Bus-free multi-node synchronous monitoring method and system

Abstract

The invention relates to the technical field of digital key positioning, and discloses a bus-free multi-node synchronous monitoring method which is based on a vehicle end connecting device composed of a central node and a plurality of slave nodes, and the method specifically comprises the following steps: a digital key carries out Bluetooth broadcasting, and when the central node scans the digital key broadcast, the central node sends the digital key broadcast to the slave nodes; establishing Bluetooth connection with a plurality of slave nodes; the central node transmits the monitoring information to a plurality of slave nodes; the plurality of slave nodes adopt different working modes according to different monitoring information, and send back the monitored message RSSI result of the digital key to the central node; and the central node calculates the distance between the digital key and each slave node according to the message RSSI results returned by the plurality of nodes so as to realize digital key positioning. Scanning target equipment information is transmitted through BLE wireless channel interconnection, the whole connection process is monitored to obtain connection information, the purpose that the slave node monitors the main connection is achieved, electric appliance connection is omitted, the cost can be reduced, and the transmission efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of digital key positioning, and particularly to a method and system for bus-free multi-node synchronous listening. Background Art

[0002] At present, with the booming development of the national economy, the number of automobiles in possession shows an increasing trend year by year. With the continuous improvement of automotive intelligent equipment, automotive digital key systems based on Bluetooth communication are being more and more widely applied. The digital key of a user is essentially an extension and expansion of the functions of a traditional key. In this way, not only can the heavy physical car key be abandoned, but also more modern and practical functions can be realized in addition to the basic functions such as door unlocking and locking, window lifting and lowering, and trunk opening and closing.

[0003] In the current automotive digital key scenario, a common practice is to set a BLE central node at the position of the interior rearview mirror / armrest box, and set multiple Bluetooth slave nodes at positions such as the B-pillar, door handle, front and rear bumpers, and rear roof. The slave nodes are connected to the central node through a CAN / LIN bus. In the prior art, the digital key positioning implementation method is connected to multiple frequency offset modulation modules through a differential bus to transmit the connection information established between the central node and the digital key. The instructions include ID information, connection status information, connection interval information, frequency hopping interval information, the current connection event count value, and the previous unmapped channel. Limited by the bandwidth and transmission efficiency of the connection bus, and some systems do not have the bus driving ability of CAN / LIN for cost reduction reasons, and cannot achieve multi-slave node synchronous listening, which greatly reduces the unlocking and locking experience. Summary of the Invention

[0004] The present invention provides a method and system for bus-free multi-node synchronous listening. By interconnecting through a BLE wireless channel to transmit scanning target device information and listening to the entire connection process to obtain connection information, the purpose of slave node listening to the master connection is achieved, eliminating electrical connections, which can reduce costs and improve transmission efficiency.

[0005] The present invention provides a method for bus-free multi-node synchronous listening, based on a vehicle-side connection device composed of a central node and multiple slave nodes. The method specifically includes:

[0006] S1. The digital key performs Bluetooth broadcasting, and at the same time, the central node performs Bluetooth scanning. When the central node scans the digital key broadcast, a Bluetooth connection is established with multiple slave nodes;

[0007] S2. The central node transmits the listening information to multiple slave nodes; wherein, the listening information includes the broadcast of the digital key or the connection message of the digital key;

[0008] S3. Multiple slave nodes adopt different working methods according to different monitoring information, and transmit the reported RSSI results of the digital key packets obtained by monitoring back to the central node;

[0009] S4. The central node calculates the distance between the digital key and each slave node according to the reported RSSI results of multiple nodes, so as to realize the positioning of the digital key.

[0010] In one embodiment, when the monitoring information is the broadcast of the digital key, step S3 specifically includes:

[0011] S301. The monitoring information sent by the central node includes the IRK, connection ID, and connection status of the digital key;

[0012] S302. Multiple slave nodes start to scan the broadcast of the digital key according to the received monitoring information;

[0013] S303. After multiple slave nodes successfully scan the digital key broadcast, they transmit the connection ID and the reported RSSI results of the digital key packets back to the central node through the Bluetooth connection channel;

[0014] S304. Repeat steps S302 to S303 until the working state ends.

[0015] In one embodiment, in step S301, the IRK of the digital key is used for the slave node to parse the RPA broadcast of the digital key, the connection ID is used for the slave node to identify and distinguish the connection sequence number, and the connection status is used to inform the slave node whether the current connection is active.

[0016] In one embodiment, in step S302, multiple slave nodes use the IRK of the digital key to parse the resolvable broadcast of the digital key, and determine the connection ID and connection status.

[0017] In one embodiment, when the monitoring information is the connection packet of the digital key, step S3 specifically includes:

[0018] S311. The monitoring information sent by the central node includes the connection ID, connection status, hop interval, current connection event count value, previous unmapped channel, crc init value, access address, and hopping channelmap;

[0019] S312. Multiple slave nodes start to monitor the connection packets between the central node and the digital key according to the monitoring information;

[0020] S313. After multiple slave nodes successfully monitor the connection messages of the central node and the digital key, they use the Bluetooth connection channel to send the connection ID and the RSSI result of the digital key's message back to the central node.

[0021] S314. Loop through steps S312 to S313 until the working state ends.

[0022] In one embodiment, in step S311, the connection ID is used for the slave node to identify and distinguish the connection sequence number; the connection status is used to inform the slave node whether the current connection is active; Hop interval represents the hopping interval used by the Bluetooth channel; the current connection event count value represents the count value used for the current Bluetooth connection interval; the previous unmapped channel represents the hopping sequence number used last time; access address represents the access address used for the current connection; the hopping channel map represents the channel bitmap that this connection will use.

[0023] In one embodiment, in step S312, multiple slave nodes monitor the interaction messages between the central node and the digital key on the corresponding channels and timings.

[0024] The present invention also provides a system for bus - less multi - node synchronous monitoring, based on a vehicle - end connection device composed of a central node and multiple slave nodes. The system specifically includes:

[0025] A establishment module, used for the digital key to perform Bluetooth broadcasting, and at the same time the central node performs Bluetooth scanning. After the central node scans the digital key's broadcast, it establishes a Bluetooth connection with multiple slave nodes.

[0026] A transmission module, used for the central node to transmit monitoring information to multiple slave nodes; wherein, the monitoring information includes the broadcast of the digital key or the connection message of the digital key.

[0027] A feedback module, used for multiple slave nodes to adopt different working modes according to different monitoring information and feedback the RSSI result of the monitored digital key's message to the central node.

[0028] A positioning module, used for the central node to calculate the distance between the digital key and each slave node according to the RSSI results of the messages fed back by multiple nodes to achieve digital key positioning.

[0029] The present invention also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the above - mentioned method.

[0030] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. There is no need to electrically connect each slave node, reducing the peripherals, wiring harnesses of the corresponding devices and the implementation of related solutions, and greatly reducing the cost complexity of the entire system.

[0033] 2. The data return efficiency is improved, and the return rate is increased by more than 5 times compared with the LIN bus.

[0034] 3. Multiple listening methods are supported. Especially when adopting the working method of listening to the digital key broadcast, the complexity of the system implementation scheme of the slave node is greatly reduced. When adopting the method of listening to the connection message between the digital key and the central node, compared with other schemes, information such as connection and master-slave relationship can be identified more accurately, reducing the complexity of the entire system of the central node. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the vehicle-end connection device in the present invention.

[0036] Figure 2 It is a schematic flow diagram of the method for multi-node synchronous listening without a bus in the present invention.

[0037] Figure 3 It is a schematic structural diagram of the device in an embodiment of the present invention.

[0038] Figure 4 It is a schematic internal structure diagram of a computer device in an embodiment of the present invention.

[0039] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The present invention can be applied to fields such as digital car key positioning, item searching in warehousing and logistics, digital tags, and smart door locks. In the application of the digital key positioning scenario, by arranging multiple BLE devices around / inside the vehicle, synchronously listening to the communication signal strength of the digital key / physical key, device positioning is achieved. For item searching in the warehousing and logistics field, by arranging multiple BLE devices in the factory area, synchronously listening to the communication signal strength of the tag device, and calculating its location.

[0042] The current vehicle - end topology solution for digital keys mainly consists of 1 central node and N slave nodes. There is an electrical connection between them, such as CAN / LIN bus, etc. Its working process is mainly as follows: ① The mobile phone, as a digital key, establishes a BLE Bluetooth connection with the central node. ② The central node transfers the information of the Bluetooth connection to the slave nodes through the electrical connection. ③ The connection information includes but is not limited to the IRK of the digital key, connection ID, connection status, hop interval, current connection event count value, last unmapped channel, crc init value, access address, and hopping channel map. ④ The main purpose of synchronizing this information is to enable the slave nodes to monitor the connection packets established between the mobile - phone digital key and the central node from the air interface according to the established connection timing sequence, and calculate the RSSI value at the moment when the connection packets arrive. ⑤ When each slave node can obtain the RSSI value of the packets sent by the digital key, it can estimate how much attenuation the digital key signal has undergone and reach the RX end of the slave node at the body position where the slave node is located. Thus, multi - point (central node + slave nodes) positioning of the digital key is achieved, similar to a positioning matrix. Establishing a bus interconnection based on electrical connection increases the complexity and cost of the entire system. Adopting the existing BLE air - interface communication can greatly reduce the material cost, reduce the system complexity, and at the same time ensure the usage experience.

[0043] The present invention transmits the scanned target device information through the BLE wireless channel interconnection, monitors the entire connection process to obtain the connection information, realizes the purpose of the slave node monitoring the main connection, omits the electrical connection, and can reduce the cost and improve the transmission efficiency.

[0044] The present invention provides a method for bus - free multi - node synchronous monitoring, based on a vehicle - end connection device composed of a central node and multiple slave nodes, as Figure 1 shown. There is a BLE connection between multiple slave nodes and the central node, and its working environment can be an automobile or an industrial plant area.

[0045] As Figure 2 shown, the method for bus - free multi - node synchronous monitoring specifically includes:

[0046] S1. The digital key K performs Bluetooth broadcasting, and at the same time, the central node C performs Bluetooth scanning. When the central node C scans the digital key broadcast, it establishes a Bluetooth connection with the slave nodes P1 / P2.

[0047] S2. The central node C transfers the monitoring information to the slave nodes P1 / P2; among them, the monitoring information includes the broadcast of the digital key or the connection packets of the digital key.

[0048] S3. The slave nodes P1 / P2 adopt different working modes according to different listening information, and return the RSSI results of the messages of the digital keys listened to to the central node.

[0049] The two different working modes are for different service scenarios.

[0050] 1> The first working mode:

[0051] When the listening information is the broadcast of the digital key, the step S3 specifically includes:

[0052] S301. The listening information sent by the central node C includes the IRK, connection ID, and connection status of the digital key. The IRK of the digital key is used by the slave node to parse the RPA broadcast of the digital key, the connection ID is used by the slave node to identify and distinguish the connection sequence number, and the connection status is used to inform the slave node whether the current connection is active.

[0053] S302. The slave nodes P1 / P2 start to scan the broadcast of the digital key according to the received listening information; the slave nodes P1 / P2 use the IRK of the digital key to parse the resolvable broadcast of the digital key according to the Bluetooth protocol regulations, and determine the connection ID and connection status. Since the central node can establish connections with multiple mobile phones or digital keys at the same time, it is necessary to distinguish the connections with an ID. The connection status mainly indicates that some mobile phones or digital keys have moved away and the connection is in an inactive state. This field is used to inform the slave node that the connection has failed.

[0054] S303. After the slave nodes P1 / P2 successfully scan the digital key broadcast, they send the scan results, connection ID, and RSSI results of the digital key messages back to the central node through the Bluetooth connection channel.

[0055] The RSSI of the message is uniformly calculated by the receiver at the receiving moment. Generally, communication protocols have this parsing ability. When a frame of message is transmitted from the transmitter to the receiver in the air interface, the receiver can parse the RSSI of this frame of message through the signal strength indication value. The magnitude of the RSSI characterizes how much attenuation the signal has experienced and reaches the receiving end, and can roughly estimate the transmission distance.

[0056] S304. Loop steps S302 to S303 until the working state ends.

[0057] 2> The second working mode:

[0058] When the listening information is the connection message of the digital key, the step S3 specifically includes:

[0059] S311. The monitoring information sent by the central node C includes the connection ID, connection status, hop interval, current connection event count value, the previous unmapped channel, crc init value, access address, and hopping channel map, which are the contents of the Bluetooth protocol connection.

[0060] The connection ID is used for the slave node to identify and distinguish the connection sequence number; the connection status is used to inform the slave node whether the current connection is active; Hop interval represents the hopping interval used by the Bluetooth channel; the current connection event count value represents the count value used for the current Bluetooth connection interval; the previous unmapped channel represents the hopping serial number used last time; access address represents the access address used for the current connection; the hopping channel map represents the channel bitmap that this connection will use.

[0061] S312. The slave nodes P1 / P2 start to monitor the connection messages between the central node C and the digital key K according to the monitoring information; after the central node synchronizes the monitoring information to the slave nodes, the slave nodes can, based on this information, monitor the interaction messages of the main connection (between the central node and the digital key) on the corresponding channels and at the corresponding time sequences. That is, P1\P2 captures the messages from the air interface.

[0062] S313. After the slave nodes P1 / P2 successfully monitor the connection messages between the central node and the digital key, they send the connection ID and the RSSI result of the digital key's message back to the central node through the Bluetooth connection channel.

[0063] After each slave node captures the RSSI of the digital key's message, it will send this information back to the central node through the BLE connection channel. In this way, the central node can uniformly calculate the approximate distance between the digital key and each slave node of the vehicle, and calculate the position of the digital key through some subsequent algorithms (such as least squares, trilateration, etc.).

[0064] S314. Loop through steps S312 to S313 until the working state ends.

[0065] S4. The central node C calculates the distance between the digital key K and each slave node according to the RSSI results of the messages returned by multiple nodes to achieve digital key positioning.

[0066] The present invention does not require electrical connection of each slave node, reducing the peripherals of the corresponding devices, wire harnesses and related solutions. The cost complexity of the entire system is greatly reduced. The data transmission efficiency is improved, and the transmission rate is more than 5 times higher than that of the LIN bus. It supports multiple listening methods. Especially when using the first working mode, the complexity of the system implementation solution of the slave node is greatly reduced. When using the second working mode, compared with other solutions, it can more accurately identify information such as connections and master-slave relationships, reducing the complexity of the entire system of the central node.

[0067] The present invention also provides a system for synchronous listening of multiple nodes without a bus, based on a vehicle-mounted connection device composed of a central node and multiple slave nodes. The system specifically includes:

[0068] Establishment module 1, used for the digital key to perform Bluetooth broadcasting, and at the same time the central node performs Bluetooth scanning. When the central node scans the digital key broadcast, it establishes a Bluetooth connection with multiple slave nodes;

[0069] Transmission module 2, used for the central node to transmit listening information to multiple slave nodes; wherein, the listening information includes the broadcast of the digital key or the connection message of the digital key;

[0070] Return module 3, used for multiple slave nodes to adopt different working modes according to different listening information and return the RSSI results of the messages of the listened digital key to the central node;

[0071] Location module 4, used for the central node to calculate the distance between the digital key and each slave node according to the RSSI results of the messages returned by multiple nodes to achieve digital key positioning.

[0072] In one embodiment, when the listening information is the broadcast of the digital key, the return module 3 includes:

[0073] First sending unit, used for the listening information sent by the central node to include the IRK, connection ID, and connection status of the digital key;

[0074] Scanning unit, used for multiple slave nodes to start scanning the broadcast of the digital key according to the received listening information;

[0075] First return unit, used for multiple slave nodes to return the connection ID and the RSSI results of the messages of the digital key to the central node through the Bluetooth connection channel after successfully scanning the digital key broadcast;

[0076] First loop unit, used to loop steps S302 - S303 until the working state ends.

[0077] In one embodiment, in the first sending unit, the IRK of the digital key is used to resolve the RPA broadcast of the digital key from the node, the connection ID is used to identify and distinguish the connection sequence number from the node, and the connection status is used to inform the slave node whether the current connection is active.

[0078] In one embodiment, in the first scanning unit, multiple slave nodes use the IRK of the digital key to resolve the resolvable broadcast of the digital key and determine the connection ID and connection status.

[0079] In one embodiment, when the listening information is the connection message of the digital key, the feedback module 3 includes:

[0080] A second sending unit, configured to send the listening information sent by the central node, including the connection ID, connection status, hop interval, current connection event count value, previous unmapped channel, crc init value, access address, and hopping channel map;

[0081] A listening unit, configured to enable multiple slave nodes to start listening for the connection messages of the central node and the digital key according to the listening information;

[0082] A second feedback unit, configured to, after multiple slave nodes successfully listen to the connection messages of the central node and the digital key, send back the connection ID and the RSSI result of the digital key message to the central node through the Bluetooth connection channel;

[0083] A second loop unit, configured to loop steps S312 to S313 until the working state ends.

[0084] In one embodiment, in the second sending unit, the connection ID is used to identify and distinguish the connection sequence number from the node; the connection status is used to inform the slave node whether the current connection is active; Hop interval represents the hopping interval used by the Bluetooth channel; the current connection event count value represents the count value used for the current Bluetooth connection interval; the previous unmapped channel represents the hopping serial number used last time; access address represents the access address used for the current connection; the hopping channel map represents the channel bitmap that will be used for this connection.

[0085] In one embodiment, in the listening unit, multiple slave nodes listen for the interaction messages between the central node and the digital key on the corresponding channels and timings.

[0086] The above-mentioned modules and units are respectively used to execute the respective steps in the method for bus-free multi-node synchronous listening. The specific implementation manners refer to the method embodiments described above and will not be elaborated herein.

[0087] AsFigure 4 As shown in the figure, the present invention also provides a computer device, which can be a server, and its internal structure can be as shown in Figure 4 the figure. The computer device includes a processor, a memory, a network interface, and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store all data required for the process of the method for busless multi-node synchronous listening. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements the method for busless multi-node synchronous listening.

[0088] Those skilled in the art can understand that Figure 4 the structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied.

[0089] An embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements any one of the above methods for busless multi-node synchronous listening.

[0090] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium provided in the present application and used in the embodiments can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or an external cache. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0091] It should be noted that, in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, device, article or method. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, device, article or method comprising such element.

[0092] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A method for busless multi-node synchronous monitoring, characterized in that, Based on the vehicle-end connection device composed of a central node and multiple slave nodes, the method specifically includes: S1. The digital key performs Bluetooth broadcasting, and at the same time, the central node performs Bluetooth scanning. After the central node scans the digital key broadcast, a Bluetooth connection is established with multiple slave nodes; S2. The central node transmits the monitoring information to multiple slave nodes; wherein, the monitoring information includes the broadcast of the digital key or the connection message of the digital key; S3. Multiple slave nodes adopt different working modes according to different monitoring information, and return the RSSI results of the monitored digital key messages to the central node; S4. The central node calculates the distance between the digital key and each slave node according to the RSSI results of the messages returned by multiple nodes to achieve digital key positioning.

2. The method for bus-free multi-node synchronous monitoring according to claim 1, characterized in that When the monitoring information is the broadcast of the digital key, the step S3 specifically includes: S301. The monitoring information sent by the central node includes the IRK of the digital key, the connection ID, and the connection status; S302. Multiple slave nodes start scanning the broadcast of the digital key according to the received monitoring information; S303. After multiple slave nodes successfully scan the digital key broadcast, the connection ID and the RSSI result of the digital key message are returned to the central node through the Bluetooth connection channel; S304. Loop steps S302 to S303 until the working state ends.

3. The method for bus-free multi-node synchronous listening according to claim 2, wherein In the step S301, the IRK of the digital key is used by the slave node to parse the RPA broadcast of the digital key, the connection ID is used by the slave node to identify and distinguish the connection serial number, and the connection status is used to inform the slave node whether the current connection is active.

4. The method for bus-free multi-node synchronous listening according to claim 2, characterized in that, In the step S302, multiple slave nodes use the IRK of the digital key to parse the resolvable broadcast of the digital key and determine the connection ID and the connection status.

5. The method for bus-free multi-node synchronous monitoring according to claim 1, characterized in that, When the monitoring information is the connection message of the digital key, the step S3 specifically includes: S311. The monitoring information sent by the central node includes the connection ID, the connection status, the hop interval, the current connection event count value, the previous unmapped channel, the crc init value, the access address, and the hopping channel map; S312. Multiple slave nodes start monitoring the connection message between the central node and the digital key according to the monitoring information; S313. After multiple slave nodes successfully monitor the connection message between the central node and the digital key, the connection ID and the RSSI result of the digital key message are returned to the central node through the Bluetooth connection channel; S314. Loop steps S312 to S313 until the working state ends.

6. The method for bus-free multi-node synchronous monitoring according to claim 5, characterized in that In the step S311, the connection ID is used to identify and distinguish the connection sequence number from the node; the connection status is used to inform the slave node whether the current connection is active; Hop interval represents the hopping interval used by the Bluetooth channel; the current connection event count value represents the count value used for the current Bluetooth connection interval; the previous unmapped channel represents the hopping sequence number used last time; access address represents the access address used for the current connection; the hopping channel map represents the channel bitmap that this connection will use.

7. The method for bus - less multi - node synchronous listening according to claim 5, wherein In the step S312, multiple slave nodes listen to the interaction messages between the central node and the digital key on the corresponding channels and time sequences.

8. A system for bus-free multi-node synchronous monitoring, characterized in that, Based on a vehicle-side connection device composed of a central node and multiple slave nodes, the system specifically includes: A establishment module, which is used to perform Bluetooth broadcast for the digital key, and at the same time the central node performs Bluetooth scanning, and when the central node scans the digital key broadcast, establish Bluetooth connections with multiple slave nodes; A transmission module, which is used for the central node to transmit the listening information to multiple slave nodes; wherein, the listening information includes the broadcast of the digital key or the connection message of the digital key; A feedback module, which is used for multiple slave nodes to adopt different working modes according to different listening information and feedback the RSSI results of the listened digital key messages to the central node; A positioning module, which is used for the central node to calculate the distance between the digital key and each slave node according to the RSSI results of the messages fed back by multiple nodes to realize digital key positioning.

9. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it realizes the steps of the method described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it realizes the steps of the method described in any one of claims 1 to 7.

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