CN114710206B

CN114710206B - Shore-sea emergency communication method and system based on LED light source

Info

Publication number: CN114710206B
Application number: CN202210283976.9A
Authority: CN
Inventors: 陈萍; 魏思蒙; 刘婷婷; 唐越; 李东
Original assignee: China Shipbuilding Corp System Engineering Research Institute
Current assignee: China Shipbuilding Corp System Engineering Research Institute
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-12-13
Anticipated expiration: 2042-03-21
Also published as: CN114710206A

Abstract

The embodiment of the invention provides a shore emergency communication method and a shore emergency communication system based on an LED light source, wherein the method comprises the steps of receiving first transmission information sent by a shore-based emergency service center or second transmission information sent by a shipborne LED lamp of a marine ship, wherein the first transmission information is at least one of service information, alarm information, safety information or meteorological information, and the second transmission information at least comprises distress alarm and distress signal; extracting, caching and classifying the received first transmission information, if the first transmission information is service information to be forwarded, modulating, coding and up-converting the first transmission information, adjusting the amplification factor of an amplification circuit to enable a modulation signal to reach a required signal amplitude, and loading the modulation signal onto an LED navigation mark lamp and sending the modulation signal; and decoding and demodulating the received second transmission information to obtain related information, and forwarding the related information to a shore-based emergency service center, wherein the second transmission information is sent in a preset mode through a shipborne LED lamp.

Description

Shore-sea emergency communication method and system based on LED light source

Technical Field

The invention relates to the technical field of communication, in particular to a shore sea emergency communication method and system based on an LED light source.

Background

Visible Light Communications (VLC) technology is a wireless optical communication technology that uses an LED (Light emitting diode) as a Light source and uses the atmosphere as a channel to modulate a baseband signal on Visible Light emitted by the LED for communication. The visible light communication has the advantages of wide available frequency band, large communication capacity, high transmission rate, strong anti-electromagnetic interference capability and the like, does not need electromagnetic spectrum permission, does not introduce electromagnetic interference to other equipment, provides a broadband access mode for an indoor wireless communication network, and is effective supplement for constructing an indoor wireless communication system. At present, under the condition that the communication distance is centimeter-level, the indoor visible light communication rate can reach 50Gpbs. Under the condition that the communication distance is meter-level, the visible light communication rate can reach more than 500 Mbps. By reducing the optical communication speed and expanding the visible light communication distance, tests show that the visible light can realize reliable communication of 1kbps under the condition of the distance of 13 km.

The lighthouse is a navigation aid platform deployed on coastal areas and island reefs, and mainly plays roles of light navigation aid, ship safe navigation guide and the like at present. The lighthouse emits recognizable signals at sea day and night for the ship to determine the position and provide danger warning for the ship. Many ships sailing near the lighthouse have high probability of occurrence of the distress condition of the ships. At present, a lighthouse mainly plays a role in light navigation assistance and does not have a role in light communication.

The LED navigation light is a novel navigation light which is generally popularized in recent years, and is increasingly paid more attention by maritime departments. The civil ship can utilize the existing LED lamps or add the LED lamps, and is matched with the beacon light to realize remote wireless optical communication. The LED navigation light has the technical characteristics that:

1. the nominal range is as high as 15.1 nautical miles;

2. the fixed light intensity is as high as 20000cd;

3. when the duration of the flash was 0.5 seconds, the effective intensity was 14285cd, range 15.1 nautical miles (T-0.74, white light);

4. the photoelectric conversion efficiency reaches 25cd/W.

In addition, to meet the long range requirement of the beacon light, the beacon light beam is usually narrow in the vertical direction, typically at a full width half maximum angle of 8 °. The beacon light has a certain rotation period, the typical rotation value is that the rotation period is 8 seconds after one circle, only 0.17 second is needed after 8 degrees of rotation, one-time message communication is required to be completed within 0.17 second of communication time, and the characteristic needs to be considered in the aspect of message format design.

Based on the technical characteristics, the lighthouse LED navigation mark lamp is properly modified, and a special information interaction message format is designed, so that the lighthouse LED navigation mark lamp has an optical communication function, and can perform information interaction with a shore-based emergency rescue service center through a wired network, a satellite or a microwave line-of-sight communication means. When a marine dangerous accident happens, the beacon LED beacon light sends data information such as alarm, weather and safety to the ship in danger through wireless light. The ship adopts a manual or automatic control method, SOS distress signals and alarm information are sent to the lighthouse LED navigation mark lamp through a ship-mounted LED lamp (such as a searchlight), and a shore and sea long-distance, bidirectional and real-time communication means under emergency conditions is provided

By properly modifying the existing beacon light and shipborne LED lamps and lanterns, and adding the beacon, handheld control management equipment and communication equipment such as microwaves and satellites, the beacon has the capability of shore remote communication, and can be used as an emergency communication means to realize information access and emergency communication guarantee between the object in danger and an emergency communication service system under the conditions of emergency events such as natural disasters, ship accident disasters, personnel emergency rescue and the like near a sea channel.

Disclosure of Invention

The embodiment of the invention provides a shore emergency communication method and a shore emergency communication system based on an LED light source, which utilize an LED beacon light and a shipborne LED lamp, take wireless light as an emergency communication means of a beacon and a ship, and add control management equipment and communication equipment such as microwaves and satellites by properly modifying the existing beacon light and shipborne LED lamp so that the beacon has shore remote communication capability.

The embodiment of the invention provides a shore sea emergency communication method based on an LED light source, which is applied to lighthouse control management equipment and comprises the following steps:

receiving first transmission information sent by a shore-based emergency service center or second transmission information sent by a shipborne LED lamp of a marine ship, wherein the first transmission information is at least one of business information, alarm information, safety information or meteorological information, and the second transmission information at least comprises distress alarm and distress signals;

extracting, caching and classifying the received first transmission information, if the first transmission information is service information to be forwarded, modulating, coding and up-converting the first transmission information, adjusting the amplification factor of an amplification circuit to enable a modulation signal to reach a required signal amplitude, loading the modulation signal onto an LED navigation mark lamp and sending the modulation signal;

decoding and demodulating the received second transmission information to obtain related information, and forwarding the related information to a shore-based emergency service center, wherein the second transmission information is sent in a preset mode through a shipborne LED lamp;

the wavelength of the signal sent by the LED beacon light is different from the wavelength of the signal sent by the shipborne LED lamp.

In some embodiments of the invention, after said extracting, buffering and classifying said received first transmission information, said method further comprises:

judging whether the first transmission information is a reading instruction or a parameter configuration instruction of a communication equipment state deployed on a lighthouse, and if so, feeding back the equipment state or performing parameter configuration based on the first transmission information;

if not, judging whether the first transmission information is the service information to be forwarded, otherwise, storing the transmission information and displaying the transmission information on a screen of the control management equipment.

In some embodiments of the present invention, the second transmission information is sent in a preset manner through the onboard LED lamp, specifically:

determining a primary communication time window and a transmittable data volume of the LED beacon light and the shipborne LED lamp based on the time of one rotation of the LED beacon light, a beam angle and a first optical communication rate, and transmitting the second transmission information, wherein the first transmission data volume of the second transmission information is not more than the transmittable data volume;

and if the second transmission information is information which is sent again after the ship-borne LED lamp sends the transmission information and receives the feedback information, the second transmission information is information which is sent again after the ship-borne LED lamp determines the positions of other ships and/or the LED beacon lamps corresponding to the feedback information based on the feedback information, and the transmission time required by the second transmission information is not less than the time corresponding to the primary communication time window.

In some embodiments of the present invention, the shore sea emergency communication method based on the LED light source further includes:

if the second transmission information is information which is sent again after the ship-borne LED lamp sends the transmission information and receives the feedback information, the ship-borne LED lamp sends the second transmission information for preset times within the transmission time of sending the second transmission information to other ships and/or positions of the LED beacon lamps corresponding to the feedback information.

The invention also provides a shore sea emergency communication method based on the LED light source, which is applied to shipborne LED lamp control management equipment and comprises the following steps:

receiving third transmission information sent by a handheld control management terminal or fourth transmission information sent by an LED beacon light of lighthouse control management equipment, wherein the third transmission information is information formed by message editing, inputting or forming vocoded speech information through the handheld control terminal and coding modulation;

sending the received third transmission information in a preset mode, so that the lighthouse control management equipment can receive the third transmission information, decode and demodulate the third transmission information to obtain related information, and forwarding the related information to a shore-based emergency service center;

and decoding and demodulating the received fourth transmission information to obtain related information.

In some embodiments of the invention, comprising: the sending the received third transmission information in a preset manner specifically includes:

determining a primary communication time window and a transmittable data volume of the LED beacon light and the shipborne LED lamp based on the time of one rotation of the LED beacon light, the beam angle and a first optical communication rate, and transmitting third transmission information, wherein the first transmission data volume of the third transmission information is not more than the transmittable data volume;

if feedback information of other ships and/or the LED beacon light is received, determining a first relative position of the other ships and/or the LED beacon light and a ship where the shipborne LED lamp is located based on the feedback information; and sending fifth transmission information including a second transmission data volume to other ships and/or the LED beacon light which feed back feedback information based on the first relative position, wherein the time of sending the transmission information by the shipborne LED lamp at the first relative position is not less than the time corresponding to the primary communication time window.

In some embodiments of the invention, the onboard LED lamp sends the fifth transmission information a preset number of times within the time that the first relative position sends the transmission information.

In some embodiments of the invention, the shipborne LED lamp is arranged on a servo control platform, so that the azimuth and the pitching angle of the optical axis of the shipborne LED lamp are adjusted through the servo control platform, and the servo control platform is connected with the handheld control management terminal;

before transmitting the third transmission information, the method further comprises:

determining a second relative position between the ship and the peripheral lighthouses based on the position coordinates of the lighthouses stored in advance and the current position of the ship;

after third transmission information sent by the handheld control management terminal is received, the servo control console is used for adjusting the position and the pitching angle of the optical axis of the shipborne LED lamp based on position adjustment information in the third transmission information, aligning the beam to the LED beacon lamp, locking the current position and the pitching angle, and continuously sending information at least including distress warning and distress calling to the lighthouse.

The invention also provides a shore sea emergency communication system based on the LED light source, which comprises:

the LED navigation mark lamp is arranged at the lighthouse end and used for sending and receiving optical communication signals, an LED driving circuit, a digital-analog conversion circuit and an analog-digital conversion circuit are arranged in the LED navigation mark lamp and used for optical signal-electric signal conversion and electric signal-optical signal conversion, and the LED navigation mark lamp rotates periodically.

The lighthouse control management equipment is deployed at a lighthouse end and is used for being interconnected with a shore-based emergency rescue service center, receiving and forwarding transmission information, reporting the state of lighthouse communication equipment and receiving a remote control command, and specifically comprises the steps of extracting, caching and classifying the received first transmission information, modulating, coding and up-converting the first transmission information if the first transmission information is service information to be forwarded, adjusting the amplification factor of an amplification circuit to enable a modulation signal to reach a required signal amplitude value, loading the modulation signal onto the LED beacon light and sending the modulation signal, decoding and demodulating the received second transmission information to obtain related information and forwarding the related information to the shore-based emergency service center, wherein the second transmission information is sent in a preset mode through a ship-borne LED lamp;

the shipborne LED lamp is deployed at a ship end, is installed on a servo control console and is used for sending and receiving optical communication signals, an LED driving circuit, a digital-analog conversion circuit and an analog-digital conversion circuit are arranged in the shipborne LED lamp so as to perform optical signal-electric signal conversion and electric signal-optical signal conversion, and the shipborne LED lamp is provided with a directional light beam;

the handheld control management terminal is deployed at a ship end, is used for carrying out voice code communication, message editing and inputting, is in communication connection with the shipborne LED lamp, and transmits a digital signal to the shipborne LED lamp after carrying out signal modulation coding and demodulation decoding, and is used for receiving a response or distress signal received by the shipborne LED lamp and displaying the received information; the handheld control management terminal further has a position and pitch angle resolving function, and is internally embedded with a Beidou or GPS positioning terminal and a navigation attitude measuring device, and is used for calculating the position and the pitch angle of the shipborne LED lamp according to the current position of the ship, the position of the lighthouse and a navigation attitude measuring result, and sending adjusting information to the private server console, so that the server console aims the light beam of the shipborne LED lamp at the LED beacon light at the lighthouse end based on the adjusting information.

In some embodiments of the present invention, the shore sea emergency communication system based on LED light source further includes:

the microwave line-of-sight communication equipment is used for constructing a transmission link for the lighthouse and the shore-based emergency rescue service center under the condition that the lighthouse and the shore-based emergency rescue service center form line-of-sight communication, and providing a channel for transmitting service information and management information of a lighthouse end;

the satellite communication equipment is used for constructing an over-the-horizon communication link for the lighthouse and the shore-based emergency rescue service center under the condition that the lighthouse and the shore-based emergency rescue service center do not have line-of-sight communication, and providing a channel for transmitting service information and management information;

and the sighting telescope is arranged at the top of the shipborne LED lamp, and the normal direction of the sighting telescope is parallel to the optical axis of the LED lamp so as to align the shipborne LED lamp to the beacon light through the sighting telescope.

The shore sea emergency communication method and system based on the LED light source provided by the embodiment of the invention have the following advantages: the beacon light and the shipborne LED lamp are utilized, wireless light is used as a beacon and ship emergency communication means, the existing beacon and shipborne LED lamp are properly modified, and a control management device and communication devices such as microwaves and satellites are added, so that the beacon has the shore remote communication capability, and can be used as an emergency communication means under the conditions of emergencies such as natural disasters, ship accident disasters and personnel emergency rescue near a sea channel, and the information access and emergency communication guarantee between an object in danger and an emergency communication service system is realized.

Drawings

Fig. 1 is a flowchart of broadcasting emergency communication from a lighthouse to the sea in the shore-sea emergency communication method based on an LED light source according to an embodiment of the present invention;

fig. 2 is a flowchart of distress information sending by a shipborne LED lamp of a distress ship in the shore sea emergency communication method based on an LED light source according to the embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a communication device at a lighthouse end in a shore emergency communication system based on an LED light source according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a beacon control management device in a shore-sea emergency communication system based on an LED light source according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a lighthouse in a shore-sea emergency communication system based on an LED light source according to an embodiment of the present invention for performing optical communication.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention is further described below with reference to the accompanying drawings and the detailed description.

The phrases "in one embodiment," "in another embodiment," "in yet another embodiment," "in an embodiment," "in some embodiments," or "in other embodiments" may be used in this specification to refer to one or more of the same or different embodiments in accordance with the invention.

Specific embodiments of the present invention are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Well-known and/or repeated functions and configurations have not been described in detail so as to avoid obscuring the invention in unnecessary or unnecessary detail based on the user's historical actions. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure.

The embodiment of the invention provides a shore sea emergency communication method based on an LED light source, which is applied to lighthouse control management equipment, and as shown in fig. 1 and fig. 3 to 4, the shore sea emergency communication method comprises the following steps:

receiving first transmission information sent by a shore-based emergency service center or second transmission information sent by a shipborne LED lamp of a marine ship, wherein the first transmission information is at least one of business information, alarm information, safety information or meteorological information, and the second transmission information at least comprises distress alarm and distress signals; specifically, the first transmission information may be transmitted by a shore-based emergency rescue service center through a communication means such as a cable network, microwave, satellite, and the like.

Extracting, caching and classifying the received first transmission information, if the first transmission information is service information to be forwarded, modulating, coding and up-conversion operating the first transmission information, enabling a modulation signal to reach a required signal amplitude value by adjusting the amplification factor of an amplifying circuit, loading the modulation signal onto an LED beacon light and sending the modulation signal, and after the LED beacon light receives the service information processed by modulation and coding, driving the LED beacon light to perform modulation transmission by adopting light with a certain wavelength, so as to realize unidirectional broadcast sending of information such as alarm information, safety information or meteorological information; after the shipborne LED lamp receives the modulation coding information loaded on the optical signal, demodulation, decoding and signal extraction are carried out to obtain related information;

in this embodiment, the lighthouse control management device mainly comprises a main control module, an information sending processing module, and an information receiving processing module, wherein the main control module mainly performs data caching, service type identification, interface adaptation, and service state acquisition, the information sending processing module mainly modulates a baseband digital signal and loads the baseband digital signal onto a carrier, the information receiving processing module mainly performs analog-digital conversion, digital signal down-conversion, digital filtering, demodulation, differential decoding, and the like, and restores a carrier modulation signal to a baseband signal, the lighthouse control management device has various types of interfaces, can interconnect with a microwave line-of-sight communication device and a satellite communication device, acquires states of the microwave and satellite communication devices, receives a remote control instruction, and an output of the information sending processing module and an input of the information receiving processing module of the lighthouse control management device are connected to a driving circuit of a lighthouse LED beacon light. A negative feedback circuit is added on a driving circuit of the LED beacon light to inhibit direct current, so that the preamplifier is prevented from being saturated;

in this embodiment, after the extracting, caching and classifying the received first transmission information, it is actually determined whether the first transmission information is a reading instruction or a parameter configuration instruction for a communication device state deployed on a lighthouse, and if so, feeding back a device state or performing parameter configuration based on the first transmission information; if not, judging whether the first transmission information is the service information to be forwarded, if so, executing the forwarding process, otherwise, storing the transmission information and displaying the transmission information through control management equipment, such as displaying on a screen or performing projection display.

the wavelength of the signal sent by the LED beacon light is different from that of the signal sent by the shipborne LED lamp, so that interference of downlink (from a lighthouse to a ship) and uplink (from the ship to the lighthouse) communication signals is avoided.

determining a one-time communication time window and a transmittable data volume of the LED beacon light and the shipborne LED lamp based on the time of one rotation of the LED beacon light, the beam angle of the LED beacon light and the first optical communication rate of the LED beacon light, and specifically,

if the time of the LED beacon light of the lighthouse rotating for one circle is T, the wave beam angle of the beacon light is theta (unit is degree), and the one-time communication time window M of the lighthouse (LED beacon light) and the ship (ship-borne LED lamp) is as follows:

assuming that the optical communication rate is R, the amount of data transmittable in one communication time window is:

N＝R·M

the communication message length between the lighthouse and the ship should be less than N.

The special communication message format of the lighthouse and the ship is as follows, mainly comprising a starting identifier, a data identifier, data content, a check unit and an ending identifier, and in order to ensure that the total length of the message is less than N, the length of the data content should be less than N-10 bytes.

Start mark	Packet sequence number	Data content	Frame check	Ending mark
					2 bytes	2 bytes	< N-10 bytes	4 bytes	2 bytes

In this embodiment, as shown in fig. 5, when the lighthouse communicates with the ship in distress (code a), interactive messages can be sent to each other, for example: the distress ship A sends distress rescue information, the lighthouse sends reply confirmation after receiving the distress rescue information, the lighthouse sends state inquiry, and the distress ship A replies interactive information such as specific content required for rescue. However, since the LED beacon light of the beacon is rotated at a predetermined period, another message may be sent outside the communication angle range α between the LED beacon light of the beacon and the ship in danger a, for example, request support information for broadcasting the ship in danger a to other ships.

After determining a one-time communication time window and a transmittable data amount of the onboard LED lamp, transmitting the second transmission information, a first transmission data amount of which is not more than the transmittable data amount;

and if the second transmission information is information which is sent again after the ship-borne LED lamp sends the transmission information and receives the feedback information, the second transmission information is information which is sent again after the ship-borne LED lamp determines the positions of other ships and/or the LED beacon lamps corresponding to the feedback information based on the feedback information, and the transmission time required by the second transmission information is not less than the time corresponding to the primary communication time window. For example, when a ship needs to be rescued in case of fire, the distress warning and rescuing signal is transmitted by the first transmission data volume which is not larger than the transmission data volume when the distress warning and rescuing signal is initially transmitted, after the distress warning and rescuing signal is transmitted, if other ships and/or lighthouses feed back the transmitted distress warning and rescuing signal, the current ship distress is proved to be known from the outside, and then when the distress warning and rescuing signal is transmitted again by the ship, a new distress warning and rescuing signal can be generated by editing according to the actual situation of the rescue required in distress, namely, by combining the actual demand of the current distress, and meanwhile, when the distress warning and rescuing signal is transmitted outwards, the new distress warning and rescuing signal can be transmitted to other ships and/or lighthouses which have fed back information in a targeted manner by combining the relative positions of other ships and/or lighthouses which have the information and are required to rescue, so that the rescue is facilitated by other ships and/or lighthouses which have fed back information.

Further, in this embodiment, the shore sea emergency communication method based on the LED light source further includes:

if the second transmission information is information which is sent again after the ship-borne LED lamp sends the transmission information and receives the feedback information, the ship-borne LED lamp sends the second transmission information for preset times within the transmission time of sending the second transmission information to the positions of other ships and/or LED beacon lamps corresponding to the feedback information. Specifically, by taking the above example as an example, after the distress warning and rescue signal sent by the ship needing rescue in distress is fed back by another ship and/or lighthouse, and by combining the relative position of the other ship and/or lighthouse which has given the feedback information and the ship needing rescue in distress, when a new distress warning and rescue signal is sent to the other ship and/or lighthouse which has fed back information in a targeted manner again, the shipborne LED lamp can stay for a relatively long time in the direction toward the other ship and/or lighthouse which has fed back information, the stay time can be longer than the time corresponding to the one-time communication time window, and the new distress warning and rescue signal is sent for a preset number of times, such as at least 2 times, 3 times, and the like, where no explicit limitation is made, so as to ensure that the other ship or lighthouse which has fed back information can accurately receive the rescue information.

The embodiment of the invention also provides a shore sea emergency communication method based on the LED light source, which is applied to the shipborne LED lamp control management equipment, and as shown in fig. 2 to 4, the shore sea emergency communication method comprises the following steps:

receiving third transmission information sent by a handheld control management terminal or fourth transmission information sent by an LED beacon light of lighthouse control management equipment, wherein the third transmission information is information formed by message editing, voice code inputting or voice code forming through the handheld control terminal and code modulation, specifically, the third transmission information can be information formed by message editing, voice code inputting or voice code forming on the handheld control management terminal by personnel, the third transmission information is formed by code modulation, and the third transmission information can be distress warning and distress signals;

sending the received third transmission information in a preset mode, so that the lighthouse control management equipment can receive the third transmission information, perform decoding demodulation and signal extraction to obtain related information, sending the related information to the lighthouse control management equipment, and further forwarding the related information to a shore-based emergency service center through a wired network, microwaves, satellites and the like;

In the embodiment, in order to reduce background light interference, an optical filter is added between an LED light source and a fresnel lens of a beacon light and a ship-borne light, the central wavelength of the optical filter should correspond to the radiation peak wavelength of the LED, and the values of the peak transmittance and the cut-off depth should be designed according to communication requirements;

determining a primary communication time window and a transmittable data amount of the LED beacon light and the shipborne LED lamp based on the time of one rotation of the LED beacon light, the beam angle and the first optical communication rate, specifically,

and if the time of one circle of rotation of the LED beacon light is T and the beam angle is theta (unit is degree), a one-time communication time window M of the lighthouse and the ship is as follows:

assuming that the optical communication rate is R, the amount of data that can be transmitted in one communication time window is:

N＝R·M

After determining a one-time communication time window and a transmittable data volume of the LED beacon light and the shipborne LED lamp, sending the third transmission information, wherein a first transmission data volume of the third transmission information is not larger than the transmittable data volume;

if feedback information of other ships and/or the LED navigation mark lamp is received, determining a first relative position of the other ships and/or the LED navigation mark lamp and a ship where the shipborne LED lamp is located based on the feedback information;

and sending fifth transmission information including a second transmission data volume to other ships and/or the LED beacon light which feed back feedback information based on the first relative position, wherein the time of sending the transmission information by the shipborne LED lamp at the first relative position is not less than the time corresponding to the primary communication time window.

For example, when a ship needs to be rescued in case of fire, the distress warning rescue signal is sent by using a first transmission data volume which is not more than the transmission data volume when the ship initially sends the distress warning rescue signal, after the distress warning rescue signal is sent, if other ships and/or lighthouses feed back the sent distress warning rescue signal, the current ship distress is proved to be known from the outside, and then when the distress warning rescue signal is sent again by the ship, a new distress warning rescue signal can be edited and generated according to the actual situation of the distress required rescue, namely, according to the actual requirement of the current distress, and meanwhile, when the distress warning rescue signal is sent to the outside, the new distress warning rescue signal can be sent to other ships and/or lighthouses which have fed back information in a targeted manner by combining the relative positions of other ships and/or lighthouses which have fed back information and the ship which needs to be rescued in case of distress, so that the other ships and/or lighthouses which have fed back information can provide the actually required rescue.

In some embodiments of the invention, the onboard LED lamp sends the fifth transmission information a preset number of times within the time that the first relative position sends the transmission information. Specifically, by taking the above example as an example, after the distress warning and rescue signal sent by the ship needing rescue in distress is fed back by another ship and/or lighthouse, in combination with the relative position of the other ship and/or lighthouse having fed back the information and the ship needing rescue in distress, when a new distress warning and rescue signal is sent to the other ship and/or lighthouse having fed back the information in a targeted manner, the shipborne LED lamp can stay for a relatively long time in a direction toward the other ship and/or lighthouse having fed back the information, the stay time can be longer than the time corresponding to the one-time communication time window, and the new distress warning and rescue signal is sent for a preset number of times, such as at least 2 times, 3 times, and the like, without explicit limitation, so as to ensure that the other ship and/or lighthouse having fed back the information can accurately receive the rescue information.

after third transmission information sent by the handheld control management terminal is received, the servo control console is used for adjusting the position and the pitching angle of the optical axis of the shipborne LED lamp based on position adjustment information in the third transmission information, aligning a beam to the LED beacon lamp and locking the current position and the pitching angle, and continuously sending information at least including distress alarm and distress to a lighthouse. Certainly, on the premise that the second relative position of the ship and the lighthouse around the ship is known, the distress warning and rescue signal generated by editing can be sent to the lighthouse in a targeted manner by combining the actual requirements of the current distress according to the relative position of the lighthouse and the ship needing rescue when the distress occurs, the shipborne LED lamp can stay for a relatively long time in the direction towards the relative position of the known lighthouse, the stay time can be longer than the time corresponding to the primary communication time window, and further the distress warning and rescue signal generated by editing according to the actual requirements of the current distress is sent for a preset number of times, such as at least sending for 2 times and 3 times, and the like, so that clear limitation is not made, and the rescue information can be accurately received by other ships or lighthouses with feedback information.

An embodiment of the present invention further provides a shore sea emergency communication system based on an LED light source, as shown in fig. 3 to 4, including:

the LED navigation light is arranged at a lighthouse end and used for sending and receiving optical communication signals, an LED driving circuit, a digital-analog conversion circuit and an analog-digital conversion circuit are arranged in the LED navigation light to carry out optical signal-electric signal conversion and electric signal-optical signal conversion, the LED navigation light mainly comprises a DC-DC module, a driving control and current detection circuit, an LED light group and the like, and the LED navigation light rotates periodically. The direct-current power supply is added to the anode of the LED lamp group after being converted by the DC-DC module, the signal modulated by the signal sending and processing module is loaded to the cathode of the LED lamp group after passing through the driving control and current detection circuit, the current change flowing through the LED lamp is controlled by controlling the voltage change of the cathode of the LED lamp group, and in the actual use, the current beacon lamp can be reformed based on the current beacon lamp in the lighthouse;

the system comprises a lighthouse control management device, a lighthouse control management device and a shore-based emergency rescue service center, wherein the lighthouse control management device comprises modulation coding and demodulation functions, can edit and analyze an information message, displays information on a screen of the control management device, is interconnected with the shore-based emergency rescue service center through communication devices such as a shore-based wired network, a microwave and a satellite, receives and forwards transmission information, reports the state of the lighthouse communication device, and receives a remote control command, and specifically comprises the functions of extracting, caching and classifying received first transmission information, modulating the first transmission information if the first transmission information is service information to be forwarded, coding and up-converting, adjusting the amplification factor of an amplification circuit to enable a modulation signal to reach a required signal amplitude value, loading the modulation signal onto an LED beacon light and sending the modulation signal, decoding and demodulating the received second transmission information to obtain related information, and forwarding the related information to the shore-based emergency service center, and sending the second transmission information to the shore-based emergency service center through a ship-borne LED light fixture in a preset mode; in this embodiment, the lighthouse control management device mainly comprises a main control module, an information sending processing module, and an information receiving processing module, wherein the main control module mainly performs data caching, service type identification, interface adaptation, and service state acquisition, the information sending processing module mainly modulates a baseband digital signal and loads the baseband digital signal onto a carrier, the information receiving processing module mainly performs analog-digital conversion, digital signal down-conversion, digital filtering, demodulation, differential decoding, and the like, and restores a carrier modulation signal to a baseband signal, the lighthouse control management device has various types of interfaces, can interconnect with a microwave line-of-sight communication device and a satellite communication device, acquires states of the microwave and satellite communication devices, receives a remote control instruction, and an output of the information sending processing module and an input of the information receiving processing module of the lighthouse control management device are connected to a driving circuit of a lighthouse LED beacon light. A negative feedback circuit is added on a driving circuit of the LED beacon light to inhibit direct current, so that the preamplifier is prevented from being saturated. As an example, when data is transmitted, the lighthouse control management device sends information to be transmitted to an internal transmission processing module, performs data differential coding and framing, performs digital-to-analog conversion and then up-converts to 250KHz, performs 2DPSK modulation using a DDS, and drives an intelligent lamp group module to turn on and off at a high speed to transmit data information after amplification. When receiving data, receiving a filtered optical signal, converting the filtered optical signal into photocurrent and amplifying the photocurrent, converting a current signal into a voltage signal through a pre-transresistance amplifier and amplifying the voltage signal, introducing a feedback circuit to inhibit direct current, and preventing pre-amplification saturation; the data are sent to an FPGA after analog-to-digital conversion for down-conversion, digital filtering, demodulation and differential decoding, and then sent to a main control module, and after the main control module identifies the service types, relevant information is extracted and then forwarded to a shore-based emergency rescue service center through a wired network, microwaves, satellites and other means.

The shipborne LED lamp is arranged at a ship end, is installed on a servo control console and is used for sending and receiving optical communication signals, an LED driving circuit, a digital-analog conversion circuit and an analog-digital conversion circuit are arranged in the shipborne LED lamp to carry out optical signal-electric signal conversion and electric signal-optical signal conversion, the shipborne LED lamp mainly comprises a DC-DC module, a driving control and current detection circuit, an LED lamp group and the like, and the shipborne LED lamp is provided with directional light beams. The direct-current power supply is added to the anode of the LED lamp bank after being converted by the DC-DC module, the signal modulated by the signal sending and processing module is loaded to the cathode of the LED lamp bank after passing through the driving control and current detection circuit, and the current change flowing through the LED lamp is controlled by controlling the voltage change of the cathode of the LED lamp bank; in this embodiment, increase bluetooth, WIFI communication module in the on-board LED lamp, can carry out radio communication through bluetooth, WIFI and on-board control management terminal, the personnel of being convenient for remove in the ship. Meanwhile, a wired interface is arranged, and wired communication can be carried out with the shipborne and shipborne control management terminal through a serial port. The handheld control management terminal is deployed at a ship end, is used for carrying out voice code communication or message editing and inputting, is in communication connection with the shipborne LED lamp, and transmits a digital signal to the shipborne LED lamp after carrying out signal modulation coding and demodulation decoding, and is used for receiving a response or distress signal received by the shipborne LED lamp and displaying the received information, for example, the received information can be displayed through a screen or projected; the handheld control management terminal further has a position and pitch angle resolving function, a Beidou or GPS positioning terminal and a navigation attitude measuring device are embedded inside the handheld control management terminal and are used for calculating the position and pitch angle of the shipborne LED lamp according to the current position of the ship, the position of the lighthouse and a navigation attitude measuring result, and sending adjusting information to the private server console so that the server console can aim the light beam of the shipborne LED lamp at the LED beacon light at the lighthouse end based on the adjusting information.

In this embodiment, the handheld control management terminal has an on-off indication function, and is aligned to transmit and receive, and when a communication link can be established, the on-off indication lamp is turned on, otherwise, the indication lamp is turned off, the supported voice rate is not less than 4Kbps, the message length is not less than 1000 bytes, and the interface communication rate is not more than 24Mbps.

the microwave line-of-sight communication equipment is used for constructing a transmission link for the lighthouse and the shore-based emergency rescue service center under the condition that the lighthouse and the shore-based emergency rescue service center form line-of-sight communication, and providing a channel for transmitting service information and management information of a lighthouse end; in this embodiment, the microwave line-of-sight communication device is composed of an indoor baseband processing device, an outdoor radio frequency device, and an antenna. The typical working frequency of the microwave line-of-sight communication equipment is 7 GHz-8 GHz, the transmission rate is more than or equal to 64Mb/s, and the communication distance is not less than 50km at most.

The satellite communication equipment is used for constructing an over-the-horizon communication link for the lighthouse and the shore-based emergency rescue service center under the condition that the lighthouse and the shore-based emergency rescue service center do not have line-of-sight communication, and providing a channel for transmitting service information and management information; in this embodiment, the satellite communication device uses a Ku band synchronous orbit satellite to transmit voice, data, and image IP data, thereby realizing bidirectional 4Mbps information rate return

In this embodiment, the lighthouse control management device can be used for health management of microwave line-of-sight communication devices and satellite communication devices.

And the sighting telescope is arranged at the top of the shipborne LED lamp, and the normal direction of the sighting telescope is parallel to the optical axis of the LED lamp, so that the shipborne LED lamp is aligned to the beacon light through the sighting telescope, and rapid alignment and communication are realized.

In order to facilitate understanding of the above technical solutions, the following describes the work flow in detail by using specific examples, which are as follows: the lighthouse LED beacon light and the shipborne LED light use light with two wavelengths for communication so as to avoid interference of downlink (lighthouse to ship) and uplink (ship to lighthouse) communication signals. The downlink communication signal may adopt infrared light, and the uplink communication signal may adopt white light.

The information flow from the shore-based emergency service center to the marine vessel is as follows: the shore-based emergency rescue service center sends business information, alarm information, safety information, meteorological information and the like to the lighthouse control management equipment through communication means such as a wired network, microwaves, satellites and the like, the lighthouse control management equipment extracts, caches and classifies the information, and if the information is a reading instruction or a parameter configuration instruction of the lighthouse communication equipment state, the information is configured according to the feedback equipment state or the parameter configuration; otherwise, judging whether the service information is to-be-forwarded service information, if so, performing modulation, coding and up-conversion operation, and sending the service information to the LED beacon light; otherwise, storing the information and displaying the information on a screen of the control management equipment; the LED beacon light is driven to adopt light with a certain wavelength for modulation transmission after receiving the service information processed by modulation coding, so that unidirectional broadcast transmission of information such as alarm, safety, weather and the like is realized; after receiving the modulation coding information loaded on the optical signal, the shipborne LED lamp carries out demodulation, decoding and signal extraction to obtain related information.

The information flow from the marine vessel to the shore-based emergency service center is as follows: the personnel edit, input or form voice code message information on the hand-held control management terminal, the voice code message information is sent to the shipborne LED lamp through code modulation, the shipborne LED adopts light with different wavelengths from the lighthouse beacon light to carry out modulation transmission, the distress alarm and distress signal are sent to the lighthouse beacon light, the lighthouse beacon light completes decoding demodulation and signal extraction to obtain related information and send the related information to lighthouse control management equipment, and the lighthouse control management equipment forwards the information to a shore-based emergency rescue service center through a wired network, microwaves, satellites and the like.

In order to reduce background light interference, an optical filter is added between an LED light source and a Fresnel lens of a beacon light and a shipborne lamp, the central wavelength of the optical filter corresponds to the radiation peak wavelength of the LED, and the values of the peak transmittance and the cut-off depth are designed according to communication requirements; for example, for infrared light communication, a filter with a center wavelength of 750nm and a half width of 40nm may be used for band-pass filtering.

And designing a corresponding message format according to the rotation period of the lighthouse and the wave beam angle of the beacon light, and ensuring that one-time reliable communication is completed in a time window for establishing optical communication between the lighthouse and the ship.

The time of one circle of rotation of the lighthouse is set as 8 seconds, the wave beam width of the beacon light is set as 8 degrees, and then a communication time window M between the lighthouse and the ship is set as follows:

assuming that the optical communication rate is 2.4kbps, the amount of data transmittable in one communication time window is:

N＝0.17·2.4＝426bit

the communication message length of the lighthouse and the ship is less than 426 bits, and the communication message length is converted into bytes and rounded, and is 53 bytes.

The special communication message format of the lighthouse and the ship is as follows, mainly comprising a starting identifier, a data identifier, data content, a check unit and an ending identifier, and in order to ensure that the total length of the message is less than 53, the length of the data content should be less than 43 bytes.

The lighthouse control management equipment mainly comprises a main control module, an information sending processing module and an information receiving processing module. The main control module mainly performs data caching, service type identification, interface adaptation and service state acquisition. The information sending and processing module mainly modulates the baseband digital signals and loads the baseband digital signals onto a carrier, and mainly comprises a DDS circuit, a modulation circuit, an amplification circuit, a control circuit and the like. The information receiving and processing module mainly completes analog-digital conversion, digital signal down-conversion, digital filtering, demodulation, differential decoding and other processing, restores the carrier modulation signal to a baseband signal, and mainly comprises a receiving lens, an APD (avalanche photo diode), a high-voltage module, a transimpedance amplifier, a direct current offset circuit, an AGC (automatic gain control) circuit, an A/D (analog/digital) converter, a programmable logic device FPGA (field programmable gate array) and the like.

The lighthouse control management equipment is provided with various types of interfaces, can be interconnected with microwave line-of-sight communication equipment and satellite communication equipment, collects the states of the microwave and satellite communication equipment, and receives remote control instructions. The module mainly comprises a DDS circuit, a modulation circuit, an amplification circuit, a control circuit and the like.

The output of the information sending processing module and the input of the information receiving processing module of the lighthouse control management equipment are connected to the driving circuit of the lighthouse LED navigation mark lamp. A negative feedback circuit is added on a driving circuit of the LED beacon light to inhibit direct current, so that the preamplifier is prevented from being saturated. And the noise introduced by the transimpedance amplification circuit is reduced by adopting an extremely low noise transimpedance amplification circuit and a direct current and low frequency cancellation circuit.

Increase bluetooth, WIFI communication module in the on-board LED lamp, can carry out radio communication through bluetooth, WIFI and on-board control management terminal, the personnel of being convenient for remove in the ship. And a wired interface is arranged, and wired communication can be carried out with the shipborne control management terminal through an RS485 serial port.

The shipborne control management terminal has an on-off indicating function, the receiving and sending are aligned, when a communication link can be established, the on-off indicating lamp is turned on, otherwise, the indicating lamp is turned off.

According to the technical scheme, ships sailing near the lighthouse are numerous, the ship distress situation has the high probability, when nearby ships are in distress, and ships/personnel have emergency rescue requirements, the distress signal can be sent through lamplight and the like. After receiving the rescue information, the emergency communication service system broadcasts the rescue announcement to users in the nearby area through the light on the lighthouse, so that the information such as the position information and the ship state of the ship in distress can be rapidly shared in the nearby sea area, the ship which calls the nearby sea area to sail and operate can be rapidly put into rescue, the emergency power cooperative action of all parties participating in the search and rescue organization can be guaranteed, and the rescue efficiency and capability can be improved.

According to the application requirement scene, the shore-sea emergency communication method and system based on the LED light source provided by the embodiment of the invention adopt a satellite communication or microwave line-of-sight communication return link based on the LED visible light as a communication means, and realize information access and emergency communication guarantee with a shore-based rescue service center. When an emergency happens, the beacon emergency communication lamp sends data information such as alarm, weather and safety to the ship through infrared light, the ship can send SOS distress signals and alarm information to the beacon emergency communication system through a manual or automatic control method, and communication requirements under the emergency such as natural disasters, accident disasters and emergency rescue can be met.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims

1. A shore sea emergency communication method based on an LED light source is applied to lighthouse control management equipment and is characterized by comprising the following steps:

decoding and demodulating the received second transmission information to obtain related information, and forwarding the related information to a shore-based emergency service center, wherein the second transmission information is sent in a preset manner through a shipborne LED lamp, specifically, a primary communication time window and a transmittable data volume of the LED beacon light and the shipborne LED lamp are determined based on the time of one rotation of the LED beacon light, a beam angle and a first optical communication rate, the second transmission information is sent, the LED beacon light rotates in a preset period, and another message is sent outside a communication angle range of a ship corresponding to the LED beacon light and the shipborne LED lamp sending the second transmission information;

2. The LED light source based shore sea emergency communication method of claim 1, wherein after said extracting, buffering and classifying said received first transmission information, said method further comprises:

3. The LED light source-based shore sea emergency communication method according to claim 1, wherein a first transmission data volume of said second transmission information is not greater than said transmittable data volume;

4. The LED light source-based shore sea emergency communication method according to claim 3, further comprising:

5. A shore sea emergency communication method based on an LED light source is applied to shipborne LED lamp control management equipment and is characterized by comprising the following steps:

receiving third transmission information sent by a handheld control management terminal or fourth transmission information sent by an LED (light-emitting diode) navigation mark lamp of lighthouse control management equipment, wherein the third transmission information is information formed by message editing, message inputting or voice code conversation information formation through the handheld control terminal and code modulation;

sending the received third transmission information in a preset manner, so that a lighthouse control management device can receive the third transmission information, decode and demodulate the third transmission information, obtain related information, and forward the related information to a shore-based emergency service center, wherein the received third transmission information is sent in a preset manner, specifically, a primary communication time window and a transmittable data volume of the LED beacon light and the shipborne LED lamp are determined based on the time of one rotation of the LED beacon light, a beam angle and a first optical communication rate, the third transmission information is sent, the LED beacon light rotates in a preset period, and another message is sent outside a communication angle range of a ship corresponding to the LED beacon light and the shipborne LED lamp;

6. The LED light source-based shore sea emergency communication method according to claim 5, comprising: the sending the received third transmission information in a preset manner specifically includes:

if feedback information of other ships and/or the LED navigation mark lamp is received, determining a first relative position of the other ships and/or the LED navigation mark lamp and a ship where the shipborne LED lamp is located based on the feedback information; and sending fifth transmission information including a second transmission data volume to other ships and/or the LED beacon light which feed back feedback information based on the first relative position, wherein the time of sending the transmission information by the shipborne LED lamp at the first relative position is not less than the time corresponding to the primary communication time window.

7. The LED light source based shore sea emergency communication method of claim 6,

and the shipborne LED lamp sends the fifth transmission information for preset times within the time of sending the transmission information at the first relative position.

8. The LED light source-based coastal emergency communication method according to claim 7,

the shipborne LED lamp is arranged on the servo control platform so as to adjust the direction and the pitching angle of the optical axis of the shipborne LED lamp through the servo control platform, and the servo control platform is connected with the handheld control management terminal;

before sending the third transfer information, the method further comprises:

after third transmission information sent by the handheld control management terminal is received, the servo control console is used for adjusting the position and the pitching angle of the optical axis of the shipborne LED lamp based on position adjustment information in the third transmission information, aligning a beam to the LED beacon lamp and locking the current position and the pitching angle, and continuously sending information at least including distress alarm and distress to a lighthouse.

9. A shore sea emergency communication system based on LED light sources, comprising:

the LED navigation mark lamp is arranged at the lighthouse end and used for sending and receiving optical communication signals, an LED driving circuit, a digital-analog conversion circuit and an analog-digital conversion circuit are arranged in the LED navigation mark lamp so as to perform optical signal-electric signal conversion and electric signal-optical signal conversion, and the LED navigation mark lamp rotates periodically;

the handheld control management terminal is deployed at a ship end, is used for carrying out voice code communication, message editing and inputting, is in communication connection with the shipborne LED lamp, and transmits a digital signal to the shipborne LED lamp after carrying out signal modulation coding and demodulation decoding, and is used for receiving a response or distress signal received by the shipborne LED lamp and displaying the received information; the handheld control management terminal also has a position and pitch angle resolving function, and is internally embedded with a Beidou or GPS positioning terminal and a navigation attitude measuring device, and is used for calculating the position and pitch angle of the shipborne LED lamp according to the current position of the ship, the position of the lighthouse and the navigation attitude measuring result, and sending adjusting information to the servo control console so that the servo control console aims the light beam of the shipborne LED lamp at the LED beacon light at the lighthouse end based on the adjusting information;

the second transmission information is sent in a preset manner through a shipborne LED lamp, specifically, a primary communication time window and a transmittable data volume of the LED beacon light and the shipborne LED lamp are determined based on the time of one rotation of the LED beacon light, a beam angle and a first optical communication rate, the second transmission information is sent, the LED beacon light rotates in a preset period, and another message is sent outside a communication angle range of a ship corresponding to the LED beacon light and the shipborne LED lamp sending the second transmission information.

10. The LED light source-based shore sea emergency communication system of claim 9, further comprising: