A layered heterogeneous situation distribution method and system that disengages from ground infrastructure

Abstract

The application discloses a layered heterogeneous situation distribution method and system which is separated from ground infrastructure. The method comprises the following steps: detecting whether the current network environment is separated from the ground mobile communication infrastructure; if yes, starting the layered heterogeneous situation distribution mode, the individual situation terminal detecting the reachability of the vehicle-mounted micro server and adaptively selecting the communication mode; if reachable, obtaining the regional situation information from the vehicle-mounted micro server as the regional sink node through the radio network and returning the local situation information, if unreachable, synchronizing with the surrounding individual situation terminal; the vehicle-mounted micro server receiving the wide-area situation information through the low-orbit satellite internet, performing the core / auxiliary hierarchical caching, and carrying the synchronization reference information in the synchronous response for the terminal to calibrate the incremental reference; if the ground infrastructure is restored, switching back to the normal network mode and removing the redundant fusion report. The application realizes the continuous sharing and cooperation of the situation information of the class-level tactical unit under the condition of being separated from the ground infrastructure.

Description

Technical Field

[0001] This invention relates to the field of military communication and situational awareness technology, and in particular to a hierarchical heterogeneous situational awareness distribution method and system that is independent of ground infrastructure. Background Technology

[0002] In modern tactical collaborative operations and emergency communications, real-time sharing of situational information is crucial for ensuring coordinated actions among various combat units. Existing situational information distribution systems typically rely on terrestrial mobile communication infrastructure (such as 4G / 5G base stations and wired internet access points) for information transmission, with each terminal interacting and synchronizing situational information by accessing the terrestrial network.

[0003] However, in battlefield environments and emergency communications during natural disasters, terrestrial mobile communication infrastructure may fail due to damage, electromagnetic interference, or insufficient geographical coverage, preventing combat units from accessing the terrestrial network and leaving them in an information silo. In such cases, existing situational awareness distribution schemes that rely on terrestrial infrastructure will become completely ineffective.

[0004] To address communication needs in the absence of infrastructure, existing technologies have proposed the following alternatives:

[0005] The first category is satellite communication situational awareness distribution schemes. These schemes utilize satellite communication links for long-distance transmission of situational information, such as broadcasting tactical information to the ground via geostationary or low-Earth orbit satellites equipped with tactical data link terminals. However, these schemes are mostly point-to-point backhauls or broadcast transmissions, lacking regional aggregation and distribution mechanisms for squad-level tactical units, and failing to effectively complement short-range ground communication methods.

[0006] The second category is infrastructure-free self-organizing network solutions. These solutions employ self-organizing network technology, allowing nodes to autonomously build a network and achieve short-range communication without pre-deployed infrastructure. However, such solutions are typically limited to a single network architecture, lack the ability to integrate with wide-area satellite networks, cannot achieve cross-regional situational information synchronization, and all nodes in the network are of equal status, without clearly defining the role and function of regional aggregation nodes.

[0007] The third category is vehicle-mounted communication system solutions. Existing vehicle-mounted communication equipment is typically used as a mobile relay or command terminal to maintain communication during maneuvers. However, existing vehicle-mounted systems do not fully utilize their role in situational awareness aggregation and distribution in offline scenarios, especially after deployment, where the situational awareness coordination mechanism between the vehicle-mounted system and individual soldier terminals is inadequate.

[0008] Low-Earth orbit (LEO) satellite internet (such as LEO satellite constellation communication systems) has the advantages of low latency, high bandwidth, and miniaturized terminals compared to high-Earth orbit (HEO) satellites. However, its links suffer from problems such as inter-satellite handover, blockage interruption, and bandwidth fluctuation. If it is only used as a simple replacement for traditional satellite links, it is difficult to meet the requirements of squad-level tactical units for the continuity and reliability of situational awareness distribution under offline conditions.

[0009] Therefore, there is an urgent need for a heterogeneous situational awareness distribution scheme that can simultaneously utilize wide-area satellite networks and short-range radio networks, possess regional convergence and hierarchical distribution capabilities, and adapt to the dynamic changes in the status of individual soldier terminals when they are not on ground infrastructure, in order to ensure the continuity of situational awareness for squad-level tactical units in complex environments. Summary of the Invention

[0010] This invention aims to provide a hierarchical heterogeneous situational awareness distribution method and system that is independent of ground infrastructure, in order to solve the technical problems in the prior art, such as reliance on ground infrastructure, lack of regional aggregation nodes, insufficient integration of heterogeneous networks, and inconsistent incremental synchronization benchmarks in a distributed environment without network access.

[0011] To achieve the above objectives, this invention provides a hierarchical heterogeneous situational awareness distribution method that is independent of ground infrastructure, applied to a tactical communication system including a vehicle-mounted microserver and a soldier's situational awareness terminal, comprising the following steps:

[0012] S1. Detect whether the current network environment is disconnected from the terrestrial mobile communication infrastructure;

[0013] S2. When the system detects separation from the ground mobile communication infrastructure, a hierarchical heterogeneous situational awareness distribution mode is activated. The individual soldier situational awareness terminal detects the currently available communication networks and the reachability of the vehicle-mounted micro-server, and adaptively selects the communication mode in the following manner:

[0014] If the individual soldier situation terminal is in a vehicle-mounted state and the vehicle-mounted micro server is reachable, then the individual soldier situation terminal accesses the low-orbit satellite internet through the vehicle-mounted micro server.

[0015] If the individual soldier situation terminal is in an unloaded state and the vehicle-mounted micro server is reachable, the individual soldier situation terminal establishes a communication connection with the vehicle-mounted micro server through a radio network, obtains regional situation information from the vehicle-mounted micro server, and transmits the newly obtained local situation information back to the vehicle-mounted micro server through the radio network.

[0016] If the individual soldier situation terminal is in an off-vehicle state and the vehicle-mounted micro server is unreachable, the individual soldier situation terminal switches to radio network mode to synchronize situation information with other individual soldier situation terminals in the vicinity.

[0017] S21. The vehicle-mounted microserver accesses the wide area network via a low-orbit satellite internet, receives wide-area situation information, performs hierarchical processing on the received wide-area situation information, divides it into core situation information and auxiliary situation information, caches the core situation information in full, selectively caches the auxiliary situation information, and acts as a regional aggregation node to locally maintain the hierarchically cached situation information; the vehicle-mounted microserver aggregates the received local situation information into its local cache and transmits it to the wide area network via the low-orbit satellite internet.

[0018] S22. The individual soldier situation terminal sends a situation synchronization request to the vehicle-mounted micro server. The situation synchronization request includes the latest timestamp of the situation information cached by the individual soldier situation terminal. The vehicle-mounted micro server carries synchronization reference information in the synchronization response. The individual soldier situation terminal calibrates the local incremental reference according to the synchronization reference information. The vehicle-mounted micro server filters the incremental situation information according to the latest timestamp, prioritizes sending the core situation information to the individual soldier situation terminal, and then selectively sends the auxiliary situation information according to the current channel quality of the radio network.

[0019] S23. The individual soldier situation terminal periodically broadcasts the newly acquired situation information it has acquired to other individual soldier situation terminals in the vicinity, receives the newly acquired situation information broadcast by other individual soldier situation terminals in the vicinity, compares it with the local cache, and merges it after conflict resolution according to the preset fusion rules; when the vehicle-mounted micro server recovers from being unreachable to being reachable, the individual soldier situation terminal performs incremental synchronization in step S22 to the vehicle-mounted micro server.

[0020] S3. When the connection to the terrestrial mobile communication infrastructure is restored, switch to normal network mode and transmit situational information through the terrestrial mobile communication infrastructure.

[0021] Optionally, the core situation information includes target location coordinates, target identifier, and timestamp, and has the characteristics of data volume less than a first threshold and update frequency higher than a second threshold; the auxiliary situation information includes one or more of the following: target detailed attributes, historical trajectory points, and media data, and has the characteristics of data volume greater than or equal to the first threshold or update frequency less than or equal to the second threshold; the selective caching includes: selectively caching the auxiliary situation information according to the remaining cache capacity and the timeliness threshold of the situation information, and prioritizing the elimination of the auxiliary situation information when the cache capacity is insufficient or the information expires.

[0022] Optionally, the channel quality is determined based on one or a combination of the received signal strength, signal-to-noise ratio, available bandwidth, transmission delay, and packet loss rate of the radio network; the step of selectively sending the auxiliary situation information based on the current channel quality of the radio network includes: comparing the channel quality with a preset quality threshold; when the channel quality is higher than the preset quality threshold, appending the auxiliary situation information to the sent message; when the channel quality is lower than the preset quality threshold, only the core situation information is sent, the core situation information has a sending priority over the auxiliary situation information, and the auxiliary situation information is reserved for subsequent synchronization after the channel quality is improved or sent according to the on-demand request of the individual soldier situation terminal.

[0023] Optionally, the synchronization reference information includes one or both of a reference time and a synchronization sequence number; the individual soldier situation terminal calibrates the local incremental reference based on the synchronization reference information, including: the individual soldier situation terminal uses the synchronization reference information issued by the vehicle-mounted microserver at the most recent synchronization as a reference, compares the version identifier of the locally cached situation information with the reference, and generates the latest timestamp carried in subsequent situation synchronization requests; when there is a deviation between the local clock of the individual soldier situation terminal and the vehicle-mounted microserver, the local recorded time identifier is calculated using the synchronization reference information.

[0024] Optionally, the preset fusion rules include: when there are multiple situation records for the same target identifier, the latest one is retained according to the synchronization reference information corresponding to each situation record; and / or, according to the node priority or credibility of the individual soldier situation terminal of the broadcast source, the situation record broadcast by the individual soldier situation terminal with higher node priority or higher credibility is retained.

[0025] Optionally, the method further includes priority access control: the vehicle-mounted micro server allocates uplink backhaul bandwidth and downlink bandwidth to each individual soldier situation terminal based on one or more of the role level, remaining power, and link quality of each connected individual soldier situation terminal.

[0026] Optionally, when the connection to the ground mobile communication infrastructure is restored, the individual soldier situation terminal and the vehicle-mounted micro server perform a deduplication comparison between the situation information that has not yet been uploaded in the local cache and the situation information on the ground network side, and then merge and report it.

[0027] To achieve the above objectives, the present invention also provides a hierarchical heterogeneous situational awareness distribution system that is independent of ground infrastructure, comprising: a vehicle-mounted microserver configured with a low-Earth orbit satellite internet access module, a situational awareness caching module, and a radio distribution module; the vehicle-mounted microserver is used to receive wide-area situational awareness information through the low-Earth orbit satellite internet access module when disconnected from ground mobile communication infrastructure, to perform hierarchical processing and local caching of the wide-area situational awareness information through the situational awareness caching module, to distribute regional situational awareness information to individual soldier situational awareness terminals through the radio distribution module, and to integrate the local situational awareness information received from individual soldier situational awareness terminals into the local cache and transmit it via the low-Earth orbit satellite internet; the individual soldier situational awareness terminal is configured with a radio network access module. The system comprises a block, a low-Earth orbit satellite internet access module, and a network selection module. The individual soldier situational awareness terminal, when disconnected from the terrestrial mobile communication infrastructure, detects the availability of current communication networks and the reachability of the vehicle-mounted microserver. The network selection module adaptively selects between the following modes: In vehicle-mounted mode and when the vehicle-mounted microserver is reachable, it accesses the low-Earth orbit satellite internet via the vehicle-mounted microserver; in dismounted mode and when the vehicle-mounted microserver is reachable, it obtains regional situational information from the vehicle-mounted microserver via the radio network access module and transmits back local situational information; in dismounted mode and when the vehicle-mounted microserver is unreachable, it synchronizes its situational awareness with other nearby individual soldier situational awareness terminals via the radio network access module.

[0028] The present invention has the following beneficial effects:

[0029] First, by using a vehicle-mounted micro-server as a regional aggregation node, it achieves regional caching and distribution of wide-area situational information under offline conditions, and supports a two-way closed loop of downlink intelligence distribution and uplink intelligence backhaul, solving the problem of situational acquisition and backhaul when individual soldier terminals cannot directly access the wide-area satellite network or when the access is unstable.

[0030] Second, by integrating low-orbit satellite internet and radio networks in a hierarchical and heterogeneous manner, the complementary nature of wide-area coverage and local access is achieved, ensuring the continuity of situational awareness for squad-level tactical units when they are disconnected from ground infrastructure.

[0031] Third, by using a hierarchical caching and incremental synchronization mechanism for situational information, as well as a core / auxiliary hierarchical transmission based on channel quality, the transmission load of the radio network is effectively reduced, and the situational synchronization efficiency under narrowband channel conditions is improved.

[0032] Fourth, by using a synchronization reference information calibration mechanism, the problems of incremental synchronization misjudgment and mutual synchronization fusion errors caused by terminal clock drift in offline distributed environments are solved, ensuring the correctness of the judgment of "which is newer or older" in cross-terminal situation records.

[0033] Fifth, through the network adaptive selection of the individual soldier situation terminal, automatic switching between vehicle-mounted / dismounted / unreachable states and dynamic adaptation of communication modes are realized, which improves the system's adaptability in complex tactical environments. Attached Figure Description

[0034] Figure 1 A flowchart illustrating the hierarchical heterogeneous situational awareness distribution method detached from ground infrastructure provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the hierarchical heterogeneous situation distribution system provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram illustrating the process of hierarchical caching and incremental synchronization of situational information provided in an embodiment of the present invention;

[0037] Figure 4 This is a logical schematic diagram of the adaptive selection of the individual soldier situation terminal network provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram illustrating the fusion of synchronous reference calibration and mutual synchronization in an offline environment, as provided in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Example 1: A hierarchical heterogeneous situational awareness distribution method detached from ground infrastructure

[0041] Figure 1 This is a flowchart illustrating a hierarchical heterogeneous situational awareness distribution method detached from ground infrastructure, provided in an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0042] Step S101: Detect whether the current network environment is disconnected from the terrestrial mobile communication infrastructure.

[0043] After the tactical communication system is activated, it continuously monitors whether the current network environment allows access to terrestrial mobile communication infrastructure (such as 4G / 5G base stations and wired internet access points). Detection methods include: attempting to send probe packets to known terrestrial network addresses, detecting cellular network signal strength, and detecting wired network link status. If the probe is successful and the signal quality meets communication requirements, it is determined that the system is currently in a normal network environment; if the probe fails or the signal quality is below the usable threshold, it is determined that the system has lost access to terrestrial mobile communication infrastructure.

[0044] Step S102: Activate the hierarchical heterogeneous situational awareness distribution mode and perform network adaptive selection.

[0045] When the system determines that it has disconnected from the terrestrial mobile communication infrastructure, it automatically initiates a hierarchical heterogeneous situational awareness distribution mode. This mode employs a three-layer architecture: the wide-area layer is carried by low-Earth orbit satellite internet, the aggregation layer is handled by vehicle-mounted microservers, and the access layer is covered by a radio network.

[0046] The individual soldier situational awareness terminal detects the currently available communication network and the reachability of the vehicle-mounted microserver (e.g., determining reachability by detecting message responses via radio links), and adaptively selects the communication mode in the following manner:

[0047] Vehicle-mounted status: When the individual soldier situation terminal is in vehicle-mounted status and the vehicle-mounted micro server is reachable, it accesses the low-orbit satellite internet through the vehicle-mounted micro server to directly obtain wide-area situation information, and transmits newly discovered situation information locally back to the wide area network through the vehicle-mounted micro server;

[0048] Disembarkation reachable status: After the individual soldier situation terminal is disembarked and deployed, it attempts to establish a radio network connection with the vehicle-mounted micro server. After the connection is successful, it obtains regional situation information through the vehicle-mounted micro server and transmits the local situation information back to the vehicle-mounted micro server.

[0049] Unreachable after disembarking: When the radio link between the individual soldier situation terminal and the vehicle-mounted micro server is interrupted (e.g., due to excessive distance or terrain obstruction), it automatically switches to radio network mode and only synchronizes situation with other individual soldier situation terminals in the vicinity to ensure that the situation within the squad is not interrupted.

[0050] Status switchback: When the individual soldier situation terminal approaches the vehicle-mounted micro server again during the mission, the network selection module automatically detects and switches back to the mode of communicating with the vehicle-mounted micro server, and performs incremental situation synchronization to ensure that the local cache is consistent with the regional aggregation node.

[0051] Step S103: The vehicle-mounted micro server receives wide-area situational information and performs hierarchical caching.

[0052] The vehicle-mounted micro server is equipped with a low-orbit satellite internet access module (such as a low-orbit satellite internet user terminal), which can access the wide area network via low-orbit satellite internet when offline, and continuously receive wide area situation information from higher command nodes or neighboring units.

[0053] The vehicle-mounted microserver, acting as a regional aggregation node, performs hierarchical processing on the received wide-area situational information: fields with small data volume, high update frequency, and high tactical value, such as target location coordinates, target identifiers, and timestamps, are identified as core situational information and are fully cached; media data such as target detailed attributes, historical trajectory points, and image thumbnails are identified as auxiliary situational information and are selectively cached based on the remaining cache capacity and timeliness threshold. When the cache capacity is insufficient or the information expires, the auxiliary situational information is prioritized for elimination.

[0054] Step S104: Incremental synchronization between the individual soldier situation terminal and the vehicle-mounted micro server.

[0055] The individual soldier situational awareness terminal sends a situational awareness synchronization request to the vehicle-mounted microserver. This request includes the latest timestamp of the situational awareness information cached locally by the individual soldier situational awareness terminal. Considering the potential clock drift between terminals in an offline distributed environment, the vehicle-mounted microserver carries synchronization reference information (reference time and / or monotonically increasing synchronization sequence number) in its synchronization response. The individual soldier situational awareness terminal uses the most recently transmitted synchronization reference information as the incremental reference to recalculate and adjust the locally recorded time stamp, thereby ensuring the consistency of subsequent incremental comparisons.

[0056] The vehicle-mounted microserver filters incremental situational awareness records added since the last synchronization based on the latest timestamp, prioritizing the inclusion of core situational awareness information during encapsulation. Simultaneously, it assesses the current radio network channel quality (one or a combination of received signal strength, signal-to-noise ratio, available bandwidth, transmission delay, and packet loss rate). When the channel quality is higher than a preset quality threshold, auxiliary situational awareness information is appended to the sent message; when the channel quality is lower than the preset quality threshold, only core situational awareness information is sent, with auxiliary situational awareness information reserved for subsequent synchronizations after channel quality improvement or sent on demand based on requests from individual soldier situational awareness terminals. Core situational awareness information always has a higher sending priority than auxiliary situational awareness information.

[0057] Step S105: Inter-synchronization and integration between individual soldier situation terminals.

[0058] During periods when the individual soldier situation terminal cannot access the vehicle-mounted micro-server, each individual soldier situation terminal periodically broadcasts newly acquired situational information to other surrounding individual soldier situation terminals. Simultaneously, it receives information broadcast from surrounding terminals, compares it with its local cache, and merges the information after conflict resolution according to preset fusion rules. These preset fusion rules include: when multiple situational records exist for the same target identifier, the latest record based on the synchronization reference information is retained; and / or, based on the node priority or credibility of the broadcasting individual soldier situation terminal, the situational record broadcast by the terminal with higher node priority or credibility is retained. This mechanism enables rapid dissemination and consistency maintenance of situational information within the squad, and prevents cache pollution due to clock drift or duplicate broadcasts.

[0059] Step S106: Local situation information backhaul and wide-area uphaul.

[0060] The individual soldier situational awareness terminal transmits newly acquired local situational awareness information during the mission back to the vehicle-mounted micro server via the radio network; the vehicle-mounted micro server merges the received local situational awareness information into its local cache, combines it with the wide-area situational awareness information received via the low-orbit satellite internet, and transmits it to the wide-area network via the low-orbit satellite internet, realizing a two-way closed loop of "downlink distribution and uplink aggregation" of the regional aggregation node.

[0061] Step S107: Mode switching and integration reporting after restoration of ground infrastructure.

[0062] When the system detects that the ground mobile communication infrastructure has been restored to availability, it automatically switches back to the normal network mode, and each terminal transmits situational information through the ground mobile communication infrastructure. At the same time, the individual soldier situational terminal and the vehicle-mounted micro server perform deduplication comparison between the situational information that has not yet been uploaded in the local cache and the situational information on the ground network side, and then merge and report it to avoid duplicate intelligence uploads, and maintain the hierarchical heterogeneous situational distribution mode as a backup mechanism.

[0063] Example 2: Hierarchical caching and incremental synchronization of situational information

[0064] Figure 3 This is a schematic diagram illustrating the process of hierarchical caching and incremental synchronization of situational information provided in an embodiment of the present invention. Figure 3 As shown:

[0065] Tiered caching: Core situational information (location coordinates, target identifiers, timestamps) is cached in full; auxiliary situational information (detailed attributes, trajectory points, media data) is selectively cached based on capacity and timeliness, with priority given to auxiliary information when it is evicted. Example of tiered thresholds: A single record with a data size of 1KB and an update cycle of less than 5 seconds can be used as a reference for determining core situational information; the specific threshold is configured by the system according to task requirements.

[0066] Incremental synchronization: When a soldier's situational awareness terminal requests synchronization, the vehicle-mounted micro-server performs the following steps:

[0067] 1. Receive the latest timestamp sent by the individual soldier situation terminal;

[0068] 2. Filter out incremental status records whose timestamps are later than the latest timestamp;

[0069] 3. The synchronization response carries synchronization reference information (reference time / synchronization sequence number) for the terminal to calibrate the local incremental reference;

[0070] 4. Extract core situational information from the incremental situational records and encapsulate it into a priority message;

[0071] 5. Based on the real-time available bandwidth, signal strength, and bit error rate of the current radio network, determine whether auxiliary situation information can be sent simultaneously: if the channel quality is higher than the preset quality threshold, the auxiliary situation information is attached to the sent message; if the channel quality is limited, only the core situation information is sent, and the auxiliary situation information is reserved for subsequent synchronization or requested on demand.

[0072] Through the aforementioned hierarchical caching and incremental synchronization mechanism, under narrowband radio network conditions, it is ensured that the individual soldier situation terminal can prioritize the acquisition of the most critical tactical situation information, while avoiding network congestion.

[0073] Example 3: Synchronization Reference Calibration and Inter-synchronization Fusion in Offline Environments

[0074] Figure 5 This is a schematic diagram illustrating the fusion of synchronous reference calibration and mutual synchronization in an offline environment, as provided in an embodiment of the present invention. Figure 5 As shown:

[0075] Synchronization reference calibration: Under offline conditions, the local clocks of each soldier's situational awareness terminal may drift and become inconsistent. If cross-terminal comparisons are performed directly using the local timestamp, incremental misjudgments will occur. In this embodiment, the vehicle-mounted microserver maintains unified synchronization reference information for the region: each time synchronization is completed with a soldier's situational awareness terminal, the synchronization response carries the current reference time and / or a monotonically increasing synchronization sequence number; the soldier's situational awareness terminal uses the most recently received synchronization reference information as a reference and converts the local situational awareness record's time stamp to the unified reference; when synchronizing with surrounding soldier's situational awareness terminals, the broadcast message carries the most recently obtained synchronization reference information from the source terminal and its relative offset, which the receiving terminal uses for conversion and comparison, thereby ensuring the correctness of the "newest or oldest" judgment across terminals.

[0076] Inter-synchronous integration: The receiving terminal compares the newly broadcast situation information with the local cache. For multiple records of the same target identifier, the one with the latest time is selected according to the converted benchmark information. In scenarios where the time sequence cannot be reliably determined (such as when the benchmark information is missing), the one with the higher node priority or credibility of the broadcast source terminal is retained to prevent expired or low-credibility information from covering high-value situations.

[0077] Example 4: Priority Access Control and Recovery Integrated Reporting

[0078] In scenarios where multiple individual soldier situational awareness terminals simultaneously access the vehicle-mounted microserver, the vehicle-mounted microserver allocates uplink and downlink bandwidth to each individual soldier situational awareness terminal based on one or more of the terminal's role level (e.g., commander terminals are given priority), remaining battery power, and link quality, prioritizing the transmission and reception of core situational information for key roles. When the connection to the terrestrial mobile communication infrastructure is restored, each terminal performs a deduplication comparison between the situational awareness records not uploaded in its local cache and the records from the terrestrial network (e.g., comparison based on target identifiers and a reference time window), reporting only the incremental portion to reduce signaling storms in the initial stage of terrestrial network recovery.

[0079] Example 5: Hierarchical Heterogeneous Situation Distribution System

[0080] Figure 2 This is a schematic diagram of the structure of a hierarchical heterogeneous situation distribution system provided in an embodiment of the present invention. Figure 2 As shown, the system includes:

[0081] The vehicle-mounted microserver 401 is equipped with a low-Earth orbit satellite internet access module, a situational awareness cache module, and a radio distribution module. The vehicle-mounted microserver 401 includes a wide-area access unit 4011, a hierarchical cache unit 4012, an incremental synchronization unit 4013, and a short-range distribution unit 4014. The incremental synchronization unit 4013 is also used to generate and carry synchronization reference information in the synchronization response, and to control the distribution of auxiliary situational awareness information based on channel quality (one or a combination of received signal strength, signal-to-noise ratio, available bandwidth, transmission delay, and packet loss rate).

[0082] The individual soldier situational awareness terminal 402 is equipped with a radio network access module, a low-Earth orbit satellite internet access module, and a network selection module. The individual soldier situational awareness terminal 402 includes a network detection unit 4021, a network selection unit 4022, a situational awareness synchronization unit 4023, and a reference calibration unit 4024. The reference calibration unit 4024 is used to calibrate a local incremental reference based on the synchronization reference information issued by the vehicle-mounted microserver; the situational awareness synchronization unit 4023 is used to synchronize situational information with the vehicle-mounted microserver or other nearby individual soldier situational awareness terminals, and to fuse the information after conflict resolution according to preset fusion rules.

[0083] Radio network 403 is used for short-range communication between the vehicle-mounted micro server 401 and the individual soldier situation terminal 402, as well as between each of the individual soldier situation terminals 402.

[0084] The low-orbit satellite internet 404 is used by the vehicle-mounted micro server 401 to access the wide area network and receive and send wide area situational information.

[0085] The functions and collaborative relationships of each component correspond to those described in the foregoing method embodiments, and will not be repeated here.

[0086] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hierarchical heterogeneous situational awareness distribution method independent of ground infrastructure, applied to a tactical communication system comprising a vehicle-mounted microserver and a soldier's situational awareness terminal, characterized in that, Includes the following steps: S1. Detect whether the current network environment is disconnected from the terrestrial mobile communication infrastructure; S2. When the system detects separation from the ground mobile communication infrastructure, a hierarchical heterogeneous situational awareness distribution mode is activated. The individual soldier situational awareness terminal detects the currently available communication networks and the reachability of the vehicle-mounted micro-server, and adaptively selects the communication mode in the following manner: If the individual soldier situation terminal is in a vehicle-mounted state and the vehicle-mounted micro server is reachable, then the individual soldier situation terminal accesses the low-orbit satellite internet through the vehicle-mounted micro server. If the individual soldier situation terminal is in an unloaded state and the vehicle-mounted micro server is reachable, the individual soldier situation terminal establishes a communication connection with the vehicle-mounted micro server through a radio network, obtains regional situation information from the vehicle-mounted micro server, and transmits the newly obtained local situation information back to the vehicle-mounted micro server through the radio network. If the individual soldier situation terminal is in an off-vehicle state and the vehicle-mounted micro server is unreachable, the individual soldier situation terminal switches to radio network mode to synchronize situation information with other individual soldier situation terminals in the vicinity. S21. The vehicle-mounted micro server accesses the wide area network via low-orbit satellite internet, receives wide area situation information, performs hierarchical processing on the received wide area situation information, divides it into core situation information and auxiliary situation information, caches the core situation information in full, caches the auxiliary situation information selectively, and acts as a regional aggregation node to locally maintain the hierarchically cached situation information. The vehicle-mounted micro server receives the local situational information and caches it locally, then transmits it to the wide area network via the low-orbit satellite internet. S22. The individual soldier situation terminal sends a situation synchronization request to the vehicle-mounted micro server. The situation synchronization request includes the latest timestamp of the situation information cached by the individual soldier situation terminal. The vehicle-mounted micro server carries synchronization reference information in the synchronization response. The individual soldier situation terminal calibrates the local incremental reference according to the synchronization reference information. The vehicle-mounted micro server filters incremental situation information based on the latest timestamp, prioritizes sending the core situation information to the individual soldier situation terminal, and then selectively sends the auxiliary situation information based on the current channel quality of the radio network. S23. The individual soldier situation terminal periodically broadcasts the newly acquired situation information it has acquired to other individual soldier situation terminals in the vicinity, receives the newly acquired situation information broadcast by other individual soldier situation terminals in the vicinity, compares it with the local cache, and merges it after conflict resolution according to the preset fusion rules; when the vehicle-mounted micro server recovers from being unreachable to being reachable, the individual soldier situation terminal performs incremental synchronization in step S22 to the vehicle-mounted micro server. S3. When the connection to the terrestrial mobile communication infrastructure is restored, switch to normal network mode and transmit situational information through the terrestrial mobile communication infrastructure.

2. The method according to claim 1, characterized in that, The core situational information includes target location coordinates, target identifier, and timestamp, and has the characteristics that the data volume is less than the first threshold and the update frequency is higher than the second threshold. The auxiliary situation information includes one or more of the following: detailed target attributes, historical trajectory points, and media data, and has the characteristic that the amount of data is greater than or equal to the first threshold or the update frequency is less than or equal to the second threshold. The selective caching includes: selectively caching the auxiliary situation information based on the remaining cache capacity and the timeliness threshold of the situation information; when the cache capacity is insufficient or the information expires, the auxiliary situation information is preferentially evicted.

3. The method according to claim 1, characterized in that, The channel quality is determined based on one or a combination of the received signal strength, signal-to-noise ratio, available bandwidth, transmission delay, and packet loss rate of the radio network. The step of selectively sending the auxiliary situation information based on the current channel quality of the radio network includes: comparing the channel quality with a preset quality threshold, and when the channel quality is higher than the preset quality threshold, appending the auxiliary situation information to the sent message; When the channel quality is lower than the preset quality threshold, only the core situation information is sent. The core situation information has a sending priority over the auxiliary situation information. The auxiliary situation information is reserved for subsequent synchronization after the channel quality is improved or sent according to the on-demand request of the individual soldier situation terminal.

4. The method according to claim 1, characterized in that, The synchronization reference information includes one or both of the reference time and the synchronization sequence number; The individual soldier situation terminal calibrates the local incremental benchmark based on the synchronization benchmark information, including: the individual soldier situation terminal uses the synchronization benchmark information issued by the vehicle-mounted microserver during the most recent synchronization as a benchmark, compares the version identifier of the locally cached situation information with the benchmark, and generates the latest timestamp carried in subsequent situation synchronization requests; when there is a deviation between the local clock of the individual soldier situation terminal and the vehicle-mounted microserver, the local recorded time identifier is calculated based on the synchronization benchmark information.

5. The method according to claim 1, characterized in that, The preset fusion rules include: When there are multiple situation records for the same target identifier, the record with the latest time is retained according to the synchronization reference information corresponding to each situation record. And / or, based on the node priority or credibility of the individual soldier situational awareness terminal from which the broadcast originates, retain the situational awareness records broadcast by individual soldier situational awareness terminals with higher node priority or credibility.

6. The method according to claim 1, characterized in that, The method also includes priority access control: the vehicle-mounted micro server allocates uplink backhaul bandwidth and downlink bandwidth to each individual soldier situation terminal based on one or more of the role level, remaining power, and link quality of each connected individual soldier situation terminal.

7. The method according to claim 1, characterized in that, When the restoration of the ground mobile communication infrastructure connection is detected, the individual soldier situation terminal and the vehicle-mounted micro server perform deduplication comparison between the situation information that has not yet been uploaded in the local cache and the situation information on the ground network side, and then merge and report it.

8. A hierarchical heterogeneous situational awareness distribution system detached from ground infrastructure, characterized in that, include: The vehicle-mounted micro server is equipped with a low-Earth orbit satellite internet access module, a situational awareness cache module, and a radio distribution module. When disconnected from ground-based mobile communication infrastructure, the vehicle-mounted micro server receives wide-area situational information through the low-Earth orbit satellite internet access module, performs hierarchical processing and local caching of the wide-area situational information through the situational awareness cache module, distributes regional situational information to individual soldier situational terminals through the radio distribution module, and integrates the local situational information received from individual soldier situational terminals into the local cache and transmits it via the low-Earth orbit satellite internet. The individual soldier situational awareness terminal is equipped with a radio network access module, a low-orbit satellite internet access module, and a network selection module. The individual soldier situational awareness terminal is used to detect the availability of current communication networks and the reachability of the vehicle-mounted micro server when disconnected from the ground mobile communication infrastructure. The network selection module adaptively selects between the following modes: when in vehicle mode and the vehicle-mounted micro server is reachable, it accesses the low-orbit satellite internet via the vehicle-mounted micro server; when dismounted and the vehicle-mounted micro server is reachable, it obtains regional situational information from the vehicle-mounted micro server via the radio network access module and transmits back local situational information. When the soldier is off the vehicle and the onboard micro-server is unreachable, the soldier synchronizes the situation with other nearby individual situation terminals via the radio network access module. The vehicle-mounted micro server includes: The wide area access unit is used to access the wide area network through the low-orbit satellite internet access module and receive wide area situation information. The hierarchical caching unit is used to determine the target location coordinates, target identifier and timestamp as core situational information with a data volume less than the first threshold and an update frequency higher than the second threshold and cache them in full; and to determine one or more of the target detailed attributes, historical trajectory points and media data as auxiliary situational information and cache them selectively according to the remaining cache capacity and timeliness threshold. The incremental synchronization unit is used to filter incremental situation information according to the latest timestamp in the situation synchronization request sent by the individual soldier situation terminal, carry synchronization reference information in the synchronization response, and, according to the channel quality control content of the radio network, prioritize the transmission of the core situation information and selectively transmit the auxiliary situation information. The near-field distribution unit is used to send regional situation information to the individual soldier situation terminal through the radio distribution module, and to receive local situation information transmitted back by the individual soldier situation terminal. The individual soldier situational awareness terminal includes: A network detection unit is used to detect the currently available communication networks and the reachability of the vehicle-mounted micro server; The network selection unit is used to select a communication mode based on the detection results: when in a vehicle-mounted state and the vehicle-mounted microserver is reachable, it selects to access the low-orbit satellite internet through the vehicle-mounted microserver; when out of the vehicle and the vehicle-mounted microserver is reachable, it selects to communicate with the vehicle-mounted microserver through the radio network access module; when out of the vehicle and the vehicle-mounted microserver is unreachable, it selects the radio network mode to synchronize with other nearby individual soldier situation terminals, and switches back to the mode of communicating with the vehicle-mounted microserver after the vehicle-mounted microserver becomes reachable again. The situation synchronization unit is used to synchronize situation information with the vehicle-mounted micro server or other nearby individual soldier situation terminals, and to merge newly received situation information after conflict resolution according to preset fusion rules.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the hierarchical heterogeneous situational awareness distribution method detached from ground infrastructure as described in any one of claims 1 to 7.

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