A method and system for judging the entry and exit of electronic tags based on barrel array antenna

Abstract

The present invention provides a barrel-shaped array antenna and a method and system for realizing electronic tag entry and exit judgment, including: an antenna unit, an annular frame, a multi-channel radio frequency circuit, a master control circuit and a barrel-shaped outer cover; a plurality of the antenna units are sequentially arranged on the annular frame; the multi-channel radio frequency circuit and the master control circuit are arranged inside the annular frame; the antenna unit and the multi-channel radio frequency circuit are connected by radio frequency cables; the antenna unit and the master control circuit are connected by communication cables; the antenna unit, the multi-channel radio frequency circuit and the master control circuit are covered by the barrel-shaped outer cover to protect the antenna unit, the multi-channel radio frequency circuit and the master control circuit. The present invention reduces the difficulty of debugging the antenna reading range in engineering debugging, and does not need to consider too much the problem that the reading areas of the two antennas cannot overlap excessively in the original solution of one data processing terminal supporting two antennas in the industry.

Description

Technical Field

[0001] The present invention relates to the field of intelligent security, and more specifically, to the field of safe campus and home-school interaction. Specifically, it relates to a barrel array antenna and a method and system for realizing electronic tag entry and exit judgment, and more specifically, it relates to a barrel array antenna and a method and system for realizing electronic tag entry and exit judgment based on the barrel array antenna. Background Art

[0002] With the development of RFID (Radio Frequency Identification) technology, 2.45GHz active RFID technology is widely used in the field of home-school interaction to record the attendance of large numbers of students going to and from school over long distances. In addition, 2.45GHz active RFID technology is also used in the management of some valuable or confidential assets to record or monitor the entry and exit of specific areas of these assets.

[0003] The 2.45GHz active RFID technology system is usually composed of an antenna (including a radio frequency circuit and a data processing part) and an electronic tag. The long-distance attendance system in the field of home-school interaction and the valuable (or confidential) asset management system usually use the antenna as the reading end, which is generally composed of a data processing unit and two antennas. During the project implementation, the reading areas of the two antennas should not overlap as much as possible, and then the entry and exit directions are determined according to the order in which the two antennas read the electronic tags; the electronic tags are usually made into the form of electronic student cards, or made into electronic signs for valuable / confidential assets. The reading distance between the antenna and the electronic tag of the 2.45GHz active RFID technology is generally between 50 meters and 100 meters, and some can reach more than 100 meters. The antenna of the 2.45GHz active RFID technology generally uses a flat antenna with a gain of more than 6DBi. According to the shape and polarization direction of the antenna, it is usually divided into horizontal polarization, vertical polarization or circular polarization antenna, and its general coverage area is an irregular sector area. The electronic tag uses low-power technology and is powered by a button battery. It is usually designed to broadcast identity information once every second or so and can generally be used for about three years.

[0004] The problem we are facing now is that it is usually difficult to find an installation position where two antennas do not overlap the reading area at all at the school gate or in the area where valuable (confidential) assets are stored, and this overlapping position is uncertain according to the tag transmission power or tag signal attenuation. Often, a school or valuable (confidential) asset system has been running for many years, and there are new and old electronic student cards or asset labels. At the same time, due to the attenuation of antenna performance caused by the system's years of operation, the uncertainty of non-overlapping reading areas becomes particularly serious. At the same time, in order to take into account both new and old electronic tags, this contradiction is more prominent. Especially in the field of home-school interaction, there will be large-scale campuses. In order to increase the throughput of going to and from school, the gates are usually very wide. In practice, some school gates can reach more than 50 meters. At this time, the sensitivity of the antenna needs to be raised to the highest level to avoid the omission of electronic tags. However, since the reading range of the antenna is an irregular fan-shaped area, this makes it impossible to find the non-overlapping area between the two antennas inside and outside the school during the project implementation, which makes the 2.45GHz active RFID technology long-distance attendance system impossible to implement. When the read / write areas of the two antennas overlap too much, it is often difficult to determine the order in which the dot tags appear, which will cause misjudgment of entry and exit status; reducing the sensitivity of the two antennas and shortening the reading range of the antennas can improve the overlap of the read / write areas of the two antennas to a certain extent, but for larger gates, electronic tags will be missed. Later, it was found that missed judgment and misjudgment are a contradiction, and both are unacceptable.

[0005] In order to solve this problem, this patent proposes an electronic tag entry and exit judgment method based on a barrel array antenna, solving this problem from a combination of hardware and algorithm perspectives.

[0006] Patent document CN109121088A (application number: 201810724248.0) discloses a wireless electronic fence and a method for monitoring the entry and exit of personnel. The wireless electronic fence includes a wireless signal terminal, at least one RFID antenna and a plurality of RFID tags. The RFID antenna is connected to the wireless signal terminal through a signal line. The RFID antenna is arranged in a monitoring area. A main control circuit board is integrated in the wireless signal terminal. An RFID card reader and a wireless communication device are arranged on the main control circuit board. When the RFID tag enters the monitoring area, the identity information of the RFID tag is obtained through the RFID antenna and transmitted to a host computer through the wireless communication device. The identity information of the personnel entering and exiting the monitoring area is identified through the RFID tag and the RFID antenna, and the identity information of the personnel is transmitted to the host computer through the wireless communication device, so that the judgment and identification are performed according to the personnel management system, thereby realizing the management of the entry and exit activities of specific personnel. Summary of the invention

[0007] In view of the defects in the prior art, the purpose of the present invention is to provide a barrel array antenna and a method and system for realizing electronic tag entry and exit judgment.

[0008] A barrel-shaped array antenna provided according to the present invention comprises: an antenna unit, a ring frame, a multi-channel radio frequency circuit, a master control circuit and a barrel-shaped outer cover;

[0009] The plurality of antenna units are sequentially arranged on the annular frame; the multi-channel radio frequency circuit and the master control circuit are arranged inside the annular frame; the antenna unit and the multi-channel radio frequency circuit are connected via radio frequency cables; the antenna unit and the master control circuit are connected via communication cables;

[0010] The antenna unit, the multi-channel radio frequency circuit and the master control circuit are covered by the barrel-shaped outer cover to protect the antenna unit, the multi-channel radio frequency circuit and the master control circuit.

[0011] Preferably, the barrel-shaped outer cover is made of microwave transmission material.

[0012] Preferably, the antenna unit is selected according to gain and directional performance, and the number of barrel array antenna units is determined.

[0013] The present invention provides an electronic tag entry and exit judgment method based on a barrel array antenna, using the barrel array antenna described above to perform the following steps:

[0014] Step M1: Use a barrel array antenna to obtain the signal strength of multiple transmissions of the electronic tag, and record the clock data of each signal transmission;

[0015] Step M2: judging the overall flow direction of the electronic tags based on the signal strengths of the electronic tags transmitted multiple times and the clock data recorded when each signal is transmitted;

[0016] Step M3: Determine the in and out direction of the electronic tag based on the overall flow direction of the electronic tag.

[0017] Preferably, each antenna unit independently collects the signal emitted by the electronic tag.

[0018] Preferably, the step M1 comprises: the master control circuit receives the electronic tag signal strength received by the radio frequency circuit of each antenna unit, and the master control circuit adds a real-time clock to each electronic tag signal.

[0019] Preferably, the step M2 comprises:

[0020] Step M2.1: Eliminate invalid antenna unit data of barrel-shaped array antennas connected end to end to form a data set of valid arc-shaped array antenna units;

[0021] Step M2.2: Filter the signal strength array formed when the electronic tag passes through the single antenna unit, then search for the effective peak value of the signal strength, and record the peak real-time clock;

[0022] Step M2.3: number each antenna unit in the order of mechanical structure position, and record the clock corresponding to the effective peak value of the signal strength received by each antenna unit according to the numbering order;

[0023] Step M2.4: According to the position order of the antenna units, traverse the effective peak clock of each antenna unit and compare it with the effective peak clocks of all subsequent antenna units. When the effective peak clock of the current antenna unit is earlier than the effective peak clocks of all subsequent antenna units, the judgment value is recorded as "1"; when they are equal, the judgment value is recorded as "0"; when it is later than the effective peak clock of the subsequent antenna unit, the judgment value is recorded as "-1".

[0024] Preferably, step M3 includes: summing up all judgment values ​​obtained by comparing the effective peak clocks of all antenna units with the effective peak clocks of all subsequent antenna units; when the sum result is greater than "0", the overall flow direction of the electronic tag is "in"; when the sum result is less than "0", the overall flow direction of the electronic tag is "out"; when the sum result is equal to "0", the overall flow direction of the electronic tag is reciprocating motion, and the result is "appearance".

[0025] According to the electronic tag entry and exit judgment system based on the barrel-shaped array antenna provided by the present invention, the electronic tag entry and exit judgment method based on the barrel-shaped array antenna described above is used to achieve the following functions:

[0026] Module M1: uses a barrel array antenna to obtain the signal strength of multiple transmissions of the electronic tag and records the clock data of each signal transmission;

[0027] Module M2: Determine the overall flow direction of the electronic tags based on the signal strength of the electronic tags transmitted multiple times and the clock data recorded when each signal is transmitted;

[0028] Module M3: Determine the in and out direction of the electronic tag based on the overall flow direction of the electronic tag.

[0029] Preferably, each antenna unit independently collects the signal emitted by the electronic tag;

[0030] The module M1 includes: a master control circuit receives the electronic tag signal strength received by the radio frequency circuit of each antenna unit, and the master control circuit adds a real-time clock to each electronic tag signal;

[0031] The module M2 comprises:

[0032] Module M2.1: Eliminate invalid antenna unit data of barrel-shaped array antennas connected end to end to form a data set of valid arc-shaped array antenna units;

[0033] Module M2.2: Filter the signal strength array formed when the electronic tag passes through the single antenna unit, then search for the effective peak value of the signal strength, and record the peak real-time clock;

[0034] Module M2.3: Number each antenna unit in the order of mechanical structure position, and record the clock corresponding to the effective peak value of the signal strength received by each antenna unit according to the numbering order;

[0035] Module M2.4: According to the position sequence of the antenna units, traverse the effective peak clock of each antenna unit and compare it with the effective peak clocks of all subsequent antenna units. When the effective peak clock of the current antenna unit is earlier than the effective peak clocks of all subsequent antenna units, the judgment value is recorded as "1". If they are equal, the judgment value is recorded as "0". If it is later than the effective peak clock of the subsequent antenna unit, the judgment value is recorded as "-1".

[0036] The module M3 includes: summing up all judgment values ​​obtained by comparing the effective peak clocks of all antenna units with the effective peak clocks of all subsequent antenna units; when the sum result is greater than "0", the overall flow direction result of the electronic tag is "in"; when the sum result is less than "0", the overall flow direction result of the electronic tag is "out"; when the sum result is equal to "0", the overall flow direction of the electronic tag is reciprocating motion, and the result is "appearance".

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention reduces the difficulty of debugging the antenna reading range in engineering debugging, and does not need to consider too much the problem that the reading areas of the two antennas cannot overlap excessively in the original solution of one data processing terminal supporting two antennas in the industry;

[0039] 2. The present invention does not need to care too much about the reading range of each antenna, so the reading range of each antenna can be adjusted to be larger, and can easily take into account the occasions with wider entrances and exits;

[0040] 3. The barrel array antenna of the present invention does not require one data processing terminal to support two antennas, and the amount of engineering wiring and threading is reduced;

[0041] 4. The present invention adopts a barrel array antenna to obtain more electronic tag data, and uses a data stream method to judge entry and exit. The results of electronic tag entry and exit judgment are more stable and less likely to have missed readings and misjudgments. The entire system better solves the industry pain point of missed readings and misjudgments of electronic tags. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0043] Figure 1 It is a schematic diagram of the internal structure of the barrel array antenna;

[0044] Figure 2 This is a schematic diagram of the installation of barrel array antennas at the entrance of units / enterprises;

[0045] Figure 3 This is the flow chart of the overall flow direction judgment algorithm of the electronic tag. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] In order to solve the problem of missed and misjudgment of long-distance attendance of large numbers of students and the entry and exit of valuable (confidential) assets in specific areas in the field of home-school interaction using 2.45GHz active RFID technology, this patent proposes an electronic tag entry and exit judgment method based on a barrel array antenna.

[0048] Example 1

[0049] A barrel-shaped array antenna provided according to the present invention comprises: an antenna unit, a ring frame, a multi-channel radio frequency circuit, a master control circuit and a barrel-shaped outer cover;

[0050] The plurality of antenna units are sequentially arranged on the annular frame; the multi-channel radio frequency circuit and the master control circuit are arranged inside the annular frame; the antenna unit and the multi-channel radio frequency circuit are connected by radio frequency cables; the antenna unit and the master control circuit are connected by communication cables; Figure 1 As shown, the antenna unit and the multi-channel RF circuit are linked by the 50Ω coaxial RF cable marked in the figure; the RF circuit marked in the figure is connected to the main control circuit through a communication cable.

[0051] The antenna unit, the multi-channel radio frequency circuit and the master control circuit are covered by the barrel-shaped outer cover to protect the antenna unit, the multi-channel radio frequency circuit and the master control circuit.

[0052] Specifically, the barrel-shaped outer cover is made of microwave transmission material.

[0053] Specifically, the antenna unit is selected according to gain and directional performance, and the number of barrel array antenna units is determined.

[0054] According to a method for judging the entry and exit of an electronic tag based on a barrel array antenna provided by the present invention, the barrel array antenna described above is used to perform the following steps:

[0055] Step M1: Use a barrel array antenna to obtain the signal strength of multiple transmissions of the electronic tag, and record the clock data of each signal transmission;

[0056] Step M2: judging the overall flow direction of the electronic tags based on the signal strengths of the electronic tags transmitted multiple times and the clock data recorded when each signal is transmitted;

[0057] Step M3: Determine the in and out direction of the electronic tag based on the overall flow direction of the electronic tag.

[0058] Specifically, the number of antenna units of the barrel array antenna is greater than or equal to 3, each antenna unit independently collects the signal emitted by the electronic tag, and there is no special requirement for the consistency of the antenna.

[0059] Specifically, the step M1 includes: the master control circuit receives the electronic tag signal strength received by the radio frequency circuit of each antenna unit, the master control circuit adds a real-time clock to each electronic tag signal, and performs subsequent data processing and algorithm execution.

[0060] The present invention proposes an algorithm for judging the overall flow direction of electronic tags, which is based on three basic rules: a. Eliminate the data of antenna units connected head to tail to ensure that the order of electronic tags follows the general rule that the near-end antenna unit is read first and the far-end antenna unit is read later, and the intermediate antenna units are a gradual process of the reading order of the antenna units at both ends; b. Compared with the original two antennas, the number of antenna units involved in information collection and calculation is increased, the amount of data is increased, the stability of the results of entry and exit judgment is ensured, and the possibility of missed reading and missed judgment is also reduced with the increase in the number of antenna units; c. The effective peak clock signal of the antenna unit is adopted to overcome the influence of individual antennas due to the difference in lobe patterns, the influence of side lobes and the influence of the on-site environment, and reduce the influence of interference or signal jump. Generally speaking, each antenna unit follows the rule that the signal read by the antenna unit will become stronger when the electronic tag is close to the antenna during the process of reading the electronic tag signal. The clock signal at the effective peak moment is adopted to avoid the dependence on the electronic tag signal strength value obtained by the antenna unit. It only needs to find the relative effective peak value, which reduces the requirement for the consistency of each antenna unit. Finally, based on the barrel array antenna hardware foundation and these three basic rules, the overall flow direction of the electronic tags is judged and the entry and exit judgment results are given.

[0061] Specifically, the step M2 includes:

[0062] Step M2.1: Eliminate invalid antenna unit data of barrel-shaped array antennas connected end to end to form a data set of valid arc-shaped array antenna units;

[0063] Step M2.2: Filter the signal strength array formed when the electronic tag passes through the single antenna unit, then search for the effective peak value of the signal strength, and record the peak real-time clock;

[0064] Step M2.3: number each antenna unit in the order of mechanical structure position, and record the clock corresponding to the effective peak value of the signal strength received by each antenna unit according to the numbering order;

[0065] Step M2.4: According to the position order of the antenna units, traverse the effective peak clock of each antenna unit and compare it with the effective peak clocks of all subsequent antenna units. When the effective peak clock of the current antenna unit is earlier than the effective peak clocks of all subsequent antenna units, the judgment value is recorded as "1"; when they are equal, the judgment value is recorded as "0"; when it is later than the effective peak clock of the subsequent antenna unit, the judgment value is recorded as "-1".

[0066] Specifically, step M3 includes: summing up all judgment values ​​obtained by comparing the effective peak clocks of all antenna units with the effective peak clocks of all subsequent antenna units; when the sum result is greater than "0", the overall flow direction of the electronic tag is "in"; when the sum result is less than "0", the overall flow direction of the electronic tag is "out"; when the sum result is equal to "0", the overall flow direction of the electronic tag is reciprocating motion, and the result is "appearance".

[0067] According to the electronic tag entry and exit judgment system based on the barrel array antenna provided by the present invention, the following functions are realized by using the electronic tag entry and exit judgment method based on the barrel array antenna described above:

[0068] Module M1: uses a barrel array antenna to obtain the signal strength of multiple transmissions of the electronic tag and records the clock data of each signal transmission;

[0069] Module M2: Determine the overall flow direction of the electronic tags based on the signal strength of the electronic tags transmitted multiple times and the clock data recorded when each signal is transmitted;

[0070] Module M3: Determine the in and out direction of the electronic tag based on the overall flow direction of the electronic tag.

[0071] Specifically, the number of antenna units of the barrel array antenna is greater than or equal to 3, each antenna unit independently collects the signal emitted by the electronic tag, and there is no special requirement for the consistency of the antenna.

[0072] Specifically, the module M1 includes: a master control circuit receives the electronic tag signal strength received by the radio frequency circuit of each antenna unit, the master control circuit adds a real-time clock to each electronic tag signal, and performs subsequent data processing and algorithm execution.

[0073] The present invention proposes an algorithm for judging the overall flow direction of electronic tags, which is based on three basic rules: a. Eliminate the data of antenna units connected head to tail to ensure that the order of electronic tags follows the general rule that the near-end antenna unit is read first and the far-end antenna unit is read later, and the intermediate antenna units are a gradual process of the reading order of the antenna units at both ends; b. Compared with the original two antennas, the number of antenna units involved in information collection and calculation is increased, the amount of data is increased, the stability of the results of entry and exit judgment is ensured, and the possibility of missed reading and missed judgment is also reduced with the increase in the number of antenna units; c. The effective peak clock signal of the antenna unit is adopted to overcome the influence of individual antennas due to the difference in lobe patterns, the influence of side lobes and the influence of the on-site environment, and reduce the influence of interference or signal jump. Generally speaking, each antenna unit follows the rule that the signal read by the antenna unit will become stronger when the electronic tag is close to the antenna during the process of reading the electronic tag signal. The clock signal at the effective peak moment is adopted to avoid the dependence on the electronic tag signal strength value obtained by the antenna unit. It only needs to find the relative effective peak value, which reduces the requirement for the consistency of each antenna unit. Finally, based on the barrel array antenna hardware foundation and these three basic rules, the overall flow direction of the electronic tags is judged and the entry and exit judgment results are given.

[0074] Specifically, the module M2 includes:

[0075] Module M2.1: Eliminate invalid antenna unit data of barrel-shaped array antennas connected end to end to form a data set of valid arc-shaped array antenna units;

[0076] Module M2.2: Filter the signal strength array formed when the electronic tag passes through the single antenna unit, then search for the effective peak value of the signal strength, and record the peak real-time clock;

[0077] Module M2.3: Number each antenna unit in the order of mechanical structure position, and record the clock corresponding to the effective peak value of the signal strength received by each antenna unit according to the numbering order;

[0078] Module M2.4: According to the position order of the antenna units, traverse the effective peak clock of each antenna unit and compare it with the effective peak clocks of all subsequent antenna units. When the effective peak clock of the current antenna unit is earlier than the effective peak clocks of all subsequent antenna units, the judgment value is recorded as "1". When they are equal, the judgment value is recorded as "0". When it is later than the effective peak clock of the subsequent antenna unit, the judgment value is recorded as "-1".

[0079] Specifically, the module M3 includes: summing up all judgment values ​​obtained by comparing the effective peak clocks of all antenna units with the effective peak clocks of all subsequent antenna units; when the sum result is greater than "0", the overall flow direction of the electronic tag is "in"; when the sum result is less than "0", the overall flow direction of the electronic tag is "out"; when the sum result is equal to "0", the overall flow direction of the electronic tag is reciprocating motion, and the result is "appearance".

[0080] Example 2

[0081] Example 2 is a variation of Example 1

[0082] See also Figure 1 , which shows a schematic diagram of the internal structure of the barrel array antenna in the present invention. Its implementation mainly includes the following steps:

[0083] Step 1: Select an antenna with appropriate gain and directional performance as required, and determine the number of barrel array antenna units.

[0084] Step 2: Design an internal ring frame and fix all antennas on the ring frame in sequence, and number the antenna units in sequence (either clockwise or counterclockwise).

[0085] Step 3: Design a multi-channel RF circuit and a data processing master control circuit to match the antenna unit, fix the RF circuit and the master control circuit to the inside of the ring frame, and connect the RF cable and communication cable.

[0086] Step 4, design a barrel-shaped outer cover with an outer surface suitable for microwave transmission materials, and use the outer cover to cover the antenna unit and the internal circuit to protect the internal antenna unit and the electronic control circuit.

[0087] See also Figure 2 , which shows a schematic diagram of the installation of the barrel array antenna in the present invention at the gate. After the barrel array antenna is developed, the scenarios in engineering implementation are usually as follows Figure 2 As shown, the barrel array antenna is usually installed on the wall on one side of the gate (it can be hung on the side wall of the sentry box when there is one). When the gate is opened, the area where the electronic tag passes through is basically a pillow-shaped area, that is, there are five possible paths for the electronic tag to enter: 1. Enter from the near end of the barrel array antenna and leave from the near end; 2. Enter from the near end of the barrel array antenna and leave from the far end; 3. Enter from the far end of the barrel array antenna and leave from the near end; 4. Enter from the far end of the barrel array antenna and leave from the far end; 5. Enter directly from the middle area of ​​the pillow area. The situation of the electronic tag going out is the reverse process of coming in, and the situation is similar, and there are also five situations.

[0088] See also Figure 3 , which is a flow chart of the overall flow direction judgment algorithm of the electronic tag in the present invention. Its implementation mainly includes the following steps:

[0089] Step 1: Obtain the signal strength and clock data obtained by each antenna unit of the barrel array antenna when a specific electronic tag passes through the pincushion area. Assume that the signal data of a single transmission of a specific electronic tag obtained by a single antenna is A[s,t], where A represents a certain antenna, s represents the signal strength received by the antenna when it reads a signal transmitted by a specific tag, and t represents the clock when the antenna reads the signal.

[0090] Assume that the barrel array antenna has a total of n antenna units, that is, the antenna units are ANT1, ANT2…ANT n When a tag passes through the barrel array antenna, each antenna unit will read the signal of the specific tag multiple times. The number of times different antennas read is different. Therefore, the total signal of a specific electronic tag read by a certain antenna can be recorded as A. i {[s1,t1],[s2,t2]…[s m ,t m ]}, where i represents the i-th antenna unit and m represents a total of m signals read for a specific tag.

[0091] Step 2: Remove invalid antenna unit data based on experience. According to the installation diagram of the barrel array antenna at the gate, based on engineering experience, the antenna units that often intersect with the wall (or the side wall of the sentry box) are connected end to end and have insufficient distinction. The data of this antenna unit needs to be removed. Assuming 1<j<k<n, define [ANT1,…,ANT j-1 ] and [ANT k+1 ,…,ANT n ] data needs to be eliminated, then the antenna unit data for effective parameter calculation is [ANT j ,…,ANT k ].

[0092] Step 3: Filter the data of a specific electronic tag for a single antenna unit and search for effective peaks. Assuming j≤i≤k, filter the data of the ith antenna according to the signal strength (mean filtering, median filtering, or other weighted sliding filtering can be selected according to the signal characteristics) to remove jitter and jump signals, then the data before filtering A i {[s1,t1],[s2,t2]…[s m ,t m ]} is transformed into the filtered filter A i {[s new1 ,t new1 ],[s new2 ,tnew2 ]…[s newm ,t newm ]}, where the suffix new indicates the value after filtering. i {[s new1 ,t new1 ],[s new2 ,t new2 ]…[s newm ,t newm ]}, perform peak search based on the signal strength after filtering, and the effective peak of the i-th antenna unit is recorded as A i [s i ,t i ]=max{[s new1 ,t new1 ],[s new2 ,t new2 ]…[s newm ,t newm ]}.

[0093] Step 4: Construct an effective peak clock sequence according to the order of antenna unit numbers. j ,…,ANT k ] antenna unit, assuming j≤i<l≤k, its effective peak sequence is constructed as, [A j [s j ,t j ],…,A i [s i ,t i ],…A l [s l ,t l ],…,A k [s k ,t k ]], then participate in the calculation of [ANT j ,…,ANT k The effective peak clock sequence of the antenna unit is constructed as [t j ,…,t i ,…t l ,…,t k ].

[0094] Step 5, the overall flow direction judgment algorithm of the electronic tag. Assume that j≤i<l≤k, where i represents any antenna unit between j and k. Assume that the earlier or later situation of the effective peak clock of the previous antenna and the effective peak clock of any subsequent antenna is counted as x, and define that the effective peak clock of the previous antenna is counted as "1" when it is earlier than the effective peak clock of any subsequent antenna, "0" when it is equal, and "-1" when it is later, and the expression is:

[0095]

[0096] Continue to construct the clock order judgment result matrix of the effective peak clock sequence:

[0097]

[0098] Finally, x il To sum,

[0099] Step 5: Output the judgment result. The judgment result f(x) in the previous step can reflect the overall flow direction of the electronic tag, that is, When multiple electronic tags pass through, they only need to be classified according to their ID numbers, and the method of the present invention can be used to determine the entry and exit status of multiple electronic tags when they pass through the barrel array antenna.

[0100] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0101] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0102] Those skilled in the art know that, in addition to implementing the system, device and its various modules provided by the present invention in a purely computer-readable program code, it is entirely possible to implement the same program in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded microcontrollers by logically programming the method steps. Therefore, the system, device and its various modules provided by the present invention can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures within the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing the method and structures within the hardware component.

[0103] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for judging the entry and exit of an electronic tag based on a barrel array antenna, characterized in that: Perform the following steps using the barrel array antenna: Step M1: Use a barrel array antenna to obtain the signal strength of multiple transmissions of the electronic tag, and record the clock data of each signal transmission; Step M2: judging the overall flow direction of the electronic tags according to the signal strengths of the electronic tags transmitted multiple times and the clock data recorded when each signal is transmitted; Step M3: Determine the in and out direction of the electronic tag based on the overall flow direction of the electronic tag; The barrel-shaped array antenna is characterized by comprising: an antenna unit, a ring frame, a multi-channel radio frequency circuit, a master control circuit and a barrel-shaped outer cover; The plurality of antenna units are sequentially arranged on the annular frame; the multi-channel radio frequency circuit and the master control circuit are arranged inside the annular frame; the antenna unit and the multi-channel radio frequency circuit are connected through radio frequency cables; the antenna unit and the master control circuit are connected through communication cables; and the radio frequency cables and the communication cables are connected; The antenna unit, the multi-channel radio frequency circuit and the master control circuit are covered by the barrel-shaped outer cover to protect the antenna unit, the multi-channel radio frequency circuit and the master control circuit; The step M2 comprises: Step M2.1: Eliminate invalid antenna unit data of barrel-shaped array antennas connected end to end to form a data set of valid arc-shaped array antenna units; Step M2.2: Filter the signal strength array formed when the electronic tag passes through the single antenna unit, then search for the effective peak value of the signal strength, and record the peak real-time clock; Step M2.3: number each antenna unit in the order of mechanical structure position, and record the clock corresponding to the effective peak value of the signal strength received by each antenna unit according to the numbering order; Step M2.4: According to the position sequence of the antenna units, traverse the effective peak clock of each antenna unit and compare it with the effective peak clocks of all subsequent antenna units. When the effective peak clock of the current antenna unit is earlier than the effective peak clocks of all subsequent antenna units, the judgment value is recorded as "1". When they are equal, the judgment value is recorded as "0". When it is later than the effective peak clock of the subsequent antenna unit, the judgment value is recorded as "-1". The step M3 includes: summing up all judgment values ​​obtained by comparing the effective peak clocks of all antenna units with the effective peak clocks of all subsequent antenna units; when the sum result is greater than "0", the overall flow direction result of the electronic tag is "in"; when the sum result is less than "0", the overall flow direction result of the electronic tag is "out"; when the sum result is equal to "0", the overall flow direction of the electronic tag is reciprocating motion, and the result is "appearance".

2. The method for judging the entry and exit of an electronic tag based on a barrel-shaped array antenna according to claim 1 is characterized in that: The barrel-shaped outer cover is made of microwave transmission material.

3. The method for judging the entry and exit of an electronic tag based on a barrel-shaped array antenna according to claim 1, characterized in that: The antenna unit is selected according to gain and directional performance, and the number of barrel array antenna units is determined.

4. The method for judging the entry and exit of an electronic tag based on a barrel-shaped array antenna according to claim 1, characterized in that: Each antenna unit independently collects the signal emitted by the electronic tag.

5. The method for judging the entry and exit of an electronic tag based on a barrel-shaped array antenna according to claim 4 is characterized in that: The step M1 includes: the master control circuit receives the electronic tag signal strength received by the radio frequency circuit of each antenna unit, and the master control circuit adds a real-time clock to each electronic tag signal.

6. An electronic tag entry and exit judgment system based on a barrel array antenna, characterized in that: The following functions are achieved by using the electronic tag entry and exit judgment method based on the barrel array antenna described in any one of claims 1 to 5: Module M1: uses a barrel array antenna to obtain the signal strength of multiple transmissions of the electronic tag and records the clock data of each signal transmission; Module M2: Determine the overall flow direction of the electronic tags based on the signal strength of the electronic tags transmitted multiple times and the clock data recorded when each signal is transmitted; Module M3: Determine the in and out direction of the electronic tag based on the overall flow direction of the electronic tag.

7. The electronic tag entry and exit judgment system based on barrel array antenna according to claim 6 is characterized in that: Each antenna unit independently collects the signal transmitted by the electronic tag; The module M1 includes: a master control circuit receives the electronic tag signal strength received by the radio frequency circuit of each antenna unit, and the master control circuit adds a real-time clock to each electronic tag signal; The module M2 comprises: Module M2.1: Eliminate invalid antenna unit data of barrel-shaped array antennas connected end to end to form a data set of valid arc-shaped array antenna units; Module M2.2: Filter the signal strength array formed when the electronic tag passes through the single antenna unit, then search for the effective peak value of the signal strength, and record the peak real-time clock; Module M2.3: Number each antenna unit in the order of mechanical structure position, and record the clock corresponding to the effective peak value of the signal strength received by each antenna unit according to the numbering order; Module M2.4: According to the position sequence of the antenna units, traverse the effective peak clock of each antenna unit and compare it with the effective peak clocks of all subsequent antenna units. When the effective peak clock of the current antenna unit is earlier than the effective peak clocks of all subsequent antenna units, the judgment value is recorded as "1". If they are equal, the judgment value is recorded as "0". If it is later than the effective peak clock of the subsequent antenna unit, the judgment value is recorded as "-1". The module M3 includes: summing up all judgment values ​​obtained by comparing the effective peak clocks of all antenna units with the effective peak clocks of all subsequent antenna units; when the sum result is greater than "0", the overall flow direction result of the electronic tag is "in"; when the sum result is less than "0", the overall flow direction result of the electronic tag is "out"; When the sum is equal to "0", the overall flow direction of the electronic tag is reciprocating motion, and the result is "appearance".

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