A regional through detection method and system based on wide area network

Abstract

The present application discloses a method and system for detecting a region through a wide area network, wherein the region through detection system based on a wide area network includes at least: a gateway subsystem, at least one electronic tag, and a host device; wherein the gateway subsystem: sends a broadcast signal through two radio frequency transmission links; receives a feedback signal, and forwards the feedback signal to the host device; the electronic tag: receives the broadcast signal when the threshold trigger condition is reached, and sends a feedback signal according to the broadcast signal; the host device: performs logical judgment according to the punch-in information of the feedback signal, and obtains a judgment result, wherein the judgment result is: the region is passed or filtered. The present application improves the accuracy and reliability of detection.

Description

Technical Field

[0001] The present application relates to the technical field of Internet of Things, and in particular to a wide area network-based area passage detection method and system thereof. Background Art

[0002] With the development of the information age, the digitalization of all connected assets is an inevitable trend. All items and assets can be connected to the Internet through electronic tags. Low-power wide area network (LPWAN) technology is widely used in the field of the Internet of Things due to its low power consumption, large capacity, high sensitivity and wide coverage. However, the long transmission distance and wide coverage of low-power wide area networks have become problems in some scenarios. For example, in the regional management of assets and regional entry / passing scenarios, low-power wide area networks cannot achieve accurate detection.

[0003] At present, in scenarios such as regional management of assets and regional entry / passage, the commonly used technical solutions on the market are Radio Frequency Identification (RFID) or visual recognition. However, the RFID link budget is limited, and it has the disadvantage of a high "missed read" rate when there is obstruction or stacking of goods. Visual recognition equipment is expensive, and the objects to be detected need to be directly photographed and identified. In the case of stacking or boxing obstruction, accurate detection cannot be achieved.

[0004] The commonly used technical solutions have certain limitations due to their own technical characteristics, such as insufficient recognition accuracy when there is stacking or occlusion. Therefore, there is an urgent need for a system that can accurately detect the passage of an area in real time. Summary of the invention

[0005] The purpose of this application is to provide a wide area network-based area passage detection method and system, which can accurately detect area passage in real time and improve the accuracy and reliability of detection.

[0006] To achieve the above-mentioned purpose, the present application provides a wide area network-based area through detection system, which at least includes: a gateway subsystem, at least one electronic tag and a host device; wherein the gateway subsystem: sends a broadcast signal through two radio frequency transmission links, wherein the types of broadcast signals include: broadcast signal A and broadcast signal B; receives a feedback signal and forwards the feedback signal to the host device; the electronic tag: when the threshold trigger condition is reached, receives the broadcast signal and sends a feedback signal according to the broadcast signal, wherein the types of feedback information include: feedback signal A and feedback signal B; the host device: performs logical processing according to the punch-in information of the feedback signal Judge and obtain a judgment result, wherein the judgment result is: area passed or filtered processing; when the punch-in information of the feedback signal includes the punch-in channel and the punch-in order, door pairing is performed according to the punch-in channel and the punch-in order to obtain the current door, and the current door is judged in pairs using the preset door pairing information. If the door pairing information contains the current door, the pairing is correct and the judgment result obtained is area passed; if the door pairing information does not contain the current door, the pairing is incorrect, and the judgment result obtained is filtered processing; when the punch-in information of the feedback signal only includes the punch-in channel, door pairing cannot be performed, and the judgment result obtained is filtered processing.

[0007] As above, the gateway subsystem at least includes: a gateway, an antenna A, an antenna B and an antenna C; antenna A and antenna B are both installed at the location to be detected, and the back direction of antenna A is close to the back direction of antenna B, and the front direction of antenna A is set as area A, and the front direction of antenna B is set as area B; the gateway and antenna A constitute one RF transmission link, the gateway and antenna B constitute another RF transmission link, and the gateway and antenna C constitute an RF receiving link; the gateway: is used to send a broadcast signal A through one RF transmission link, send a broadcast signal B through another RF transmission link, and receive a feedback signal through the RF receiving link.

[0008] As above, the height of antenna A is greater than or equal to the first height threshold and less than or equal to the second height threshold; the height of antenna B is greater than or equal to the third height threshold and less than or equal to the fourth height threshold.

[0009] As above, the angle between antenna A and the horizontal plane is the first predetermined angle; the angle between antenna B and the horizontal plane is the second predetermined angle.

[0010] As above, the front-to-back ratios of antenna power flux density of antenna A and antenna B are both greater than or equal to the first front-to-back ratio threshold of antenna power flux density, and less than or equal to the second front-to-back ratio threshold of antenna power flux density.

[0011] As mentioned above, the electronic tag is embedded with an acceleration sensor, and an acceleration trigger threshold is pre-set in the acceleration sensor. The threshold trigger condition preset by the electronic tag is to simultaneously meet the initial wireless energy trigger threshold and the acceleration trigger threshold. When the electronic tag is in a stationary state, the electronic tag does not meet the threshold trigger condition, and the electronic tag is in a dormant state; when the electronic tag enters the area to be detected to perform regional communication actions and meets the threshold trigger condition, the electronic tag is triggered successfully.

[0012] The present application also provides a regional through detection method based on a wide area network, comprising the following steps: a gateway subsystem sends a broadcast signal through two radio frequency transmission links, wherein the types of broadcast signals include: broadcast signal A and broadcast signal B; when the electronic tag reaches a threshold trigger condition, the electronic tag receives the broadcast signal and sends a feedback signal according to the broadcast signal, wherein the types of feedback information include: feedback signal A and feedback signal B; the gateway subsystem receives the feedback signal and forwards the feedback signal to a host device; the host device performs a logical judgment based on the punch-in information of the feedback signal to obtain a judgment result, wherein In the above example, the judgment result is: area passed or filtered processing; when the punch-in information of the feedback signal includes the punch-in channel and the punch-in order, the door pairing is performed according to the punch-in channel and the punch-in order to obtain the current door, and the current door is judged in pairs using the preset door pairing information. If the door pairing information contains the current door, the pairing is correct and the judgment result is area passed. If the door pairing information does not contain the current door, the pairing is incorrect and the judgment result is filtered processing. When the punch-in information of the feedback signal only includes the punch-in channel, door pairing cannot be performed and the judgment result is filtered processing.

[0013] As mentioned above, after the gateway of the gateway subsystem receives the feedback signal, it also needs to send an ACK confirmation frame to the electronic tag. After sending the ACK confirmation frame, the gateway subsystem forwards the feedback signal to the host computer device.

[0014] As above, when the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal, and the sub-steps of sending a feedback signal according to the broadcast signal are as follows: S21: When the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal, and after receiving the broadcast signal, calculates the backoff duration according to the parameter information carried by the broadcast signal; S22: The electronic tag sends a feedback signal to the broadcast signal according to the backoff duration; S23: After the feedback signal is sent, if the electronic tag receives an ACK confirmation frame sent by the gateway of the gateway subsystem, S25 is executed; if the electronic tag does not receive the ACK confirmation frame sent by the gateway of the gateway subsystem, S24 is executed; S24: The electronic tag obtains a new backoff duration and executes S22; S25: The electronic tag enters a sleep state and no longer sends a feedback signal in this round.

[0015] As mentioned above, the electronic tag feedback signal is not sent immediately, and the backoff duration needs to be calculated according to the backoff algorithm, wherein the backoff duration is linearly related to the system time slot length.

[0016] The present application can accurately detect area passage in real time, improve the accuracy and reliability of area passage detection, and can ensure accurate detection even in the presence of stacking or boxing obstructions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of a wide area network-based area passage detection system;

[0019] Figure 2 A schematic diagram of the structure of an embodiment of the arrangement of antenna A and antenna B;

[0020] Figure 3 The present invention is a flow chart of an embodiment of a wide area network-based area detection method. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] like Figure 1-2 As shown, the present application provides a wide area network-based area passage detection system, which at least includes: a gateway subsystem 1, at least one electronic tag 2 and a host computer device 3.

[0023] Among them, the gateway subsystem 1: sends out broadcast signals through two RF transmission links, wherein the types of broadcast signals include: broadcast signal A and broadcast signal B; receives feedback signals, and forwards the feedback signals to the upper computer device.

[0024] Electronic tag 2: When the threshold trigger condition is reached, it receives the broadcast signal and sends a feedback signal according to the broadcast signal, wherein the types of feedback information include: feedback signal A and feedback signal B.

[0025] Host device 3: Perform logical judgment according to the punch-in information of the feedback signal to obtain a judgment result, wherein the judgment result is: area passed or filtered. When the punch-in information of the feedback signal includes the punch-in channel and the punch-in order, the door pairing is performed according to the punch-in channel and the punch-in order to obtain the current door, and the current door is paired using the pre-set door pairing information. If the door pairing information contains the current door, the pairing is correct and the judgment result obtained is area passed. If the door pairing information does not contain the current door, the pairing is incorrect, and the judgment result obtained is filtered. When the punch-in information of the feedback signal only includes the punch-in channel, the door pairing cannot be performed, and the judgment result obtained is filtered.

[0026] Furthermore, the gateway subsystem 1 has at least two RF transmission links and one RF receiving link; wherein: one RF transmission link is used to send a broadcast signal A; the other RF transmission link is used to send a broadcast signal B; and one RF receiving link is used to receive a feedback signal.

[0027] Further, such as Figure 2 As shown, the gateway subsystem 1 at least includes: a gateway, an antenna A, an antenna B and an antenna C; antenna A and antenna B are both installed at the location to be detected, and the back direction of antenna A is close to the back direction of antenna B, and the front direction of antenna A is set as area A, and the front direction of antenna B is set as area B; the gateway and antenna A form one RF transmission link, the gateway and antenna B form another RF transmission link, and the gateway and antenna C form a RF receiving link; the gateway: is used to send a broadcast signal A through one RF transmission link, send a broadcast signal B through another RF transmission link, and receive a feedback signal through the RF receiving link.

[0028] Specifically, according to the dual-antenna back-to-back mechanism, antenna A and antenna B are used to divide the area to be detected into two partitions in different directions, area A and area B, thereby realizing two-way partition triggering of the electronic tag, effectively filtering out misreadings, and further realizing the direction identification of area passing.

[0029] When the electronic tag is in area A, the broadcast signal A emitted by one RF transmission link (i.e., channel A) is regarded as a useful signal, and the broadcast signal B emitted by another RF transmission link (i.e., channel B) is regarded as an interference signal. At this time, the signal strength A of the broadcast signal A is much greater than the signal strength B of the broadcast signal B. The electronic tag clocks in at channel A, i.e., sends feedback signal A; similarly, when the electronic tag moves to area B, it clocks in at channel B, i.e., sends feedback signal B.

[0030] Furthermore, the antenna C is an omnidirectional antenna, but is not limited to an omnidirectional antenna. The present application preferably uses an omnidirectional antenna.

[0031] Furthermore, the height of antenna A is greater than or equal to a first height threshold and less than or equal to a second height threshold.

[0032] Furthermore, the first height threshold is equal to 2.5m, but not limited to 2.5m; the second height threshold is equal to 3m, but not limited to 3m.

[0033] Specifically, the height of antenna A is [2.5m, 3m], but is not limited to [2.5m, 3m]. The preferred height in this application is [2.5m, 3m].

[0034] Furthermore, the angle between the antenna A and the horizontal plane is a first predetermined angle.

[0035] Furthermore, the first predetermined angle is equal to 45°, but is not limited to 45°.

[0036] Specifically, the angle between the antenna A and the horizontal plane (ie, the first predetermined angle) is 45°, but is not limited to 45°. The preferred angle in the present application is 45°.

[0037] Furthermore, the height of antenna B is greater than or equal to a third height threshold and less than or equal to a fourth height threshold.

[0038] Furthermore, the third height threshold is equal to 2.5m, but not limited to 2.5m; the fourth height threshold is equal to 3m, but not limited to 3m.

[0039] Specifically, the height of antenna B is [2.5m, 3m], but is not limited to [2.5m, 3m]. The preferred height in this application is [2.5m, 3m].

[0040] Furthermore, the angle between the antenna B and the horizontal plane is a second predetermined angle.

[0041] Furthermore, the second predetermined angle is equal to 45°, but is not limited to 45°.

[0042] Specifically, the angle between the antenna B and the horizontal plane (ie, the second predetermined angle) is 45°, but is not limited to 45°. The preferred angle in the present application is 45°.

[0043] Furthermore, the front-to-back ratios of antenna power flux density of antenna A and antenna B are both greater than or equal to a first front-to-back ratio threshold of antenna power flux density, and less than or equal to a second front-to-back ratio threshold of antenna power flux density.

[0044] Furthermore, the front-to-back ratio threshold of the first antenna power flux density is equal to 30 dB, but is not limited to 30 dB; the front-to-back ratio threshold of the second antenna power flux density is equal to 40 dB, but is not limited to 40 dB.

[0045] Specifically, the RF of the two RF transmission links needs to be controlled by the antenna waveform, and the front-to-back ratio of the antenna power flux density of antenna A and antenna B is [30dB, 40dB], but not limited to [30dB, 40dB]. The preferred ratio in this application is [30dB, 40dB], which concentrates the effective signal in the front direction of the antenna (ie, the forward direction) and controls the signal strength in the back direction of the antenna (ie, the back direction).

[0046] Specifically, through antenna waveform control, the signal strength of the wireless signals sent by the two RF transmission links is strong in the front direction of the antenna, and the signal strength is weak in the back direction of the antenna.

[0047] Furthermore, the electronic tag is embedded with an acceleration sensor, and an acceleration trigger threshold is pre-set in the acceleration sensor.

[0048] Specifically, providing an acceleration sensor in the electronic tag 2 can reduce "false triggering" and further reduce the power consumption of the electronic tag.

[0049] Furthermore, when the electronic tag is in a stationary state, the electronic tag does not meet the threshold trigger condition and is in a dormant state; when the electronic tag enters the location to be detected to perform regional communication and meets the threshold trigger condition, the electronic tag is triggered successfully.

[0050] Specifically, when the electronic tag is in a static state, the electronic tag does not meet the threshold trigger condition, the electronic tag cannot be awakened, cannot listen to the broadcast signal, and cannot perform subsequent logical judgments based on the broadcast signal. The electronic tag is in a low-power standby / sleep state, thereby achieving the purpose of saving its own power consumption. When the electronic tag enters the area to be detected to perform regional communication actions and meets the threshold trigger condition, the electronic tag is awakened and starts to listen to the broadcast signal, so that it can perform subsequent logical judgments based on the broadcast signal.

[0051] Furthermore, the threshold trigger condition preset by the electronic tag 2 is to simultaneously meet the initial wireless energy trigger threshold and the acceleration trigger threshold.

[0052] Specifically, the electronic tag 2 is pre-set with an initial wireless energy trigger threshold and an acceleration trigger threshold. Only when both the initial wireless energy trigger threshold and the acceleration trigger threshold are satisfied, the electronic tag will be successfully triggered and initiate a feedback signal.

[0053] like Figure 3 As shown, the present application provides a wide area network-based area pass detection method, comprising the following steps:

[0054] S1: The gateway subsystem sends a broadcast signal through two radio frequency transmission links, wherein the types of the broadcast signal include: broadcast signal A and broadcast signal B.

[0055] Furthermore, the two RF transmission links are respectively used to send out different types of broadcast signals. The gateway subsystem sends out a broadcast signal A through one RF transmission link and sends out a broadcast signal B through another RF transmission link.

[0056] Furthermore, the parameter information carried in the broadcast signal includes at least: current time slot number s, time slot length a, number of time slots n and random backoff number m.

[0057] S2: When the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal and sends a feedback signal according to the broadcast signal, wherein the types of feedback information include: feedback signal A and feedback signal B.

[0058] Furthermore, the electronic tag sends a feedback signal of a corresponding type according to the type of the broadcast signal. When the broadcast signal received by the electronic tag is broadcast signal A, the feedback signal sent by the electronic tag is feedback signal A; when the broadcast signal received by the electronic tag is broadcast signal B, the feedback signal sent by the electronic tag is feedback signal B.

[0059] Furthermore, when the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal and sends a feedback signal according to the broadcast signal. The sub-steps are as follows:

[0060] S21: When the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal, and after receiving the broadcast signal, calculates the backoff duration according to the parameter information carried in the broadcast signal.

[0061] Specifically, in order to improve the channel utilization rate of the area passage detection system based on the wide area network and meet the high concurrency requirements of multiple electronic tags being triggered simultaneously, the conflict avoidance logic of the electronic tags during concurrency is designed, that is, the backoff duration is calculated according to the parameter information carried by the broadcast signal.

[0062] S22: The electronic tag sends a feedback signal to the broadcast signal according to the backoff duration.

[0063] Furthermore, the electronic tag feedback signal is not sent immediately, and a backoff duration needs to be calculated according to a backoff algorithm, wherein the backoff duration is linearly related to the system time slot length.

[0064] Further, as an embodiment, the electronic tag calculates the backoff duration according to the parameter information carried by the broadcast signal through a backoff algorithm.

[0065] Furthermore, the backoff algorithm used by the electronic tag to calculate the backoff duration based on the parameter information carried by the broadcast signal is one or more of a variety of algorithms that can achieve the effect of time slot alignment in a very lightweight manner, such as: random backoff and ID time slot remainder backoff, but not limited to random backoff and ID time slot remainder backoff. The present application prefers random backoff.

[0066] Furthermore, when the backoff algorithm is random backoff, the backoff duration is expressed as follows:

[0067] T=rand(m)*a*n+a*(n-MOD(s / n));

[0068] Among them, T is the backoff duration; m is the random backoff number; a is the time slot length; n is the number of time slots; s is the current time slot number; rand() is the random function; MOD() is the remainder function.

[0069] As an example, assume that the value of m is 10, and the random function rand() randomly selects a number from 1 to 10. Assume that the value of n is 8, and the value of s is 10, that is, MOD(10 / 8), then the remainder of the remainder function MOD() is 2.

[0070] Specifically, the electronic tag sends a feedback signal to the broadcast signal according to the backoff duration, which can ensure that the starting time of the feedback signal sent by each electronic tag is located at the frame header, that is, the starting position of the time slot, that is, batch time slot alignment can be achieved without the need for node devices to register to the network.

[0071] The wireless protocol frame types in the wide area network-based area detection system include: gateway broadcast frame (i.e., broadcast signal), tag trigger feedback frame (i.e., feedback signal) and ACK (Acknowledge character, confirmation character) frame (i.e., ACK confirmation frame). Assume that the gateway broadcast frame takes x milliseconds, the tag trigger feedback frame takes y milliseconds, and the ACK frame takes z milliseconds.

[0072] The concept of time slot is introduced in the area detection system based on wide area network. The length of a frame time slot is b milliseconds. A frame time slot contains n time slots, and each time slot is a milliseconds long, that is: b=a*n.

[0073] The duration of each time slot must satisfy a=x+gap1, where x is the duration of the gateway broadcast frame, and gap1 is the first interval duration, that is, the length of a time slot is greater than the length of a gateway broadcast frame.

[0074] The length of each frame time slot b must satisfy b≥y+z+2*gap2, where y is the time it takes for the tag to trigger a feedback frame, z is the time it takes for the ACK frame to be received, and gap2 is the second interval length. That is, the process from each electronic tag being triggered to receiving the ACK confirmation frame must be completed within the length of one frame time slot.

[0075] S23: After the feedback signal is sent, if the electronic tag receives an ACK confirmation frame sent by the gateway of the gateway subsystem, S25 is executed; if the electronic tag does not receive the ACK confirmation frame sent by the gateway of the gateway subsystem, S24 is executed.

[0076] S24: The electronic tag obtains a new backoff duration and executes S22.

[0077] Specifically, if the electronic tag does not receive an ACK confirmation frame after sending a feedback signal, it may be that two or more electronic tags are randomly assigned to the same time slot, resulting in a transmission conflict. Therefore, it is necessary to obtain a new backoff duration through the backoff formula again, and send it again in a dispersed manner according to the new backoff duration until all electronic tags successfully receive the ACK confirmation frame.

[0078] Furthermore, the new backoff duration expression is as follows:

[0079] T' = rand(m)*a*n;

[0080] Wherein, T' is the new backoff duration; m is the random backoff number; a is the time slot length; n is the number of time slots; and rand() is a random function.

[0081] S25: The electronic tag enters the dormant state and no longer sends feedback signals in this round.

[0082] Specifically, after the electronic tag sends a feedback signal, if there is no concurrent conflict with other electronic tags, the electronic tag will receive an ACK confirmation frame replied by the gateway, and then enter sleep mode, and no longer send feedback signals in this round.

[0083] S3: The gateway subsystem receives the feedback signal and forwards the feedback signal to the host device.

[0084] Furthermore, after receiving the feedback signal, the gateway of the gateway subsystem needs to send an ACK confirmation frame to the electronic tag. After sending the ACK confirmation frame, the gateway subsystem forwards the feedback signal to the host computer device.

[0085] S4: The upper computer device performs logical judgment according to the punch-in information of the feedback signal to obtain a judgment result, wherein the judgment result is: area passed or filtered processing; when the punch-in information of the feedback signal includes the punch-in channel and the punch-in order, door pairing is performed according to the punch-in channel and the punch-in order to obtain the current door, and the current door is paired using the preset door pairing information. If the door pairing information contains the current door, the pairing is correct and the judgment result obtained is area passed; if the door pairing information does not contain the current door, the pairing is incorrect, and the judgment result obtained is filtered processing; when the punch-in information of the feedback signal only includes the punch-in channel, door pairing cannot be performed, and the judgment result obtained is filtered processing.

[0086] Among them, area passing refers to the moving direction of the electronic tag identified by logical judgment.

[0087] Specifically, the preset door pairing information includes multiple doors, and one door includes: at least two punch-in channels and the punch-in order. For example: door 1 is AB, that is: door 1 includes: channel A and channel B, and the punch-in order is from area A to area B; door 2 is CD, that is: door 2 includes: channel C and channel D, and the punch-in order is from area C to area D; door 3 is EF, that is: door 3 includes: channel E and channel F, and the punch-in order is from area E to area F. Among them, the contents included in the door and the specific number of doors are determined according to actual conditions.

[0088] Assume that the preset door pairing information includes: door 1, door 2, and door 3.

[0089] like Figure 2 As shown in the figure, if the electronic tag moves in both area A and area B, and the order of movement is from area A to area B, the electronic tag punches in at the corresponding channel according to the order of movement, that is, area A triggers the electronic tag to punch in first, and area B triggers the electronic tag to punch in later. The host device will receive the punch-in report records from A->B in sequence. The host device performs door pairing according to the punch-in channel and the punch-in order of the electronic tag, and obtains the current door AB. Since the pre-set door pairing information contains the current door AB, the pairing is correct, and the judgment result obtained is area passing, that is, the electronic tag passes from area A to area B.

[0090] If the electronic tag moves in both area A and area C, and the order of movement is from area A to area C, the electronic tag punches in at the corresponding channel according to the order of movement, that is, the electronic tag punches in at channel A first, and then punches in at channel C. The host computer device performs door pairing based on the channels and the order of punching in of the electronic tag to obtain the current door AC. Since the current door AC is not included in the pre-set door pairing information, the pairing is incorrect, and the judgment result obtained is filtering processing.

[0091] If the electronic tag moves only in either area A or area B, the electronic tag only checks in at the channel corresponding to the moving area (i.e., the electronic tag only checks in at the single-sided channel area). The host device performs logical judgment based on the channel where the electronic tag checks in, and the judgment result obtained is filtering processing.

[0092] The present application can accurately detect area passage in real time, improve the accuracy and reliability of area passage detection, and can ensure accurate detection even in the presence of stacking or boxing obstructions.

[0093] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the scope of protection of the present application is intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application. Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the protection scope of the present application and its equivalent technology, the present application is also intended to include these modifications and variations.

Claims

1. A wide area network-based area passage detection system, characterized in that: At least: Gateway subsystem, at least one electronic tag and host computer equipment; The gateway subsystem: sends broadcast signals through two radio frequency transmission links, wherein the types of broadcast signals include: broadcast signal A and broadcast signal B; receives feedback signals, and forwards the feedback signals to the host device; Electronic tag: When the threshold trigger condition is reached, it receives the broadcast signal and sends a feedback signal according to the broadcast signal, wherein the types of feedback information include: feedback signal A and feedback signal B; Host device: Perform logical judgment based on the punch-in information of the feedback signal to obtain the judgment result, where the judgment result is: the area passes or is filtered; The gateway subsystem at least includes: antenna A and antenna B; antenna A and antenna B are both installed at the location to be detected, and the back direction of antenna A is close to the back direction of antenna B, and the front direction of antenna A is set as area A, and the front direction of antenna B is set as area B; When the punch-in information of the feedback signal includes the punch-in channel and the punch-in order, the punch-in order is to move from area A to area B; the door pairing is performed according to the punch-in channel and the punch-in order to obtain the current door, and the current door is judged in pairs using the preset door pairing information. If the door pairing information contains the current door, the pairing is correct, and the judgment result obtained is that the area is passed; if the door pairing information does not contain the current door, the pairing is incorrect, and the judgment result obtained is filtering processing; when the punch-in information of the feedback signal only includes the punch-in channel, the door pairing cannot be performed, and the judgment result obtained is filtering processing; Among them, when the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal and sends a feedback signal according to the broadcast signal. The sub-steps are as follows: S21: When the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal, and after receiving the broadcast signal, calculates the backoff duration according to the parameter information carried by the broadcast signal through the backoff algorithm; S22: The electronic tag sends a feedback signal to the broadcast signal according to the backoff time; S23: After the feedback signal is sent, if the electronic tag receives an ACK confirmation frame sent by the gateway of the gateway subsystem, S25 is executed; if the electronic tag does not receive the ACK confirmation frame sent by the gateway of the gateway subsystem, S24 is executed; S24: The electronic tag obtains a new backoff duration and executes S22; S25: The electronic tag enters the dormant state and no longer sends feedback signals in this round; When the backoff algorithm is random backoff, the backoff duration is expressed as follows: ； Where T is the backoff duration; m is the random backoff number; a is the time slot length; n is the number of time slots; s is the current time slot number; is a random function; is the remainder function; The new backoff duration is expressed as follows: ； in, is the new backoff duration; Among them, the threshold trigger condition preset by the electronic tag is to simultaneously meet the initial wireless energy trigger threshold and the acceleration trigger threshold. When the electronic tag is in a stationary state, the electronic tag does not meet the threshold trigger condition and the electronic tag is in a dormant state; when the electronic tag enters the area to be detected to perform regional communication and meets the threshold trigger condition, the electronic tag is triggered successfully.

2. The wide area network-based area passage detection system according to claim 1, characterized in that: The gateway subsystem also includes: a gateway and an antenna C; The gateway and antenna A form one RF transmission link, the gateway and antenna B form another RF transmission link, and the gateway and antenna C form a RF receiving link; Gateway: used to send a broadcast signal A through one RF transmission link, send a broadcast signal B through another RF transmission link, and receive a feedback signal through a RF receiving link.

3. The wide area network-based area passage detection system according to claim 1, characterized in that: The height of antenna A is greater than or equal to the first height threshold and less than or equal to the second height threshold; the height of antenna B is greater than or equal to the third height threshold and less than or equal to the fourth height threshold.

4. The wide area network-based area passage detection system according to claim 3, characterized in that: The angle between antenna A and the horizontal plane is a first predetermined angle; the angle between antenna B and the horizontal plane is a second predetermined angle.

5. The wide area network-based area passage detection system according to claim 4, characterized in that: The front-to-back ratios of antenna power flux density of antenna A and antenna B are both greater than or equal to the first front-to-back ratio threshold of antenna power flux density, and less than or equal to the second front-to-back ratio threshold of antenna power flux density.

6. The wide area network-based area passage detection system according to claim 2, characterized in that: The electronic tag is embedded with an acceleration sensor, and an acceleration trigger threshold is pre-set in the acceleration sensor.

7. A method for detecting area passing through a wide area network, characterized in that: The steps include: The gateway subsystem sends a broadcast signal through two radio frequency transmission links, wherein the types of the broadcast signal include: broadcast signal A and broadcast signal B; wherein the gateway subsystem at least includes: antenna A and antenna B; antenna A and antenna B are both installed at the location to be detected, and the back direction of antenna A is close to the back direction of antenna B, and the front direction of antenna A is set as area A, and the front direction of antenna B is set as area B; When the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal and sends a feedback signal according to the broadcast signal, wherein the types of feedback information include: feedback signal A and feedback signal B; The gateway subsystem receives the feedback signal and forwards it to the host device; The host device performs logical judgment according to the punch-in information of the feedback signal to obtain a judgment result, wherein the judgment result is: area passed or filtered processing; when the punch-in information of the feedback signal includes the punch-in channel and the punch-in order, the punch-in order is to move from area A to area B; door pairing is performed according to the punch-in channel and the punch-in order to obtain the current door, and the current door is paired using the preset door pairing information. If the door pairing information contains the current door, the pairing is correct and the judgment result obtained is area passed; if the door pairing information does not contain the current door, the pairing is incorrect, and the judgment result obtained is filtered processing; when the punch-in information of the feedback signal only includes the punch-in channel, door pairing cannot be performed, and the judgment result obtained is filtered processing; Among them, when the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal and sends a feedback signal according to the broadcast signal. The sub-steps are as follows: S21: When the electronic tag reaches the threshold trigger condition, the electronic tag receives the broadcast signal, and after receiving the broadcast signal, calculates the backoff duration according to the parameter information carried by the broadcast signal through the backoff algorithm; S22: The electronic tag sends a feedback signal to the broadcast signal according to the backoff time; S23: After the feedback signal is sent, if the electronic tag receives an ACK confirmation frame sent by the gateway of the gateway subsystem, S25 is executed; if the electronic tag does not receive the ACK confirmation frame sent by the gateway of the gateway subsystem, S24 is executed; S24: The electronic tag obtains a new backoff duration and executes S22; S25: The electronic tag enters the dormant state and no longer sends feedback signals in this round; When the backoff algorithm is random backoff, the backoff duration is expressed as follows: ； Where T is the backoff duration; m is the random backoff number; a is the time slot length; n is the number of time slots; s is the current time slot number; is a random function; is the remainder function; The new backoff duration is expressed as follows: ； in, is the new backoff duration; Among them, the threshold trigger condition preset by the electronic tag is to simultaneously meet the initial wireless energy trigger threshold and the acceleration trigger threshold. When the electronic tag is in a stationary state, the electronic tag does not meet the threshold trigger condition and the electronic tag is in a dormant state; when the electronic tag enters the area to be detected to perform regional communication and meets the threshold trigger condition, the electronic tag is triggered successfully.

8. The area passing detection method based on wide area network according to claim 7 is characterized in that: After receiving the feedback signal, the gateway of the gateway subsystem needs to send an ACK confirmation frame to the electronic tag. After sending the ACK confirmation frame, the gateway subsystem forwards the feedback signal to the host computer device.

9. The area passing detection method based on wide area network according to claim 7 is characterized in that: The electronic tag feedback signal is not sent immediately, and the backoff duration needs to be calculated according to the backoff algorithm, where the backoff duration is linearly related to the system time slot length.

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