Emergency communication system based on new-generation AIS and multimode communication fusion terminal

Abstract

The invention discloses an emergency communication system based on a new-generation AIS and multi-mode communication fusion terminal. The emergency communication system comprises the new-generation AIS and multi-mode communication fusion terminal, and an AIS system, a Beidou system, an offshore broadband system and a VHF system which are connected with the new-generation AIS and multi-mode communication fusion terminal. The fusion terminal based on the new-generation AIS and the multimode communication comprises a main panel, the main panel is connected with a radio frequency module which is used for realizing mobile communication and WIFI network coverage of a ship and a surrounding weak signal area, a converged communication processing module which is in butt joint with each shipborne device to realize multimode communication, a display screen which is used for realizing data display and a loudspeaker which is used for realizing voice broadcast. According to the invention, an efficient and reliable communication solution can be provided for marine safety of ships and sailors, so that the marine data communication capability and the efficiency and success rate of accident help seeking are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship communications, and in particular to an emergency communication system based on a new generation AIS and multi-mode communication fusion terminal. Background Art

[0002] In the prior art, a method and system for dispatching marine emergency communications with application number CN202410822245 preliminarily classifies the communication resources of the communication information in the marine emergency scene area. Through the preliminary communication classification, the immediate response requirements, task priority instructions, routine monitoring data, ship operation safety data, etc. are adjusted through the earliest deadline algorithm to adjust the instruction set priority, including the processing order of emergency communication data, the order arrangement of routine communication data, and the queue update strategy. The configuration strategy includes UAV resource configuration, shipborne platform resource configuration, bandwidth allocation scheme, and network resource priority setting. Multi-criteria decision analysis is used to adjust link parameters according to real-time evaluation of communication service duration and coverage, including power control and channel selection, generate link adaptability adjustment information, and give priority to sending emergency communication information. The priority sending of emergency information is achieved through platform scheduling.

[0003] The disadvantage of this solution is that although it provides a communication method that can be sent in priority, the network exchange capacity and information transmission method are relatively simple. When a fishing boat fails or is in danger at sea, it is impossible to send emergency information through multiple terminals, multiple communication methods, and multiple transmission channels. According to the existing technical solution, if a single communication channel is abnormal, the emergency message cannot be effectively sent to the rescue center. Due to the above shortcomings, the current solution cannot ensure the timely and concurrent transmission of information in an emergency, which will affect the timeliness and effectiveness of the rescue operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an emergency communication system based on a new generation of AIS and a multi-mode communication fusion terminal, which can provide an efficient and reliable communication solution for the maritime safety of ships and crew members, thereby improving the maritime data communication capability and the efficiency and success rate of accident rescue.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0006] An emergency communication system based on a new generation AIS and multi-mode communication fusion terminal, comprising a new generation AIS and multi-mode communication fusion terminal and an AIS system, a Beidou system, a maritime broadband system and a VHF system connected to the new generation AIS and multi-mode communication fusion terminal; the new generation AIS and multi-mode communication fusion terminal comprises a main panel, the main panel is connected with a radio frequency module for realizing mobile communication and WIFI network coverage of ships and surrounding weak signal areas, a fusion communication processing module for connecting various shipborne equipment to realize multi-mode communication, a display screen for realizing data display and a loudspeaker for realizing voice broadcasting;

[0007] The fusion communication processing module includes an algorithm CPU connected to the main panel, an ARM processor connected to the algorithm CPU, a protocol conversion baseboard connected to the ARM processor, and an AIS signal interface connected to the protocol conversion baseboard for connecting to the AIS system, a Beidou satellite interface of the Beidou system, a maritime broadband interface of the maritime broadband system, a VHF device interface of the VHF system, and a communication network interface of the communication network;

[0008] The protocol conversion baseboard is a serial communication conversion module used to achieve interconnection between different communication protocols;

[0009] The ARM processor includes a data processing unit for implementing data processing and a signal processing unit for implementing signal processing;

[0010] The algorithm CPU is used to realize the security, reliability and compression of data received and sent by the emergency communication system through the fusion communication processing module.

[0011] Preferably, the algorithm CPU provides a data verification and error correction mechanism for the AIS system, and the data verification and error correction mechanism for the AIS system includes a cyclic redundancy check mechanism, static information and dynamic information matching check, abnormal point data detection and fault tolerance mechanism.

[0012] Preferably, the algorithm CPU provides a data check and error correction mechanism for the Beidou system, and the data check and error correction mechanism for the Beidou system includes BCH code encoding, interleaving mode, XOR check and check code verification.

[0013] Preferably, the algorithm CPU provides a self-developed compression algorithm AB24, which combines the dictionary coding technology of the LZ77 algorithm and the statistical characteristics of the Markov model, uses a sliding window and a hash table to find repeated string segments, and replaces the repeated parts with pointers, uses the Markov chain model for probability estimation, optimizes coding efficiency, and usually uses binary arithmetic coding or range coding to achieve efficient probability coding; the specific method is as follows: perform preliminary processing on the input data, including but not limited to blocking and filtering; search for the longest matching string in the sliding window, and represent the matching string with a pointer and length; use the Markov model to estimate the probability of each symbol appearing, encode according to the probability estimation result, and generate compressed data; further optimize the compressed data, including but not limited to adding checksums and subpackaging.

[0014] Preferably, the algorithm CPU provides an intelligent decision support mechanism, which verifies whether the priority variables of the data are allowed to be constructed based on the fused data through a priority SAT algorithm to meet the limited forwarding capacity of the data under dense sorting conditions.

[0015] Preferably, the algorithm CPU provides a data transmission method based on Beidou short message, and the data transmission method based on Beidou short message includes:

[0016] Data subpackaging and encoding: The data to be transmitted is subpacked, and each packet of data does not exceed the maximum length limit of a single transmission; each data packet is encoded in ASCII code, and an identification code and function code are added to each data packet to distinguish different types of data;

[0017] Packet loss detection and retransmission mechanism: At the sending end, after each data packet is sent, wait for the ACK confirmation packet from the receiving end. If the ACK confirmation packet is not received, resend the data packet; at the receiving end, sort the received data packets according to their IDs and send an ACK confirmation after receiving the last data packet;

[0018] Customized protocol design: Customized protocol stack, including frame header, data segment and check segment. The frame header is used to identify the data type and length, the data segment is used to carry the actual data, and the check segment is used to check the data integrity. At the sending end, the data packet is encapsulated according to the customized protocol and sent to the receiving end through the Beidou short message DDTCQ. At the receiving end, the received BDTCI data packet is decapsulated and the data integrity is checked according to the check segment. If an error is found, a retransmission is requested.

[0019] Compression and optimization: For data that exceeds the single transmission length limit, a compression algorithm is used to reduce the data length; during the transmission process, the data packet size and transmission frequency are dynamically adjusted according to actual needs.

[0020] Preferably, the data processing unit comprises:

[0021] Data collection module: used to collect, extract and store data from various data sources and support concurrent and distributed collection, including data source, collector, parser and transmission module;

[0022] Data classification module: classifies and labels data according to its characteristics and requirements, and is used to implement data classification, data permission management, and machine learning, maintain data security classification, and ensure that page access and operation permissions match the role management function of the security center;

[0023] Data integration module: Integrate data from different data sources to form a unified data set and share data across multiple transmission channels;

[0024] Data cleaning module: removes invalid, duplicate or erroneous data, detects and processes outliers in the data;

[0025] Data parsing module: used to receive AIS information and Beidou terminal data, parse the AIS information and Beidou messages to obtain the information of the own ship and other ships, and send the information of the own ship and other ships to the data redundancy processing module;

[0026] Data redundancy processing module: used to save the received own ship information and other ship information, and use the Beidou satellite interface to communicate with the signal redundancy processing module of the AIS server through the Beidou system to confirm whether the other ship information is already in the AIS server. If so, only the own ship information is sent to the data compression module; if not, the own ship information and other ship information are sent to the data compression module;

[0027] Data compression module: when only the information of own ship is received, the information of own ship is sent to AIS server through Beidou system by using Beidou satellite interface; when the information of own ship and other ships is received, the absolute longitude and latitude of dynamic data of other ships' information is converted into relative longitude and latitude relative to own ship, and the information of own ship and other ships is sent to AIS server through Beidou system by using Beidou satellite interface;

[0028] Data storage module: Stores the processed data in a database or data warehouse, and improves data availability and fault tolerance by sharding the data and replicating it on different nodes, and supports fast read and write operations to meet the system's needs for real-time data processing.

[0029] Preferably, the signal processing unit comprises:

[0030] Signal acquisition module: used to receive device transmission signals, establish signal channels, obtain own ship information and other ship information, and send own ship information and other ship information to the signal decompression module;

[0031] Signal decompression module: used to compile the relative longitude and latitude of other ship information into absolute longitude and latitude, and update the ship information and other ship information into the signal storage module;

[0032] Signal redundancy processing module: used to compare other ship information in the signal storage module with other ship information sent by the data redundancy processing module and then communicate with the data redundancy processing module;

[0033] Signal storage module: a device or system used to store and manage signal data, including but not limited to signal acquisition, processing, storage and playback. The signal storage module can realize real-time acquisition, processing and storage of 64-channel sensor signals and store the data on the hard disk.

[0034] Preferably, the main panel is connected to a power management module for implementing power management and monitoring and a UPS power system for ensuring continuous power supply.

[0035] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0036] The present invention has real-time and reliability:

[0037] Through multi-mode communication and integrated communication methods, the data communication capability of shipborne equipment has been effectively improved. By integrating multiple communication modes, such as AIS radio equipment, mobile communication network, VHF communication, Beidou communication, marine broadband, etc., the equipment can trigger the connection of various transmission channels in different environments, greatly improving the flexibility, real-time and reliability of data transmission.

[0038] The present invention can improve communication efficiency and signal quality:

[0039] By implementing the converged service of private network and public network through the converged gateway, the indoor communication signal quality can be improved and the network construction cost can be reduced. This converged solution can provide multiple value-added services (such as three-party calling, call holding, call transfer, etc.) while keeping the voice, data and number unchanged, and support multiple operator frequency bands, thereby reducing the total construction cost.

[0040] The present invention is intelligent and adaptive:

[0041] By introducing artificial AI algorithm technology to achieve network resource management and scheduling, the flexibility and adaptability of the network are improved, which enables the network to better respond to different communication needs and environmental changes.

[0042] The present invention can improve communication efficiency and realize multiple transmission paths:

[0043] It integrates multiple communication methods and connects them through standardized interfaces, so that each module can be flexibly combined and replaced, and the equipment can be flexibly configured and upgraded according to actual needs. The integration and dynamic switching technology of multi-mode heterogeneous wireless networks can dynamically switch between multiple communication networks according to communication requirements, thereby meeting the communication needs of different terminal devices at the same time, realizing multi-channel transmission of data, and ensuring the efficiency and timeliness of data communication.

[0044] The present invention can realize transmission data compression through compression algorithm:

[0045] The self-developed compression algorithm AB24 is adopted to improve the efficiency of data storage and transmission and realize the compression of data size. The algorithm is based on LZMA and combines dictionary method and predictive coding technology to achieve efficient lossless compression; by identifying repeated phrases in the input stream and referencing these phrases with pointers to reduce data redundancy, the size of the ocean broadband occupied by the transmitted data is reduced, and the ocean broadband traffic fee is reduced, which truly saves costs for fishermen.

[0046] The present invention has high data transmission security:

[0047] The AIS equipment system data is verified and fault-tolerant, and its data verification mainly relies on the CRC (cyclic redundancy check) mechanism. The AIS data packet uses an 8-bit CRC check code, and the upper and lower four bits of the check code are converted into hexadecimal numbers to form the check code. Combined with static information and dynamic information matching check and abnormal point data detection, it can reduce anomalies in the database. Fault-tolerant mechanism to avoid the failure of the entire data packet.

[0048] The BeiDou system uses BCH (15, 11, 1) code plus interleaving to achieve error correction. The BCH code length is 15 bits, the information bit is 11 bits, and the error correction capability is 1 bit. The navigation message data code is grouped in 11-bit order, first serial / parallel conversion is performed, and then BCH code error correction coding is performed. Every two groups of BCH codes are then converted in 1-bit order to form an interleaved code with a code length of 30 bits.

[0049] Beidou short message communication also uses XOR verification to perform XOR operations on the 8 bits of all characters in the sentence (excluding the start and end bits) to ensure the accuracy of data transmission. The data verification and error correction mechanism can ensure that errors are discovered and corrected in a timely manner during data transmission, thereby improving data accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a principle block diagram of a new generation AIS and multi-mode communication fusion terminal of the present invention;

[0051] Figure 2 It is the main flow chart of the present invention;

[0052] Figure 3 is a flow chart of the initialization process of the present invention;

[0053] Figure 4 It is a flow chart of the monitoring operation process of the present invention. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] An emergency communication system based on a new generation of AIS and multi-mode communication fusion terminal, including a new generation of AIS and multi-mode communication fusion terminal and an AIS system, Beidou system, marine broadband system and VHF system connected to the new generation of AIS and multi-mode communication fusion terminal. It is based on mobile communication technology, shipborne AIS technology, shipborne very high frequency intercom technology, shipborne Beidou positioning, marine broadband technology, message technology, etc., which integrates multi-terminal communications to achieve integrated communication of shipborne equipment, thereby providing efficient and reliable communication solutions for the maritime safety of ships and crew members, meeting the establishment of a marine multi-data transmission channel mode, and expanding the exchange capacity of important information such as ship position data, environmental data, maritime targets and fishing vessel data between ships. Figure 1 As shown, the new generation AIS and multi-mode communication fusion terminal includes a main panel and a radio frequency module connected to the main panel, a power management module, a UPS power system, a signal amplifier, a display screen, a speaker and a fusion communication processing module.

[0056] The RF module is used to achieve network access for users. The RF module has the ability to establish an independent mobile communication and WIFI network, and can provide mobile communication coverage with weak signals indoors, outdoors, and in marginal areas of the cabin. They can be connected to the router board through the network. The specific functions are as follows:

[0057] (1) Mobile communication signal reception and demodulation: The RF module can receive wireless signals and convert them into digital signals for subsequent processing and analysis.

[0058] (2) The RF module can also demodulate and decode the signal to restore the original data.

[0059] (3) WIFI signal transmission and modulation: The RF module can also convert digital signals into wireless signals and send them out through the antenna. In addition, the RF module can also modulate and encode the signal to improve the transmission efficiency and reliability of the signal.

[0060] The fusion communication processing module is used to connect with various shipborne equipment to realize multi-mode communication, including algorithm CPU, ARM processor, protocol conversion baseboard, AIS signal interface, Beidou satellite interface, maritime broadband interface, VHF equipment interface and communication network interface, among which, the algorithm CPU is connected to the main panel, and the algorithm CPU is used to realize the security, reliability and compression of the emergency communication system receiving and sending data through the fusion communication processing module; the ARM processor is connected to the algorithm CPU, and the ARM processor is used to realize data processing and signal processing; the protocol conversion baseboard is connected to the ARM processor, and the protocol conversion baseboard is a serial communication conversion module used to realize the interconnection between different communication protocols; the AIS signal interface, Beidou satellite interface, maritime broadband interface, VHF equipment interface and communication network interface are respectively connected to the protocol conversion baseboard, the AIS signal interface is used to connect to the AIS system, the Beidou satellite interface is used to connect to the Beidou system, the maritime broadband interface is used to connect to the maritime broadband system, the VHF equipment interface is used to connect to the VHF system, and the communication network interface is used to connect to the communication network.

[0061] The algorithm CPU can provide data verification and error correction mechanism for the AIS system, data verification and error correction mechanism for the Beidou system, self-developed compression algorithm AB24, intelligent decision support mechanism and data transmission method based on Beidou short message, which are described in detail below:

[0062] 1. The data verification and error correction mechanism of the AIS system includes the CRC (cyclic redundancy check) mechanism, static information and dynamic information matching verification, abnormal point data detection and fault tolerance mechanism, as follows:

[0063] (1) CRC (Cyclic Redundancy Check) mechanism

[0064] Checksum generation: AIS data packets use an 8-bit CRC checksum. The process of generating the checksum involves calculating an 8-bit remainder from the data in the data packet through polynomial division. This remainder is the CRC checksum.

[0065] Verification code format: Convert the upper four bits and lower four bits of the 8-bit CRC verification code into hexadecimal numbers to form the final verification code.

[0066] Verification process: After receiving the data packet, the receiving end recalculates the CRC check code and compares it with the received check code. If they are consistent, the data is considered correct; if they are inconsistent, it is considered that an error occurred during the data transmission process.

[0067] (2) Matching and verification of static and dynamic information

[0068] Static information: including MMSI (Maritime Mobile Service Identity), ship name, captain, ship width and other fixed information.

[0069] Dynamic information: including real-time changing information such as ship position, speed, and heading.

[0070] Matching verification: By comparing the consistency of static information and dynamic information, the correctness of the data is further verified. For example, if the MMSI in a ship position report does not match the known static information, it may indicate that the data is wrong.

[0071] (3) Abnormal data detection

[0072] Anomaly detection: Detect anomalies in the data through statistical analysis and threshold judgment. For example, if the speed in a ship position report is much higher than the normal range, it may indicate data errors.

[0073] Data cleaning: Mark or delete detected abnormal data to prevent it from affecting the accuracy and reliability of the database.

[0074] (4) Fault-Tolerant Mechanism

[0075] Data redundancy: Redundant information is introduced during the data transmission process. Even if part of the data is lost or damaged, the original data can be restored through the redundant information.

[0076] Retransmission mechanism: If a data error is detected, the sender can be requested to resend the data packet to ensure data integrity.

[0077] 2. The data verification and error correction mechanism of the BeiDou system includes BCH code encoding, interleaving mode, XOR check and check code verification, as follows:

[0078] (1) BCH code encoding, the process is as follows:

[0079] Grouping: The navigation message data codes are grouped in order of 11 bits each.

[0080] Serial / parallel conversion: Convert each group of 11 bits of data into serial / parallel data in preparation for BCH encoding.

[0081] BCH coding: Use BCH (15, 11, 1) code for error correction coding to generate 15 bits of coded data, of which 4 bits are redundant check bits.

[0082] Parallel / serial conversion: Every two groups of BCH codes (30 bits in total) are converted into parallel / serial codes in 1-bit sequence to form an interleaved code with a code length of 30 bits.

[0083] Error correction capability: BCH (15,11,1) code can correct 1-bit errors to ensure data accuracy.

[0084] (2) Interleaving method

[0085] Purpose of interleaving: To disperse continuous errors through interleaving and improve error correction capability.

[0086] Interleaving process: Every two groups of BCH codes are converted into parallel / serial in 1-bit order to form a 30-bit interleaved code. In this way, even if continuous errors occur during transmission, they can be corrected by the interleaved BCH code.

[0087] (3) XOR check

[0088] Verification process: Perform an XOR operation on the 8 bits of all characters in the sentence (excluding the start and end bits) to generate a verification code.

[0089] (4) Checksum verification: After receiving the data, the receiver recalculates the XOR checksum and compares it with the received checksum. If they are consistent, the data is considered correct; if they are inconsistent, it is considered that an error occurred during the data transmission process.

[0090] 3. Self-developed compression algorithm AB24

[0091] In the data transmission of marine fishery informationization, when the fishing boat leaves the coastline and exceeds the coverage of the communication network, it can only use marine broadband for data transmission. The traffic cost of marine broadband is expensive, so it is very valuable to reduce the traffic usage for transmission compression. The self-developed compression algorithm AB24 can improve the efficiency of data storage and transmission, and compress the data size. The algorithm is based on LZMA, combining the dictionary coding technology of the LZ77 algorithm and the statistical characteristics of the Markov model. Its implementation method uses a sliding window and a hash table to find repeated string segments, and replaces the repeated parts with pointers. The Markov chain model is used for probability estimation to optimize the coding efficiency. Binary arithmetic coding or range coding is usually used to achieve efficient probability coding. The specific method is as follows: preliminary processing of the input data, such as block segmentation, filtering, etc.; finding the longest matching string in the sliding window, and using pointers and lengths to represent the matching string; using the Markov model to estimate the probability of each symbol, encoding according to the probability estimation results, and generating compressed data; further optimization of the compressed data, such as adding checksums and subpackaging.

[0092] The self-developed compression algorithm AB24 has the characteristics of high compression ratio, fast decompression speed and strong adaptability. Compared with other compression algorithms, LZMA can achieve a higher compression ratio. Although the compression speed is slow, the decompression speed is relatively fast. It is suitable for various types of data, such as text, images, audio, etc.

[0093] At the same time, the self-developed compression algorithm AB24 first uses sliding window technology to identify repeated AIS Beidou data and replaces it with an index, and encodes the remaining data through arithmetic coding to ensure that the compressed data can restore the original content without losing information. This method that combines dictionary methods and probability predictions not only improves compression efficiency, but also reduces compression latency, and is particularly suitable for real-time data processing and big data storage.

[0094] 4. Intelligent Decision-making Support Mechanism

[0095] Based on the fused data, the priority SAT algorithm is used to verify whether the priority variables of the data are allowed to be constructed to meet the limited data forwarding capacity in the case of dense sorting. This method is particularly useful in dealing with situations where the utilization rate needs to be maximized, because it can optimize resource allocation by adjusting the priority variables and establish the sending of ship data to a unified platform to improve the safety and efficiency of maritime traffic.

[0096] 5. The data transmission method based on Beidou short message can improve the efficiency and reliability of data transmission, as follows:

[0097] (1) Data packetization and encoding: According to the Beidou short message civil protocol, the data length that can be transmitted at a time is defined, and the data to be transmitted is packetized. Each packet of data does not exceed the maximum length limit of a single transmission. Each data packet is encoded in ASCII code, and an identification code and function code are added to each data packet to distinguish different types of data.

[0098] (2) Packet loss detection and retransmission mechanism: At the sending end, after each data packet is sent, it waits for the ACK confirmation packet from the receiving end. If the ACK confirmation packet is not received, the data packet is resent. At the receiving end, the received data packets are sorted according to their IDs and an ACK confirmation is sent after the last data packet is received.

[0099] (3) Customized protocol design: Customized protocol stack, including frame header, data segment and check segment. The frame header is used to identify the data type and length, the data segment is used to carry the actual data, and the check segment is used to check the data integrity. At the sending end, the data packet is encapsulated according to the custom protocol and sent to the receiving end via the Beidou short message DDTCQ. At the receiving end, the received BDTCI data packet is decapsulated and the data integrity is checked according to the check segment. If an error is found, a retransmission is requested. Telegram format: as shown in Table A.1 and Table A.2.

[0100] (4) Compression and optimization: For data that exceeds the single transmission length limit, a compression algorithm is used to reduce the data length and improve transmission efficiency. During the transmission process, the data packet size and transmission frequency are dynamically adjusted according to actual needs to adapt to different application scenarios. Specifically, the self-developed compression algorithm AB24 can be used to compress the communication content.

[0101] Table A.1 Position report field definitions

[0102]

[0103]

[0104] Table A.2 Location data field definitions

[0105]

[0106] The ARM processor includes a data processing unit and a signal processing unit, wherein the data processing unit is used to implement data processing; the signal processing unit is used to implement signal processing. The details are as follows:

[0107] The data processing unit includes a data acquisition module, a data classification module, a data integration module, a data cleaning module, a data analysis module, a data redundancy processing module, a data compression module and a data storage module. The following is a detailed description of each of the above modules:

[0108] Data acquisition module: The data acquisition module is an indispensable part of the converged communication processing module. Its main functions include collecting, extracting and storing data from various data sources. The data acquisition module consists of data source, collector, parser and transmission module. It can obtain data from multiple data sources periodically or in real time, and supports concurrent and distributed acquisition to improve efficiency and fault tolerance.

[0109] Data classification module: classifies and labels data according to its characteristics and requirements to facilitate subsequent data analysis and application. Its functions include data classification, data permission management, and machine learning. It maintains the security classification of data and ensures that page access and operation permissions match the role management function of the security center.

[0110] Data integration module: Integrate data from different data sources to form a unified data set and share data across multiple transmission channels.

[0111] Data cleaning module: removes invalid, duplicate or erroneous data, detects and processes outliers in the data, such as using statistical methods (such as box plots) or business logic-based methods to standardize data according to a unified standard protocol for communication between different types of devices, ensuring data consistency and processability, and ensuring data accuracy and reliability.

[0112] Data parsing module: used to receive AIS information and Beidou terminal data, parse the AIS information and Beidou messages to obtain the information of the own ship and other ships, and send the information of the own ship and other ships to the data redundancy processing module.

[0113] Data redundancy processing module: used to save the received own ship information and other ship information, and use the Beidou satellite interface to communicate with the signal redundancy processing module of the AIS server through the Beidou system to confirm whether the other ship information is already in the AIS server. If so, only the own ship information is sent to the data compression module. If not, the own ship information and other ship information are sent to the data compression module.

[0114] Data compression module: when only the information of own ship is received, the information of own ship is sent to AIS server through Beidou system by using Beidou satellite interface; when the information of own ship and other ships is received, the absolute longitude and latitude of dynamic data of other ships' information is converted into relative longitude and latitude relative to own ship, and the information of own ship and other ships is sent to AIS server through Beidou system by using Beidou satellite interface.

[0115] Data storage module: Stores processed data in a database or data warehouse for subsequent query and analysis. By sharding the data and replicating it on different nodes, it improves data availability and fault tolerance, supports fast read and write operations, and meets the needs of real-time data processing in the system.

[0116] The signal processing unit includes a signal acquisition module, a signal decompression module, a signal redundancy processing module and a signal storage module. The following is a detailed description of each of the above modules:

[0117] Signal acquisition module: used to receive device transmission signals, establish signal channels, obtain own ship information and other ship information, and send own ship information and other ship information to the signal decompression module.

[0118] Signal decompression module: used to compile the relative longitude and latitude of other ship information into absolute longitude and latitude, and update the ship information and other ship information into the signal storage module.

[0119] Signal redundancy processing module: used to compare other ship information in the signal storage module with other ship information sent by the data redundancy processing module and then communicate with the data redundancy processing module.

[0120] Signal storage module: a device or system used to store and manage signal data, including signal acquisition, processing, storage and playback, etc. The signal storage module can realize real-time acquisition, processing and storage of 64-channel sensor signals and store the data on the hard disk.

[0121] The main panel can be an Intel-J4125 core board, which integrates the Celeron series J4125 quad-core quad-thread processor; 1*SODIMM memory slot, supporting DDR42400 memory, up to 8GB; onboard audio decoding controller; SATA3.0 hard disk interface, SATA reduces the number of pins, reduces the number of connecting cables, and is more efficient, with a data transfer rate of up to 150MB / s; 4*USB3.1, the watchdog system can monitor the system status, provide program run-away monitoring, and effectively prevent system crashes. For crashes caused by software and hardware, hardware resets can be performed to restart the system; the HDMI interface is a fully digital video and sound transmission interface that can send audio and video signals at the same time; USART-TTL full-duplex universal synchronous / asynchronous serial transceiver interface, which is a highly flexible serial communication device that can communicate in full-duplex, has an independent high-precision baud rate generator, does not occupy the system timer counter, supports hardware parity check, data overflow detection, frame error detection, and integrates noise filter and digital low-pass filter functions; in addition, it also integrates 100M Ethernet card, PCIe interface, etc.

[0122] The power management module is mainly used to manage and monitor the power supply of the system to ensure the stability and reliability of the system. It is responsible for supplying and distributing the power supply of the system, and ensures the stability and safety of the system power supply by controlling the power switch, regulation and overload protection. The details are as follows:

[0123] (1) Battery management: Manage and monitor the emergency power supply of the emergency communication gateway, and ensure the reliability and durability of the emergency power supply by controlling the battery status, charging, and discharging.

[0124] (2) Fault detection and alarm: Responsible for monitoring and detecting the power status of the system, such as battery power, power switch status, voltage and current, etc. Once an abnormal situation occurs, an alarm will be issued in time to facilitate repair and maintenance.

[0125] (3) Automatic switching function: In emergency communication scenarios, when the system main power supply fails, the power management module can automatically switch to the backup power supply to ensure the reliability and stability of the system.

[0126] The UPS power system is an interactive UPS power module, also known as an online UPS power module, which is a higher-level UPS power module. It isolates the power supply from the load, and the power board provides power to the load. When the grid power is interrupted, the interactive UPS power module immediately switches the load to the battery pack and provides high-quality DC power to the load through the inverter to ensure continuous power supply to the load.

[0127] A signal amplifier is an electronic device used to increase the amplitude, current or power of a signal; it is used to increase the signal strength of a receiving antenna or a transmitting antenna. Using a signal amplifier can enhance the signal strength of the antenna, thereby improving the reliability and coverage of communications.

[0128] The display screen and the speaker are connected to the main panel via HDMI interfaces respectively, wherein the display screen is used to realize data display; and the speaker is used to realize voice broadcast.

[0129] like Figure 2 As shown, the main working process of the present invention consists of an initialization process and a monitoring operation process.

[0130] like Figure 3 As shown in the figure, the initialization process is used to initialize various external devices, including setting parameters, configuring working mode, testing connection, testing network, platform connection, etc. The details are as follows:

[0131] VHF initialization process: First initialize the main working frequency of the device, then set the bandwidth and select the working channel. Set sub-audio encryption as needed. Next, set the amplification factor of the RF amplifier and adjust the transmission power.

[0132] AIS initialization process: supports setting parameters such as baud rate, parity bit, stop bit, hardware flow control, etc., sends AIS test command, and AIS returns the correct response information, then the initialization is completed.

[0133] Beidou system initialization: obtain the current longitude and latitude coordinates through satellite positioning, and then send a short message to the satellite terminal. After the Beidou satellite receives the information, it forwards it to the central control system. Then, the central control system forwards the reply message to the Beidou receiving end of the device through the Beidou satellite to notify the ground central control system, the device startup information, and the Beidou communication system channel test. The Beidou system covers almost the entire world, so the device should be able to receive the correct reply information to ensure that the emergency short message can be quickly sent in an emergency, including distress conditions and longitude and latitude information.

[0134] Marine broadband initialization: Initialize the marine broadband interface of the device, enter the IP address and mask provided by the marine broadband service provider, and enter the correct gateway and DNS server address. Connect to the central control system server. After the connection is successful, send the device startup information, etc. After the central control system returns the correct information, disconnect the marine broadband connection, release the occupied communication channel, and the initialization is completed.

[0135] like Figure 4As shown in the figure, the monitoring operation process consists of five main threads: real-time communication display thread, one-key alarm thread, AIS information detection thread, Beidou data scheduling thread, and marine broadband transmission thread. In addition, it also includes a VHF radio frequency scheduling thread, and uses a multi-tasking system, with each thread running simultaneously. The details are as follows:

[0136] Real-time communication display process: Real-time collection of VHF communication, including parameters such as storage time, data information, automatic compression, and expiration deletion. Real-time monitoring of the signal sent by the AIS end, and transmission through the wireless transmission channel, and save information related to the status change, fishing boat position content, warning time, etc. Due to the cost of the Beidou system, it cannot be connected in real time and occupies the channel. Therefore, it is necessary to connect to the Beidou system regularly to query data information, messages, etc. Among them, the query frequency can be set according to actual needs. Regular access to the marine broadband system, connect to the central control system server, and transmit data. Decode the accessed VHF data, decode the data information sent by the marine broadband and Beidou communication, and display it on the display screen and speakers through the HDMI interface.

[0137] One-key alarm thread: Through the new generation of AIS and multi-mode communication fusion terminal, the communication channels of the navigation equipment on the ship are integrated, and the data transmission status of other equipment is detected in real time. When the data information is sent to the new generation of AIS and multi-mode communication fusion terminal, the fusion communication processing module is used to process and execute the data transmission operations of multiple channels at the same time. VHF directly plays the signal and transmits it through the VHF radio frequency signal. Send instructions to AIS, and AIS sends data signals to the fishery administration platform through its own channel. Dispatch the Beidou satellite interface, connect to the Beidou communication satellite, and send the data information content through the Beidou system to the Beidou command machine, and finally transmit it to the remote control platform. Dispatch the maritime broadband interface, connect to the on-net maritime broadband, connect to the central control system server, and send data transmission information.

[0138] AIS information detection thread: real-time monitoring of the AIS signal interface. If data information sent by AIS is received, the data content will be classified and processed. According to the actual scenario, if the AIS transmission is abnormal, the data will be sent to the marine broadband communication method synchronously, and the data will be processed and converted according to the communication protocol. Multi-channel transmission will be carried out to avoid data interruption when the AIS equipment cannot connect to the land base station at sea.

[0139] VHF radio frequency scheduling thread: real-time monitoring of the VHF communication interface. When VHF communication is abnormal, the data content is classified and processed, and the data is synchronized to support Beidou, broadband communication and other methods. Data is processed and converted according to the communication protocol, and multi-channel transmission is carried out to ensure multi-channel data return.

[0140] Beidou data scheduling thread: By regularly connecting to the Beidou system, Beidou data information is identified. If the Beidou message data is sent abnormally, other channels are selected to transmit data as needed, with priority given to marine broadband transmission. Data is processed and converted according to the communication protocol, and the ship position data is sent to the remote control platform via broadband.

[0141] Marine broadband transmission thread: Marine broadband transmission improves the efficiency and reliability of marine data transmission through multi-threading technology, efficient transmission protocols and advanced communication equipment. Currently, if the marine broadband transmission is abnormal, the data will be transmitted via Beidou communication by default. If the ship is within 20 kilometers offshore and within the coverage of the 4G or 5G communication network, the data packet will be sent to the AIS system first, and the data will be processed and converted according to the communication protocol, and remote data interaction will be carried out through the AIS system.

[0142] When in use, the present invention adopts technologies such as navigation communication, mobile communication, wireless communication, and VHF communication, integrates existing shipborne multi-communication channels and data, expands multiple types of signals and application terminals, integrates new generation AIS, Beidou, and marine broadband functions, encrypts, compresses, and performs fault-tolerant coding processing on the transmission data, reduces data security and transmission energy consumption, and supports one-key triggering of multi-channel data transmission on board through a large screen in the monitoring room, a matching mobile terminal, or a mobile terminal device. When the user initiates data transmission through the shipborne device, the present invention will immediately start the transmission mechanism, and then send the information through any channel of the multi-mode communication fusion terminal. As long as the shore-based equipment receives a request for any communication method, it can complete the communication with the user. Each rescue method is fully utilized to avoid starting a single shipborne navigation device separately when an emergency occurs, or delaying the transmission of data due to a certain device not working properly, thereby improving the marine data communication capability, the efficiency and success rate of accident rescue. The present invention has broad application prospects in multiple fields such as ship navigation and safety, maritime rescue and emergency response, fishery management and resource protection, and port and waterway management.

[0143] It has the following advantages:

[0144] 1. Real-time and reliability

[0145] Through multi-mode communication and integrated communication methods, the data communication capability of shipborne equipment has been effectively improved. By integrating multiple communication modes, such as AIS radio equipment, mobile communication network, VHF communication, Beidou communication, marine broadband, etc., the equipment can trigger the connection of various transmission channels in different environments, greatly improving the flexibility, real-time and reliability of data transmission.

[0146] 2. Improve communication efficiency and signal quality

[0147] By implementing the converged service of private network and public network through the converged gateway, the indoor communication signal quality can be improved and the network construction cost can be reduced. This converged solution can provide multiple value-added services (such as three-party calling, call holding, call transfer, etc.) while keeping the voice, data and number unchanged, and support multiple operator frequency bands, thereby reducing the total construction cost.

[0148] 3. Intelligence and Adaptability

[0149] By introducing artificial AI algorithm technology to achieve network resource management and scheduling, the flexibility and adaptability of the network are improved, which enables the network to better respond to different communication needs and environmental changes.

[0150] 4. Improve communication efficiency and realize multiple transmission channels

[0151] It integrates multiple communication methods and connects them through standardized interfaces, so that each module can be flexibly combined and replaced, and the equipment can be flexibly configured and upgraded according to actual needs. The integration and dynamic switching technology of multi-mode heterogeneous wireless networks can dynamically switch between multiple communication networks according to communication requirements, thereby meeting the communication needs of different terminal devices at the same time, realizing multi-channel transmission of data, and ensuring the efficiency and timeliness of data communication.

[0152] 5. Reducing Transmission Data Through Compression Algorithms

[0153] The self-developed compression algorithm AB24 is adopted to improve the efficiency of data storage and transmission and realize the compression of data size. The algorithm is based on LZMA and combines dictionary method and predictive coding technology to achieve efficient lossless compression; by identifying repeated phrases in the input stream and referencing these phrases with pointers to reduce data redundancy, the size of the ocean broadband occupied by the transmitted data is reduced, and the ocean broadband traffic fee is reduced, which truly saves costs for fishermen.

[0154] 6. High security of data transmission

[0155] The AIS equipment system data is verified and fault-tolerant, and its data verification mainly relies on the CRC (cyclic redundancy check) mechanism. The AIS data packet uses an 8-bit CRC check code, and the upper and lower four bits of the check code are converted into hexadecimal numbers to form the check code. Combined with static information and dynamic information matching check and abnormal point data detection, it can reduce anomalies in the database. Fault-tolerant mechanism to avoid the failure of the entire data packet.

[0156] The BeiDou system uses BCH (15, 11, 1) code plus interleaving to achieve error correction. The BCH code length is 15 bits, the information bit is 11 bits, and the error correction capability is 1 bit. The navigation message data code is grouped in 11-bit order, first serial / parallel conversion is performed, and then BCH code error correction coding is performed. Every two groups of BCH codes are then converted in 1-bit order to form an interleaved code with a code length of 30 bits.

[0157] Beidou short message communication also uses XOR verification to perform XOR operations on the 8 bits of all characters in the sentence (excluding the start and end bits) to ensure the accuracy of data transmission. The data verification and error correction mechanism can ensure that errors are discovered and corrected in a timely manner during data transmission, thereby improving data accuracy and reliability.

Claims

1. An emergency communication system based on a new generation AIS and multi-mode communication fusion terminal, characterized by: It includes a new generation AIS and multi-mode communication fusion terminal and an AIS system, a Beidou system, a maritime broadband system and a VHF system connected to the new generation AIS and multi-mode communication fusion terminal; the new generation AIS and multi-mode communication fusion terminal includes a main panel, the main panel is connected with a radio frequency module for realizing mobile communication and WIFI network coverage of ships and surrounding weak signal areas, a fusion communication processing module for connecting various shipborne equipment to realize multi-mode communication, a display screen for realizing data display and a speaker for realizing voice broadcasting; The fusion communication processing module includes an algorithm CPU connected to the main panel, an ARM processor connected to the algorithm CPU, a protocol conversion baseboard connected to the ARM processor, and an AIS signal interface connected to the protocol conversion baseboard for connecting to the AIS system, a Beidou satellite interface of the Beidou system, a maritime broadband interface of the maritime broadband system, a VHF device interface of the VHF system, and a communication network interface of the communication network; The protocol conversion baseboard is a serial communication conversion module used to achieve interconnection between different communication protocols; The ARM processor includes a data processing unit for implementing data processing and a signal processing unit for implementing signal processing; The algorithm CPU is used to realize the security, reliability and compression of data received and sent by the emergency communication system through the fusion communication processing module.

2. According to claim 1, an emergency communication system based on a new generation AIS and multi-mode communication fusion terminal is characterized in that: The algorithm CPU provides a data verification and error correction mechanism for the AIS system, which includes a cyclic redundancy check mechanism, static information and dynamic information matching check, abnormal point data detection and fault tolerance mechanism.

3. According to claim 1, an emergency communication system based on a new generation AIS and multi-mode communication fusion terminal is characterized in that: The algorithm CPU provides the data verification and error correction mechanism of the Beidou system, which includes BCH code encoding, interleaving mode, XOR check and check code verification.

4. According to claim 1, an emergency communication system based on a new generation AIS and multi-mode communication fusion terminal is characterized in that: The algorithm CPU provides a self-developed compression algorithm AB24, which combines the dictionary coding technology of the LZ77 algorithm and the statistical characteristics of the Markov model, uses a sliding window and a hash table to find repeated string segments, and replaces the repeated parts with pointers, uses the Markov chain model for probability estimation, optimizes coding efficiency, and usually uses binary arithmetic coding or range coding to achieve efficient probability coding; the specific method is as follows: perform preliminary processing on the input data, including but not limited to blocking and filtering; search for the longest matching string in the sliding window, and represent the matching string with a pointer and length; use the Markov model to estimate the probability of each symbol appearing, encode according to the probability estimation result, and generate compressed data; further optimize the compressed data, including but not limited to adding checksums and packetization.

5. According to claim 1, an emergency communication system based on a new generation AIS and multi-mode communication fusion terminal is characterized in that: The algorithm CPU provides an intelligent decision support mechanism. The intelligent decision support mechanism is based on the fused data and verifies whether the priority variables of the data are allowed to be constructed through the priority SAT algorithm to meet the limited forwarding capacity of data in the case of dense sorting.

6. According to claim 1, an emergency communication system based on a new generation AIS and multi-mode communication fusion terminal is characterized in that: The algorithm CPU provides a data transmission method based on Beidou short message, and the data transmission method based on Beidou short message includes: Data subpackaging and encoding: The data to be transmitted is subpacked, and each packet of data does not exceed the maximum length limit of a single transmission; each data packet is encoded in ASCII code, and an identification code and function code are added to each data packet to distinguish different types of data; Packet loss detection and retransmission mechanism: At the sending end, after each data packet is sent, wait for the ACK confirmation packet from the receiving end. If the ACK confirmation packet is not received, resend the data packet; at the receiving end, sort the received data packets according to their IDs and send an ACK confirmation after receiving the last data packet; Customized protocol design: Customized protocol stack, including frame header, data segment and check segment. The frame header is used to identify the data type and length, the data segment is used to carry the actual data, and the check segment is used to check the data integrity. At the sending end, the data packet is encapsulated according to the customized protocol and sent to the receiving end through the Beidou short message DDTCQ. At the receiving end, the received BDTCI data packet is decapsulated and the data integrity is checked according to the check segment. If an error is found, a retransmission is requested. Compression and optimization: For data that exceeds the single transmission length limit, a compression algorithm is used to reduce the data length; during the transmission process, the data packet size and transmission frequency are dynamically adjusted according to actual needs.

7. According to claim 1, an emergency communication system based on a new generation AIS and multi-mode communication fusion terminal is characterized in that: The data processing unit comprises: Data collection module: used to collect, extract and store data from various data sources and support concurrent and distributed collection, including data source, collector, parser and transmission module; Data classification module: classifies and labels data according to its characteristics and requirements, and is used to implement data classification, data permission management, and machine learning, maintain data security classification, and ensure that page access and operation permissions match the role management function of the security center; Data integration module: Integrate data from different data sources to form a unified data set and share data across multiple transmission channels; Data cleaning module: removes invalid, duplicate or erroneous data, detects and processes outliers in the data; Data parsing module: used to receive AIS information and Beidou terminal data, parse the AIS information and Beidou messages to obtain the information of the own ship and other ships, and send the information of the own ship and other ships to the data redundancy processing module; Data redundancy processing module: used to save the received own ship information and other ship information, and use the Beidou satellite interface to communicate with the signal redundancy processing module of the AIS server through the Beidou system to confirm whether the other ship information is already in the AIS server. If so, only the own ship information is sent to the data compression module; if not, the own ship information and other ship information are sent to the data compression module; Data compression module: when only the information of own ship is received, the information of own ship is sent to AIS server through Beidou system by using Beidou satellite interface; when the information of own ship and other ships is received, the absolute longitude and latitude of dynamic data of other ships' information is converted into relative longitude and latitude relative to own ship, and the information of own ship and other ships is sent to AIS server through Beidou system by using Beidou satellite interface; Data storage module: Stores the processed data in a database or data warehouse, and improves data availability and fault tolerance by sharding the data and replicating it on different nodes, and supports fast read and write operations to meet the system's needs for real-time data processing.

8. The emergency communication system based on the new generation AIS and multi-mode communication fusion terminal according to claim 7 is characterized in that: The signal processing unit comprises: Signal acquisition module: used to receive device transmission signals, establish signal channels, obtain own ship information and other ship information, and send own ship information and other ship information to the signal decompression module; Signal decompression module: used to compile the relative longitude and latitude of other ship information into absolute longitude and latitude, and update the ship information and other ship information into the signal storage module; Signal redundancy processing module: used to compare other ship information in the signal storage module with other ship information sent by the data redundancy processing module and then communicate with the data redundancy processing module; Signal storage module: a device or system used to store and manage signal data, including but not limited to signal acquisition, processing, storage and playback. The signal storage module can realize real-time acquisition, processing and storage of 64-channel sensor signals and store the data on the hard disk.

9. The emergency communication system based on the new generation AIS and multi-mode communication fusion terminal according to claim 1 is characterized in that: The main panel is connected to a power management module for realizing power management and monitoring and a UPS power system for ensuring continuous power supply.

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