents
Double-light-source underwater wireless communication system Download PDFInfo
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- CN214480632U CN214480632U CN202120696970.5U CN202120696970U CN214480632U CN 214480632 U CN214480632 U CN 214480632U CN 202120696970 U CN202120696970 U CN 202120696970U CN 214480632 U CN214480632 U CN 214480632U
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Abstract
The utility model belongs to the technical field of optical communication equipment, and discloses a double-light-source underwater wireless communication system, which comprises a main control end, a light emitting end and a light receiving end; the main control end is respectively connected with the light emitting end and the light receiving end; the light emitting end comprises an LD emitting unit and an LED emitting unit, wherein the LD emitting unit is used for emitting an LD light beam, and the LED emitting unit is used for emitting an LED light beam; the light receiving end comprises an APD receiving unit and a PMT receiving unit, the APD receiving unit is used for receiving the LD light beam, and the PMT receiving unit is used for receiving the LED light beam; the main control end is used for controlling the switching of the transmitting unit and the switching of the receiving unit. The utility model discloses can realize two light sources wireless communication under water, distance all can communicate, with low costs, use extensively.
Description
Technical Field
The utility model belongs to the technical field of optical communication equipment, more specifically relates to a two light sources wireless communication system under water.
Background
The ocean contains abundant and precious resources, and with the continuous deepening of ocean exploration research, the underwater communication technology rapidly becomes a research hotspot. At present, underwater electromagnetic wave communication and underwater acoustic communication are the most widely applied communication technologies for underwater communication. The electromagnetic wave is seriously attenuated in water, so that the transmission distance is short, the transmission speed is slow due to the multipath effect, the time-varying effect and the like of sound in water, and both the electromagnetic wave and the sound cannot better meet the increasing data communication requirement under water. The underwater optical communication has the advantages of high bandwidth, high speed and the like, and makes up for the defects of underwater electromagnetic wave and underwater acoustic communication in underwater application. At present, the research on a wireless optical communication system is still in a laboratory research stage, and how to realize long-distance and high-speed underwater wireless optical communication and how to enable the wireless communication system to adaptively select a transmitting light source and adjust a communication speed according to a communication distance is a problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides a two light sources wireless communication system under water.
The utility model provides a two light sources wireless communication system under water, include: the system comprises a main control end, a light emitting end and a light receiving end; the main control end is respectively connected with the light emitting end and the light receiving end;
the light emitting end comprises an LD emitting unit and an LED emitting unit, the LD emitting unit is used for emitting LD light beams, and the LED emitting unit is used for emitting LED light beams;
the light receiving end comprises an APD receiving unit and a PMT receiving unit, the APD receiving unit is used for receiving the LD light beam, and the PMT receiving unit is used for receiving the LED light beam;
the main control end is used for controlling the switching of the transmitting unit and the switching of the receiving unit.
Preferably, the main control end comprises a terminal and an FPGA control unit, and the terminal is connected with the FPGA control unit;
the LD transmitting unit comprises an LD light source and an LD driving module, and the LD light source is connected with the LD driving module; the LED emitting unit comprises an LED light source and an LED driving module, and the LED light source is connected with the LED driving module;
the APD receiving unit comprises an APD photoelectric detector and an APD subsequent processing module, and the APD photoelectric detector is connected with the APD subsequent processing module; the PMT receiving unit comprises a PMT photoelectric detector and a PMT subsequent processing module, and the PMT photoelectric detector is connected with the PMT subsequent processing module;
the LD driving module, the LED driving module, the APD subsequent processing module and the PMT subsequent processing module are respectively connected with the FPGA control unit.
Preferably, the light emitting end further comprises a first optical system unit including a first focusing lens for focusing the emitted light beam;
the light receiving end further comprises a second optical system unit, the second optical system unit comprises a second condenser lens and an optical filter, the second condenser lens is used for focusing the received light beams, and the optical filter is used for filtering the self-emitted light source of the system.
Preferably, the LD light source, the LED light source and the optical filter are mounted on a lamp panel.
Preferably, the LED light source comprises an LED array consisting of a plurality of LEDs; the LED light source and the LED array are fixedly connected to the annular area of the lamp panel in an annular shape, and the optical filter is fixedly connected to the central vacant position of the lamp panel; the APD photoelectric detector and the PMT photoelectric detector are fixedly connected to the position right behind the optical filter where the received light beams are focused.
Preferably, the FPGA control unit includes an ethernet module and a data processing module; the Ethernet module is used for communicating with the terminal, and the data processing module is used for processing the transmission data.
Preferably, the FPGA control unit further includes a communication mode adaptation module, and the communication mode adaptation module is connected to the data processing module;
the light receiving end also comprises a power monitoring unit which is respectively connected with the APD receiving unit, the PMT receiving unit and the communication mode self-adaptive module; the power monitoring unit is used for monitoring the power of the receiving unit, and the communication mode self-adapting module is used for selecting an LD communication mode or an LED communication mode according to the power of the receiving unit.
Preferably, the FPGA control unit further includes a receiving rate adaptation module, and the receiving rate adaptation module is respectively connected to the data processing module, the APD receiving unit, and the PMT receiving unit; the receiving rate adaptation module is used for adjusting the data transmission rate.
Preferably, the terminal adopts a PC, and the terminal is used for transmitting data and receiving display data.
Preferably, the LD light source includes a first LD light source and a second LD light source, and the LD driving module includes a first LD driving module and a second LD driving module; the first LD light source is connected with the first LD driving module, and the second LD light source is connected with the second LD driving module;
the LED light source comprises a first LED light source and a second LED light source, and the LED driving module comprises a first LED driving module and a second LED driving module; the first LED light source is connected with the first LED driving module, and the second LED light source is connected with the second LED driving module;
the first LD light source has a first wavelength, and the second LD light source has a second wavelength; the first LED light source has the first wavelength and the second LED light source has the second wavelength.
The utility model discloses in the one or more technical scheme that provides, following technological effect or advantage have at least:
in the utility model, the light emitting end comprises an LD emitting unit for emitting an LD light beam and an LED emitting unit for emitting an LED light beam, i.e. a system design scheme of double emitting light sources is provided; and an APD receiving unit is used for receiving the LD light beam at a light receiving end, and a PMT receiving unit is used for receiving the LED light beam, namely a double-receiving detector is used for receiving a light signal. The high-power LED can selectively receive optical signals by PMT and is used for underwater long-distance low-speed communication; the low-power LD can select APD to receive optical signals and is used for underwater short-distance high-speed communication. The information processing part of the system is completed by the main control end, and a user can freely switch the communication mode through the main control end according to the requirement of the communication distance.
Drawings
Fig. 1 is a schematic diagram of a frame of a dual-light-source underwater wireless communication system according to an embodiment of the present invention;
fig. 2 is the embodiment of the utility model provides a plane structure chart of lamp plate among two light sources wireless communication system under water.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The embodiment provides a dual-light source underwater wireless communication system, comprising: the system comprises a main control end, a light emitting end and a light receiving end; the main control end is respectively connected with the light emitting end and the light receiving end. The light emitting end comprises an LD emitting unit and an LED emitting unit, the LD emitting unit is used for emitting LD light beams, and the LED emitting unit is used for emitting LED light beams; the light receiving end comprises an APD receiving unit and a PMT receiving unit, the APD receiving unit is used for receiving the LD light beam, and the PMT receiving unit is used for receiving the LED light beam; the main control end is used for controlling the switching of the transmitting unit and the switching of the receiving unit.
The main control end comprises a terminal and an FPGA control unit, and the terminal is connected with the FPGA control unit. The LD transmitting unit comprises an LD light source and an LD driving module, and the LD light source is connected with the LD driving module; the LED emitting unit comprises an LED light source and an LED driving module, and the LED light source is connected with the LED driving module. The APD receiving unit comprises an APD photoelectric detector and an APD subsequent processing module, and the APD photoelectric detector is connected with the APD subsequent processing module; the PMT receiving unit comprises a PMT photoelectric detector and a PMT subsequent processing module, and the PMT photoelectric detector is connected with the PMT subsequent processing module. The LD driving module, the LED driving module, the APD subsequent processing module and the PMT subsequent processing module are respectively connected with the FPGA control unit.
Further, the light emitting end may further include a first optical system unit including a first focusing lens for focusing the emitted light beam. The light receiving end can also comprise a second optical system unit, the second optical system unit comprises a second condenser lens and an optical filter, the second condenser lens is used for focusing the received light beams, and the optical filter is used for filtering the self-emitted light source of the system.
The LD light source, the LED light source and the optical filter are installed on the lamp panel. For example, the LED light source includes an LED array of a plurality of LEDs; the LED light source and the LED array are fixedly connected to the annular area of the lamp panel in an annular shape, and the optical filter is fixedly connected to the central vacant position of the lamp panel; the APD photoelectric detector and the PMT photoelectric detector are fixedly connected to the position right behind the optical filter where the received light beams are focused.
The FPGA control unit comprises an Ethernet module and a data processing module; the Ethernet module is used for communicating with the terminal, and the data processing module is used for processing the transmission data.
In addition, the FPGA control unit can also comprise a communication mode self-adapting module and a receiving rate self-adapting module. The communication mode self-adapting module is connected with the data processing module. The receiving rate self-adapting module is respectively connected with the data processing module, the APD receiving unit and the PMT receiving unit; the receiving rate adaptation module is used for adjusting the data transmission rate. The light receiving end can also comprise a power monitoring unit which is respectively connected with the APD receiving unit, the PMT receiving unit and the communication mode self-adapting module; the power monitoring unit is used for monitoring the power of the receiving unit, and the communication mode self-adapting module is used for selecting an LD communication mode or an LED communication mode according to the power of the receiving unit.
Specifically, the terminal adopts a PC, and the terminal is used for transmitting data and receiving display data.
In an optimized scheme, the LD light source comprises a first LD light source and a second LD light source, and the LD driving module comprises a first LD driving module and a second LD driving module; the first LD light source is connected with the first LD driving module, and the second LD light source is connected with the second LD driving module. The LED light source comprises a first LED light source and a second LED light source, and the LED driving module comprises a first LED driving module and a second LED driving module; the first LED light source is connected with the first LED driving module, and the second LED light source is connected with the second LED driving module. The first LD light source has a first wavelength, and the second LD light source has a second wavelength; the first LED light source has the first wavelength and the second LED light source has the second wavelength.
Utilize above-mentioned optimization scheme to realize two-way communication, including two the utility model provides a two light source wireless communication systems under water is marked as first equipment and second equipment respectively. The light beam emitted by the light emitting end of the first device has the first wavelength, and the optical filter installed on the first device corresponds to the first wavelength; and the light beam emitted by the light emitting end of the second device has the second wavelength, and the optical filter installed on the second device corresponds to the second wavelength.
The present invention will be further explained below.
As shown in fig. 1, the utility model provides a pair of light source wireless communication system under water includes: the system comprises a main control end, a light emitting end and a light receiving end.
(1) And a main control end.
The main control terminal comprises a terminal and an FPGA (Field Programmable Gate Array) control unit, the terminal is connected with the FPGA control unit, and the terminal adopts a PC (personal computer) and is used for sending multimedia data (such as communication instruction information) and receiving and displaying the multimedia data. The FPGA control unit comprises an Ethernet module and a data processing module, wherein the Ethernet is used for communicating with the terminal, and the data processing module is used for processing transmission data. The FPGA control unit can also comprise a receiving rate self-adapting module, and the receiving rate self-adapting module is used for automatically adjusting the data transmission rate according to a preset rate gear until the frame synchronization of the communication link is completed. The FPGA control unit can also comprise a communication mode self-adapting module which is used for selecting an LD communication mode or an LED communication mode according to the power of the receiving unit.
For example, the FPGA control unit adopts a high-performance FPGA development board of an Alter AC6102 model, the development board has a 30K logic unit, a 74KB on-chip high-speed RAM, 329I/O interfaces, a GMII interface, and other resources, and has a gigabit ethernet transmission function, which can satisfy a communication function between the FPGA control unit of the ethernet module and the terminal, a large number of logic units, which can satisfy a real-time data processing function of the data processing module, and a powerful I/O expansion interface, which can satisfy the rate adaptation function realized by the receiving rate adaptation module. The communication mode self-adaptive module comprises ADC conversion, an ADC08D1500 chip is adopted, the chip is a high-performance analog-to-digital conversion chip, the typical power consumption is 1.9W, the return value of the power monitoring unit is compared with a standard value (the set power range corresponds to the corresponding rate), the communication mode is selected, and then the selected result is input to the data processing module.
(2) A light emitting end.
The Light Emitting end includes an LD (Laser Diode) Emitting unit, an LED (Light Emitting Diode) Emitting unit, and a first optical system unit. The LD transmitting unit comprises an LD light source and an LD driving module for transmitting LD light beams. The LED emitting unit comprises an LED light source and an LED driving module and is used for emitting LED light beams. The first optical system unit is used for focusing the emission light beam.
For example, the two devices of the LD light source system respectively adopt an 80mw450nm laser diode and an 80nw520nm laser diode, and the LD driving modules respectively adopt laser driving chips with models of Max3646 and Max 3967A. The LED light source selects 1W 450nm blue light and 1W 520nm green light, and the LED driving module adopts a Bias of Bias-T plus a constant current source. The first optical system unit includes a first focusing lens.
In addition, this system still includes the lamp plate, the lamp plate is hollow ring form, the light emission end the LD light source, the LED light source with the light receiving terminal the light filter is installed on the lamp plate. For example, the LD light source includes 1 LD, the LED light source includes 11 LEDs, and the 1 LD and the 11 LEDs are annularly and fixedly connected to the lamp panel, as shown in fig. 2.
For example, when bidirectional communication is implemented, one end device adopts 11 blue LEDs and 80mw450nm laser diodes, which are annularly and fixedly connected to the lamp panel, and the other end device, which communicates with the other end device, adopts 11 green LEDs and 80mw520nm laser diodes, which are annularly and fixedly connected to the lamp panel. The power of 11 LED arrays is about 33W, the driving voltage is about 40V, the current is about 1A, the power of blue LD is about 80mw, the driving voltage is 5.4V, the current is about 60mA, the power of green LD is 80mw, the driving voltage is 6.2V, and the current is about 240 mA.
(3) A light receiving end.
The light receiving end includes an APD (avalanche photodiode) receiving unit, a PMT (Photomultiplier Tube) receiving unit, and a second optical system unit. The APD receiving unit comprises an APD photoelectric detector and an APD subsequent processing module and is used for receiving the LD light beam. The PMT receiving unit comprises a PMT photoelectric detector and a PMT subsequent processing module and is used for receiving the LED light beam. The second optical system unit comprises a second condenser lens and an optical filter, the second condenser lens is used for focusing the received light beams, and the optical filter is used for filtering the light source of the device, so that the interference on the received light beams is reduced. The optical filter is fixedly connected to the vacant position in the center of the lamp panel, and the APD photoelectric detector and the PMT photoelectric detector are fixedly connected to the light receiving focus position right behind the optical filter. In addition, the optical receiving end may further include a power monitoring unit.
For example, the APD photodetector adopts an avalanche photodiode, the peak sensitivity wavelength is 600nm, the spectral response range is 320-1000 nm, the cut-off frequency is 60MHz, and the photosensitive area is 19.6mm2And the sensitivity is 16A/W, the APD subsequent processing module performs signal processing by adopting a mode of filtering, amplitude limiting and amplification and level conversion, and finally the sensitivity of the APD receiving unit is measured to be-31.3 dbm.
The PMT photoelectric detector adopts a photomultiplier tube, the peak sensitivity wavelength is 450nm, the spectral response range is 300-600 nm, and the photosensitive area is 156.5mm2The sensitivity is 670A/W, the subsequent PMT processing module performs signal processing by adopting a mode of filtering, amplitude limiting and amplification and level conversion, and finally the sensitivity of the PMT receiving unit is measured to be-55.6 dbm.
The power monitoring unit adopts an INA226 power monitoring module, the sensing voltage range is 0-36V, the high precision is realized, 0.1% gain error and 10uV offset are generated to the maximum extent.
In the case of bidirectional communication, if the light emitting end of the present device is a blue light source, a blue filter (installed in front of the light receiving end to filter the own light to remove communication interference) is installed.
The following is the utility model provides a pair of experimental test result and the technological effect that wireless communication system corresponds under water of two light sources explain.
Under the condition that the water quality attenuation is 0.44dbm/m, when the system is in a short distance (the communication distance is 1-20 m), high-speed LD is generally used for communication, and the 5m can reach 60 Mbps; at long distances (communication distance greater than 20m), low-speed LEDs are typically used for communication, and 60m can reach 10 Mbps.
Under the premise of bidirectional communication, the power monitoring unit can monitor the power of the receiving unit, the distance between two devices can be reflected according to the result of the power monitoring, the most suitable communication mode of the current system can be selected according to the communication distance, the communication distance is from near to far (for example, the communication distance of two communicating devices is from 5m to 60m), the LD high-speed communication mode is preferentially adopted, the communication distance is from far to near, and the LED long-distance communication mode is preferentially adopted.
Under the condition that the communication mode (transmitting light source) is not changed, the transmitting end can adjust the transmitting rate according to the monitored power change, namely, the change value, and the light receiving end can also adjust synchronously and adaptively, so that the normal communication of the system is ensured.
The FPGA control unit is used for receiving transmission data of the terminal and returning the data to the terminal, after receiving the data from the terminal, the FPGA control unit carries out module processing such as buffering, frame header insertion, RS coding, 8B/10B coding, parallel-serial conversion and the like on the data and then transmits the data to the light emitting end in an LVTTL level mode, the light emitting end comprises an LD emitting unit and an LED emitting unit, the FPGA control unit can also select a communication mode of the system by receiving a command of the terminal, if the data is input into the LD emitting unit, the data is loaded into an LD through an LD driving module to emit light beams, and if the data is input into the LED emitting unit, the data is loaded into the LED through an LED driving module to emit light beams. The optical receiving end receives light beam signals, the optical receiving end comprises an APD receiving unit and a PMT receiving unit, the main control end selectively receives signals of the APD receiving processing module or the PMT receiving processing module through the receiving rate self-adapting module in the FPGA control unit, the APD receives an LD light beam with a small divergence angle, the PMT receives an LED light beam with a large divergence angle, a subsequent processing circuit performs filtering, amplitude limiting amplification, level conversion and other operations and then inputs the signals into the data processing module in the FPGA control unit in an LVTTL level mode, and the data processing module performs bit synchronization, frame synchronization, serial-parallel conversion, 8B/10B decoding and RS decoding and then sends the signals to the terminal for display. In addition, if the sending rate of the optical sending end changes, the optical receiving end can adapt to the communication rate within a certain range.
The utility model provides a pair of two light sources wireless communication system under water considers the in-service use demand, and is with low costs, and convenient to use is convenient. The system is suitable for communication operation at the sea bottom and even deep sea, can communicate at a distance and near according to requirements, can also be adjusted in a systematic and self-adaptive manner, saves high cost for laying cables in seawater, and improves the use safety. The light has certain advantages in the modulation frequency of the sea floor, resulting in a wider range of applications for the system.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (10)
1. A dual-light source underwater wireless communication system, comprising: the system comprises a main control end, a light emitting end and a light receiving end; the main control end is respectively connected with the light emitting end and the light receiving end;
the light emitting end comprises an LD emitting unit and an LED emitting unit, the LD emitting unit is used for emitting LD light beams, and the LED emitting unit is used for emitting LED light beams;
the light receiving end comprises an APD receiving unit and a PMT receiving unit, the APD receiving unit is used for receiving the LD light beam, and the PMT receiving unit is used for receiving the LED light beam;
the main control end is used for controlling the switching of the transmitting unit and the switching of the receiving unit.
2. The underwater wireless communication system with double light sources as claimed in claim 1, wherein the main control terminal comprises a terminal and an FPGA control unit, and the terminal is connected with the FPGA control unit;
the LD transmitting unit comprises an LD light source and an LD driving module, and the LD light source is connected with the LD driving module; the LED emitting unit comprises an LED light source and an LED driving module, and the LED light source is connected with the LED driving module;
the APD receiving unit comprises an APD photoelectric detector and an APD subsequent processing module, and the APD photoelectric detector is connected with the APD subsequent processing module; the PMT receiving unit comprises a PMT photoelectric detector and a PMT subsequent processing module, and the PMT photoelectric detector is connected with the PMT subsequent processing module;
the LD driving module, the LED driving module, the APD subsequent processing module and the PMT subsequent processing module are respectively connected with the FPGA control unit.
3. A dual light source underwater wireless communication system as claimed in claim 2, wherein the light emitting end further comprises a first optical system unit including a first focusing lens for focusing the emitted light beam;
the light receiving end further comprises a second optical system unit, the second optical system unit comprises a second condenser lens and an optical filter, the second condenser lens is used for focusing the received light beams, and the optical filter is used for filtering the self-emitted light source of the system.
4. A dual source underwater wireless communication system as claimed in claim 3, wherein the LD light source, the LED light source and the optical filter are mounted on a lamp panel.
5. A dual source underwater wireless communication system as claimed in claim 4 wherein the LED light source comprises an LED array of a plurality of LEDs; the LED light source and the LED array are fixedly connected to the annular area of the lamp panel in an annular shape, and the optical filter is fixedly connected to the central vacant position of the lamp panel; the APD photoelectric detector and the PMT photoelectric detector are fixedly connected to the position right behind the optical filter where the received light beams are focused.
6. A dual light source underwater wireless communication system as claimed in claim 2, wherein the FPGA control unit comprises an ethernet module, a data processing module; the Ethernet module is used for communicating with the terminal, and the data processing module is used for processing the transmission data.
7. The dual-light-source underwater wireless communication system as claimed in claim 6, wherein the FPGA control unit further comprises a communication mode adaptive module, and the communication mode adaptive module is connected with the data processing module;
the light receiving end also comprises a power monitoring unit which is respectively connected with the APD receiving unit, the PMT receiving unit and the communication mode self-adaptive module; the power monitoring unit is used for monitoring the power of the receiving unit, and the communication mode self-adapting module is used for selecting an LD communication mode or an LED communication mode according to the power of the receiving unit.
8. The dual light source underwater wireless communication system as claimed in claim 6, wherein the FPGA control unit further comprises a receiving rate adaptation module, and the receiving rate adaptation module is respectively connected with the data processing module, the APD receiving unit and the PMT receiving unit; the receiving rate adaptation module is used for adjusting the data transmission rate.
9. A dual source underwater wireless communication system as claimed in claim 2 wherein the terminal is a PC and the terminal is adapted to transmit data and receive display data.
10. The dual light source underwater wireless communication system of claim 2, wherein the LD light source includes a first LD light source and a second LD light source, and the LD driving module includes a first LD driving module and a second LD driving module; the first LD light source is connected with the first LD driving module, and the second LD light source is connected with the second LD driving module;
the LED light source comprises a first LED light source and a second LED light source, and the LED driving module comprises a first LED driving module and a second LED driving module; the first LED light source is connected with the first LED driving module, and the second LED light source is connected with the second LED driving module;
the first LD light source has a first wavelength, and the second LD light source has a second wavelength; the first LED light source has the first wavelength and the second LED light source has the second wavelength.
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