Reliable transmission method of firefighting information in communication blind areas based on Beidou short message

Abstract

The present invention relates to the field of communication transmission technology, and specifically to a method for reliably transmitting firefighting information in communication blind spots based on Beidou short messages, comprising: obtaining sent message data and position data as well as sent signal strength, and obtaining received message data and received signal strength; obtaining a key information delay index based on the time difference between the corresponding key information in the sent message data and the received message data, combined with the difference between the amount of key information in the sent message data and the received message data; analyzing the signal movement loss situation based on the time difference between adjacent different position data when the message is sent, and obtaining a transmission priority index based on the difference between the sent signal strength and the received signal strength and the key information delay index; analyzing the signal transmission frequency of segmented data transmission based on the transmission priority index, and determining the optimal transmission method for firefighting information. The present invention ensures the stability and reliability of firefighting information in communication blind spots during the transmission process.

Description

Technical Field

[0001] The present invention relates to the field of communication transmission technology, and in particular to a method for reliably transmitting firefighting information in communication blind areas based on Beidou short messages. Background Art

[0002] The BeiDou Navigation Satellite System (BDS) is a global satellite navigation system independently developed by my country, offering positioning, navigation, timing, and short message communication capabilities. Short message communication (SMC) is a key feature of the BDS. Unlike traditional mobile communication networks that rely on ground-based base stations, SMC relies directly on satellite links for information transmission. Optical quantum radar, a device that utilizes quantum technology for high-precision spatial perception and information acquisition, can detect and locate targets in communication blind spots, a method for transmitting information in firefighting areas.

[0003] In recent years, disasters such as forest fires and mountain fires have occurred in areas with complex terrain and inadequate communication infrastructure, often creating communication blind spots. Traditional mobile communication networks (such as 4G and 5G), which rely on ground-based base stations, struggle to cover these remote areas. Once a fire breaks out, on-site information cannot be transmitted to the command center in a timely manner, significantly reducing rescue efficiency and potentially causing greater loss of life and property.

[0004] The existing Beidou short message communication system transmits information from terminal devices to a command center or optical quantum radar fire detection system, enabling communication in blind areas. However, due to the relatively limited data volume transmitted by the Beidou short message system and the data delay caused by the long transmission path, this method, which transmits fire information in segments, cannot balance data transmission delays with data loss caused by the mobility of ground terminals. It is also unable to adjust the most suitable radio wave frequency band for transmission, thereby reducing the reliability of fire information transmission in communication blind areas. Summary of the Invention

[0005] In order to solve the technical problem that the existing short message transmission method cannot adjust the more suitable radio wave frequency band for transmission, thereby reducing the reliability of fire information transmission in communication blind spots, the purpose of the present invention is to provide a method for reliable transmission of fire information in communication blind spots based on Beidou short messages. The technical solution adopted is as follows:

[0006] Obtain the sent message data and location data of the fire information and the sending signal strength when the message is sent, and obtain the received message data and the receiving signal strength of the fire information when the message is received;

[0007] According to the time difference between the corresponding key information in the sent message data and the received message data, combined with the difference between the amount of key information in the sent message data and the received message data, the key information delay index of each segment data in the sent message data is obtained;

[0008] Analyze the signal movement loss situation based on the time difference between adjacent position data corresponding to the time when the message is sent, and combine the difference between the sending signal strength and the receiving signal strength and the key information delay index to obtain the transmission priority index of each segment data in the sent message data;

[0009] According to the transmission priority index, the signal transmission frequency of the segmented data transmission is analyzed to determine the optimal transmission method of the fire protection information.

[0010] Preferably, the key information delay indicator of each segmented data in the sent message data is obtained based on the time difference between the corresponding key information in the sent message data and the received message data, combined with the difference between the amount of key information in the sent message data and the received message data, specifically including:

[0011] The segmented data is specifically a key information segment, including: based on the message protocol, the sending message data is segmented to obtain the key information segment of the sending message data; the sending message data and the receiving message data both include multiple key information segments;

[0012] Obtaining a data delay factor for each key information segment of the sent message data based on a difference between a sending time and a receiving time of each key information segment of the sent message data and a data volume of each key information segment of the sent message data;

[0013] According to the difference between the data amount in each key information segment of the sent message data and the data amount in the same key information segment of the received message data, combined with the data delay factor, the key information delay index of each key information segment of the sent message data is obtained.

[0014] Preferably, obtaining the data delay factor of each key information segment of the sent message data based on the difference between the sending time and the receiving time of each key information segment of the sent message data, combined with the amount of data in each key information segment of the sent message data, specifically includes:

[0015] The data delay factor of each key information segment of the transmitted message data is determined based on the product of the time interval between the transmission time and the reception time of each key information segment of the transmitted message data and the number of bytes in the same key information segment of the transmitted message data.

[0016] Preferably, the key information delay index of each segmented data in the sent message data is obtained based on the difference between the data amount in each key information segment of the sent message data and the data amount in the same key information segment in the received message data, in combination with the data delay factor, specifically including:

[0017] determining a data loss coefficient for each key information segment based on a difference between the number of bytes in each key information segment of the transmitted message data and the number of bytes in the same key information segment of the received message data, wherein the difference is positively correlated with the data loss coefficient;

[0018] The product of the data delay factor and the data loss coefficient of each key information segment of the sent message data is used as the key information delay indicator of each key information segment.

[0019] Preferably, the analyzing of the signal movement loss situation based on the time difference between adjacent position data corresponding to different positions when the message is sent, and combining the difference between the sending signal strength and the receiving signal strength and the key information delay index to obtain the transmission priority index of each segment data in the sent message data specifically includes:

[0020] For any key information segment, obtain the time node corresponding to each location data contained in the key information segment; obtain the terminal mobility characteristic factor of the key information segment based on the difference between the time nodes corresponding to adjacent location data contained in the key information segment;

[0021] Obtaining a signal shielding factor for the key information segment based on a difference between a transmitted signal strength and a received signal strength of the key information segment and environmental topography information of each location data, combined with the terminal mobility characteristic factor;

[0022] The transmission priority index of the key information segment in the sent message data is obtained according to the signal blocking factor and the key information delay index, the signal blocking factor is negatively correlated with the transmission priority index, and the key information delay index is positively correlated with the transmission priority index.

[0023] Preferably, obtaining the terminal mobility characteristic factor of the key information segment according to the difference between the time nodes corresponding to the adjacent position data included in the key information segment specifically includes:

[0024] The time interval between time nodes corresponding to each two adjacent position data contained in the key information segment is obtained, and the reciprocal of the mean of all time intervals is used as the terminal mobility feature factor of the key information segment.

[0025] Preferably, the signal shielding factor of the key information segment is obtained based on the difference between the transmitted signal strength and the received signal strength of the key information segment and the environmental topography information of each location data, combined with the terminal mobility characteristic factor, specifically including:

[0026] Based on the environmental data of each position data of the key information segment, a neural network is used to obtain a geomorphic feature factor of each position data, wherein the geomorphic feature factor is used to characterize the signal blocking probability of the corresponding position data;

[0027] The ratio between the transmission signal strength and the received signal strength of the key information segment is obtained, and the product of the ratio and the average of the terrain feature factors of all location data and the terminal mobility feature factor is used as the signal shielding factor of the key information segment.

[0028] Preferably, obtaining the transmission priority index of the key information segment in the sent message data according to the signal shielding factor and the key information delay index specifically includes:

[0029] The normalized result of the L2 norm between the inverse of the signal shielding factor and the key information delay index is calculated to obtain the transmission priority index of the key information segment in the sent message data.

[0030] Preferably, analyzing the transmission frequency of the segmented transmission signal according to the transmission priority index specifically includes:

[0031] When the transmission priority index of the key information segment is greater than or equal to the preset preferred threshold, the signal transmission frequency of the key information segment is increased; when the transmission priority index of the key information segment is less than the preset preferred threshold, the signal transmission frequency of the key information segment is decreased.

[0032] Preferably, the method for obtaining the data loss coefficient of each key information segment is specifically as follows:

[0033] The difference between the number of bytes in each key information segment of the sent message data and the number of bytes in the same key information segment in the received message data plus a preset hyperparameter is used as the data loss coefficient of each key information segment, and the value range of the hyperparameter is (0, 0.1).

[0034] The embodiments of the present invention have at least the following beneficial effects:

[0035] The present invention first obtains information of multiple dimensions when the message data of the fire information is sent and received, providing a data basis for the subsequent data analysis process. Then, by analyzing the time difference between the key information of the message data before and after transmission and the difference in key information, the delay of each segment in the transmission of key information is quantitatively analyzed from these two characteristic dimensions, that is, the key information delay index. Furthermore, the data loss during signal movement is analyzed based on the time difference between adjacent data at different positions, and then the priority selection of frequency band radio waves during data transmission is quantitatively analyzed in combination with the attenuation during signal transmission and the key information delay. That is, the transmission priority index is used to characterize that by balancing the relationship between the delay in the message information transmission process and the dynamic changes of the ground terminal, the core byte segment containing the key information is selected to select a suitable radio wave frequency segment, and the fire information of the segmented data is transmitted, thereby ensuring that the key fire information can be quickly transmitted, and at the same time, the stability and reliability of the fire information in the communication blind spot during the transmission process are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a flowchart of a method for reliably transmitting firefighting information in communication blind areas based on Beidou short messages provided by the present invention;

[0038] Figure 2 It is a schematic diagram of message segmentation transmission provided by the present invention;

[0039] Figure 3 This is a flowchart of the steps of the method for obtaining the key information delay indicator provided by the present invention;

[0040] Figure 4 It is a flowchart of the steps of the method for obtaining the transmission priority indicator provided by the present invention;

[0041] Figure 5 is a schematic diagram of the movement trajectory of the sending terminal provided by the present invention;

[0042] Figure 6 This is a structural diagram of a reliable transmission system for firefighting information in communication blind areas based on Beidou short messages provided by the present invention;

[0043] Figure 7 It is a structural schematic diagram of a computer device provided by the present invention. DETAILED DESCRIPTION

[0044] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following, in combination with the accompanying drawings and preferred embodiments, describes in detail the specific implementation method, structure, characteristics and effects of a reliable transmission method of fire protection information in communication blind spots based on Beidou short messages proposed by the present invention.

[0045] Before introducing the specific solutions provided in the embodiments of the present application, some of the uses in the present application are explained to facilitate understanding by those skilled in the art, and are not intended to limit the uses in the present application.

[0046] The process of forming and sending short messages for fire protection information: In communication blind spots, such as when a fire occurs in a forest area, real-time fire protection information can be transmitted through the Beidou terminal in the form of Beidou short messages. The Beidou terminal sends the encapsulated message to the Beidou satellite via wireless signal. After receiving the message information, the Beidou satellite forwards it to the target receiving terminal (such as the command center) according to the protocol.

[0047] In the following description, different references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0048] The following describes in detail a method for reliably transmitting firefighting information in communication blind areas based on Beidou short messages provided by the present invention in conjunction with the accompanying drawings.

[0049] See also Figure 1 , which shows a flowchart of a method for reliably transmitting firefighting information in a communication blind area based on Beidou short messages provided by one embodiment of the present invention, the method comprising the following steps:

[0050] Step S100: acquiring the sending message data, location data and sending signal strength of the fire protection information when the message is sent, and acquiring the receiving message data and receiving signal strength of the fire protection information when the message is received.

[0051] To obtain fire information in communication blind spots, it is necessary to rely on a variety of information collection methods and equipment. In this embodiment, the forest fire area is mainly used as the main analysis object of the communication blind spot; the optical quantum radar fire warning and emergency rescue platform is used as the receiving end or control center of the fire information.

[0052] Smoke sensors, temperature sensors, video surveillance equipment, etc. are pre-deployed in high-risk areas with communication blind spots, that is, areas with a high incidence of forest fires. The Beidou terminals carried by ground firefighters can upload their locations in real time. Firefighters enter the task execution status through the terminal and upload it in the form of short messages.

[0053] The various types of fire data collected are summarized in real time through the local data processing system. A microcontroller or embedded system can be used to collect and preliminarily analyze the data. The collected fire information includes the location of the fire, detailed fire data, time of the fire, etc. Among them, the detailed fire data can be used as key data, including smoke concentration, fire range, temperature, wind direction and speed, and fire type. In this embodiment, the fire type is forest fire.

[0054] The packaged firefighting information is sent via satellite links via deployed Beidou terminals, also known as Beidou short message terminals and Beidou communication modules. The satellite system can transmit this information in real time or on a time-scheduled basis to designated receiving terminals, such as the optical quantum radar fire warning and emergency rescue platform. The Beidou terminals encode and compress the collected firefighting information and package it in structured message form for data transmission.

[0055] As a specific example, the data to be packaged is: longitude and latitude: N30.56789, E120.12345; fire type: forest fire; fire range: 500 square meters; smoke concentration: 0.8 mg / m³; wind direction and speed: north, 3 km / h; the compressed longitude and latitude field information is: L: N30.56789, E120.12345, and the content of this field is converted into a binary byte stream compliant with the Beidou protocol: 01101110 00110011 00110000 00101110 0011010100110110 00110111 00111000 00111001.

[0056] In this embodiment, UTF-8 encoding can be used to encode text information. This encoding method is well-known and will not be further described here. At this point, the signal transmitter can obtain the transmitted message data and the transmitted signal strength of the fire protection information when the message is transmitted, while the signal receiver can obtain the received message data and the received signal strength of the fire protection information when the message is received. It is understood that the signal strength can be obtained using a corresponding signal collector, and will not be further described here.

[0057] Furthermore, the segmented transmission mechanism is combined to realize multi-segment transmission. The purpose of multi-segment transmission is to efficiently transmit fire information within the length limit of Beidou short message, such as Figure 2As shown, when the fire protection information is transmitted through message information segments, different frequency segments can be used or the same frequency segment can be used to achieve the purpose of efficiently transmitting the fire protection information.

[0058] Based on this, it is necessary to segment the sent message data and obtain each segmented data. In this embodiment, segmentation is performed based on the distribution of key information in the message data, that is, the message part containing key information is treated as an independent segment. Specifically, based on the message protocol, the sent message data is segmented to obtain the key information segments of the sent message data; both the sent message data and the received message data include multiple key information segments.

[0059] More specifically, in this embodiment, detailed fire data is used as key data, and the corresponding fields in the message for each key data item are referred to as key information segments. A transmitted message contains multiple key information segments, each of which is a data segment. It is understood that after the control center receives the message information sent by the ground-based Beidou terminal via the satellite link, it decodes it to recover the actual content of the message information. Similarly, the received message data also contains the corresponding key information segments.

[0060] At this point, the sent message data includes the sent signal strength for each key information segment and the corresponding key information segment when the segment is sent, and the received message data includes the received signal strength for each key information segment and the corresponding key information segment when the segment is received. It is also understood that the message sender is generally a Beidou terminal carried by ground firefighters, which can upload their location in real time. That is, during the transmission of each key information segment, the longitude and latitude of the Beidou terminal can be recorded in real time as location data. The location data represents the movement of the sending terminal during the transmission of the key information segment message.

[0061] It should be noted that this embodiment uses important data in fire protection information as an example to analyze the adjustment of data transmission frequency. In other embodiments, implementers can use the same adjustment method to analyze different segments of fire protection data.

[0062] Step S200 , obtaining a key information delay indicator for each segment of the sent message data based on the time difference between the corresponding key information in the sent message data and the received message data, combined with the difference between the amount of key information in the sent message data and the received message data.

[0063] By analyzing the delay and byte loss during the transmission of segmented message information, we can reflect the probability of information loss in the byte segment containing key information during the sending-receiving time period, and then determine whether to use the current frequency band to send the core data message information to reduce signal loss and achieve efficient message transmission.

[0064] In practice, firefighters can transmit the actual fire information message fields to a satellite link. This embodiment uses a complete message data as an example, which contains multiple key information segments. It should be understood that message data refers to the packaged fire data. The message data that has been sent is called sent message data, and the message data that has been received is called received message data. Considering the possibility of signal loss during message data transmission, the information between the sent and received message data may not be completely consistent. Based on this feature, the difference in data volume can be analyzed to reflect the degree of information loss.

[0065] In this embodiment, if Figure 3 As shown, the method for obtaining the key information delay indicator of each segment data in the sent message data can be implemented by steps S201 to S202.

[0066] Step S201 : obtaining a data delay factor of each key information segment of the sent message data according to the difference between the sending time and the receiving time of each key information segment of the sent message data and the amount of data in each key information segment of the sent message data.

[0067] When ground terminals send message information to satellites or command centers, the core fields of the message generally require a faster transmission speed, that is, a lower data transmission delay is expected. A larger delay may increase the bit error rate during data transmission, which may cause the loss of key information. Therefore, by analyzing the interval between message sending and receiving time, the delay of the current message sending can be quantified.

[0068] Specifically, the data delay factor of each key information segment of the transmitted message data is determined based on the product of the time interval between the sending time and the receiving time of each key information segment of the transmitted message data and the number of bytes in the same key information segment of the transmitted message data.

[0069] In this embodiment, as a specific example, any key information segment is taken as an example for explanation, then the data delay factor of the i-th key information segment is The calculation method can be expressed as: ,in =1, 2, ..., , Indicates the total number of key information segments, Indicates the sending time of the i-th key information segment, that is, the time when the i-th key information segment message is sent to the BeiDou satellite link during the actual transmission process; Indicates the reception time of the i-th key information segment, that is, the time when the message of the i-th key information segment is actually received. Indicates the number of bytes contained in the i-th key information segment.

[0070] Indicates the length of the time interval between the sending time and the receiving time of the key information segment. The larger the value, the greater the information delay from the time dimension. The more bytes there are, the greater the possibility of transmission delay in the actual message transmission process. The larger the value of , the higher the transmission delay rate of the message information corresponding to the key information segment. The data delay factor represents the information delay of the message information transmission corresponding to the key information segment.

[0071] Step S202 , obtaining a key information delay indicator for each key information segment of the sent message data based on the difference between the data volume in each key information segment of the sent message data and the data volume in the same key information segment of the received message data, combined with the data delay factor.

[0072] First, the data delay factor compares the delay in message information transmission from the time dimension. Second, it is necessary to analyze the data loss in message information transmission from the data volume dimension, and then evaluate whether the effect of message information transmission using the current radio wave frequency band is appropriate.

[0073] Specifically, based on the difference between the number of bytes in each key information segment of the transmitted message data and the number of bytes in the same key information segment in the received message data, a data loss coefficient for each key information segment is determined, and the difference is positively correlated with the data loss coefficient; and the product of the data delay factor of each key information segment of the transmitted message data and the data loss coefficient is used as the key information delay indicator of each key information segment.

[0074] More specifically, in this embodiment, the difference between the number of bytes in each key information segment of the transmitted message data and the number of bytes in the same key information segment in the received message data plus a preset hyperparameter is used as the data loss coefficient of each key information segment. The value range of the hyperparameter is (0, 0.1], where the preset hyperparameter is used to correct the difference to avoid the result of the difference calculation being 0 and thus affecting the calculation result. The value in this embodiment is 0.01.

[0075] As a specific example, the key information delay indicator of the i-th key information segment of the sent message data is The calculation method can be expressed as:

[0076]

[0077] in, Indicates the key information delay indicator of the i-th key information segment of the sent message data, Indicates the data delay factor of the i-th key information segment of the sent message data, Indicates the number of bytes contained in the i-th key information segment of the sent message data, Indicates the number of bytes in the same key information segment corresponding to the i-th key information segment in the received message data, It is a preset hyperparameter, and its value in this embodiment is 0.01.

[0078] The data loss coefficient reflects the byte loss of the core field message data during transmission. The larger the value, the greater the possibility of loss during data transmission. When the frequency band of the radio wave does not match the message information, message information delay or even byte loss will occur.

[0079] The product of the data loss factor and the data delay factor It can characterize the bit error rate of the core field message information during the data transmission process. If the message information is delayed or lost during the data transmission process, the decoding of the message byte segment will be untimely or erroneous, resulting in a larger information bit error rate. The corresponding key information delay indicator value will be larger.

[0080] At this point, the key information delay indicator of each key information segment in the transmitted message data can be obtained according to the same method, which characterizes the bit error and information delay of the key fields in the message information during the transmission process.

[0081] When a high bit error rate occurs during data transmission, it's necessary to adjust the radio frequency band used for segmented message transmission. For example, high-frequency bands have a smaller transmission range and faster speeds, while low-frequency bands have a larger transmission range and slower speeds. This characteristic necessitates further detailed analysis of signal transmission.

[0082] Step S300: Analyze the signal movement loss situation based on the time difference between adjacent different position data when the message is sent, and combine the difference between the sending signal strength and the receiving signal strength and the key information delay index to obtain the transmission priority index of each segmented data in the sent message data.

[0083] Generally speaking, when the message information of key fields has a large information transmission delay during the data transmission process, a higher frequency band should be selected for data transmission to ensure that the key information in the message information can be quickly transmitted to the satellite or control center. However, considering that the firefighters carrying ground terminals are in a dynamic state, when the coverage range of radio waves is small, there is a high possibility of signal loss as the terminal moves, which increases the possibility of information loss during the message information transmission process and cannot meet the expectation of reliable transmission of information in communication blind spots. Therefore, it is necessary to balance the relationship between the delay of the message information transmission process and the dynamic changes of the ground Beidou terminal, and select the largest radio wave frequency band to reliably transmit the message information.

[0084] Based on this feature, this embodiment combines the characteristic information of multiple dimensions, such as the degree of position change of the ground Beidou terminal, the degree of obstruction during the data transmission process, and the degree of delay, to quantitatively characterize the priority of selecting the high-frequency band when transmitting each key information segment. As a specific example, this embodiment takes any key information segment in the message data as an example for explanation. Figure 4 As shown, the method for obtaining the transmission priority indicator can be implemented by steps S301 to S303.

[0085] Step S301: Obtain a time node corresponding to each location data included in the key information segment; and obtain a terminal mobility feature factor of the key information segment based on the difference between the time nodes corresponding to adjacent location data included in the key information segment.

[0086] The location data represents the movement of the sending terminal during the transmission of the key information segment. By analyzing the distribution of the time intervals between different location data, the movement of the terminal when the location changes can be reflected. Figure 5 As shown, it shows a curve diagram of the movement trajectory of the sending terminal changing with time during a period of time when sending message information is sent, which shows the change of the movement distance of the sending terminal changing with time.

[0087] During the transmission of the key information segment message, when the location information of the sending terminal changes, the time interval between the corresponding adjacent positions reflects the speed of movement of the sending terminal. Specifically, the time interval between the time nodes corresponding to each two adjacent location data contained in the key information segment is obtained, and the inverse of the mean of all time intervals is used as the terminal movement characteristic factor of the key information segment.

[0088] Two adjacent location data points refer to two adjacent location data points when the location data changes. For example, the location data at the second time node changes relative to the location data at the first time node. Therefore, the time interval between the first time node and the second time node is obtained. The larger the time interval, the slower the moving speed of the sending terminal is, and the longer the time it takes to move the location. Furthermore, the balance of all time intervals during the transmission of the current key information segment reflects the movement information of the ground terminal during the corresponding key time period.

[0089] The smaller the value of the mean of all time intervals, the shorter the time required for the ground terminal to move from one location point to the next during the movement, that is, the ground mobile terminal has a faster moving speed. Therefore, the larger the value of a certain characteristic factor of the corresponding terminal, the faster the movement. The faster moving speed may require low-frequency radio waves to transmit message information, because low-frequency radio waves cover a wider range, but the signal transmission rate is slower.

[0090] Step S302 : obtaining a signal shielding factor of the key information segment based on the difference between the transmitted signal strength and the received signal strength of the key information segment and the environmental topography information of each location data in combination with the terminal movement characteristic factor.

[0091] The first step is to quantitatively characterize the signal obstruction during data transmission at each location by analyzing the surrounding terrain information surrounding each location data point. Specifically, based on the environmental data of each location data point in the key information segment, a neural network is used to obtain a terrain characteristic factor for each location data point. This terrain characteristic factor is used to characterize the signal obstruction probability of the corresponding location data point.

[0092] More specifically, this embodiment uses a neural network model to obtain the geomorphic feature factors of each location data. The training process of the neural network model is as follows: the input of the network is the environmental data of each location data of the key information segment, wherein the environmental data includes vegetation information, terrain information and building information corresponding to the location data; based on a large amount of historical data, the environmental data of each location data of the key information segment is manually labeled, and the label value range is (0,1). The smaller the value, the smaller the signal occlusion probability of the corresponding location data, and the larger the value, the greater the signal occlusion probability of the corresponding location data. The output of the network is the geomorphic feature factor of each location data of the key information segment, with a value range of (0,1), and the loss function adopts the cross entropy loss function.

[0093] It's understandable that the process of obtaining the topographic characteristic factor is essentially for engineers or experts to evaluate the signal obstruction probability of each location based on extensive historical field survey data. This is used to quantify the signal obstruction situation during data transmission at each location. A larger topographic characteristic factor value indicates a greater probability of signal obstruction during data transmission at that location.

[0094] The second step is to obtain the ratio between the transmission signal strength and the received signal strength of the key information segment, and use the ratio and the product of the average of the terrain feature factors of all location data and the terminal mobility feature factor as the signal shielding factor of the key information segment.

[0095] As a specific example, taking the i-th key information segment in the transmitted message data as an example, the calculation formula for the signal shielding factor of the i-th key information segment in the transmitted message data can be expressed as: ,in, Indicates the signal shielding factor of the i-th key information segment of the sent message data, Represents the mean value of the geomorphic feature factors of all location data of the i-th key information segment of the sent message data, Represents the terminal mobility characteristic factor of the i-th key information segment of the sent message data, Indicates the sending signal strength of the i-th key information segment of the sent message data, Indicates the received signal strength corresponding to the i-th key information segment of the sent message data in the received message data.

[0096] The larger the value of , the faster the ground terminal moves during the transmission of the key information segment, and the greater the impact of the environment in the area where the ground terminal is located on signal transmission. The larger the value, the greater the degree of signal attenuation during signal transmission, and the larger the corresponding signal obstruction factor value. In this case, the probability of signal obstruction when using high-frequency radio waves to transmit message information is higher, which means that the reliability of the message information in this key information segment during data transmission is low, which is prone to signal loss and transmission delay.

[0097] At this point, the same method can be used to obtain the signal obstruction factor for each key information segment, which represents the probability of signal obstruction during transmission of the message information in the corresponding key field. Furthermore, combined with the delay during data transmission, the message information can be analyzed to determine whether higher or lower frequency radio waves are used for data transmission.

[0098] Step S303: obtaining a transmission priority index of a key information segment in the sent message data according to the signal shielding factor and the key information delay index.

[0099] Based on the delay in the transmission process of the core field containing key information in the above-mentioned message information and the signal obstruction rate generated during the actual movement of the ground terminal, the appropriate radio wave frequency band is selected for the current core field by balancing the two states. Therefore, the characteristic analysis results of the two aspects are comprehensively analyzed to quantitatively evaluate the priority of using high-frequency bands in the current message information transmission.

[0100] Specifically, the signal obstruction factor is negatively correlated with the transmission priority indicator, while the key information delay indicator is positively correlated with the transmission priority indicator. More specifically, taking any key signal segment in the transmitted message data as an example, the normalized L2 norm between the inverse of the signal obstruction factor and the key information delay indicator is calculated to obtain the transmission priority indicator for the key information segment in the transmitted message data. The normalization method can employ a maximum-minimum value normalization method, which is a well-known technique and will not be further described here.

[0101] A larger value for the signal obstruction factor indicates that the movement of the transmitting terminal is likely to cause signal loss, which results in poorer data transmission results using high-frequency bands. Therefore, a smaller value for the corresponding transmission priority indicator is recommended. A larger value for the key information delay indicator indicates that there is a significant information transmission delay during data transmission. High-frequency bands are more effective for data transmission, which results in a higher value for the corresponding transmission priority indicator.

[0102] The transmission priority index can balance the relationship between the delay in the message information transmission process and the dynamic movement of the ground terminal, so that the frequency band of the radio waves in the core segment's message information transmission process is more matched. The transmission priority index represents the priority of the corresponding key information segment using higher frequency band radio waves for data transmission.

[0103] Step S400: Analyze the signal transmission frequency of the segmented data transmission according to the transmission priority index to determine the optimal transmission method of the fire protection information.

[0104] The larger the value of the transmission priority indicator of the key information segment, the higher the priority of the message information of the corresponding key information segment in using the high frequency band. The smaller the value of the transmission priority indicator of the key information segment, the lower the priority of the message information of the corresponding key information segment in using the high frequency band, and the lower frequency band radio waves should be used for data transmission.

[0105] Based on this, when the transmission priority index of the key information segment is greater than or equal to the preset preferred threshold, it means that the message information of the key information segment has a higher priority in using the high-frequency band, and the signal transmission frequency of the key information segment is increased. When the transmission priority index of the key information segment is less than the preset preferred threshold, it means that the message information of the key information segment has a lower priority in using the high-frequency band, and the signal transmission frequency of the key information segment is decreased.

[0106] In this embodiment, considering that the transmission priority index is a normalized value, the corresponding preferred threshold value range is (0, 1). In this embodiment, 0.5 is taken as the threshold value used to determine the priority of the transmission priority index, representing the transmission priority index value corresponding to the frequency band that needs to be increased and the frequency band that needs to be decreased based on 0.5 as the boundary. The increase operation can be achieved by increasing the current transmission frequency of each key information segment by one frequency band, and the decrease operation can be achieved by decreasing the current transmission frequency of each key information segment by one frequency band.

[0107] It is understood that the ranking order of high frequency bands and low frequency bands is well known. For example, the ranking order of high frequency bands, from low to high, is: high frequency band (HF), very high frequency band (VHF), ultra high frequency band (UHF), ultra high frequency band (SHF), and extremely high frequency band (EHF). The ranking order of low frequency bands, from high to low, is: mid frequency band (MF), low frequency band (LF), very low frequency band (VLF), and extremely low frequency band (ELF). Furthermore, the ranking order of frequency bands, from low to high, can be expressed as: extremely low frequency band (ELF), very low frequency band (VLF), low frequency band (LF), mid frequency band (MF), high frequency band (HF), very high frequency band (VHF), ultra high frequency band (UHF), ultra high frequency band (SHF), and extremely high frequency band (EHF). By determining the frequency band corresponding to each key information segment, the increase or decrease operation is performed according to the ranking order.

[0108] By optimizing the frequency band for core fields in message information, we can ensure that these critical data can be transmitted stably even in fluctuating network environments. This can improve the success rate of key information transmission and reduce errors and packet loss during segment message data transmission. This can ensure the reliable transmission of firefighting information, especially in communication blind spots or high-interference environments.

[0109] To summarize, this embodiment first obtains the delay rate during the sending process based on the sending time and receiving time of the core fields in the pre-marked message information and the number of bytes; then obtains the bit error situation during the message information transmission process based on the difference in the number of bytes in the decoding process; then, based on the moving trajectory of the ground terminal in the monitoring time period, the signal obstruction rate caused by the dynamic changes of the ground terminal is analyzed according to the time changes of the moving trajectory and the signal obstruction situation in the area where it is located, and then, by balancing the relationship between the delay in the message information transmission process and the dynamic changes of the ground terminal, a suitable radio wave frequency segment is selected for the core byte segment containing the key information, thereby ensuring that the key fire information can be transmitted quickly while also ensuring the stability and reliability of the fire information in the communication blind spot during the transmission process.

[0110] like Figure 6 As shown, the present invention also provides a reliable transmission system for fire protection information in communication blind areas based on Beidou short messages, comprising:

[0111] A data acquisition module, which acquires the sending message data and location data of the fire information and the sending signal strength when the message is sent, and acquires the receiving message data and the receiving signal strength of the fire information when the message is received;

[0112] The delay analysis module is used to obtain the key information delay index of each segment data in the sent message data based on the time difference between the corresponding key information in the sent message data and the received message data, combined with the difference between the amount of key information in the sent message data and the received message data;

[0113] a transmission analysis module for analyzing signal movement loss based on the time difference between adjacent position data corresponding to the time when the message is sent, and combining the difference between the transmitted signal strength and the received signal strength and the key information delay index to obtain a transmission priority index for each segment of the transmitted message data;

[0114] The data transmission module is used to analyze the signal transmission frequency of the segmented data transmission according to the transmission priority index and determine the optimal transmission method of the fire protection information.

[0115] The present application also provides a computer device. Figure 7, which shows a schematic diagram of the structure of a computer device provided by an embodiment of the present invention, the computer device includes a memory 701, a processor 702, and a computer program 703 stored in the memory 701 and running on the processor 702, wherein when the processor 702 executes the computer program 703, the computer device can execute the aforementioned method for reliable transmission of fire protection information in communication blind spots based on Beidou short messages.

[0116] An embodiment of the present application also provides a computer program product. When the computer program product runs on a computer device, the computer device can execute the aforementioned method for reliably transmitting firefighting information in communication blind spots based on Beidou short messages.

[0117] An embodiment of the present application also provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer device, the computer device can execute the aforementioned method for reliably transmitting fire protection information in communication blind spots based on Beidou short messages.

[0118] In the embodiments provided in the present application, it should be understood that the provided computer devices, computer program products and computer-readable storage media are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the methods provided above and will not be repeated here.

[0119] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for reliably transmitting firefighting information in communication blind areas based on Beidou short messages, characterized in that: The method comprises the following steps: Obtain the sent message data and location data of the fire information and the sending signal strength when the message is sent, and obtain the received message data and the receiving signal strength of the fire information when the message is received; According to the time difference between the corresponding key information in the sent message data and the received message data, combined with the difference between the amount of key information in the sent message data and the received message data, the key information delay index of each segment data in the sent message data is obtained; According to the time difference between the adjacent different position data corresponding to the time when the message is sent, the signal movement loss situation is analyzed, and the transmission priority index of each segmented data in the sent message data is obtained by combining the difference between the sent signal strength and the received signal strength and the key information delay index; the segmented data is a key information segment, and the transmission priority index of the key information segment in the sent message data is the normalized result of the L2 norm between the signal obstruction factor of the key information segment and the key information delay index. The signal obstruction factor is determined based on the difference between the sent signal strength and the received signal strength of the key information segment, the environmental topography information of each position data, and the terminal movement characteristic factor of the key information segment. The terminal movement characteristic factor is obtained based on the difference between the time nodes corresponding to the adjacent position data contained in the key information segment; According to the transmission priority index, the signal transmission frequency of the segmented data transmission is analyzed to determine the optimal transmission method of the fire protection information, specifically including: when the transmission priority index of the key information segment is greater than or equal to the preset preferred threshold, the signal transmission frequency of the key information segment is increased; when the transmission priority index of the key information segment is less than the preset preferred threshold, the signal transmission frequency of the key information segment is reduced.

2. A method for reliable transmission of firefighting information in communication blind areas based on Beidou short messages according to claim 1, characterized in that: The key information segment includes: segmenting the sent message data based on the message protocol to obtain the key information segment of the sent message data, the sent message data and the received message data each including multiple key information segments, and obtaining the key information delay index of each segment of the sent message data based on the time difference of the corresponding key information in the sent message data and the received message data, combined with the difference between the amount of key information in the sent message data and the received message data, specifically including: Obtaining a data delay factor for each key information segment of the sent message data based on a difference between a sending time and a receiving time of each key information segment of the sent message data and a data volume of each key information segment of the sent message data; According to the difference between the data amount in each key information segment of the sent message data and the data amount in the same key information segment in the received message data, combined with the data delay factor, the key information delay index of each key information segment of the sent message data is obtained.

3. The method for reliable transmission of firefighting information in communication blind areas based on Beidou short messages according to claim 2 is characterized in that: The data delay factor of each key information segment of the sent message data is obtained based on the difference between the sending time and the receiving time of each key information segment of the sent message data and the amount of data in each key information segment of the sent message data, specifically including: The data delay factor of each key information segment of the transmitted message data is determined based on the product of the time interval between the transmission time and the reception time of each key information segment of the transmitted message data and the number of bytes in the same key information segment of the transmitted message data.

4. The method for reliably transmitting firefighting information in communication blind areas based on Beidou short messages according to claim 2, characterized in that: The key information delay indicator of each key information segment of the sent message data is obtained based on the difference between the data amount in each key information segment of the sent message data and the data amount in the same key information segment of the received message data, in combination with the data delay factor, specifically including: determining a data loss coefficient for each key information segment based on a difference between the number of bytes in each key information segment of the transmitted message data and the number of bytes in the same key information segment of the received message data, wherein the difference is positively correlated with the data loss coefficient; The product of the data delay factor and the data loss coefficient of each key information segment of the sent message data is used as the key information delay indicator of each key information segment.

5. The method for reliable transmission of firefighting information in communication blind areas based on Beidou short messages according to claim 1 is characterized in that: The terminal mobility characteristic factor of the key information segment is obtained based on the difference between the time nodes corresponding to the adjacent position data contained in the key information segment, specifically including: The time interval between time nodes corresponding to each two adjacent position data contained in the key information segment is obtained, and the reciprocal of the mean of all time intervals is used as the terminal mobility feature factor of the key information segment.

6. The method for reliable transmission of firefighting information in communication blind areas based on Beidou short messages according to claim 1, characterized in that: Based on the difference between the transmitted signal strength and the received signal strength of the key information segment and the environmental topography information of each location data, combined with the terminal mobility characteristic factor, the signal shielding factor of the key information segment is obtained, specifically including: Based on the environmental data of each position data of the key information segment, a neural network is used to obtain a geomorphic feature factor of each position data, wherein the geomorphic feature factor is used to characterize the signal blocking probability of the corresponding position data; The ratio between the transmission signal strength and the received signal strength of the key information segment is obtained, and the product of the ratio and the average of the terrain feature factors of all location data and the terminal mobility feature factor is used as the signal shielding factor of the key information segment.

7. The method for reliably transmitting firefighting information in communication blind areas based on Beidou short messages according to claim 4 is characterized in that: The method for obtaining the data loss coefficient of each key information segment is specifically as follows: The difference between the number of bytes in each key information segment of the sent message data and the number of bytes in the same key information segment in the received message data plus a preset hyperparameter is used as the data loss coefficient of each key information segment, and the value range of the hyperparameter is (0, 0.1).

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