Stored article collaborative detection device based on radio frequency identification and intelligent goods shelf

Abstract

The invention relates to the technical field of storage article detection, in particular to a storage article collaborative detection device based on radio frequency identification and an intelligent goods shelf, the device comprises a plurality of RFID antennas, a radio frequency switch matrix, an RFID reader main control board and an upper computer, the plurality of RFID antennas are installed on the two sides of a single row of goods shelf; the radio frequency switch matrix comprises a plurality of first radio frequency switches and a single second radio frequency switch, at least one first radio frequency switch is connected with an RFID antenna on any side of a goods shelf, a connecting channel between the first radio frequency switch and the RFID antenna forms a plurality of radio frequency signal transmission links, and the first radio frequency switches can switch the radio frequency signal transmission links; the second radio frequency switch can switch the first radio frequency switch; the RFID reader main control board is connected with the radio frequency switch matrix; and the upper computer is connected with the RFID reader main control board. According to the invention, the problem of mutual interference between readers and the problem of label collision can be solved, and non-missed-reading detection of the object labels on the intelligent shelf is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of storage article detection, and in particular to a storage article collaborative detection device and a smart shelf based on radio frequency identification. Background Art

[0002] In the application and development of smart shelf systems, radio frequency identification (RFID) technology, with its significant advantages of non-contact, automatic identification and data collection, has significantly improved the convenience and efficiency of item management compared to traditional manual operation methods. The RFID system architecture is mainly composed of a host computer, a reader, and tags attached to items. A single reader can effectively cover and detect all items on its corresponding smart shelf, realizing intelligent statistics and management.

[0003] However, in actual deployment, in order to optimize space utilization, a double-row parallel layout of smart shelves is often used. In this scenario, if the readers of each shelf operate independently, electromagnetic interference between them will cause signal conflicts, which will lead to missed readings and affect the accuracy of item management. At the same time, the tags of items on adjacent shelves may also collide due to their close distance, further exacerbating the recognition problem.

[0004] In response to the above problems, academia and industry have conducted a series of studies to explore improvement solutions. For example, Yu Kuai et al. integrated RFID technology into the storage management of hazardous chemicals, realizing full-chain automated data processing and environmental monitoring from inspection, warehousing, inventory to outbound delivery. Although this solution effectively improved operational efficiency and safety, the method of inventorying with handheld RFID terminals still increased operational risks and labor costs. Du Juan et al. combined embedded platforms, edge computing hosts and RFID technology to propose an intelligent solution for warehouse management of power grid companies, which effectively improved the work efficiency of traditional smart shelves. However, this solution has specific requirements for the location of labels (such as placing them on the bottom of items or requiring special labels), which to a certain extent increases the complexity of item placement and reduces the ease of use of the system. In response to the problem of low efficiency in wafer box search in some wafer factories, Lei Jiabin et al. designed a low-frequency glass tube electronic smart shelf system based on RFID technology, which realized the functions of wafer box storage information query and display on smart shelves, which can effectively improve the wafer box search speed. However, this study did not deeply explore the RFID detection optimization strategy in the environment of double-row parallel smart shelves, and there are still problems such as mutual interference of radio frequency signals and tag recognition collision. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problems of mutual interference between readers and tag recognition collision between double-row shelves in the prior art, and provide a storage item collaborative detection device based on radio frequency identification and a smart shelf. For the item management of a single-row shelf, all items are provided with RFID tags. The storage item collaborative detection device based on radio frequency identification includes:

[0006] A plurality of RFID antennas, wherein the plurality of RFID antennas are installed on both sides of a single row of shelves;

[0007] A radio frequency switch matrix, wherein the radio frequency switch matrix includes a plurality of first radio frequency switches and a single second radio frequency switch, wherein at least one of the first radio frequency switches is connected to an RFID antenna on either side of a shelf, and a connection channel between the two constitutes a plurality of independently controllable radio frequency signal transmission links, wherein the first radio frequency switch can switch the radio frequency signal transmission links; and the second radio frequency switch can switch the first radio frequency switch;

[0008] An RFID reader main control board, the RFID reader main control board is connected to the radio frequency switch matrix;

[0009] and a host computer, the host computer being connected to the RFID reader main control board;

[0010] Among them, the host computer sends a detection instruction to the RFID reader main control board. After receiving the detection instruction, the RFID reader main control board selects any RF signal transmission link through the RF switch matrix to broadcast the activation signal to the RFID tag on the shelf, and receives the RF signal containing the item information generated after the RFID tag is activated. The RFID reader main control board sends the RF signal to the host computer, and the host computer obtains the detection result of the items on the shelf.

[0011] In one embodiment of the present invention, the RFID reader main control board includes a reader module, a radio frequency switch matrix control interface and a radio frequency signal transmission interface, the radio frequency signal transmission interface is connected to the radio frequency communication interface of the radio frequency switch matrix, and is used to send or receive the radio frequency signal of the reader module; the radio frequency switch matrix control interface is connected to the radio frequency switch control interface of the radio frequency switch matrix, and is used to receive the switch on and off control signal of the reader module.

[0012] In one embodiment of the present invention, the reader module is connected to the host computer.

[0013] In one embodiment of the present invention, after receiving the detection instruction from the host computer, the reader module switches to the designated first radio frequency switch through the second radio frequency switch, and then uses the first radio frequency switch to open the radio frequency signal transmission link on one side of the designated shelf layer, the transmitting port of the reader module transmits a part of the activation signal to the RFID tag through the designated radio frequency signal transmission link, and the remaining part of the activation signal is transmitted back to the detection port of the reader module for forward detection, and the radio frequency signal generated after the RFID tag is activated is received, and it is sent to the host computer via the reader module as a first detection result;

[0014] The radio frequency signal is switched to the radio frequency signal transmission link on the other side of the same shelf by switching the radio frequency switch matrix, the returned radio frequency signal is received, and it is returned to the host computer via the reader module as the second detection result. The host computer merges and removes duplicates of the first detection result and the second detection result to obtain an inventory result of the stored items.

[0015] For the management of items on multiple rows of parallel shelves, the present invention also provides a storage item collaborative detection device based on radio frequency identification, where all items are provided with RFID tags, and the device comprises:

[0016] A plurality of RFID antennas, wherein the plurality of RFID antennas are installed on both sides of the plurality of rows of shelves;

[0017] Multiple RF switch matrices, each RF switch matrix includes multiple first RF switches and a single second RF switch, wherein at least one of the first RF switches is connected to the RFID antennas on the same side of any row of shelves, and the connection channels between the two constitute multiple independently controllable RF signal transmission links, and the first RF switch is used for the RF signal transmission links on the same side of multiple rows of shelves; the second RF switch can switch the first RF switch;

[0018] A plurality of RFID reader main control boards, wherein the RFID reader main control boards are connected to the radio frequency switch matrix, and the number of the RFID reader main control boards is the same as the number of the radio frequency switch matrix;

[0019] and a host computer, the host computer being connected to the RFID reader main control board;

[0020] Among them, the host computer sends a detection instruction to the RFID reader main control board. In the host computer control collaborative mode or the external interrupt control collaborative mode, after receiving the detection instruction, the RFID reader main control board selects any RF signal transmission link through the RF switch matrix to broadcast the activation signal to the RFID tag on the shelf, and receives the RF signal containing the item information generated after the RFID tag is activated. The RFID reader main control board sends the RF signal to the host computer to obtain the detection result of the items on the shelf.

[0021] In one embodiment of the present invention, the number of the RFID reader main control board and the number of the RF switch matrix are both two, and the two are connected in a one-to-one correspondence. Each RFID reader main control board includes a reader module, a RF switch matrix control interface and a RF signal transmission interface; wherein the reader module is connected to the host computer, the RF signal transmission interface is connected to the RF communication interface of the RF switch matrix, and is used to send the activation signal of the reader module or receive the RF signal; the RF switch matrix control interface is connected to the RF switch control interface of the RF switch matrix, and is used to receive the switch on / off control signal of the reader module.

[0022] In one embodiment of the present invention, the setting method of the host computer control collaborative mode includes: the host computer selects any one reader module to be configured as a master reader, and the other reader is configured as a slave reader, the master reader transmits an activation signal to the RFID tag through a radio frequency signal transmission link on one side of a designated shelf layer, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated.

[0023] In one embodiment of the present invention, the setting method of the host computer control collaborative mode also includes: after the detection work in the master-slave reader working mode is completed, the host computer configures the current slave reader as the master reader, and the current master reader as the slave reader, the newly configured master reader transmits an activation signal to the RFID tag through the radio frequency signal transmission link on one side of the designated layer shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated.

[0024] In one embodiment of the present invention, the method for setting the external interrupt control collaborative mode includes: two reader modules are connected by a signal line, the host computer selects any one reader module to be configured as a master reader, the master reader sends an interrupt signal to the other reader module through the signal line to configure it as a slave reader, the master reader transmits an activation signal to the RFID tag through a radio frequency signal transmission link on one side of a designated shelf layer, the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated; after the detection work of the slave reader module is completed, the slave reader module is configured as a new master reader, the new master reader sends an interrupt signal to the original master reader module to switch it to a new slave reader.

[0025] The present invention also provides a smart shelf, comprising any one of the above-mentioned radio frequency identification-based storage item collaborative detection devices.

[0026] The above technical solution of the present invention has the following advantages compared with the prior art:

[0027] 1. For the single-row smart shelf layout, the present invention uses a reader and a radio frequency switch matrix to implement a dual-antenna polling detection working mode on each layer of the smart shelf, thereby achieving zero-missing detection of item tags.

[0028] 2. For the double-row parallel smart shelf layout, the present invention utilizes the collaborative working mode of dual readers and dual RF switch matrices to solve the mutual interference problem between readers in a limited space and realize the zero-missing detection of item tags on the smart shelves.

[0029] 3. The collaborative working mode of the reader and the dual RF switch matrix forms space division multiplexing, which can solve the problem in the prior art that due to the short distance between the layers of the shelves, the object tags are prone to collision when being read at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0031] Figure 1 This is a schematic diagram of a double smart shelf side by side;

[0032] Figure 2 It is a schematic diagram of the structure of a storage article detection device for a single-row shelf;

[0033] Figure 3 It is a schematic diagram of the internal structure of the reader module;

[0034] Figure 4 It is a schematic diagram of the structure of the RF switch matrix;

[0035] Figure 5 Schematic diagram of dual readers cooperating to detect the same shelf layer, wherein (a) represents the schematic diagram of dual readers cooperating to detect the same shelf layer when reader R1 is the master reader and reader R2 is the slave reader, and (b) represents the schematic diagram of dual readers cooperating to detect the same shelf layer when reader R1 is the master reader and reader R2 is the slave reader;

[0036] Figure 6 It is a schematic diagram of the structure of the storage article detection device for double-row shelves in the upper computer control coordination mode;

[0037] Figure 7 is to use Figure 6 The flow chart of the device performing polling detection on double-row shelves;

[0038] Figure 8 It is a schematic diagram of the structure of a storage article detection device for double-row shelves in an external interrupt control coordination mode;

[0039] Fig. 9 is to use Figure 8 The flowchart of the device performing polling detection on double-row shelves is shown. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0041] Embodiment 1

[0042] Reference Figure 2 As shown, for a single-row shelf, the present invention provides a storage item collaborative detection device based on radio frequency identification, all items are provided with RFID tags, and the detection device includes:

[0043] A plurality of RFID antennas, wherein the plurality of RFID antennas are installed on both sides of a single row of shelves;

[0044] A radio frequency switch matrix, the radio frequency switch matrix includes a plurality of first radio frequency switches and a single second radio frequency switch, at least one of the first radio frequency switches is connected to the RFID antenna on either side of the shelf, and the connection channel between the two constitutes a plurality of independently controllable radio frequency signal transmission links, the first radio frequency switch can switch the radio frequency signal transmission links; the second radio frequency switch can switch the first radio frequency switch;

[0045] An RFID reader main control board, the RFID reader main control board is connected to the radio frequency switch matrix;

[0046] and a host computer, the host computer being connected to the RFID reader main control board;

[0047] Among them, the host computer sends a detection instruction to the RFID reader main control board. After receiving the detection instruction, the RFID reader main control board selects any RF signal transmission link through the RF switch matrix to broadcast the activation signal to the RFID tag on the shelf, and receives the RF signal containing the item information generated after the RFID tag is activated. The RFID reader main control board sends the RF signal to the host computer, and the host computer obtains the detection result of the items on the shelf.

[0048] In this embodiment, the RFID reader main control board includes a reader module, a radio frequency switch matrix control interface and a radio frequency signal transmission interface, and the reader module is communicatively connected with the host computer via a 485 bus.

[0049] In this embodiment, the RF signal transmission interface is connected to the RF communication interface of the RF switch matrix through a coaxial cable, and is used to send or receive the RF signal of the reader module; the RF switch matrix control interface is connected to the RF switch control interface of the RF switch matrix through a control line, and is used to receive the switch on / off control signal of the reader module.

[0050] Reference Figure 2 and Figure 4 As shown, the number of the first RF switches is two, namely, one for each of the four RF switches B and one for each of the four RF switches C. The four-way coaxial interfaces of the one for each of the four RF switches B and the one for each of the four RFID antennas on the left and right sides of the shelf are connected by coaxial lines respectively. The second RF switch is one for each of the two RF switches A.

[0051] After the reader module receives the detection instruction from the host computer, when different high and low levels are input respectively through the control line of the one-by-two RF switch A, the one-by-two RF switch A switches the RF signal to the corresponding one-by-four RF switch B or one-by-four RF switch C, that is, switches to the RF signal transmission link on the left or right side of the shelf, and then uses the first RF switch to open one of the RF signal transmission links in turn.

[0052] like Figure 3As shown, after the reader module receives the detection instruction, its transmitting port transmits a part of the activation signal to the RFID tag through the radio frequency signal transmission link on one side of the designated shelf layer, and the remaining part of the activation signal is transmitted back to the detection port of the reader module for forward detection to detect whether the power value of the transmission link is within a normal range; the radio frequency signal generated after the RFID tag is activated is received through the designated radio frequency signal transmission link, and it is sent to the host computer via the reader module as the first detection result, completing a round of RFID tag detection;

[0053] By switching the RF switch matrix, the RF signal is switched to the RF signal transmission link on the other side of the same shelf, the returned RF signal is received, and it is transmitted back to the host computer via the reader module as the second detection result. The host computer combines the first detection result and the second detection result for deduplication, obtains the inventory result of the stored items on each shelf, polls the RF signal transmission links on the left and right sides of each shelf, and obtains the detection result of the entire shelf. The above implementation method realizes complementary detection of RFID tags on each layer, reducing the missed detection rate of RFID tags.

[0054] Embodiment 2

[0055] For double-row parallel shelves, the present invention proposes a dual-reader collaborative RFID detection method to inventory the items on the shelves. Dual-reader collaboration means that the readers are different from the previous two readers working independently. Instead, at a certain moment only one reader acts as the main reader, emitting and activating RFID electromagnetic waves and receiving RFID signals at the same time, while the other reader acts as a slave reader and does not emit and activate RFID electromagnetic waves but only receives RFID signals.

[0056] Figure 5 The schematic diagram of using dual readers to work in collaboration to detect items on the same shelf layer is shown in the figure. The readers used are Figure 3 The transceiver integrated reader shown. Figure 5 In (a), reader R1 is the master reader, emitting electromagnetic waves for activating RFID tags and receiving tag echo signals at the same time, while reader R2 is the slave reader, receiving only tag echo signals; Figure 5 In (b), reader R1 is a slave reader that only receives tag echo signals, while reader R2 is a master reader that transmits electromagnetic waves for activating RFID tags and receives electromagnetic wave signals from tags at the same time. The dual-reader collaborative working mode can avoid mutual interference caused by readers emitting electromagnetic waves to activate RFID at the same time, and form a space division multiplexing method to read RFID tags to solve the tag collision problem, realize dual collaborative detection of items on the same shelf layer, improve the accuracy of RFID detection and reduce the missed detection rate.

[0057] Specifically, according to the different master-slave cooperative notification modes of the readers, the present invention also provides a storage item cooperative detection device based on radio frequency identification, which is designed as follows: Figure 6 and Figure 7 The two solutions shown include:

[0058] A plurality of RFID antennas, wherein the plurality of RFID antennas are installed on both sides of the plurality of rows of shelves;

[0059] Multiple RF switch matrices, each RF switch matrix includes multiple first RF switches and a single second RF switch, wherein at least one of the first RF switches is connected to the RFID antennas on the same side of any row of shelves, and the connection channel between the two constitutes multiple RF signal transmission links, and the first RF switch is used for RF signal transmission links of different rows; the second RF switch can switch the first RF switch;

[0060] A plurality of RFID reader main control boards, wherein the RFID reader main control boards are connected to the radio frequency switch matrix, and the number of the RFID reader main control boards is the same as the number of the radio frequency switch matrix;

[0061] and a host computer, the host computer being connected to the RFID reader main control board;

[0062] Among them, the host computer sends a detection instruction to the RFID reader main control board. In the host computer control collaborative mode or the external interrupt control collaborative mode, after receiving the detection instruction, the RFID reader main control board selects any RF signal transmission link through the RF switch matrix to broadcast the activation signal to the RFID tag on the shelf, and receives the RF signal containing the item information generated after the RFID tag is activated. The RFID reader main control board sends the RF signal to the host computer to obtain the detection result of the items on the shelf.

[0063] Furthermore, each RFID reader main control board includes a reader module, a radio frequency switch matrix control interface and a radio frequency signal transmission interface; wherein the reader module is connected to the host computer through a 485 bus, and the radio frequency signal transmission interface is connected to the radio frequency communication interface of the radio frequency switch matrix through a coaxial cable, and is used to send the radio frequency signal of the reader module or receive the return radio wave; the radio frequency switch matrix control interface is connected to the radio frequency switch control interface of the radio frequency switch matrix through a control line, and is used to receive the switch on and off control signal of the reader module.

[0064] In this embodiment, the number of the RFID reader main control board and the number of the radio frequency switch matrix are both two, and the two are connected in a one-to-one correspondence. The RFID reader main control board includes a reader module R1 and a reader module R2, and the radio frequency switch matrix includes a radio frequency switch matrix RF1 and a radio frequency switch matrix RF2, and the reader module R1 is connected to the radio frequency switch matrix RF1, and the reader module R2 is connected to the radio frequency switch matrix RF2.

[0065] Reference Figure 4 , Figure 6 and Figure 7 As shown, each of the RF switch matrices includes two first RF switches (i.e., one-four RF switches B and one-four RF switches C) and one second RF switch (i.e., one-two RF switches A). Each of the four RF switches B and one-four RF switches C is equipped with four coaxial interfaces, which are physically connected to the four RFID antennas on the left and right sides of the shelf through coaxial cables, thereby constructing multiple independently controllable RF signal transmission links in the spatial layout. This design ensures the flexibility and accuracy of signal transmission and supports efficient and interference-free identification and monitoring of RFID tags.

[0066] After the reader module receives the detection instruction from the host computer, when different high and low levels are input through the control line of the one-by-two RF switch A, the one-by-two RF switch A switches the RF signal to the corresponding one-by-four RF switch B or one-by-four RF switch C, that is, switches to the RF signal transmission link on the left or right side of the shelf, and then uses the first RF switch to sequentially open one of the RF signal transmission links of the designated shelf. Through such a control process, the system can flexibly switch RF signals between different areas of the shelf to achieve efficient RFID tag detection and identification.

[0067] The setting method of the host computer control cooperation mode includes: the host computer selects one reader module to enter and configure it as a master reader, and the other reader is configured as a slave reader, the master reader transmits an activation signal to the RFID tag through a radio frequency signal transmission link on one side of a designated shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated;

[0068] After the detection work in the master-slave reader working mode is completed, the host computer configures the current slave reader as the master reader, and the current master reader as the slave reader. The newly configured master reader transmits an activation signal to the RFID tag through the radio frequency signal transmission link on one side of the designated shelf layer, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated.

[0069] Specifically, refer to Figure 6 and Figure 7 As shown, in the host computer control collaborative mode, before performing polling detection, the host computer initializes the system and sets the polling time. The reader module R1 and the reader module R2 each complete the initialization process and enter the standby state, waiting for the next instruction issued by the host computer.

[0070] Once the host computer sends a polling detection command, the system immediately enters the polling detection working state. In this mode, the host computer first sends a detection instruction to the reader module R1 and the reader module R2, instructing them to detect the first layer of the first row of shelves. After receiving the instruction, the reader module R1 and the reader module R2 respectively perform programmed control operations on the RF switch matrix RF1 and the RF switch matrix RF2 associated with them, accurately configure and conduct the RF signal transmission link of the corresponding layer, and ensure that the RF signal can be smoothly transmitted to the target RFID tag.

[0071] Next, the host computer executes the collaborative working mode, configures the reader module R1 as the master reader, and configures the reader module R2 as the slave reader. Under this configuration, the master reader R1 transmits an activation signal to the RFID tag through the RF signal transmission link on one side of the shelf, triggering its response mechanism. At the same time, the master reader R1 and the slave reader R2 both maintain a receiving state, synchronously capturing and receiving the RF signal returned by the RFID tag, which includes the item tag information.

[0072] Subsequently, the master reader R1 and the slave reader R2 upload the tag information they have collected to the host computer. After receiving the tag information from the two readers, the host computer merges and removes duplicates from the initial collaborative detection data to ensure the accuracy and uniqueness of the data.

[0073] After the first merging and deduplication is completed, the host computer performs a master-slave mode switching operation, configuring R2 as the master reader and R1 as the slave reader. The new master reader R2 is responsible for emitting electromagnetic waves to activate the RFID tag, and R1 and R2 synchronously receive the tag signal again to perform RFID tag detection. After the detection is completed, the two readers report the results to the host computer, which again uses the deduplication algorithm to process the data of the secondary collaborative detection. The combined deduplication results of the two collaborative detections are further integrated, and the deduplication operation is performed again, and finally a complete and non-redundant detection result of the first layer of the first row of smart shelves is generated.

[0074] After completing the first layer of detection, the system will continue to poll the second, third, and fourth layers one by one until the detection tasks of all levels of the first row of smart shelves are completed. Then, the system will continue to poll each layer of the second row of smart shelves until all items in the two rows of parallel smart shelves have completed RFID detection without interference and with dual readers.

[0075] After the entire polling detection cycle is completed, the reader modules R1 and R2 automatically return to the waiting state, waiting for the host computer to issue a new round of detection commands according to the preset polling time interval, thereby looping into the next polling detection cycle.

[0076] In summary, the master-slave switching working mode of the reader cleverly solves the mutual interference problem when the readers work independently. It also enhances the signal coverage and receiving sensitivity through the "one send, two receive" detection mechanism, and effectively disperses the signal path through the spatial space division multiplexing effect, significantly reducing the collision probability between RFID tags.

[0077] Furthermore, the setting method of the external interrupt control collaborative mode includes: the reader module R1 and the reader module R2 are interconnected through two signal lines, the host computer selects any one of the reader modules as a master reader, the master reader sends an interrupt signal to the other reader module through the signal line, and configures it as a slave reader, the master reader transmits an activation signal to the RFID tag through a radio frequency signal transmission link on one side of a designated shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated;

[0078] After the detection work of the slave reader module is completed, the slave reader module is configured as a new master reader, and the new master reader sends an interrupt signal to the original master reader module to switch it to the new slave reader.

[0079] Specifically, refer to Figure 8 and Fig. 9 As shown, in the external interrupt control collaborative mode, before starting the polling detection, the host computer performs system initialization and sets the polling time, and the reader module R1 and the reader module R2 each complete the initialization process and enter the standby state, waiting for the next instruction issued by the host computer.

[0080] Once the host computer sends a polling detection command, the system immediately enters the polling detection working state. In this mode, the host computer sends a detection instruction for the first layer of the first row of shelves to the reader module R1 and the reader module R2. After receiving the detection instruction, the reader module R1 and the reader module R2 control the RF switch matrix RF1 and the RF switch matrix RF2 respectively to ensure that the RF signal transmission link of the corresponding layer is turned on during the detection process.

[0081] First, the host computer configures the reader module R1 as the master reader. The master reader R1 transmits an activation signal to the RFID tag through the radio frequency signal transmission link of the first layer of the first row of shelves, and sends an interrupt signal to the reader module R2 through the signal line, configuring it as a slave reader. Then, the master and slave readers synchronously receive the radio frequency signal generated by the activated tag, completing the one-send-two-receive RFID tag detection. The master reader R1 and the slave reader R2 upload the successfully read RFID tag information to the host computer, and the host computer performs the first merge and de-duplicate processing on the tag information.

[0082] After the reader module R2 completes the tag upload as a slave reader, it switches the reader module R1 to a new slave reader through the signal line, and switches itself to a new master reader. The new slave reader R1 turns off the radio frequency signal that activates the RFID tag, and the new master reader R2 transmits an activation signal to the RFID tag through the radio frequency signal transmission link of the first layer of the first row of shelves. Then, the master and slave dual readers synchronously receive the radio frequency signal generated by the activated tag, and then complete a one-send-two-receive RFID tag detection. The new slave reader R1 and the new master reader R2 upload the successfully read RFID tag information to the host computer, and the host computer performs a second merge and deduplication of the tag information. Finally, the host computer merges and deduplications the results of the two collaborative detections again to ensure that the complete and accurate detection results of the items on the first layer of the first row of smart shelves are obtained.

[0083] After completing the double collaborative detection of items on the first layer of the first row of shelves, the system continues to poll the second, third, and fourth layers of labels in sequence until all levels of the first row of shelves have been detected. Subsequently, the second row of shelves is detected according to the same process until all detection tasks of the double-row parallel shelves are completed.

[0084] After all polling detections are completed, reader module R1 and reader module R2 enter a waiting state. When the host computer sends a new polling command according to the set polling time, the system starts the next round of detection, thereby achieving continuous and periodic RFID tag detection.

[0085] In summary, this external interrupt control collaborative mode not only improves the detection efficiency and accuracy of RFID tags through the flexible switching and collaborative work of dual readers and multiple merging and deduplication processing, but also significantly reduces the missed detection rate through dual reader collaborative work and multiple merging and deduplication processing, providing reliable technical support for scenarios such as smart warehousing and logistics management.

[0086] Embodiment 3

[0087] The present invention also provides a smart shelf, including the storage item cooperative detection device based on radio frequency identification described in Example 1 or Example 2. The structure and implementation functions of each component in the storage item detection device are consistent with those in Example 1 or Example 2, so they are not described in detail in this embodiment.

[0088] The smart shelf realizes intelligent and automated management of stored items by integrating a storage item collaborative detection device based on radio frequency identification. Its efficient and accurate detection capability and collaborative working mechanism have brought significant improvements and convenience to the warehousing industry.

[0089] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A storage item collaborative detection device based on radio frequency identification, characterized in that: The single-row shelves are used to manage items, and all items are provided with RFID tags. The device includes: A plurality of RFID antennas, wherein the plurality of RFID antennas are installed on both sides of a single row of shelves; A radio frequency switch matrix, wherein the radio frequency switch matrix includes a plurality of first radio frequency switches and a single second radio frequency switch, wherein at least one of the first radio frequency switches is connected to an RFID antenna on either side of a shelf, and a connection channel between the two constitutes a plurality of independently controllable radio frequency signal transmission links, wherein the first radio frequency switch can switch the radio frequency signal transmission links; and the second radio frequency switch can switch the first radio frequency switch; An RFID reader main control board, the RFID reader main control board is connected to the radio frequency switch matrix; and a host computer, the host computer being connected to the RFID reader main control board; Among them, the host computer sends a detection instruction to the RFID reader main control board. After receiving the detection instruction, the RFID reader main control board selects any RF signal transmission link through the RF switch matrix to broadcast the activation signal to the RFID tag on the shelf, and receives the RF signal containing the item information generated after the RFID tag is activated. The RFID reader main control board sends the RF signal to the host computer, and the host computer obtains the detection result of the items on the shelf.

2. The storage item collaborative detection device based on radio frequency identification according to claim 1, characterized in that: The RFID reader main control board includes a reader module, a radio frequency switch matrix control interface and a radio frequency signal transmission interface, wherein the radio frequency signal transmission interface is connected to the radio frequency communication interface of the radio frequency switch matrix and is used to send or receive the radio frequency signal of the reader module; The RF switch matrix control interface is connected to the RF switch control interface of the RF switch matrix and is used to receive the switch on / off control signal of the reader module.

3. The storage item cooperative detection device based on radio frequency identification according to claim 2 is characterized in that: The reader module is connected to the host computer.

4. The storage item cooperative detection device based on radio frequency identification according to claim 3 is characterized in that: After receiving the detection instruction from the host computer, the reader module switches to the designated first radio frequency switch through the second radio frequency switch, and then uses the first radio frequency switch to sequentially open the radio frequency signal transmission link on one side of the designated shelf layer. The transmitting port of the reader module transmits a part of the activation signal to the RFID tag through the designated radio frequency signal transmission link, and the remaining part of the activation signal is transmitted back to the detection port of the reader module for forward detection. The radio frequency signal generated after the RFID tag is activated is received through the designated radio frequency signal transmission link, and is sent to the host computer via the reader module as a first detection result; The RF signal is switched to the RF signal transmission link on the other side of the same shelf by switching the RF switch matrix, and the returned RF signal is received and sent to the host computer via the reader module as the second detection result. The host computer combines and removes duplicates of the first detection result and the second detection result to obtain an inventory result of the stored items.

5. A storage item collaborative detection device based on radio frequency identification, characterized in that: Items are managed on multiple rows of shelves, and all items are provided with RFID tags. The device includes: A plurality of RFID antennas, wherein the plurality of RFID antennas are installed on both sides of the plurality of rows of shelves; Multiple RF switch matrices, each RF switch matrix includes multiple first RF switches and a single second RF switch, wherein at least one of the first RF switches is connected to the RFID antennas on the same side of any row of shelves, and the connection channels between the two constitute multiple independently controllable RF signal transmission links, and the first RF switch is used for the RF signal transmission links on the same side of multiple rows of shelves; the second RF switch can switch the first RF switch; A plurality of RFID reader main control boards, wherein the RFID reader main control boards are connected to the radio frequency switch matrix, and the number of the RFID reader main control boards is the same as the number of the radio frequency switch matrix; and a host computer, the host computer being connected to the RFID reader main control board; Among them, the host computer sends a detection instruction to the RFID reader main control board. In the host computer control collaborative mode or the external interrupt control collaborative mode, after receiving the detection instruction, the RFID reader main control board selects any RF signal transmission link through the RF switch matrix to broadcast the activation signal to the RFID tag on the shelf, and receives the RF signal containing the item information generated after the RFID tag is activated. The RFID reader main control board sends the RF signal to the host computer, and the host computer obtains the detection result of the item on the shelf.

6. The storage item cooperative detection device based on radio frequency identification according to claim 5, characterized in that: The number of the RFID reader main control board and the number of the RF switch matrix are both two, and the two are connected one-to-one, and each RFID reader main control board includes a reader module, a RF switch matrix control interface and a RF signal transmission interface; Among them, the reader module is connected to the host computer, the RF signal transmission interface is connected to the RF communication interface of the RF switch matrix, and is used to send the activation signal of the reader module or receive the RF signal; the RF switch matrix control interface is connected to the RF switch control interface of the RF switch matrix, and is used to receive the switch on / off control signal of the reader module.

7. The storage item cooperative detection device based on radio frequency identification according to claim 6, characterized in that: The setting method of the host computer control collaborative mode includes: the host computer selects one reader module to be configured as a master reader, and the other reader to be configured as a slave reader, the master reader transmits an activation signal to the RFID tag through a radio frequency signal transmission link on one side of a designated shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated.

8. The storage item cooperative detection device based on radio frequency identification according to claim 7, characterized in that: The setting method of the host computer control collaborative mode also includes: after the detection work in the master-slave reader working mode is completed, the host computer configures the current slave reader as the master reader, and the current master reader as the slave reader, the newly configured master reader transmits an activation signal to the RFID tag through the radio frequency signal transmission link on one side of the designated shelf layer, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated.

9. The storage item cooperative detection device based on radio frequency identification according to claim 6, characterized in that: The setting method of the external interrupt control collaborative mode includes: two reader modules are connected through a signal line, the host computer selects any one reader module to be configured as a master reader, the master reader sends an interrupt signal to the other reader module through the signal line to configure it as a slave reader, the master reader transmits an activation signal to the RFID tag through a radio frequency signal transmission link on one side of a designated shelf, and the master reader and the slave reader synchronously receive the radio frequency signal after the tag is activated; after the detection work of the slave reader module is completed, the slave reader module is configured as a new master reader, and the new master reader sends an interrupt signal to the original master reader module to switch it to a new slave reader.

10. A smart shelf, characterized in that: It comprises the storage item cooperative detection device based on radio frequency identification as described in any one of claims 1 to 4 or the storage item cooperative detection device based on radio frequency identification as described in any one of claims 5 to 9.

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