A Dynamic Evaluation Method for the State of Wireless Communication Links between Ships

Abstract

The present invention discloses a method for dynamically evaluating the state of a wireless communication link between ships. This method receives and parses / generates communication plan information autonomously through an on-board control system in real time, obtains the position information of marine communication objects detected and generated by on-board detection and sensing devices, generates the position information of the ship itself and the meteorological environment information around the ship by a navigation device, generates wireless link state information by a communication device, and comprehensively utilizes the above information to evaluate, analyze and display the connectivity state of the wireless communication link between ships at sea, so as to provide auxiliary judgment on the wireless communication connectivity ability for on-board communication personnel. The method for dynamically evaluating the state of a wireless communication link between ships provided by the present invention has a certain system self-learning and optimization ability, making up for the deficiencies of the method for auxiliary judgment of the on-off warning of the ship communication link.

Description

Technical Field

[0001] The present invention belongs to the field of ship information communication, and particularly relates to a method for dynamically evaluating the state of a wireless communication link between ships. Background Art

[0002] According to the communication requirements of shore-sea and maritime networking, the ship communication system is configured with communication means of different frequency bands and satellite communication means. The communication between ships at sea mainly uses wireless communication means such as shortwave / ultrashortwave frequency bands and microwave frequency bands for voice, data, and telegram interactive transmission. Due to the relatively complex maritime electromagnetic environment and climatic environment, and the real-time dynamic change of the positions of communication objects, the connection state and communication quality of the wireless communication link are affected by multiple factors such as the maritime electromagnetic environment, climatic environment, and the distance between communication objects. The communication link operates unstably, resulting in poor communication between ships. At present, there is still a lack of a method that can judge the on-off state of the ship communication link in real time. Summary of the Invention

[0003] To solve the above problems, the present invention provides a method for dynamically evaluating the state of a wireless communication link between ships. This method is based on the analysis of multi-source information of the ship information system and the correlation analysis of characteristic quantities to evaluate the state of the wireless communication link between ships and judge the on-off state of the communication link between ships in real time.

[0004] The object of the present invention is achieved through the following technical solutions. A method for dynamically evaluating the state of a wireless communication link between ships includes the following steps:

[0005] Step 1: Analyze the characteristic quantities affecting the state of the wireless communication link and construct a characteristic quantity database for the state of the wireless communication link;

[0006] Step 2: Based on the processing results of multi-source information analysis, extract the characteristic quantities of communication objects, confirm the real-time positions of maritime communication objects, and perform correlation processing on the identity information and position information of communication objects;

[0007] Step 3: Calculate the distance between the communication object and the own ship according to the source of the positioning information of the communication object;

[0008] Step 4: Calculate the communication coverage range of the wireless communication link between ships according to the frequency band, working mode of the wireless communication link between ships, and characteristic quantities such as the height of the communication antenna installed on the own ship and the communication object, and meteorological information;

[0009] Step 5: Establish the grading conditions for the on-off warning level of the wireless communication link between ships and the quality level of the wireless communication link between ships, and perform on-off analysis of the link between ships according to the above conditions to give the corresponding on-off warning level;

[0010] Step 6: Collect data on the moment when the wireless communication link between ships is interrupted in real time and the on-off characteristic information data of the communication link at this moment, and update the database of wireless communication link state characteristic quantities; perform dynamic evaluation by using the information in the on-off state database of the wireless communication link and the calculation results based on the information at the current moment of the link described in Step 5.

[0011] Preferably, in Step 1, the database of wire communication link state characteristic quantities includes communication object identity information, communication network information, communication link information, own ship position information, own ship motion information, communication object position information, communication object motion information, communication object positioning time, distance between the communication object and the own ship, relative bearing of the communication object to the own ship, height of the own ship's communication antenna, height of the communication object's antenna, relative humidity, rainfall, and communication link state information.

[0012] Preferably, Step 2 further includes the following steps:

[0013] Step 2.1: Receive the external communication plan information message in real time through the wireless link, parse the message according to the wireless link information transmission protocol format, and extract the communication object identity information and communication network information characteristic quantities in the message.

[0014] Step 2.2: If there is no external communication plan information, generate the communication plan information formulated by the shipborne control system, and extract the communication object information and communication network information characteristic quantities in the communication plan.

[0015] Step 2.3: The shipborne satellite navigation and positioning device receives and parses the messages of the identity, position, and motion elements of the marine ship, and the calculation module extracts the communication object platform number, platform type, information source code, communication object position information, positioning time, communication object course, and speed characteristic quantities.

[0016] Step 2.4: Generate information such as the position and motion elements of the marine target in real time through the shipborne detection sensor device, and extract the target type, target course, speed, distance between the target and the own ship, and bearing characteristic quantities.

[0017] Step 2.5: Establish a link communication with the wireless communication device according to the communication plan, confirm the identity and position information of the communication object, check and associate with the target position and identity information generated by the satellite navigation and positioning device and the detection and perception sensor, and determine the real-time position of the communication object.

[0018] Step 2.6: Synchronously receive and parse the longitude, latitude, speed, and course characteristic quantities generated by the inertial navigation device.

[0019] Step 2.7: Synchronously receive and parse the relative humidity and rainfall characteristic quantities generated by the meteorological sensing device.

[0020] Step 2.8: Synchronously receive and parse the real-time wireless link status information generated by the communication device, including: operating frequency, operating mode, link signal-to-noise ratio, link on / off status, and channel quality level characteristic quantity.

[0021] Preferably, in step 3, if the real-time position information source of the communication object of this ship is a satellite navigation and positioning device, the calculation method of the distance between the communication object and this ship includes the following steps:

[0022] Parse the position information of the communication object received by the satellite positioning device and the longitude and latitude information of this ship generated by the inertial navigation device of this ship. If the position information of this ship is consistent with the receiving time of the position information of the communication object, calculate the distance D1 between this ship and the communication object through the haversine formula:

[0023]

[0024] In the formula, are the longitude and latitude information of the position of this ship, are the longitude and latitude information of the communication object; r is the radius of the earth;

[0025] Preferably, in step 3, when the connecting line between the two points of this ship and the communication object is close to the center of the earth or the communication object, calculate the distance D2 between this ship and the communication object through the spherical cosine theorem:

[0026]

[0027] Preferably, in step 3, if the generation time (t1) of the position information of this ship is inconsistent with the time (t2) of the position information of the communication object, perform dynamic extrapolation calculation based on the characteristic quantities of the course γ2 and speed v2 of the communication object and the characteristic quantities of the course γ1 and speed v1 of this ship, and calculate the distance D3 between this ship and the communication object at the later generation time as the distance between this ship and the communication object;

[0028] If the t1 moment is later than the t2 moment, then extrapolate the longitude and latitude of the communication object at the t1 moment. Assume that the communication object sails uniformly in a straight line according to the course γ2 and speed v2 at the t2 moment from the t2 to the t1 moment, and perform extrapolation calculation on the longitude and latitude of the communication object at the t1 moment to obtain the longitude λ t1 and latitude Calculate the distance between this ship and the communication object through the spherical cosine theorem.

[0029] Preferably, in step 3, if it is associated and confirmed that the real-time position information source of the communication object of this ship is the real-time position information of the target detected and generated by the detection sensor device of this ship, then extract the target distance information of the associated communication object, which is the real-time distance between this ship and the communication object.

[0030] Preferably, in step 4, the calculation method for the communication coverage range of the wireless communication link between ships includes: obtaining the communication distance R of the wireless communication link at a certain operating frequency and operating mode according to the communication link frequency, operating mode characteristic quantity, and the antenna height characteristic quantities of the own ship and the communication object. That is, the theoretical communication range of this wireless communication link is a circular area centered on the position of the own ship with a radius of R.

[0031] Preferably, in step 5, compare the distance between the communication object and the own ship obtained in step 3 with the coverage range R of the wireless communication link obtained in step 4. Classify the level information of the communication link quality according to the description of the quality level rating of the wireless communication link between ships, and combine the communication channel quality level and the comparison result of the real-time distance between the communication object and the own ship and the theoretical coverage range of the wireless link. Give an on / off warning prompt for the wireless communication link according to the on / off warning level of the wireless communication link between ships.

[0032] Preferably, step 6 further includes the following steps:

[0033] Step 6.1: According to the wireless communication link status information obtained by real-time monitoring of the communication device, record the moment when the communication link is interrupted, and record the associated characteristic quantities of the wireless communication link at this moment collected and calculated in steps 1 to 4, and update the data information in the wireless communication link status characteristic quantity database.

[0034] Step 6.2: Jointly evaluate the status of the wireless communication link according to the wireless communication link status characteristic quantity database and the results obtained in steps 1 to 5.

[0035] The beneficial effects brought by the present invention are as follows:

[0036] As can be seen from the above solution, the present invention provides a method for dynamically evaluating the status of a wireless communication link between ships. Based on information from multiple systems / devices such as on-board satellite navigation and positioning devices, detection and sensing devices, communication devices, inertial navigation devices, and control devices, characteristic quantities that affect the on / off status of the wireless communication link between ships are extracted and generated to form a database. Use relevant characteristic quantity information for calculation to evaluate and give warning prompts for the on / off status of the communication link. At the same time, real-time collect the on / off status of the communication link and the data of the characteristic quantities affecting the on / off of the wireless link in the terminal situation, update the database information, accumulate historical data, use it as a comparison sample for the next round of evaluation and analysis, optimize the theoretical evaluation method of the communication link status, provide auxiliary judgment data for the ship's communication personnel to evaluate the wireless communication ability of the ship, and have a certain system self-learning and optimization ability, making up for the deficiencies of the domestic auxiliary judgment method for the on / off warning of ship communication links.

[0037] The present invention receives and analyzes / generates communication plan information in real time through an on-board control system, obtains the position information of marine communication objects detected and generated by on-board detection and sensing devices, generates the position information of the ship itself and the meteorological environment information around the ship by navigation devices, generates wireless link status information by communication devices, and comprehensively uses the above information to evaluate, analyze and display the connection status of wireless communication links between marine vessels, providing auxiliary judgment on the wireless communication connection ability for on-board communication personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flowchart of a method for dynamically evaluating the status of wireless communication links between ships in the present invention;

[0039] Figure 2 It is a flowchart of the position information association processing in step 2 of the embodiment of the present invention;

[0040] Figure 3 It is a flowchart of calculating the real-time distance between the ship itself and the communication object in step 3 of the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] As Figure 1 shown, the technical solution of the present invention provides a method for dynamically evaluating the status of wireless communication links between ships, which specifically includes the following steps:

[0043] Step 1: Analyze the characteristic quantities affecting the status of wireless communication links, and construct a database of characteristic quantities of wireless communication link status. The correspondence between the characteristic quantities and the information sources is shown in Table 1:

[0044] Table 1 Correspondence Table of Characteristic Quantities and Information Sources of Wireless Communication Link Status between Ships

[0045]

[0046]

[0047]

[0048] 2: Based on the parsing and processing results of multi-source (control device, detection and sensing device, satellite positioning device, navigation device, communication device) information, extract the characteristic quantities of communication objects (identity information, position information, networking information, link status information). The information sources of the feature vectors include:

[0049] The sources of communication object identity information include: extraction and generation from communication plan information, parsing and obtaining of information received by shipborne satellite navigation equipment, and parsing and obtaining of information received by wireless communication links;

[0050] The sources of communication object positioning information include: detection and generation by shipborne detection and sensing equipment, and parsing and obtaining of information received by shipborne satellite navigation equipment;

[0051] The source of the own ship's positioning information: generated by shipborne inertial navigation equipment;

[0052] The sources of the working frequency, working mode, signal-to-noise ratio, and link status information of the wireless communication link: generated by shipborne communication equipment;

[0053] The source of meteorological information (rainfall): detection and acquisition by shipborne meteorological sensors, and parsing and obtaining of information received by wireless communication links;

[0054] The antenna height information of the communication object and the own ship: design value.

[0055] In a preferred embodiment of the present invention, based on the processing results of parsing and extracting multi-source information, the real-time position of the marine communication object is confirmed, and the process of correlating the communication object identity information and position information is as Figure 2 shown:

[0056] Step 2.1: Receive the external communication plan information message in real time through the wireless link, parse the message according to the wireless link information transmission protocol format, and extract the communication object identity information and communication network information feature quantities in the message. Among them, the identity information includes the task number, platform number, network number, information source number, and platform type, and the communication network information includes the network type and the number of network members;

[0057] Step 2.2: If there is no external communication plan information, generate the communication plan information formulated by the shipborne control system, and extract the communication object information and communication network information feature quantities in the communication plan. Among them, the communication object information includes the task number, platform number, network number, information source number, and platform type, and the communication network information includes the network type and the number of network members;

[0058] Step 2.3: The shipborne satellite navigation and positioning equipment receives and parses the identity, position, and motion element information messages of the marine ship, and the calculation module extracts the communication object platform number, platform type, information source code, communication object position information (longitude, latitude), positioning time, communication object course, and speed feature quantities.

[0059] Step 2.4: Real-time detect and generate information such as the position and motion elements of the marine target through the shipborne detection sensor equipment, and extract the target type, target course, speed, distance between the target and the own ship, and azimuth feature quantities;

[0060] Step 2.5: Conduct link establishment communication for the wireless communication device according to the communication plan, confirm the identity and location information of the communication object, check and correlate with the target location and identity information generated by the satellite navigation and positioning device and the detection and sensing sensor, and determine the real-time location of the communication object;

[0061] Step 2.6: Synchronously receive and analyze the longitude, latitude, speed, and course characteristic quantities of the ship generated by the inertial navigation device;

[0062] Step 2.7: Synchronously receive and analyze the relative humidity and rainfall characteristic quantities generated by the meteorological sensing device;

[0063] Step 2.8: Synchronously receive and analyze the real-time status information of the wireless link generated by the communication device, including: operating frequency, operating mode, link signal-to-noise ratio, link on / off status, and channel quality level characteristic quantities.

[0064] Step 3: Select different methods to calculate the distance between the communication object and the ship according to the source of the communication object's positioning information.

[0065] As Figure 3 shown, as a further optimization of the above embodiment, in another embodiment of the present invention, if the real-time position information source of the ship's communication object is a satellite navigation and positioning device, the calculation method of the distance between the communication object and the ship includes the following steps:

[0066] Analyze the position information of the communication object received by the satellite positioning device and the longitude and latitude information of the ship generated by the ship's inertial navigation device (obtained in Step 2.3). If the longitude and latitude information of the ship's position (obtained in Step 2.3) is consistent with the receiving time of the communication object's position information, calculate the distance D1 between the ship and the communication object through the haversine formula:

[0067]

[0068] In the formula, is the longitude and latitude information of the ship's position, is the longitude and latitude information of the communication object; r is the radius of the earth ≈ 6371 km.

[0069] In another embodiment of the present invention, when the connecting line between the ship and the communication object is close to the center of the earth or the communication object, calculate the distance D2 between the ship and the communication object through the spherical cosine theorem:

[0070]

[0071] If the time t1 when the position information of the own ship is generated is inconsistent with the time of the position information of the communication object t2, dynamic extrapolation calculation is performed based on the course γ2 and speed v2 characteristic quantities of the communication object (obtained in step 2.3) and the course γ1 and speed v1 characteristic quantities of the own ship (obtained in step 2.6). The distance D3 between the own ship and the communication object at the later generation time is calculated as the distance between the own ship and the communication object.

[0072] As the most preferred embodiment of the above, if the time t1 is later than the time t2, the longitude and latitude of the communication object at the time t1 are deduced. Assuming that the communication object sails uniformly in a straight line at the course γ2 and speed v2 from the time t2 to the time t1, the longitude and latitude of the communication object at the time t1 are extrapolated and calculated to obtain the longitude λ of the communication object at the time t1. t1 and latitude The distance between the own ship and the communication object is calculated by the spherical cosine theorem.

[0073] If it is associated and confirmed that the source of the real-time position information of the own ship's communication object is the real-time position information of the target detected by the own ship's detection sensor device, the target distance information of the associated communication object is extracted, that is, the real-time distance D4 between the own ship and the communication object.

[0074] Step 4: Calculate the communication coverage range of the inter-ship wireless communication link (the theoretical communication distance between the own ship and the communication object) according to the characteristic quantities such as the frequency band, working mode of the inter-ship wireless communication link, the height of the communication antenna mounted on the own ship and the communication object, and the meteorological information.

[0075] The calculation method of the communication coverage range of the inter-ship wireless communication link includes: obtaining the communication distance R of the wireless communication link under a certain working frequency and working mode according to the characteristic quantities of the communication link frequency and working mode (obtained in step 2.8) and the characteristic quantities of the antenna heights of the own ship and the communication object (design values). That is, the theoretical communication range of this wireless communication link is a circular area centered on the position of the own ship with a radius of R.

[0076] If the communication link is a VHF, L-band, S-band, or C-band communication link, combined with the characteristic that electromagnetic waves in the above frequency bands propagate in a straight line in space, the communication distance of the above wireless link is mainly affected by factors such as the earth's curvature, the distance between the communication antenna and the horizontal plane, including the height h1 of the own ship's communication antenna from the horizontal plane, the height h2 of the communication object's communication antenna from the horizontal plane, and the flight height H of the communication object. The theoretical communication distance of this frequency band can be obtained by using the line-of-sight theory formula of the communication distance:

[0077] If the communication object is a sea surface platform, the theoretical communication distance of this frequency band can be expressed as:

[0078]

[0079] If the communication object is an aerial platform, the theoretical communication distance of this frequency band can be expressed as:

[0080]

[0081] Step 5: Perform link on / off analysis according to the preset evaluation conditions, and give the on / off warning level:

[0082] In an embodiment of the present invention, the method for giving the on / off warning level in Step 5 is: compare the distances D1 / D2 / D3 / D4 between the communication object obtained in Step 3 and the ship itself with the wireless communication link coverage range R obtained in Step 4, classify the level information generated for the communication link quality according to the rating description of the wireless communication link quality level between ships, combine the communication channel quality level and the comparison result of the real-time distance between the communication object and the ship itself and the theoretical coverage range of the wireless link, and give a wireless communication link on / off warning prompt according to the on / off warning level of the wireless communication link between ships.

[0083] In this embodiment, the preset evaluation conditions include the on / off warning level table of the wireless communication link between ships and the rating description of the wireless communication link quality level between ships. Among them, the on / off warning level table of the wireless communication link between ships is shown in Table 2:

[0084] Table 2 On / Off Warning Level Table of Wireless Communication Link between Ships

[0085]

[0086] Among them, D is the distance between the actually detected communication object and the ship itself, and R is the communication range of the ship calculated theoretically.

[0087] The rating description of the wireless communication link quality level between ships is shown in Table 3:

[0088]

[0089]

[0090] In this embodiment, the rating description of the wireless communication link quality level between ships refers to the communication equipment voice quality level standard and evaluation method of GJB2673-1996.

[0091] Step 6: Real-time collect the interruption time of the wireless communication link between ships and the data of the on / off characteristic information of the communication link at this time, and update the wireless communication link state characteristic quantity database, including the working frequency, working mode, number of network members, link signal-to-noise ratio, relative humidity / rainfall, and communication distance calculation data between the target and the ship itself at the moment of link interruption. Use the information in the on / off state database of the wireless communication link accumulated and the calculation results of the information based on the current moment of the link described in Step 5 for dynamic evaluation, which further includes the following steps:

[0092] Step 6.1: According to the wireless communication link status information obtained by real-time monitoring of the communication device, record the moment of communication link interruption, and record the wireless communication link association feature quantities collected and calculated in Steps 1 to 4 at this moment, and update the data information in the wireless communication link status feature quantity database;

[0093] Step 6.2: Jointly evaluate the wireless communication link status based on the wireless communication link status feature quantity database and the results obtained in Steps 1 to 5

[0094] When the wireless communication link is established and used, update the wireless communication link status feature quantity database according to Step 6.1. At the same time, traverse the historical information of the wireless communication link status feature quantity database. By comparing the key feature quantities of the database historical data, including the distance between the communication object and the ship, the networking type, the number of network members, the communication frequency band, the working mode, the link signal-to-noise ratio, the relative humidity, and the rainfall, give a consistency judgment on the link interruption situation according to the threshold ranges of each key feature quantity preset in advance. If the key feature quantities in the current link establishment situation are all within the consistency threshold range, make a warning judgment according to the on / off status of the historical situation. If there are key feature quantities that are not within the consistency threshold range after traversal, give an alarm for the on / off warning level of the inter-ship wireless communication link according to the calculation method and evaluation conditions in Steps 4 and 5, and update the wireless communication link status feature quantity database according to Step 6.1.

[0095] A method for dynamically evaluating the wireless communication link status between ships provided by the technical solution of the present invention receives and analyzes / autonomously generates communication plan information through the on-board control system, the position information of the marine communication object detected and generated by the on-board detection and sensing device, the position information of the ship generated by the navigation device and the meteorological environment information around the ship, and the wireless link status information generated by the communication device. Comprehensively utilize the above information to evaluate, analyze and display the connection status of the wireless communication link between ships at sea, and provide an auxiliary judgment on the wireless communication connection ability for the on-board communication personnel.

[0096] The above is the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can also be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A dynamic evaluation method for the state of a wireless communication link between ships, characterized in that: The method includes the following steps: Step 1: Analyze the characteristic quantities affecting the state of the wireless communication link, and construct a database of characteristic quantities of the wireless communication link state; Step 2: Based on the parsing and processing results of multi-source information, extract the characteristic quantities of the communication object, confirm the real-time position of the maritime communication object, and perform an association process on the identity information and position information of the communication object; Step 3: Calculate the distance between the communication object and the own ship according to the source of the positioning information of the communication object; Step 4: Calculate the communication coverage range of the wireless communication link between ships according to the frequency band, working mode of the wireless communication link between ships, the height of the communication antenna installed on the own ship and the communication object, and the meteorological information; Step 5: Establish the grading conditions for the on / off warning level of the wireless communication link between ships and the quality level of the wireless communication link between ships, and perform an on / off analysis of the link between ships according to the above conditions, and give the specific on / off warning level as follows: Compare the distance between the communication object and the own ship obtained in Step 3 with the wireless communication link coverage range R obtained in Step 4, classify the grade information of the communication link quality according to the rating description of the quality level of the wireless communication link between ships, and combine the quality level of the wireless communication link with the comparison result of the real-time distance between the communication object and the own ship and the theoretical coverage range of the wireless link, and give the on / off warning prompt level of the wireless communication link according to the on / off warning level of the wireless communication link between ships; Step 6: Real-time collect the interruption time of the wireless communication link between ships and the data of the on / off characteristic information of the communication link at that time, and update the database of characteristic quantities of the wireless communication link state; use the information in the on / off state database of the wireless communication link accumulated and the calculation results based on the information at the current moment of the link in Step 5 for dynamic evaluation, specifically as follows: Update the database of characteristic quantities of the wireless communication link state, and at the same time traverse the historical information of the database of characteristic quantities of the wireless communication link state. By comparing the key characteristic quantities of the historical data in the database, and according to the threshold range of each key characteristic quantity preset, give a consistency judgment on the link interruption situation. If the key characteristic quantities in the current link establishment situation are all within the consistency threshold range, make a warning judgment according to the on / off state of the historical situation; if there are key characteristic quantities that are not within the consistency threshold range after traversal, give an on / off warning level warning of the wireless communication link between ships according to the calculation method and evaluation conditions in Steps 3-5.

2. The dynamic evaluation method for the state of the wireless communication link between ships according to claim 1, wherein: In Step 1, the database of characteristic quantities of the wireless communication link state includes the identity information of the communication object, communication network information, communication link information, the position information of the own ship, the movement information of the own ship, the position information of the communication object, the movement information of the communication object, the positioning time of the communication object, the distance between the communication object and the own ship, the relative bearing of the communication object to the own ship, the height of the communication antenna of the own ship, the height of the communication antenna of the communication object, relative humidity, rainfall, and communication link state information.

3. The dynamic evaluation method for the state of the wireless communication link between ships according to claim 2, characterized in that: Step 2 further includes the following steps: Step 2.1: Receive the external communication plan information message in real time through the wireless communication link, parse the message according to the wireless link information transmission protocol format, and extract the characteristic quantities of the identity information and communication network information of the communication object in the message; Step 2.2: If there is no external communication plan information, extract the communication object information and communication network information feature quantities from the communication plan information formulated and generated by the on-board control system; Step 2.3: The on-board satellite navigation and positioning device receives and analyzes the messages of the identity, position, and motion element information of the marine ship. The calculation module extracts the feature quantities of the communication object platform number, platform type, information source code, communication object position information, positioning time, communication object course, and speed; Step 2.4: The on-board detection sensor device is used to detect and generate the position and motion element information of the marine target in real time, and extract the feature quantities of the target type, target course, speed, distance between the target and the ship, and azimuth; Step 2.5: Establish a link communication with the wireless communication device according to the communication plan, confirm the identity and position information of the communication object, check and associate with the target position and identity information generated by the satellite navigation and positioning device and the detection and perception sensor, and determine the real-time position of the communication object; Step 2.6: Synchronously receive and analyze the feature quantities of the longitude, latitude, speed, and course of the ship generated by the inertial navigation device; Step 2.7: Synchronously receive and analyze the feature quantities of relative humidity and rainfall generated by the meteorological sensing device; Step 2.8: Synchronously receive and analyze the real-time status information of the wireless link generated by the communication device, including: operating frequency, operating mode, link signal-to-noise ratio, link on / off status, and wireless communication link quality level feature quantities.

4. The dynamic evaluation method for the state of the wireless communication link between ships according to claim 3, characterized in that: In step 3, if the real-time position information source of the ship's communication object is the satellite navigation and positioning device, the calculation method of the distance between the communication object and the ship includes the following steps: Analyze the communication object position information received by the satellite positioning device and the longitude and latitude information of the ship generated by the ship's inertial navigation device. If the ship's position information is consistent with the receiving time of the communication object position information, calculate the distance D1 between the ship and the communication object through the haversine formula: Wherein, (λ1, ) are the longitude and latitude information of the position of the own ship, (λ2, ) are the longitude and latitude information of the communication object; r is the radius of the earth.

5. The dynamic evaluation method for the state of the wireless communication link between ships according to claim 3, wherein: In step 3, when the connecting line between the ship and the communication object is close to the center of the earth or the communication object, calculate the distance D2 between the ship and the communication object through the spherical cosine theorem:

6. The dynamic evaluation method for the state of a wireless communication link between ships according to claim 3, characterized in that: In step 3, if the generation time t1 of the ship's position information is inconsistent with the time t2 of the communication object's position information, perform dynamic extrapolation calculation according to the feature quantities of the communication object's course γ2, speed v2 and the ship's course γ1, speed v1, and calculate the distance D3 between the ship and the communication object at the later generation time as the distance between the ship and the communication object; If the time t1 is later than the time t2, then the longitude and latitude of the communication object at time t1 are extrapolated. Assuming that the communication object sails uniformly in a straight line at the heading γ2 and speed v2 at time t2 from t2 to t1, the longitude and latitude of the communication object at time t1 are extrapolated and calculated to obtain the longitude λ of the communication object at time t1 t1 and latitude Calculate the distance between the own ship and the communication object through the spherical cosine theorem.

7. The dynamic evaluation method for the state of the wireless communication link between ships according to claim 3, characterized in that: In step 3, if it is associated and confirmed that the real-time position information source of the ship's communication object is the real-time position information of the target detected and generated by the ship's detection sensor device, extract the target distance information of the associated communication object, that is, the real-time distance between the ship and the communication object.

8. A method for dynamically evaluating the state of a wireless communication link between ships according to any one of claims 4-7, characterized in that: In step 4, the calculation method of the communication coverage range of the wireless communication link between ships includes: obtaining the communication distance R of the wireless communication link under the corresponding operating frequency and operating mode according to the operating frequency and operating mode feature quantities of the communication link, and the antenna height feature quantities of the ship and the communication object. That is, the theoretical communication range of this wireless communication link is a circular area centered on the ship's position with a radius of R.

9. A method for dynamically evaluating the state of a wireless communication link between ships according to claim 8, characterized in that: Step 6 further includes the following steps: Step 6.1: According to the wireless communication link status information obtained by real-time monitoring of the communication device, record the moment when the communication link is interrupted, and record the wireless communication link associated feature quantities collected and calculated at this moment in steps 1 to 4, and update the data information in the wireless communication link status feature quantity database; Step 6.2: Jointly perform wireless communication link status evaluation based on the wireless communication link status feature quantity database and the results obtained in steps 1 to 5.

Images