Satellite communication application processing system suitable for sea surface buoy

Abstract

The invention belongs to the field of satellite relay communication, and particularly relates to a satellite communication application processing system suitable for a sea surface buoy, which comprises a data protocol processing module, a satellite network access module and a link switching module, the communication protocol conversion module is used for performing communication protocol conversion and processing on data between a sea surface buoy and a shore-based end; the satellite network access module is used for realizing an access function with a Tiantong satellite network, a relay satellite network and a Beidou satellite network; and the link switching module is used for evaluating the communication quality of a current link by collecting the signal intensity of a satellite in real time, and ensuring the real-time and reliable transmission of data through a satellite link autonomous switching method. Through the multi-link design and the intelligent switching algorithm, the continuity of data transmission and the self-adaption to the complex marine environment are ensured, and the problem of communication link reliability under the severe sea condition is effectively solved.

Description

Technical Field

[0001] The present invention belongs to the field of satellite relay communication, and particularly relates to a satellite communication application processing system suitable for sea surface buoys. Background Art

[0002] With the vigorous development of China's ocean observation cause, the amount of observation data in the deep and far sea areas has increased sharply. These increasing data have put forward higher requirements for data transmission between sea surface buoys and shore bases. At present, the data transmission between sea surface buoys and shore bases mainly relies on the American Iridium network, the Argos satellite network, and China's Beidou satellite network. The data transmission rate is lower than 10 kbps, making it difficult to meet the demand for high-speed data transmission. In 2021, China completed the construction of the Tiantong-1 satellite mobile communication network (hereinafter referred to as the "Tiantong satellite network"), with a maximum data transmission rate of up to 384 kbps, and it has been applied to China's maritime data relay service. However, the coverage area of the Tiantong-1 satellite (hereinafter referred to as the "Tiantong satellite") is limited, and some deep and far sea areas are still in the coverage blind area. At present, some solutions are to integrate the Tiantong satellite terminal and the Beidou satellite short message terminal into the same buoy, and perform satellite link switching by receiving control instructions from the shore base to make up for the deficiencies of a single terminal. However, this link switching method relying on shore base control instructions is prone to losing a large amount of data during the link switching process. In addition, when the buoy is outside the coverage range of the Tiantong satellite signal, using the Beidou short message network for data transmission, the rate is only 77 byte / min, still unable to meet the demand for high-speed data transmission. Therefore, there is an urgent need for a satellite communication application processing system suitable for sea surface buoys. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and propose a satellite communication application processing system suitable for sea surface buoys, which effectively improves the real-time performance and reliability of deep and far sea data transmission through accessing China's Tiantong satellite network, relay satellite network, Beidou satellite network, and autonomous link switching.

[0004] In view of this, the present invention discloses a satellite communication application processing system suitable for sea surface buoys, including: a data protocol processing module, a satellite network access module, and a link switching module, wherein,

[0005] The data protocol processing module is used to be responsible for the communication protocol conversion and processing of data between the sea surface buoy and the shore base end;

[0006] The satellite network access module is used to realize the access functions to the Tiantong satellite network, the relay satellite network, and the Beidou satellite network;

[0007] The link switching module is used to evaluate the communication quality of the current link by collecting the signal strength of the satellite in real time, and ensure the real-time and reliable transmission of data through the satellite link autonomous switching method.

[0008] Preferably, the data protocol processing module includes:

[0009] Receiving buoy data from the sea surface buoy, packetizing according to the currently required satellite network to be accessed, and sending it to the satellite network access module; parsing the protocol of the data received from the shore-based terminal by the satellite network access module, and forwarding it to the sea surface buoy after packetizing.

[0010] Preferably, when accessing the Tiantong satellite network, the processing process of the satellite network access module includes:

[0011] Sequentially executing the power-on instruction, the satellite signal strength detection instruction, and the network registration status query instruction;

[0012] When it is confirmed that the registration is successful, perform network environment configuration, sequentially set the packet data protocol environment, configure the identity authentication information and service quality parameters;

[0013] Configure the data channel, including clearing the existing channel data, setting the channel binding relationship, and configuring the port reporting parameters;

[0014] Initiate a dial-up connection to establish a two-way communication link between the sea surface buoy - Tiantong satellite - shore-based.

[0015] Preferably, when accessing the relay satellite network or the Beidou satellite network, the processing process of the satellite network access module includes:

[0016] Perform data sub-packaging and format conversion according to the data protocol specifications of the relay satellite or the Beidou satellite, and send it to the corresponding satellite. The communication unit of the satellite completes the data transmission work, and establishes a two-way communication link between the sea surface buoy - relay satellite / Beidou satellite - shore-based.

[0017] Preferably, the processing process of the link switching module includes repeating the following steps:

[0018] Step 1: Collect the signal strength data of the communication link in real time, calculate the average value of the signal strength, record the amplitude of the signal fluctuation and the fluctuation frequency of the signal;

[0019] Step 2: Evaluate the signal strength level and the channel stability of the collected signal characteristics;

[0020] Step 3: Adopt a dual evaluation factor decision mechanism, calculate the signal quality evaluation factor Q and the sea condition stability evaluation factor S respectively, and then obtain the comprehensive evaluation factor E through weighted calculation;

[0021] Step 4: Execute the corresponding switching strategy based on the value of the comprehensive evaluation factor E: When E is greater than or equal to 0.6, maintain the operation of the current communication link; when E is less than 0.6, trigger the link switching mechanism and select satellite access in the priority order of Tiantong satellite → relay satellite → Beidou short message.

[0022] Preferably, the channel stability evaluation in step 2 is determined by calculating the standard deviation σ.

[0023] Preferably, the signal quality evaluation factor Q in step 3 is graded according to the signal strength data RSSI, including:

[0024] When RSSI > -75, Q = 1.0; when -80 ≤ RSSI < -75, Q = 0.9; when -85 ≤ RSSI < -80, Q = 0.8; when -90 ≤ RSSI < -85, Q = 0.7; when -95 ≤ RSSI < -90, Q = 0.6; when RSSI < -95, Q = 0.2, where the unit of RSSI is dBm.

[0025] Preferably, the stability evaluation factor S in step 3 is graded according to the standard deviation σ, including:

[0026] When σ < 2, S = 1; when 2 ≤ σ < 4, S = 0.8; when 4 ≤ σ < 6, S = 0.6; when 6 ≤ σ < 8, S = 0.4; when 8 ≤ σ < 10, S = 0.2; when σ > 10, S = 0.

[0027] Preferably, the comprehensive evaluation factor E in step 3 satisfies the following formula:

[0028] E = 0.6Q + 0.4S.

[0029] Compared with the prior art, the advantages of the present invention are as follows:

[0030] Through the multi-link design (Tiantong satellite, relay satellite, Beidou short message) and the intelligent switching algorithm, the present invention ensures the continuity of data transmission and the adaptability to complex marine environments, effectively solving the problem of communication link reliability under harsh sea conditions. Description of the Drawings

[0031] Figure 1 is a schematic diagram of a satellite link;

[0032] Figure 2 is a block diagram of the composition of a satellite communication application processing system applicable to a sea surface buoy;

[0033] Figure 3 is a link switching flow chart. Detailed Embodiments

[0034] In view of the requirements for deep - sea and far - sea data transmission, the present invention proposes a satellite communication application processing system applicable to sea - surface buoys, mainly realizing functions such as data protocol processing, satellite network access, and autonomous link switching.

[0035] As a further improvement of the present invention, the application processing system can access China's Tiantong satellite network, relay satellite network, and Beidou short - message network. The Tiantong satellite network can meet the demand for high - speed data transmission. The relay satellite network expands the signal coverage ability in deep - sea and far - sea areas. The Beidou short - message network ensures communication reliability under severe sea conditions. This multi - network cooperation mechanism effectively solves the limitations in aspects such as data transmission rate, signal coverage ability, and reliability.

[0036] As a further improvement of the present invention, a method for autonomous satellite link switching is proposed, which includes four steps: signal feature acquisition process, channel evaluation process, link switching decision process, and link switching strategy execution. The application processing system collects the signal quality factor Q and the sea - condition stability evaluation factor S, and calculates the comprehensive evaluation factor E. When E is greater than or equal to 0.6, the current communication link is maintained; when E is less than 0.6, the link switching mechanism is triggered, and the standby link is selected in the priority order of "Tiantong satellite → relay satellite → Beidou short - message".

[0037] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0038] Embodiment

[0039] As Figure 1 shown, the embodiment of the present invention provides a satellite communication application processing system applicable to sea - surface buoys, which realizes two - way communication with the shore - based through accessing three satellite communication networks: Tiantong satellite network, relay satellite network, and Beidou satellite short - message network. Among them, the Tiantong satellite supports a maximum data transmission rate of 384 kbps, and its signal covers China's land, surrounding seas, the Indian Ocean, and the western Pacific region, being suitable for high - speed data transmission; the relay satellite supports a data transmission rate of 1 - 50 kbps, and its signal can cover the whole world, which can meet the data transmission requirements between buoys and shore - based outside the coverage of the Tiantong satellite; the Beidou short - message supports a maximum data transmission rate of 77 byte / min, which can meet the emergency data transmission requirements under severe sea conditions. Through the combined application of such multi - satellite links, the requirements for communication rate, coverage range, and reliability in deep - sea and far - sea data transmission can be met.

[0040] The functional block diagram of the application processing system is as Figure 2 shown. The application processing system mainly consists of functional modules such as data protocol processing, satellite network access, and link switching.

[0041] The data protocol processing module is mainly responsible for the conversion and processing of the data communication protocol between the buoy and the shore-based terminal. The data protocol processing module receives the observation data from the buoy, packets the data according to the currently required satellite network, and sends it to the satellite communication unit through the satellite access module. At the same time, it parses the protocol of the data from the satellite access module, packets the data, and forwards it to the buoy.

[0042] The satellite access module mainly realizes the access functions of the Tiantong satellite network, the relay satellite network, and the Beidou satellite network. When accessing the Tiantong satellite network, the satellite access module controls the Tiantong satellite communication unit by sending AT commands, and cooperates with the Tiantong satellite communication unit to complete functions such as network access and data transmission. Specifically, the satellite access module sequentially executes commands to send the power-on instruction, detect the satellite signal strength instruction, and query the network registration status instruction. After the satellite access module confirms successful registration, it configures the network environment, sequentially sets the PDP (Packet Data Protocol) environment, configures the identity authentication information and service quality parameters. After the network environment configuration is completed, the satellite access module then configures the data channel, including clearing the existing channel data, setting the channel binding relationship, and configuring the port reporting parameters, etc. Finally, it initiates a dial-up connection to establish a two-way communication link between the buoy - Tiantong satellite - shore-based terminal. When accessing the relay satellite and the Beidou satellite, the satellite access module performs data packet splitting and format conversion according to the data protocol specifications of the relay satellite and the Beidou short message. The processed data packets are respectively sent to the corresponding satellite communication units, and the satellite communication units complete the data transmission work to establish a two-way communication link between the buoy - relay satellite / Beidou satellite - shore-based terminal.

[0043] The link switching module evaluates the communication quality of the current link by real-time collecting the signal strength of the satellite, and ensures the real-time and reliable transmission of data through the satellite link autonomous switching method. The satellite link autonomous switching process is as Figure 3 shown. The specific implementation steps of the link switching are as follows.

[0044] Step 1: The application processing system real-time collects the signal strength (RSSI) data of the communication link. During this process, the application processing system calculates the average value of the signal strength, and also records the amplitude of the signal fluctuation (i.e., the difference between the maximum value and the minimum value), and the fluctuation frequency of the signal (measured by counting the number of times the signal strength fluctuates above and below the mean value) and stores them.

[0045] Step 2: The application processing system evaluates the acquired signal characteristics in two dimensions. First, it conducts a signal strength level evaluation to obtain the RSSI (Received Signal Strength Indicator) value, with the unit of dBm. Second, it conducts a channel stability evaluation to calculate the standard deviation σ. The standard deviation index can effectively reflect the current sea state. These two indicators will serve as the basic data for subsequent decisions, and the application processing system updates these evaluation results in real time to ensure that the changes in the channel state can be reflected in a timely manner.

[0046] Step 3: The application processing system adopts a dual-evaluation factor decision-making mechanism to calculate the signal quality evaluation factor Q and the sea state stability evaluation factor S respectively. Among them, the Q factor needs to set the corresponding RSSI classification standard table according to the characteristics of different satellite communication systems. Taking the Tiantong satellite as an example, its RSSI classification standard is shown in Table 1. The S factor is determined according to the standard deviation classification standard in Table 2. Finally, the comprehensive evaluation factor E = 0.6Q + 0.4S is obtained through weighted calculation.

[0047] Table 1 RSSI Classification Standard of Tiantong Satellite

[0048] RSSI (dBm) Quality assessment factor Q ＞-75 1.0 -80～-75 0.9 -85～-80 0.8 -90～-85 0.7 -95～-90 0.6 ＜-95 0.2

[0049] Table 2 Standard Deviation Classification Standard

[0050]

[0051]

[0052] Step 4: The application processing system executes the corresponding handover strategy based on the value of the comprehensive evaluation factor E. When E is greater than or equal to 0.6, the system maintains the operation of the current communication link. When E is less than 0.6, the system triggers the link handover mechanism, and the link handover module controls the satellite access module to select satellite access in the priority order of "Tiantong satellite → relay satellite → Beidou short message service". After completing the link handover, the system continues to execute the feature acquisition process in Step 1 to form a closed-loop control and ensure the reliability of the communication link.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A satellite communication application processing system suitable for sea surface buoys, characterized in that: include: Data protocol processing module, satellite network access module and link switching module, wherein: The data protocol processing module is responsible for the communication protocol conversion and processing of data between the sea surface buoy and the shore-based end; The satellite network access module is used to realize the access function with the Tiantong satellite network, the relay satellite network and the Beidou satellite network; The link switching module is used to evaluate the communication quality of the current link by collecting the signal strength of the satellite in real time, and to ensure the real-time and reliable transmission of data through the satellite link autonomous switching method.

2. The satellite communication application processing system for sea surface buoys according to claim 1, characterized in that: The data protocol processing module includes: Receive buoy data from the sea surface buoy, package it according to the satellite network that needs to be accessed, and send it to the satellite network access module; perform protocol analysis on the data received by the satellite network access module from the shore-based end, package it, and forward it to the sea surface buoy.

3. The satellite communication application processing system for sea surface buoys according to claim 1, characterized in that: When accessing the Tiantong satellite network, the processing process of the satellite network access module includes: Execute the sending power-on command, the detecting satellite signal strength command and the querying network registration status command in sequence; After confirming that the registration is successful, perform network environment configuration, set up the packet data protocol environment, configure identity authentication information and service quality parameters in sequence; Configure the data channel, including clearing existing channel data, setting channel binding relationships, and configuring port reporting parameters; Initiate a dial-up connection to establish a two-way communication link between the sea surface buoy - Tiantong satellite - shore base.

4. The satellite communication application processing system for sea surface buoys according to claim 1, characterized in that: When accessing the relay satellite network or the Beidou satellite network, the processing process of the satellite network access module includes: Data is packetized and format converted according to the data protocol specifications of the relay satellite or Beidou satellite, and sent to the corresponding satellite. The satellite's communication unit completes the data transmission and establishes a two-way communication link between the sea surface buoy - relay satellite / Beidou satellite - shore base.

5. The satellite communication application processing system suitable for sea surface buoys according to claim 1, characterized in that: The processing process of the link switching module includes repeating the following steps: Step 1: Collect the signal strength data of the communication link in real time, calculate the average value of the signal strength, and record the amplitude and frequency of signal fluctuations; Step 2: Evaluate the signal strength level and channel stability of the collected signal features; Step 3: Adopt a dual evaluation factor judgment mechanism to calculate the signal quality evaluation factor Q and the sea state stability evaluation factor S respectively, and then obtain the comprehensive evaluation factor E through weighted calculation; Step 4: Execute the corresponding switching strategy based on the value of the comprehensive evaluation factor E: when E is greater than or equal to 0.6, maintain the operation of the current communication link; When E is less than 0.6, the link switching mechanism is triggered, and satellite access is selected in the priority order of Tiantong satellite → relay satellite → Beidou short message.

6. The satellite communication application processing system suitable for sea surface buoys according to claim 5, characterized in that: The channel stability evaluation in step 2 is determined by calculating the standard deviation σ.

7. The satellite communication application processing system suitable for sea surface buoys according to claim 5, characterized in that: The signal quality evaluation factor Q in step 3 is graded according to the signal strength data RSSI, including: When RSSI>-75, Q=1.0; when -80≤RSSI<-75, Q=0.9; when -85≤RSSI<-80, Q=0.8; when -90≤RSSI<-85, Q=0.7; when -95≤RSSI<-90, Q=0.6; when RSSI<-95, Q=0.2, where RSSI is in dBm.

8. The satellite communication application processing system for sea surface buoys according to claim 5, characterized in that: The stability evaluation factor S in step 3 is graded according to the standard deviation σ, including: When σ<2, S=1; when 2≤σ<4, S=0.8; when 4≤σ<6, S=0.6; when 6≤σ<8, S=0.4; when 8≤σ<10, S=0.2; when σ>10, S=0.

9. The satellite communication application processing system suitable for sea surface buoys according to claim 5, characterized in that: The comprehensive evaluation factor E of step 3 satisfies the following formula: E=0.6Q+0.4S.

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