Wireless network communication system based on emergency module and emergency communication and security assurance terminal

Abstract

The invention discloses a wireless network communication system based on an emergency module and an emergency communication and safety guarantee terminal, relates to the technical field of wireless communication and emergency rescue, and aims to solve the problems of poor data interaction capability between terminals and poor emergency effect. A ground-air-sky three-dimensional communication system is constructed through a ground Mesh ad hoc network, an unmanned aerial vehicle air relay and a satellite space link, the problem of post-disaster communication interruption caused by traditional dependence on fixed facilities is solved by combining software definition radio with multiple protocols such as LoRaWAN and 5GNR, a channel is analyzed through FFT, a clean frequency band with SNR larger than or equal to 20 dB is preferably selected by combining CNN and Q-Learning algorithms, and the communication efficiency is improved. The channel utilization rate is increased by 35%, the bit error rate is reduced to below 10, cross-chain synchronization is realized through PBFT consensus and BLS aggregation signature, data tampering is resisted, the problems that traditional encryption is single and easy to crack are solved, and the system toughness in an extreme scene is enhanced.

Description

Technical Field

[0001] This invention relates to the field of wireless communication and emergency rescue technology, specifically to a wireless network communication system based on an emergency module and an emergency communication and security terminal. Background Technology

[0002] In modern society, whether it's elderly people living alone in high-rise buildings awaiting rescue, or people trapped in coal mines, earthquakes, or landslides, timely detection and rapid location are always the first steps in rescue efforts. However, traditional emergency communication systems suffer from drawbacks such as: reliance on fixed infrastructure, which can lead to communication disruptions due to base station damage after a disaster; severe frequency interference, making it impossible to dynamically avoid interference in complex electromagnetic environments; insufficient data security, such as simplistic encryption schemes that are easily cracked; and low rescue efficiency, such as a lack of multi-dimensional vital sign analysis and prioritization. Summary of the Invention

[0003] The purpose of this invention is to provide a wireless network communication system and an emergency communication and security terminal based on an emergency module. It constructs a three-dimensional "ground-air-space" communication system through ground-based mesh self-organizing network, UAV air relay, and satellite space link. Combined with software-defined radio adapted to LoRaWAN, 5G NR and other protocols, it solves the problem of post-disaster communication interruption caused by reliance on fixed facilities, and can solve the problems in the existing technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A wireless network communication system based on an emergency module includes a terminal trunking unit, a multi-dimensional relay network unit, an emergency command unit, a dynamic spectrum management unit, and a security authentication unit.

[0006] The terminal cluster unit is used to: facilitate data exchange between two types of terminals using wireless communication components;

[0007] The multi-dimensional relay network unit is used to: construct multi-dimensional communication links in the air, on the ground, and in space. The two types of terminal clusters serve as the access starting point for the multi-dimensional communication links. At the same time, the multi-dimensional communication links provide hierarchical communication support for the two types of terminals.

[0008] The emergency command unit is used to: receive data transmitted by the two types of terminals using a multi-dimensional communication link, analyze the received data, and send instructions to the two types of terminals based on the analysis results;

[0009] The dynamic spectrum management unit is used to perform frequency band analysis and selection for two types of terminals and nodes in multi-dimensional communication links.

[0010] The security authentication unit is used to encrypt the transmitted data.

[0011] Preferably, the terminal cluster unit is further configured to:

[0012] The two types of terminals include rescue terminals and trapped terminals, which have the same type and function;

[0013] Furthermore, the rescue terminal and the trapped terminal connect to external relay equipment to extend the communication range;

[0014] Multi-dimensional relay network units are also used for:

[0015] The multi-dimensional relay network consists of base stations, drones, and satellites. Drones serve as aerial relays to extend coverage, satellites enable long-distance signal backhaul, and base stations provide stable regional communication support.

[0016] The ground-based multi-dimensional communication link is constructed as follows: the rescue terminal and the trapped terminal automatically start the ground Mesh self-organizing network through the wireless networking module. The rescue terminal and the trapped terminal achieve short-range data interaction through multi-hop routing, forming the basic link for ground communication. Furthermore, the rescue terminal and the trapped terminal actively access the fixed or temporarily deployed base station through the base station communication protocol, and use the regional coverage capability of the base station to enhance the stability and transmission distance of the ground link. The base station, as the core node on the ground, aggregates terminal data within the region.

[0017] The multi-dimensional communication link in the air is constructed as follows: the emergency command center dispatches drones to take off according to the terrain of the rescue area. The drones start their own wireless communication modules and automatically enter the air relay mode. At the same time, the drones adapt to the communication protocols of ground terminals or base stations through software-defined radio technology and establish wireless connections with terminals or base stations in the ground Mesh network, becoming relay nodes for the ground link to extend into the air.

[0018] The multi-dimensional communication link in space is constructed as follows: ground terminals, base stations, or drones actively scan and lock onto satellite signals through satellite antennas, use up-conversion function to modulate data signals to satellite communication frequency bands, establish communication connection with satellites, and after receiving signals from terminals, drones, or base stations, satellites transmit data back to the emergency command center through inter-satellite links or ground gateway stations.

[0019] Furthermore, it adapts to LoRaWAN, 5G NR, and satellite protocols through software-defined radio technology;

[0020] Multi-hop routing is optimized using the improved AODV / OLSR protocol.

[0021] Preferably, the emergency command unit is further used for:

[0022] The received transmitted data includes vital signs data, location and distress call data, environmental monitoring data, terminal status data, and blockchain storage data;

[0023] The received data is prioritized for rescue operations. First, the data is classified according to a risk index. Risk index classification involves matching the received data to risk levels based on the risk index. Risk matching involves classifying the received data into high-risk, medium-risk, and low-risk categories.

[0024] If the received environmental monitoring data contains information about hazardous gas leaks or severe vibrations, its priority will be increased even if the risk index is low; conversely, if the environment is stable and the risk index does not worsen, the original level can be maintained.

[0025] At the same time, the priority is bound to the location information of the two types of terminals to confirm the specific location of the trapped personnel with high priority and mark it on the rescue map;

[0026] Rescue resources are retrieved based on the determined rescue priority. First, information on current rescue resources is collected, including the location and status of nearby rescue terminals, the real-time location and coverage of drones, the deployment area of ​​ground rescue teams, and the communication coverage capabilities of base stations and relay nodes. Then, based on the location of high-priority trapped personnel, the nearest rescue terminal or drone is dispatched to the target area.

[0027] If the trapped personnel are in a communication dead zone, deploy drones to expand aerial coverage and establish temporary communication links;

[0028] Finally, the rescue terminal completes the rescue data analysis and sends rescue commands.

[0029] Preferably, the dynamic spectrum management unit is further configured to:

[0030] Fast Fourier Transform is used to analyze the occupancy status of the channel in two types of terminals and in multidimensional communication links, and clean frequency bands with a signal-to-noise ratio ≥20dB are selected first.

[0031] The process begins by using two types of terminals to scan the full-band wireless signals within the coverage area in real time, capturing open-circuit radio waves in each band and converting them into electrical signals. The converted electrical signals are then preprocessed, and the preprocessed time-domain signals are converted into frequency-domain signals to obtain the power distribution spectrum of each frequency component. Based on the power distribution spectrum, it is determined whether the channel is occupied. Based on the power distribution spectrum, a frequency band with no obvious signal is selected as a reference, and the average noise power of the area is calculated. Then, based on the power distribution spectrum, the ratio of the signal power to the noise floor of the unoccupied channels is calculated, and the result is converted to decibels. Finally, a frequency band with a signal-to-noise ratio ≥ 20 dB is selected as the final clean frequency band.

[0032] At the same time, the frequency band selection is dynamically optimized by combining convolutional neural networks and Q-Learning algorithms;

[0033] Among them, for the selected clean frequency bands, the historical occupancy patterns are analyzed in real time using convolutional neural networks, and the long-term availability of the frequency bands is dynamically evaluated using the Q-Learning algorithm. Finally, the frequency band with SNR≥20dB, the least interference, and the highest stability is selected as the current communication frequency band.

[0034] Preferably, the security authentication unit is further configured to:

[0035] All transmitted data is encrypted using the national cryptographic encryption algorithm. Specifically, when two types of terminals generate data to be transmitted, the national cryptographic encryption algorithm is automatically activated to encrypt the entire data and form an encrypted data packet.

[0036] Simultaneously, a dynamic sharded blockchain key management mechanism is integrated, in which a global encryption key is dynamically generated based on the location of two types of terminals, network topology, and current timestamp. The generated key is split into multiple independent shards according to preset rules, and each shard contains only part of the key information.

[0037] The key fragments are stored in regional master nodes. The split key fragments are distributed to the regional master nodes for storage through a secure channel. The selection of regional master nodes is based on the principle of geographical proximity, and each master node stores only 1-2 fragments.

[0038] The verification is performed through the PBFT consensus protocol. After receiving the key fragment, the regional master node initiates the PBFT consensus protocol for verification. The verification process is as follows: the master nodes exchange fragment information with each other and check the integrity and consistency of the fragments. If more than 2 / 3 of the master nodes confirm that the fragment is valid, the fragment storage is deemed to be legal. If the verification fails, the key fragment regeneration and distribution process is triggered until all fragments pass the consensus.

[0039] Then, the two types of terminals are divided into sub-chains using geographic sharding technology. Specifically, based on the real-time location information of the two types of terminals, the rescue terminal and the trapped terminal are divided into different sub-chains using geographic sharding technology. The division process is as follows: the sub-chain boundaries are divided according to the rescue area, and terminals in the same area are assigned to the same sub-chain. Furthermore, the sub-chain independently manages the key exchange and data encryption of the local terminal.

[0040] It combines BLS aggregated signature for cross-chain synchronization with a latency of ≤50ms. Specifically, when terminals of different sub-chains need to communicate, the cross-chain synchronization mechanism is activated. The cross-chain synchronization mechanism is as follows: each sub-chain node generates a signature containing local key fragmentation information, and the multi-sub-chain signatures are aggregated into a unified signature through BLS aggregated signature technology. Furthermore, the synchronization process controls the latency to ≤50ms by optimizing the transmission path.

[0041] When the encrypted data packet is transmitted, each node calls the locally stored key fragment for real-time verification as it passes through the node.

[0042] Finally, all data is securely encrypted.

[0043] An emergency communication and security terminal based on an emergency module includes an expansion unit, a radio frequency unit, a baseband unit, an emergency unit, and a wireless networking unit;

[0044] The expansion unit is used to: capture open-circuit radio waves and convert them into electrical signals for output;

[0045] The radio frequency unit is used for: energy normalization, modulation and demodulation, and anti-interference processing of the converted electrical signals;

[0046] The baseband unit is used for: digitizing, synchronizing, and extracting content from the processed electrical signals;

[0047] The wireless networking unit is used for: data exchange between the two types of terminals and other terminals in the wireless ad hoc network;

[0048] The emergency unit is used for: multi-sensor collaborative monitoring of vital signs and the environment, and for emergency communication, location tracking, and remote wake-up.

[0049] Preferably, the expansion unit is further configured to:

[0050] It integrates multiple antennas and corresponding decoders, including FM, AM, UWB, WiFi, Bluetooth, ZigBee, LoRa, NB-IoT and satellite antennas;

[0051] The captured open-circuit radio waves are converted into electrical signals and then input to the radio frequency unit;

[0052] It also supports dynamic spectrum sensing, which automatically switches to the optimal frequency band based on the channel status.

[0053] It can also be expanded to connect gas sensors and microphone arrays;

[0054] When environmental anomalies, hazardous gases, or specific voices are detected, the corresponding communication mode switch is triggered.

[0055] The radio frequency unit is also used for:

[0056] After receiving the electrical signal from the expansion unit, the electrical signal first enters the preamplifier to amplify the weak signal and enhance the signal strength.

[0057] If the signal is too strong, the attenuator is activated to reduce the signal power, and the signal strength is controlled within a preset range through dynamic balance between amplification and attenuation.

[0058] The system will monitor the energy fluctuations of electrical signals within a preset range in real time and, in conjunction with a preset standard energy threshold, automatically adjust the operating parameters of the intermediate frequency amplifier and attenuator.

[0059] If the signal energy is below the threshold, fine-tuning and amplification continue; if it is above the threshold, attenuation is performed until the electrical signal is within the standard range.

[0060] Stray signals outside the standard range of electrical signal frequency bands are filtered out, and the filtered electrical signals are frequency-converted according to the signal transmission direction.

[0061] The frequency-converted electrical signal is filtered to remove narrowband interference in the intermediate frequency range;

[0062] If a sudden pulse interference is detected, the pulse suppression circuit is activated to temporarily block the signal during the interference period;

[0063] Finally, the anti-interference processing of the electrical signal is completed.

[0064] Preferably, the baseband unit is further used for:

[0065] After receiving the processed electrical signal, preprocessing is performed. The preprocessing is as follows: first, the electrical signal is filtered twice. The second filtering is to filter out the high-frequency noise or clutter remaining after radio frequency processing, and retain the target low-frequency signal.

[0066] Simultaneously, the signal strength is monitored in real time. If the signal is too weak, the gain is automatically increased to enhance the signal; if the signal is too strong, the gain is reduced.

[0067] The preprocessed electrical signal is digitally converted into a discrete digital signal using a high-precision analog-to-digital converter.

[0068] The digitized electrical signal undergoes synchronization processing, which includes carrier synchronization, symbol synchronization, and frame synchronization. Carrier synchronization involves locking the carrier frequency of the signal using a signal tracking loop to eliminate residual frequency deviations after radio frequency processing, and simultaneously confirming whether the local carrier frequency matches the carrier frequency of the received signal. Symbol synchronization uses OFDM-related symbol synchronization algorithms to align the symbol boundaries of the digital signal. Frame synchronization identifies the frame header identifier in the signal to determine the start position of the data frame.

[0069] Content extraction and parsing are performed on the synchronized electrical signals. Content extraction and parsing include audio content extraction and data content extraction. Audio content extraction involves decoding the digital signals to restore the speech signals, and then removing background noise through noise reduction processing. Data content extraction involves parsing the non-audio signals, removing redundant information from the digital signals, extracting key data fields, and converting them into a recognizable format.

[0070] The extracted content of audio content extraction and data content extraction is validated, and invalid or erroneous information is removed;

[0071] Finally, the extracted content that has been verified is packaged and organized to obtain a valid data packet.

[0072] Preferably, the wireless networking unit is further configured to:

[0073] After both types of terminals are started, the heartbeat module is automatically activated, and broadcast signals containing the terminal's unique identification code, device status, and location information are periodically sent.

[0074] After a nearby terminal captures the broadcast signal through a wireless receiving unit, it extracts the feature identification code and compares it with the locally stored identification code database to complete the identity verification.

[0075] After successful verification, both parties record each other's device identifiers, signal strengths, and relative locations, and establish a neighbor relationship.

[0076] After neighbor relationships are established, a self-organizing mesh network is constructed according to the improved AODV / OLSR protocol;

[0077] If the distance between the two types of terminals and their neighboring terminals is ≤500 meters and the signal is stable, a point-to-point communication link is directly established as a direct node of the network; if the distance between the two types of terminals and their neighboring terminals exceeds the direct communication range, the discovered neighboring terminals are used as relay nodes, and a multi-hop routing mechanism is adopted to form a multi-hop link between the terminal, relay terminal, and target terminal.

[0078] When the two types of terminals interact with nearby neighboring terminals, the data is first encapsulated in a preset format to form a data frame. The national cryptographic encryption algorithm is then used to encrypt the data frame, and a checksum is added to the encrypted data frame.

[0079] The encrypted data is transmitted. If the receiving terminal is a direct neighbor, the data frame is sent directly through the point-to-point link. If the receiving terminal is not a direct neighbor, the local routing table is queried to select a relay path with fewer hops and higher link quality, and the data frame is forwarded to the first-hop relay terminal.

[0080] Furthermore, data interaction is transmitted using the RTP / RTCP protocol, and audio and video streams are synchronized using SR data packet timestamps. If link congestion is detected, the sending frequency of non-critical data is automatically reduced, and non-critical data is low-priority status information.

[0081] Ultimately, this completes the data interaction between the two types of terminals and other terminals.

[0082] Preferably, the emergency unit is further configured to:

[0083] After both types of terminals are started, all integrated sensors are automatically activated, and self-testing and parameter initialization are completed.

[0084] The sensors include vital sign sensors, environmental monitoring sensors, and positioning and communication auxiliary sensors. The vital sign sensors are PPG photoplethysmography sensors, triaxial accelerometers, and infrared thermometry modules, and the sampling frequency is set after startup. The environmental monitoring sensors are gas sensors, temperature and humidity sensors, and microphone arrays, and the detection threshold is set after startup. The positioning and communication auxiliary sensors are Beidou positioning modules, remote wake-up modules, and one-button emergency call circuits, and satellite signal search initialization and wake-up signal reception frequency band calibration are completed after startup.

[0085] Vital signs sensors collect vital signs parameters in real time, while environmental monitoring sensors work in parallel with vital signs sensors to capture environmental conditions from all angles.

[0086] The collected vital signs data are fused and analyzed with environmental data. The fusion analysis calculates the basic risk value of vital signs data based on heart rate variability, body temperature deviation, and continuous rest duration. If dangerous gas leaks, violent vibrations, or "help" cries are detected, environmental risk weights are added to generate a risk index of 0-10, with level 0 being the lowest and level 10 being the highest, and the index is stored synchronously on the blockchain.

[0087] Emergency communication is triggered based on the risk assessment results. Emergency communication includes active and passive modes. In active mode, when a trapped person presses and holds the one-button distress call, a distress message is immediately generated, which includes real-time location, risk index, vital signs snapshot, and timestamp. The message is then up-converted to satellite and shortwave frequencies via a radio frequency module, or relayed via a ground-based mesh network and drones. In passive mode, if the risk index is ≥7 or if environmental sensors detect danger, the entire network broadcast mode is automatically activated without manual intervention. An emergency signal containing the location is sent to nearby terminals within a 50-meter radius, requesting relay to the emergency command center.

[0088] Furthermore, when an emergency communication is triggered, latitude and longitude information is output in real time. In open environments, positioning with an accuracy of ≤1.5 meters can be achieved directly through the BeiDou-3 system. In obstructed areas, positioning is supplemented by base station signals, RSSI relayed by drones, or satellite short messages to correct position deviations. At the same time, positioning information is transmitted synchronously with the distress signal.

[0089] When the trapped terminal is in low-power mode, the rescue terminal sends a wake-up signal at a specific frequency, and the remote wake-up module receives and identifies the signal.

[0090] After verifying the legitimacy of the wake-up signal, the trapped terminal switches from low-power mode to normal working mode, restores sensor monitoring and communication functions, and actively transmits the latest status data back to the rescue terminal.

[0091] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0092] 1. This invention provides a wireless network communication system and an emergency communication and security terminal based on an emergency module. It constructs a three-dimensional "ground-air-space" communication system through ground-based mesh self-organizing network, UAV air relay, and satellite space link. Combined with software-defined radio adapted to LoRaWAN, 5G NR and other protocols, it solves the problem of post-disaster communication interruption caused by traditional reliance on fixed facilities.

[0093] 2. The present invention provides a wireless network communication system and an emergency communication and security terminal based on an emergency module. The dynamic spectrum management unit analyzes the channel through FFT and combines CNN and Q-Learning algorithms to select clean frequency bands with SNR ≥ 20dB, thereby improving channel utilization by 35% and reducing the bit error rate to below 10.

[0094] 3. The present invention provides a wireless network communication system and an emergency communication and security terminal based on an emergency module. The emergency unit integrates vital signs and environmental sensors, and combines data such as heart rate, body temperature, and gas concentration to generate a risk index of 0-10 levels. Combined with blockchain evidence storage, it realizes dynamic determination of rescue priority, which improves the location speed of high-risk personnel by 50%. Attached Figure Description

[0095] Figure 1 This is a schematic diagram illustrating the application scenario of the wireless network communication system and emergency communication and security terminal of the present invention;

[0096] Figure 2 This is a schematic diagram of the emergency communication and security terminal hardware of the present invention;

[0097] Figure 3 This is a schematic diagram of the multimodal vital sign fusion analysis process of the present invention;

[0098] Figure 4 This is a schematic diagram of the DSA dynamic frequency band switching process of the present invention. Detailed Implementation

[0099] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0100] To address the problems in existing technologies, such as reliance on fixed infrastructure, susceptibility to post-disaster communication disruptions, poor multi-relay coordination and insufficient coverage, inaccurate rescue priority determination, inefficient resource allocation, weak ability to handle communication blind spots, and inability to meet emergency rescue needs, please refer to [link to relevant documentation]. Figures 1-4 This embodiment provides the following technical solution:

[0101] A wireless network communication system based on an emergency module includes a terminal trunking unit, a multi-dimensional relay network unit, an emergency command unit, a dynamic spectrum management unit, and a security authentication unit.

[0102] The terminal cluster unit is used to: facilitate data exchange between two types of terminals using wireless communication components;

[0103] The multi-dimensional relay network unit is used to: construct multi-dimensional communication links in the air, on the ground, and in space. The two types of terminal clusters serve as the access starting point for the multi-dimensional communication links. At the same time, the multi-dimensional communication links provide hierarchical communication support for the two types of terminals.

[0104] The emergency command unit is used to: receive data transmitted by the two types of terminals using a multi-dimensional communication link, analyze the received data, and send instructions to the two types of terminals based on the analysis results;

[0105] The dynamic spectrum management unit is used to perform frequency band analysis and selection for two types of terminals and nodes in multi-dimensional communication links.

[0106] The security authentication unit is used to encrypt the transmitted data.

[0107] The terminal cluster unit is also used for:

[0108] The two types of terminals include rescue terminals and trapped terminals, which have the same type and function;

[0109] Furthermore, the rescue terminal and the trapped terminal connect to external relay equipment to extend the communication range;

[0110] Multi-dimensional relay network units are also used for:

[0111] The multi-dimensional relay network consists of base stations, drones, and satellites. Drones serve as aerial relays to extend coverage, satellites enable long-distance signal backhaul, and base stations provide stable regional communication support.

[0112] The ground-based multi-dimensional communication link is constructed as follows: the rescue terminal and the trapped terminal automatically start the ground Mesh self-organizing network through the wireless networking module. The rescue terminal and the trapped terminal achieve short-range data interaction through multi-hop routing, forming the basic link for ground communication. Furthermore, the rescue terminal and the trapped terminal actively access the fixed or temporarily deployed base station through the base station communication protocol, and use the regional coverage capability of the base station to enhance the stability and transmission distance of the ground link. The base station, as the core node on the ground, aggregates terminal data within the region.

[0113] The multi-dimensional communication link in the air is constructed as follows: the emergency command center dispatches drones to take off according to the terrain of the rescue area. The drones start their own wireless communication modules and automatically enter the air relay mode. At the same time, the drones adapt to the communication protocols of ground terminals or base stations through software-defined radio technology and establish wireless connections with terminals or base stations in the ground Mesh network, becoming relay nodes for the ground link to extend into the air.

[0114] The multi-dimensional communication link in space is constructed as follows: ground terminals, base stations, or drones actively scan and lock onto satellite signals through satellite antennas, use up-conversion function to modulate data signals to satellite communication frequency bands, establish communication connection with satellites, and after receiving signals from terminals, drones, or base stations, satellites transmit data back to the emergency command center through inter-satellite links or ground gateway stations.

[0115] Furthermore, it adapts to LoRaWAN, 5G NR, and satellite protocols through software-defined radio technology;

[0116] Multi-hop routing is optimized using the improved AODV / OLSR protocol.

[0117] Specifically, within the terminal cluster unit, rescue and stranded terminals share the same type and function, reducing equipment procurement and maintenance costs, facilitating batch deployment and rapid replacement, and improving logistical efficiency in emergency response. Both types of terminals can access external relay equipment, overcoming their own communication distance limitations and flexibly expanding coverage in complex environments, enhancing the adaptability of on-site communication. The refined design of the multi-dimensional relay network unit offers significant advantages: on the ground, a mesh self-organizing network enables close-range autonomous interaction between terminals, and multi-hop routing ensures basic communication in complex terrain; after connecting to a base station, leveraging its regional coverage capabilities, it significantly improves the stability and transmission distance of the ground link, forming a dual guarantee of "self-organizing network + base station". Aerial drones can be dispatched on demand, and software-defined radio technology allows them to adapt to multiple communication protocols, flexibly connecting to the ground network, quickly filling signal blind spots, and enhancing the dynamic expansion capability of emergency communication. The space link achieves long-distance data backhaul via satellite, ensuring efficient communication between the command center and the site in remote areas or large-scale disaster scenarios, forming a seamless "ground-air-space" communication system, comprehensively improving the resilience and full-area coverage capability of emergency communication.

[0118] The emergency command unit is also used for:

[0119] The received transmitted data includes vital signs data, location and distress call data, environmental monitoring data, terminal status data, and blockchain storage data;

[0120] The received data is prioritized for rescue operations. First, the data is classified according to a risk index. Risk index classification involves matching the received data to risk levels based on the risk index. Risk matching involves classifying the received data into high-risk, medium-risk, and low-risk categories.

[0121] If the received environmental monitoring data contains information about hazardous gas leaks or severe vibrations, its priority will be increased even if the risk index is low; conversely, if the environment is stable and the risk index does not worsen, the original level can be maintained.

[0122] At the same time, the priority is bound to the location information of the two types of terminals to confirm the specific location of the trapped personnel with high priority and mark it on the rescue map;

[0123] Rescue resources are retrieved based on the determined rescue priority. First, information on current rescue resources is collected, including the location and status of nearby rescue terminals, the real-time location and coverage of drones, the deployment area of ​​ground rescue teams, and the communication coverage capabilities of base stations and relay nodes. Then, based on the location of high-priority trapped personnel, the nearest rescue terminal or drone is dispatched to the target area.

[0124] If the trapped personnel are in a communication dead zone, deploy drones to expand aerial coverage and establish temporary communication links;

[0125] Finally, the rescue terminal completes the rescue data analysis and sends rescue commands.

[0126] Specifically, receiving multiple types of data and storing them using blockchain ensures comprehensive information coverage, encompassing key aspects such as vital signs and environmental monitoring. The immutability of blockchain enhances data credibility, providing a reliable basis for decision-making. The rescue priority determination mechanism is scientific and flexible, with risk index grading enabling precise classification. Special processing rules for environmental data (such as prioritizing hazardous gas leaks) dynamically address sudden environmental risks, preventing delays in critical rescues due to mechanical grading and ensuring priority handling of high-threat scenarios. Priority is linked to location and marked on the rescue map, quickly pinpointing the location of high-priority trapped individuals, providing precise coordinate guidance for rescue operations, reducing location time, and improving the targeting of rescue efforts. In the resource scheduling phase, comprehensive resource information is collected first, then the nearest available resources are prioritized based on location, achieving optimal resource allocation and shortening response time. Temporary links are established for drones in communication blind spots, overcoming geographical limitations and ensuring uninterrupted communication throughout the rescue process, preventing signal problems from hindering rescue efforts. Finally, the rescue data analysis and command transmission form a closed-loop management system, making command and decision-making more scientific and significantly improving overall rescue efficiency and success rate.

[0127] To address the shortcomings of existing technologies, such as inefficient spectrum selection, weak anti-interference capabilities, limited encryption schemes, insecure key management, and high cross-chain synchronization latency, which fail to meet the demands for efficient anti-interference communication and data security in emergency scenarios, please refer to [link to relevant documentation]. Figures 1-4 This embodiment provides the following technical solution:

[0128] The dynamic spectrum management unit is also used for:

[0129] Fast Fourier Transform is used to analyze the occupancy status of the channel in two types of terminals and in multidimensional communication links, and clean frequency bands with a signal-to-noise ratio ≥20dB are selected first.

[0130] The process begins by using two types of terminals to scan the full-band wireless signals within the coverage area in real time, capturing open-circuit radio waves in each band and converting them into electrical signals. The converted electrical signals are then preprocessed, and the preprocessed time-domain signals are converted into frequency-domain signals to obtain the power distribution spectrum of each frequency component. Based on the power distribution spectrum, it is determined whether the channel is occupied. Based on the power distribution spectrum, a frequency band with no obvious signal is selected as a reference, and the average noise power of the area is calculated. Then, based on the power distribution spectrum, the ratio of the signal power to the noise floor of the unoccupied channels is calculated, and the result is converted to decibels. Finally, a frequency band with a signal-to-noise ratio ≥ 20 dB is selected as the final clean frequency band.

[0131] At the same time, the frequency band selection is dynamically optimized by combining convolutional neural networks and Q-Learning algorithms;

[0132] Among them, for the selected clean frequency bands, the historical occupancy patterns are analyzed in real time using convolutional neural networks, and the long-term availability of the frequency bands is dynamically evaluated using the Q-Learning algorithm. Finally, the frequency band with SNR≥20dB, the least interference, and the highest stability is selected as the current communication frequency band.

[0133] Specifically, by using Fast Fourier Transform (FFT) to analyze channel occupancy status, combined with full-band scanning and signal preprocessing at the terminal, a precise power distribution map can be generated, clearly determining channel occupancy and providing an accurate basis for frequency band selection, avoiding interference problems caused by blindly occupying already used channels. Prioritizing clean frequency bands with a signal-to-noise ratio (SNR) ≥ 20dB can significantly reduce noise interference in signal transmission, ensuring data transmission clarity and stability, and reducing the bit error rate, making it particularly suitable for the reliable transmission of critical information in emergency scenarios. The combination of convolutional neural networks (CNNs) and Q-Learning algorithms enables intelligent dynamic optimization of frequency band selection. Real-time analysis of historical occupancy patterns in clean frequency bands by CNNs can uncover potential frequency band usage patterns; dynamic evaluation of long-term availability by Q-Learning algorithms can predict the future stability of frequency bands. The synergistic effect of these two algorithms ultimately selects frequency bands with an SNR ≥ 20dB, minimal interference, and the highest stability, meeting current communication needs while adapting to changes in complex electromagnetic environments, reducing communication interruptions caused by frequent frequency band switching, and improving spectrum resource utilization and the continuous reliability of system communication.

[0134] The security authentication unit is also used for:

[0135] All transmitted data is encrypted using the national cryptographic encryption algorithm. Specifically, when two types of terminals generate data to be transmitted, the national cryptographic encryption algorithm is automatically activated to encrypt the entire data and form an encrypted data packet.

[0136] Simultaneously, a dynamic sharded blockchain key management mechanism is integrated, in which a global encryption key is dynamically generated based on the location of two types of terminals, network topology, and current timestamp. The generated key is split into multiple independent shards according to preset rules, and each shard contains only part of the key information.

[0137] The key fragments are stored in regional master nodes. The split key fragments are distributed to the regional master nodes for storage through a secure channel. The selection of regional master nodes is based on the principle of geographical proximity, and each master node stores only 1-2 fragments.

[0138] The verification is performed through the PBFT consensus protocol. After receiving the key fragment, the regional master node initiates the PBFT consensus protocol for verification. The verification process is as follows: the master nodes exchange fragment information with each other and check the integrity and consistency of the fragments. If more than 2 / 3 of the master nodes confirm that the fragment is valid, the fragment storage is deemed to be legal. If the verification fails, the key fragment regeneration and distribution process is triggered until all fragments pass the consensus.

[0139] Then, the two types of terminals are divided into sub-chains using geographic sharding technology. Specifically, based on the real-time location information of the two types of terminals, the rescue terminal and the trapped terminal are divided into different sub-chains using geographic sharding technology. The division process is as follows: the sub-chain boundaries are divided according to the rescue area, and terminals in the same area are assigned to the same sub-chain. Furthermore, the sub-chain independently manages the key exchange and data encryption of the local terminal.

[0140] It combines BLS aggregated signature for cross-chain synchronization with a latency of ≤50ms. Specifically, when terminals of different sub-chains need to communicate, the cross-chain synchronization mechanism is activated. The cross-chain synchronization mechanism is as follows: each sub-chain node generates a signature containing local key fragmentation information, and the multi-sub-chain signatures are aggregated into a unified signature through BLS aggregated signature technology. Furthermore, the synchronization process controls the latency to ≤50ms by optimizing the transmission path.

[0141] When the encrypted data packet is transmitted, each node calls the locally stored key fragment for real-time verification as it passes through the node.

[0142] Finally, all data is securely encrypted.

[0143] Specifically, the entire data is encrypted using national cryptographic algorithms, complying with national security standards and ensuring the privacy of data from generation to transmission, preventing unauthorized access and providing compliant and robust basic security for emergency data. The dynamic sharding blockchain key management mechanism significantly enhances key security: dynamically generated keys contain only partial information after being split, so the leakage of a single shard does not affect overall security; regional master nodes store only 1-2 shards locally, reducing the risk of key theft through distributed storage. The PBFT consensus protocol ensures the legitimacy of shards through verification by more than 2 / 3 of the nodes, forming a decentralized security verification mechanism, avoiding single-point tampering, and ensuring the integrity and consistency of key storage. Geographic sharding technology divides sub-chains by region, achieving localized key management, reducing the risk of cross-regional key interaction, and improving encryption efficiency; BLS aggregated signature technology aggregates multiple signatures during cross-chain synchronization, combined with optimized transmission with a latency of ≤50ms, ensuring both cross-chain communication security and meeting the real-time requirements of emergency scenarios. During transmission, each node calls its local key to perform real-time verification, forming a dynamic verification across the entire chain. This ensures that the encrypted data packets are not tampered with throughout the transmission process, ultimately building a closed-loop security system of "encryption-key management-cross-chain security-end-link verification".

[0144] To address the shortcomings of existing technologies, such as insufficient multi-band adaptation, unstable energy during signal processing, weak anti-interference capabilities, low synchronization accuracy after digitization, and numerous content extraction errors, which make them unsuitable for signal processing in complex emergency environments, please refer to [link to relevant documentation]. Figures 1-4 This embodiment provides the following technical solution:

[0145] An emergency communication and security terminal based on an emergency module includes an expansion unit, a radio frequency unit, a baseband unit, an emergency unit, and a wireless networking unit;

[0146] The expansion unit is used to: capture open-circuit radio waves and convert them into electrical signals for output;

[0147] The radio frequency unit is used for: energy normalization, modulation and demodulation, and anti-interference processing of the converted electrical signals;

[0148] The baseband unit is used for: digitizing, synchronizing, and extracting content from the processed electrical signals;

[0149] The wireless networking unit is used for: data exchange between the two types of terminals and other terminals in the wireless ad hoc network;

[0150] The emergency unit is used for: multi-sensor collaborative monitoring of vital signs and the environment, and for emergency communication, location tracking, and remote wake-up.

[0151] The extension unit is also used for:

[0152] It integrates multiple antennas and corresponding decoders, including FM, AM, UWB, WiFi, Bluetooth, ZigBee, LoRa, NB-IoT and satellite antennas;

[0153] The captured open-circuit radio waves are converted into electrical signals and then input to the radio frequency unit;

[0154] It also supports dynamic spectrum sensing, which automatically switches to the optimal frequency band based on the channel status.

[0155] It can also be expanded to connect gas sensors and microphone arrays;

[0156] When environmental anomalies, hazardous gases, or specific voices are detected, the corresponding communication mode switch is triggered.

[0157] The radio frequency unit is also used for:

[0158] After receiving the electrical signal from the expansion unit, the electrical signal first enters the preamplifier to amplify the weak signal and enhance the signal strength.

[0159] If the signal is too strong, the attenuator is activated to reduce the signal power, and the signal strength is controlled within a preset range through dynamic balance between amplification and attenuation.

[0160] The system will monitor the energy fluctuations of electrical signals within a preset range in real time and, in conjunction with a preset standard energy threshold, automatically adjust the operating parameters of the intermediate frequency amplifier and attenuator.

[0161] If the signal energy is below the threshold, fine-tuning and amplification continue; if it is above the threshold, attenuation is performed until the electrical signal is within the standard range.

[0162] Stray signals outside the standard range of electrical signal frequency bands are filtered out, and the filtered electrical signals are frequency-converted according to the signal transmission direction.

[0163] The frequency-converted electrical signal is filtered to remove narrowband interference in the intermediate frequency range;

[0164] If a sudden pulse interference is detected, the pulse suppression circuit is activated to temporarily block the signal during the interference period;

[0165] Finally, the anti-interference processing of the electrical signal is completed.

[0166] Specifically, the expansion unit integrates multiple types of antennas and decoders, covering multiple frequency bands such as FM and satellite, achieving cross-protocol communication compatibility. It can flexibly switch communication modes in different scenarios, adapting to diverse equipment and network environments in emergency rescue. Dynamic spectrum sensing can automatically select optimal frequency bands based on channel conditions, enhancing the anti-interference flexibility of the communication link. Connecting gas sensors and microphone arrays, it can monitor environmental anomalies in real time and trigger mode switching, realizing intelligent linkage between emergencies and communication, improving the timeliness of emergency response. The radio frequency unit stabilizes the signal strength within a preset range through dynamic balance of pre-amplification and attenuation, avoiding the loss of weak signals or the distortion of strong signals. Real-time energy monitoring and parameter adjustment mechanisms can adapt to signal fluctuations, ensuring that the electrical signal is always within the standard range, guaranteeing the stability of subsequent processing. The combined application of spurious signal filtering, narrowband filtering, and pulse suppression circuits eliminates external interference, narrowband interference, and sudden pulse interference from multiple dimensions, significantly improving signal purity. The entire anti-interference processing flow forms a closed loop, enabling the electrical signal to maintain high-quality transmission in complex electromagnetic environments, providing a stable and reliable signal foundation for emergency communication.

[0167] The baseband unit is also used for:

[0168] After receiving the processed electrical signal, preprocessing is performed. The preprocessing is as follows: first, the electrical signal is filtered twice. The second filtering is to filter out the high-frequency noise or clutter remaining after radio frequency processing, and retain the target low-frequency signal.

[0169] Simultaneously, the signal strength is monitored in real time. If the signal is too weak, the gain is automatically increased to enhance the signal; if the signal is too strong, the gain is reduced.

[0170] The preprocessed electrical signal is digitally converted into a discrete digital signal using a high-precision analog-to-digital converter.

[0171] The digitized electrical signal undergoes synchronization processing, which includes carrier synchronization, symbol synchronization, and frame synchronization. Carrier synchronization involves locking the carrier frequency of the signal using a signal tracking loop to eliminate residual frequency deviations after radio frequency processing, and simultaneously confirming whether the local carrier frequency matches the carrier frequency of the received signal. Symbol synchronization uses OFDM-related symbol synchronization algorithms to align the symbol boundaries of the digital signal. Frame synchronization identifies the frame header identifier in the signal to determine the start position of the data frame.

[0172] Content extraction and parsing are performed on the synchronized electrical signals. Content extraction and parsing include audio content extraction and data content extraction. Audio content extraction involves decoding the digital signals to restore the speech signals, and then removing background noise through noise reduction processing. Data content extraction involves parsing the non-audio signals, removing redundant information from the digital signals, extracting key data fields, and converting them into a recognizable format.

[0173] The extracted content of audio content extraction and data content extraction is validated, and invalid or erroneous information is removed;

[0174] Finally, the extracted content that has been verified is packaged and organized to obtain a valid data packet.

[0175] Specifically, secondary filtering specifically removes high-frequency noise remaining after RF processing, accurately retains the target low-frequency signal, further purifies the signal source, provides a higher-quality electrical signal foundation for subsequent processing, and reduces noise interference with information extraction. The real-time gain adjustment mechanism dynamically monitors signal strength and automatically adjusts the gain, ensuring the signal remains within a suitable processing range, avoiding the loss of key information due to weak signals or distortion due to excessively strong signals, and enhancing the system's adaptability to signal fluctuations. High-precision analog-to-digital conversion converts analog signals into discrete digital signals, retaining more original information details during the conversion process, reducing quantization errors, and providing a high-fidelity digital signal source for subsequent digital processing. Synchronization processing, through multi-layered coordination of carrier, symbol, and frame synchronization, accurately locks the carrier frequency, aligns symbol boundaries, and determines the frame start position, effectively eliminating frequency deviations and synchronization errors, significantly reducing the bit error rate in data transmission, and ensuring accurate reception and parsing of digital signals. In the content extraction and parsing stage, audio restoration combined with noise reduction improves speech clarity, and data parsing removes redundant information and extracts key fields, significantly improving the efficiency and accuracy of useful information extraction. The verification mechanism removes invalid or erroneous information, ensuring that the final packaged data packets are authentic and valid, providing reliable data support for data analysis and decision-making by the emergency command unit, and improving the information processing quality and emergency response efficiency of the entire system.

[0176] To address the shortcomings of existing technologies, such as insufficient communication coverage, low efficiency and poor security of self-organizing networks, inadequate coordination between vital signs and environmental monitoring, and delayed emergency response, which make it difficult to meet the needs of efficient rescue communication in complex environments, please refer to [link to relevant documentation]. Figures 1-4 This embodiment provides the following technical solution:

[0177] The wireless networking unit is also used for:

[0178] After both types of terminals are started, the heartbeat module is automatically activated, and broadcast signals containing the terminal's unique identification code, device status, and location information are periodically sent.

[0179] After a nearby terminal captures the broadcast signal through a wireless receiving unit, it extracts the feature identification code and compares it with the locally stored identification code database to complete the identity verification.

[0180] After successful verification, both parties record each other's device identifiers, signal strengths, and relative locations, and establish a neighbor relationship.

[0181] After neighbor relationships are established, a self-organizing mesh network is constructed according to the improved AODV / OLSR protocol;

[0182] If the distance between the two types of terminals and their neighboring terminals is ≤500 meters and the signal is stable, a point-to-point communication link is directly established as a direct node of the network; if the distance between the two types of terminals and their neighboring terminals exceeds the direct communication range, the discovered neighboring terminals are used as relay nodes, and a multi-hop routing mechanism is adopted to form a multi-hop link between the terminal, relay terminal, and target terminal.

[0183] When the two types of terminals interact with nearby neighboring terminals, the data is first encapsulated in a preset format to form a data frame. The national cryptographic encryption algorithm is then used to encrypt the data frame, and a checksum is added to the encrypted data frame.

[0184] The encrypted data is transmitted. If the receiving terminal is a direct neighbor, the data frame is sent directly through the point-to-point link. If the receiving terminal is not a direct neighbor, the local routing table is queried to select a relay path with fewer hops and higher link quality, and the data frame is forwarded to the first-hop relay terminal.

[0185] Furthermore, data interaction is transmitted using the RTP / RTCP protocol, and audio and video streams are synchronized using SR data packet timestamps. If link congestion is detected, the sending frequency of non-critical data is automatically reduced, and non-critical data is low-priority status information.

[0186] Ultimately, this completes the data interaction between the two types of terminals and other terminals.

[0187] Specifically, the automatically activated heartbeat module periodically sends broadcast signals containing terminal identifiers, status, and location, enabling real-time device status awareness and providing a foundation for dynamic network topology updates, ensuring terminal traceability in emergency scenarios. Identity verification is achieved through feature identification codes compared with a legal database, effectively blocking unauthorized device access, ensuring network access security, and preventing malicious node interference. A self-organizing mesh network is built based on the improved AODV / OLSR protocol, eliminating reliance on fixed infrastructure and adapting to the dynamic environment of emergency scenarios. Direct links or multi-hop relay links are flexibly established based on distance and signal status. Direct communication improves efficiency when the distance is ≤500 meters, while relays extend coverage beyond the range, enhancing network penetration in complex terrain. Data transmission uses a combination of national cryptographic encryption and verification codes to ensure data frames are private and intact, resisting tampering and eavesdropping during transmission. Routing selects paths with fewer hops and higher link quality, reducing transmission latency and packet loss. The RTP / RTCP protocol ensures audio and video stream synchronization; when links are congested, the frequency of non-critical data transmission is automatically reduced, prioritizing high-priority information transmission to avoid network congestion, ultimately achieving efficient, secure, and adaptive data interaction between terminals.

[0188] The emergency unit is also used for:

[0189] After both types of terminals are started, all integrated sensors are automatically activated, and self-testing and parameter initialization are completed.

[0190] The sensors include vital sign sensors, environmental monitoring sensors, and positioning and communication auxiliary sensors. The vital sign sensors are PPG photoplethysmography sensors, triaxial accelerometers, and infrared thermometry modules, and the sampling frequency is set after startup. The environmental monitoring sensors are gas sensors, temperature and humidity sensors, and microphone arrays, and the detection threshold is set after startup. The positioning and communication auxiliary sensors are Beidou positioning modules, remote wake-up modules, and one-button emergency call circuits, and satellite signal search initialization and wake-up signal reception frequency band calibration are completed after startup.

[0191] Vital signs sensors collect vital signs parameters in real time, while environmental monitoring sensors work in parallel with vital signs sensors to capture environmental conditions from all angles.

[0192] The collected vital signs data are fused and analyzed with environmental data. The fusion analysis calculates the basic risk value of vital signs data based on heart rate variability, body temperature deviation, and continuous rest duration. If dangerous gas leaks, violent vibrations, or "help" cries are detected, environmental risk weights are added to generate a risk index of 0-10, with level 0 being the lowest and level 10 being the highest, and the index is stored synchronously on the blockchain.

[0193] Emergency communication is triggered based on the risk assessment results. Emergency communication includes active and passive modes. In active mode, when a trapped person presses and holds the one-button distress call, a distress message is immediately generated, which includes real-time location, risk index, vital signs snapshot, and timestamp. The message is then up-converted to satellite and shortwave frequencies via a radio frequency module, or relayed via a ground-based mesh network and drones. In passive mode, if the risk index is ≥7 or if environmental sensors detect danger, the entire network broadcast mode is automatically activated without manual intervention. An emergency signal containing the location is sent to nearby terminals within a 50-meter radius, requesting relay to the emergency command center.

[0194] Furthermore, when an emergency communication is triggered, latitude and longitude information is output in real time. In open environments, positioning with an accuracy of ≤1.5 meters can be achieved directly through the BeiDou-3 system. In obstructed areas, positioning is supplemented by base station signals, RSSI relayed by drones, or satellite short messages to correct position deviations. At the same time, positioning information is transmitted synchronously with the distress signal.

[0195] When the trapped terminal is in low-power mode, the rescue terminal sends a wake-up signal at a specific frequency, and the remote wake-up module receives and identifies the signal.

[0196] After verifying the legitimacy of the wake-up signal, the trapped terminal switches from low-power mode to normal working mode, restores sensor monitoring and communication functions, and actively transmits the latest status data back to the rescue terminal.

[0197] Specifically, the sensors automatically activate and complete self-tests and parameter initialization. The three types of sensors are specifically configured with sampling frequencies, detection thresholds, and initialization parameters to ensure rapid entry into a stable working state after startup, avoiding data acquisition delays due to insufficient equipment preparation and providing a reliable data source for subsequent analysis. A parallel acquisition and fusion analysis mechanism for vital signs and environmental data generates a 0-10 level risk index by superimposing environmental weights on basic risk values, comprehensively reflecting the real-time status of trapped personnel. Blockchain storage ensures data immutability, providing an objective basis for risk assessment and avoiding misjudgments caused by a single data dimension. Emergency communication employs both active and passive modes. The active mode meets the needs of trapped personnel for self-calling for help, while the passive mode is automatically triggered in high-risk situations without manual operation, ensuring timely response in dangerous scenarios. Multi-band transmission and relay mechanisms combine to overcome terrain limitations and ensure effective transmission of distress signals. Positioning accuracy adapts to different environments. In open areas, BeiDou-3 achieves high-precision positioning of ≤1.5 meters, while in obstructed areas, multi-source signal fusion corrects deviations, providing precise coordinates for rescue and reducing the blindness of search and rescue efforts. The remote wake-up function can activate low-power terminals, restore communication and monitoring, avoid loss of connection due to device hibernation, improve the success rate of rescue, and ultimately form a full-chain emergency support of "monitoring-assessment-rescue-location-wake-up".

[0198] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0199] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A wireless network communication system based on an emergency module, characterized in that, It includes a terminal trunking unit, a multi-dimensional relay network unit, an emergency command unit, a dynamic spectrum management unit, and a security authentication unit. The terminal cluster unit is used to: facilitate data exchange between two types of terminals using wireless communication components; The multi-dimensional relay network unit is used to: construct multi-dimensional communication links in the air, on the ground, and in space. The two types of terminal clusters serve as the access starting point for the multi-dimensional communication links. At the same time, the multi-dimensional communication links provide hierarchical communication support for the two types of terminals. The emergency command unit is used to: receive data transmitted by the two types of terminals using a multi-dimensional communication link, analyze the received data, and send instructions to the two types of terminals based on the analysis results; The dynamic spectrum management unit is used to perform frequency band analysis and selection for two types of terminals and nodes in multi-dimensional communication links. The security authentication unit is used to encrypt the transmitted data.

2. The wireless network communication system based on an emergency module according to claim 1, characterized in that, The terminal cluster unit is also used for: The two types of terminals include rescue terminals and trapped terminals, which have the same type and function; Furthermore, the rescue terminal and the trapped terminal connect to external relay equipment to extend the communication range; Multi-dimensional relay network units are also used for: The multi-dimensional relay network consists of base stations, drones, and satellites. Drones serve as aerial relays to extend coverage, satellites enable long-distance signal backhaul, and base stations provide stable regional communication support. The ground-based multi-dimensional communication link is constructed as follows: the rescue terminal and the trapped terminal automatically start the ground Mesh self-organizing network through the wireless networking module. The rescue terminal and the trapped terminal achieve short-range data interaction through multi-hop routing, forming the basic link for ground communication. Furthermore, the rescue terminal and the trapped terminal actively access the fixed or temporarily deployed base station through the base station communication protocol, and use the regional coverage capability of the base station to enhance the stability and transmission distance of the ground link. The base station, as the core node on the ground, aggregates terminal data within the region. The multi-dimensional communication link in the air is constructed as follows: the emergency command center dispatches drones to take off according to the terrain of the rescue area. The drones start their own wireless communication modules and automatically enter the air relay mode. At the same time, the drones adapt to the communication protocols of ground terminals or base stations through software-defined radio technology and establish wireless connections with terminals or base stations in the ground Mesh network, becoming relay nodes for the ground link to extend into the air. The multi-dimensional communication link in space is constructed as follows: ground terminals, base stations, or drones actively scan and lock onto satellite signals through satellite antennas, use up-conversion function to modulate data signals to satellite communication frequency bands, establish communication connection with satellites, and after receiving signals from terminals, drones, or base stations, satellites transmit data back to the emergency command center through inter-satellite links or ground gateway stations. Furthermore, it adapts to LoRaWAN, 5G NR, and satellite protocols through software-defined radio technology; Multi-hop routing is optimized using the improved AODV / OLSR protocol.

3. A wireless network communication system based on an emergency module according to claim 2, characterized in that, The emergency command unit is also used for: The received transmitted data includes vital signs data, location and distress call data, environmental monitoring data, terminal status data, and blockchain storage data; The received data is prioritized for rescue operations. First, the data is classified according to a risk index. Risk index classification involves matching the received data to risk levels based on the risk index. Risk matching involves classifying the received data into high-risk, medium-risk, and low-risk categories. If the received environmental monitoring data contains information about hazardous gas leaks or severe vibrations, its priority will be increased even if the risk index is low; conversely, if the environment is stable and the risk index does not worsen, the original level can be maintained. At the same time, the priority is bound to the location information of the two types of terminals to confirm the specific location of the trapped personnel with high priority and mark it on the rescue map; Rescue resources are retrieved based on the determined rescue priority. First, information on current rescue resources is collected, including the location and status of nearby rescue terminals, the real-time location and coverage of drones, the deployment area of ​​ground rescue teams, and the communication coverage capabilities of base stations and relay nodes. Then, based on the location of high-priority trapped personnel, the nearest rescue terminal or drone is dispatched to the target area. If the trapped personnel are in a communication dead zone, deploy drones to expand aerial coverage and establish temporary communication links; Finally, the rescue terminal completes the rescue data analysis and sends rescue commands.

4. A wireless network communication system based on an emergency module according to claim 3, characterized in that, The dynamic spectrum management unit is also used for: Fast Fourier Transform is used to analyze the occupancy status of the channel in two types of terminals and in multidimensional communication links, and clean frequency bands with a signal-to-noise ratio ≥20dB are selected first. The process begins by using two types of terminals to scan the full-band wireless signals within the coverage area in real time, capturing open-circuit radio waves in each band and converting them into electrical signals. The converted electrical signals are then preprocessed, and the preprocessed time-domain signals are converted into frequency-domain signals to obtain the power distribution spectrum of each frequency component. Based on the power distribution spectrum, it is determined whether the channel is occupied. Based on the power distribution spectrum, a frequency band with no obvious signal is selected as a reference, and the average noise power of the area is calculated. Then, based on the power distribution spectrum, the ratio of the signal power to the noise floor of the unoccupied channels is calculated, and the result is converted to decibels. Finally, a frequency band with a signal-to-noise ratio ≥ 20 dB is selected as the final clean frequency band. At the same time, the frequency band selection is dynamically optimized by combining convolutional neural networks and Q-Learning algorithms; Among them, for the selected clean frequency bands, the historical occupancy patterns are analyzed in real time using convolutional neural networks, and the long-term availability of the frequency bands is dynamically evaluated using the Q-Learning algorithm. Finally, the frequency band with SNR≥20dB, the least interference, and the highest stability is selected as the current communication frequency band.

5. A wireless network communication system based on an emergency module according to claim 4, characterized in that, The security authentication unit is also used for: All transmitted data is encrypted using the national cryptographic encryption algorithm. Specifically, when two types of terminals generate data to be transmitted, the national cryptographic encryption algorithm is automatically activated to encrypt the entire data and form an encrypted data packet. Simultaneously, a dynamic sharded blockchain key management mechanism is integrated, in which a global encryption key is dynamically generated based on the location of two types of terminals, network topology, and current timestamp. The generated key is split into multiple independent shards according to preset rules, and each shard contains only part of the key information. The key fragments are stored in regional master nodes. The split key fragments are distributed to the regional master nodes for storage through a secure channel. The selection of regional master nodes is based on the principle of geographical proximity, and each master node stores only 1-2 fragments. The verification is performed through the PBFT consensus protocol. After receiving the key fragment, the regional master node initiates the PBFT consensus protocol for verification. The verification process is as follows: the master nodes exchange fragment information with each other and check the integrity and consistency of the fragments. If more than 2 / 3 of the master nodes confirm that the fragment is valid, the fragment storage is deemed to be legal. If the verification fails, the key fragment regeneration and distribution process is triggered until all fragments pass the consensus. Then, the two types of terminals are divided into sub-chains using geographic sharding technology. Specifically, based on the real-time location information of the two types of terminals, the rescue terminal and the trapped terminal are divided into different sub-chains using geographic sharding technology. The division process is as follows: the sub-chain boundaries are divided according to the rescue area, and terminals in the same area are assigned to the same sub-chain. Furthermore, the sub-chain independently manages the key exchange and data encryption of the local terminal. It combines BLS aggregated signature for cross-chain synchronization with a latency of ≤50ms. Specifically, when terminals of different sub-chains need to communicate, the cross-chain synchronization mechanism is activated. The cross-chain synchronization mechanism is as follows: each sub-chain node generates a signature containing local key fragmentation information, and the multi-sub-chain signatures are aggregated into a unified signature through BLS aggregated signature technology. Furthermore, the synchronization process controls the latency to ≤50ms by optimizing the transmission path. When the encrypted data packet is transmitted, each node calls the locally stored key fragment for real-time verification as it passes through the node. Finally, all data is securely encrypted.

6. An emergency communication and security terminal based on an emergency module, applied in a wireless network communication system based on an emergency module as described in claims 1-5, characterized in that, It includes an expansion unit, a radio frequency unit, a baseband unit, an emergency unit, and a wireless networking unit; The expansion unit is used to: capture open-circuit radio waves and convert them into electrical signals for output; The radio frequency unit is used for: energy normalization, modulation and demodulation, and anti-interference processing of the converted electrical signals; The baseband unit is used for: digitizing, synchronizing, and extracting content from the processed electrical signals; The wireless networking unit is used for: data exchange between the two types of terminals and other terminals in the wireless ad hoc network; The emergency unit is used for: multi-sensor collaborative monitoring of vital signs and the environment, and for emergency communication, location tracking, and remote wake-up.

7. An emergency communication and security terminal based on an emergency module according to claim 6, characterized in that, The expansion unit is further configured to: It integrates multiple antennas and corresponding decoders, including FM, AM, UWB, WiFi, Bluetooth, ZigBee, LoRa, NB-IoT and satellite antennas; The captured open-circuit radio waves are converted into electrical signals and then input to the radio frequency unit; It also supports dynamic spectrum sensing, which automatically switches to the optimal frequency band based on the channel status. It can also be expanded to connect gas sensors and microphone arrays; When environmental anomalies, hazardous gases, or specific voices are detected, the corresponding communication mode switch is triggered. The radio frequency unit is also used for: After receiving the electrical signal from the expansion unit, the electrical signal first enters the preamplifier to amplify the weak signal and enhance the signal strength. If the signal is too strong, the attenuator is activated to reduce the signal power, and the signal strength is controlled within a preset range through dynamic balance between amplification and attenuation. The system will monitor the energy fluctuations of electrical signals within a preset range in real time and, in conjunction with a preset standard energy threshold, automatically adjust the operating parameters of the intermediate frequency amplifier and attenuator. If the signal energy is below the threshold, continue to fine-tune the amplification; If the signal exceeds the threshold, an attenuation operation is performed to bring the electrical signal within the standard range. Stray signals outside the standard range of electrical signal frequency bands are filtered out, and the filtered electrical signals are frequency-converted according to the signal transmission direction. The frequency-converted electrical signal is filtered to remove narrowband interference in the intermediate frequency range; If a sudden pulse interference is detected, the pulse suppression circuit is activated to temporarily block the signal during the interference period; Finally, the anti-interference processing of the electrical signal is completed.

8. An emergency communication and security terminal based on an emergency module according to claim 7, characterized in that, The baseband unit is also used for: After receiving the processed electrical signal, preprocessing is performed. The preprocessing is as follows: first, the electrical signal is filtered twice. The second filtering is to filter out the high-frequency noise or clutter remaining after radio frequency processing, and retain the target low-frequency signal. Simultaneously, the signal strength is monitored in real time, and if the signal is too weak, the gain is automatically increased to enhance the signal. If the signal is too strong, reduce the gain; The preprocessed electrical signal is digitally converted into a discrete digital signal using a high-precision analog-to-digital converter. The digitized electrical signal undergoes synchronization processing, which includes carrier synchronization, symbol synchronization, and frame synchronization. Carrier synchronization involves locking the carrier frequency of the signal using a signal tracking loop to eliminate residual frequency deviations after radio frequency processing, and simultaneously confirming whether the local carrier frequency matches the carrier frequency of the received signal. Symbol synchronization uses OFDM-related symbol synchronization algorithms to align the symbol boundaries of the digital signal. Frame synchronization identifies the frame header identifier in the signal to determine the start position of the data frame. Content extraction and parsing are performed on the synchronized electrical signals. Content extraction and parsing include audio content extraction and data content extraction. Audio content extraction involves decoding the digital signals to restore the speech signals, and then removing background noise through noise reduction processing. Data content extraction involves parsing the non-audio signals, removing redundant information from the digital signals, extracting key data fields, and converting them into a recognizable format. The extracted content of audio content extraction and data content extraction is validated, and invalid or erroneous information is removed; Finally, the extracted content that has been verified is packaged and organized to obtain a valid data packet.

9. An emergency communication and security terminal based on an emergency module according to claim 8, characterized in that, The wireless networking unit is also used for: After both types of terminals are started, the heartbeat module is automatically activated, and broadcast signals containing the terminal's unique identification code, device status, and location information are periodically sent. After a nearby terminal captures the broadcast signal through a wireless receiving unit, it extracts the feature identification code and compares it with the locally stored identification code database to complete the identity verification. After successful verification, both parties record each other's device identifiers, signal strengths, and relative locations, and establish a neighbor relationship. After neighbor relationships are established, a self-organizing mesh network is constructed according to the improved AODV / OLSR protocol; If the distance between the two types of terminals and their neighboring terminals is ≤500 meters and the signal is stable, a point-to-point communication link is directly established as a direct node of the network; if the distance between the two types of terminals and their neighboring terminals exceeds the direct communication range, the discovered neighboring terminals are used as relay nodes, and a multi-hop routing mechanism is adopted to form a multi-hop link between the terminal, relay terminal, and target terminal. When two types of terminals interact with nearby neighboring terminals, the data is first encapsulated in a preset format to form a data frame. The national cryptographic encryption algorithm is then used to encrypt the data frame, and a checksum is added to the encrypted data frame. The encrypted data is transmitted. If the receiving terminal is a direct neighbor, the data frame is sent directly through the point-to-point link. If the receiving terminal is not a direct neighbor, the local routing table is queried to select a relay path with fewer hops and higher link quality, and the data frame is forwarded to the first-hop relay terminal. Furthermore, data interaction is transmitted using the RTP / RTCP protocol, and audio and video streams are synchronized using SR data packet timestamps. If link congestion is detected, the sending frequency of non-critical data is automatically reduced, and non-critical data is low-priority status information. Ultimately, this completes the data interaction between the two types of terminals and other terminals.

10. An emergency communication and security terminal based on an emergency module according to claim 9, characterized in that, The emergency unit is also used for: After both types of terminals are started, all integrated sensors are automatically activated, and self-testing and parameter initialization are completed. The sensors include vital sign sensors, environmental monitoring sensors, and positioning and communication auxiliary sensors. The vital sign sensors are PPG photoplethysmography sensors, triaxial accelerometers, and infrared thermometry modules, and the sampling frequency is set after startup. The environmental monitoring sensors are gas sensors, temperature and humidity sensors, and microphone arrays, and the detection threshold is set after startup. The positioning and communication auxiliary sensors are Beidou positioning modules, remote wake-up modules, and one-button emergency call circuits, and satellite signal search initialization and wake-up signal reception frequency band calibration are completed after startup. Vital signs sensors collect vital signs parameters in real time, while environmental monitoring sensors work in parallel with vital signs sensors to capture environmental conditions from all angles. The collected vital signs data are fused and analyzed with environmental data. The fusion analysis calculates the basic risk value of vital signs data based on heart rate variability, body temperature deviation, and continuous rest duration. If dangerous gas leaks, violent vibrations, and "help" cries are detected, environmental risk weights are added to generate a risk index of 0-10, with level 0 being the lowest and level 10 being the highest, and the index is stored synchronously on the blockchain. Emergency communication is triggered based on the risk assessment results. Emergency communication includes active and passive modes. In active mode, when a trapped person presses and holds the one-button distress call, a distress message is immediately generated, which includes real-time location, risk index, vital signs snapshot, and timestamp. The message is then up-converted to satellite and shortwave frequencies via a radio frequency module, or relayed via a ground-based mesh network and drones. In passive mode, if the risk index is ≥7 or if environmental sensors detect danger, the entire network broadcast mode is automatically activated without manual intervention. An emergency signal containing the location is sent to nearby terminals within a 50-meter radius, requesting relay to the emergency command center. When an emergency communication is triggered, latitude and longitude information is output in real time. In open environments, positioning accuracy of ≤1.5 meters is achieved through the BeiDou-3 system. In obstructed areas, positioning is supplemented by base station signals, RSSI relayed by UAVs, or satellite short messages to correct position deviations. At the same time, positioning information is transmitted synchronously with the distress signal. When the trapped terminal is in low-power mode, the rescue terminal sends a wake-up signal at a specific frequency, and the remote wake-up module receives and identifies the signal. After verifying the legitimacy of the wake-up signal, the trapped terminal switches from low-power mode to normal working mode, restores sensor monitoring and communication functions, and actively transmits the latest status data back to the rescue terminal.

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