A monitoring positioning system and a monitoring positioning method
By combining surface acoustic wave devices and passive radio frequency identification technology, the monitoring and positioning system can simultaneously monitor the physical quantity information of the measured point and locate its position without relying on power supply deployment. This solves the problem of difficulty in achieving simultaneous monitoring and positioning in existing technologies, reduces costs, and improves sensitivity and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA TOWER CO LTD
- Filing Date
- 2022-11-17
- Publication Date
- 2026-06-12
Smart Images
Figure CN115796204B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of monitoring technology, and in particular to a monitoring and positioning system and a monitoring and positioning method. Background Technology
[0002] With the rapid development of the information age, fully utilizing information requires not only obtaining reliable information but also accurately monitoring it. Sensors have become the primary means and method for acquiring and monitoring information in the natural and industrial fields. Currently, acquiring monitoring information using sensors requires prior deployment of wiring or connection to a power source. However, when the deployment location changes or becomes dispersed, it becomes difficult to simultaneously achieve the functions of monitoring information and locating the measured point. Summary of the Invention
[0003] This application provides a method and apparatus for determining the target utilization rate of new energy sources, which can solve the problem that existing technologies cannot simultaneously acquire monitoring information and locate the monitoring point.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows:
[0005] In a first aspect, embodiments of this application provide a monitoring and positioning system, the system comprising:
[0006] The first electronic tag is used to store preset information and monitor the physical quantity information of the location of the first electronic tag, and to determine the first frequency point based on the physical quantity information;
[0007] An RFID reader is communicatively connected to the first electronic tag. The RFID reader is used to acquire the physical quantity information and the preset information when operating at the first frequency point, wherein the preset information includes the location information of the first electronic tag.
[0008] Optionally, the first electronic tag includes a surface acoustic wave device and a second electronic tag. The surface acoustic wave device is connected to the second electronic tag. The surface acoustic wave device is used to receive the physical quantity information and determine a first frequency point based on the physical quantity information. The second electronic tag is used to store the preset information.
[0009] Optionally, the RFID reader is further configured to write the second frequency point corresponding to the surface acoustic wave device and the preset information;
[0010] The second frequency point is the frequency point corresponding to the initial physical quantity information of the location of the first electronic tag.
[0011] Optionally, the surface acoustic wave device is a passive device.
[0012] Optionally, the system further includes a terminal connected to the RFID reader via an optical fiber, the terminal being used to control the operating frequency of the RFID reader and to acquire the physical quantity information obtained by the RFID reader.
[0013] Optionally, the system includes at least one of the radio frequency identification (RFID) readers, and the at least one RFID reader is connected to the terminal via optical fiber. The terminal uses a time-division multiplexing mechanism or a frequency-division multiplexing mechanism to control the operating frequency of each RFID reader.
[0014] Optionally, one of the radio frequency identification readers is connected to at least one of the first electronic tags.
[0015] Optionally, the system further includes a wireless relay device, through which the RFID reader is connected to the first electronic tag.
[0016] Optionally, the system further includes a wireless relay device, through which the RFID reader is connected to the first electronic tag.
[0017] Secondly, embodiments of this application also provide a monitoring and positioning method, the method comprising:
[0018] When the RFID reader is operating at the first frequency, physical quantity information and preset information are obtained through the RFID reader, the preset information including the location information of the first electronic tag;
[0019] The location of the first electronic tag is determined based on the location information, and the physical quantity information is associated with the location.
[0020] In this embodiment, a first electronic tag is used to store preset information, and the physical quantity information at the location of the first electronic tag is monitored. Then, an RFID reader is used to obtain the first frequency point corresponding to the physical quantity information monitored by the first electronic tag, and simultaneously reads the preset information within the first electronic tag. In this way, the RFID reader can obtain the physical quantity information monitored by the first electronic tag in real time, and simultaneously obtain the preset information associated with the physical quantity information corresponding to the first frequency point. This embodiment can monitor the physical quantity information at the location of the first electronic tag and simultaneously obtain the preset information associated with the physical quantity information, facilitating installation at various test points and accurate tracking of changes at the test points. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is one of the structural schematic diagrams of a monitoring and positioning system provided in the embodiments of this application;
[0023] Figure 2 This is a curve showing the frequency changing with temperature in the embodiments of this application;
[0024] Figure 3 yes Figure 1 A schematic diagram of the structure of the first electronic tag in China;
[0025] Figure 4 This is a second schematic diagram of the structure of a monitoring and positioning system provided in an embodiment of this application;
[0026] Figure 5 This is the third schematic diagram of a monitoring and positioning system provided in the embodiments of this application;
[0027] Figure 6 This is a flowchart of a monitoring and positioning method provided in an embodiment of this application.
[0028] Figure Labels
[0029] Monitoring and positioning system 10; first electronic tag 11; surface acoustic wave device 111; second electronic tag 112; radio frequency identification reader 12; terminal 13; wireless relay device 14. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.
[0031] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0032] The monitoring and positioning system provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.
[0033] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a monitoring and positioning system provided in an embodiment of this application, as shown below. Figure 1 As shown, the monitoring and positioning system 10 includes:
[0034] The first electronic tag 11 is used to store preset information and monitor the physical quantity information of the location of the first electronic tag 11, and to determine the first frequency point based on the physical quantity information;
[0035] Radio frequency identification (RFID) reader 12 is communicatively connected to the first electronic tag 11. The RFID reader 12 is used to acquire the physical quantity information and the preset information when operating at the first frequency point, wherein the preset information includes the location information of the first electronic tag 11.
[0036] It should be noted that the aforementioned first electronic tag refers to an electronic tag capable of simultaneously storing preset information and monitoring the physical quantity information of the location of the first electronic tag 11. The preset information may include the location information of the first electronic tag, the environmental information of the location where the first electronic tag is monitoring, and detailed information of the object being measured by the first electronic tag 11. The physical quantity information acquired by the first electronic tag 11 is obtained at its actual location, and this specific location information can be stored as preset information within the first electronic tag 11. Generally, the monitoring location of the first electronic tag 11 does not change, and the physical quantity information of the monitored location, specifically the location information, stored within the first electronic tag 11, can be acquired in real time, thereby ensuring the simultaneous effectiveness of monitoring and positioning applications.
[0037] The first electronic tag 11 in this embodiment can be applied to non-contact measurement of sensitive quantities such as wireless passive power temperature measurement, long-distance temperature, and strain. The first electronic tag 11 can use a surface acoustic wave sensor, and the first frequency point can be the frequency point corresponding to the physical quantity information of its location measured by the sensor.
[0038] Specifically, the aforementioned physical quantity information may include at least one of temperature, humidity, gas concentration, pressure, and strain; at least one means that the number of physical quantity information can be one or more. The embodiments of the present invention do not limit the types and number of physical quantity information, and the specific settings are made according to actual needs.
[0039] It should be understood that the aforementioned RFID reader 12 is communicatively connected to the first electronic tag 11. The RFID reader 12 can read the frequency point and stored preset information of the first electronic tag. When its own frequency point is the first frequency point, the RFID reader 12 can operate at the same frequency as the first electronic tag 11. At this time, it can read the preset information stored in the first electronic tag 11 and can also obtain the corresponding physical quantity information based on this first frequency point, which can be determined based on a pre-established frequency versus physical quantity curve.
[0040] Please see Figure 2 , Figure 2 This is a curve showing the resonant frequency changing with temperature in an embodiment of this application, such as... Figure 2 As shown, when the physical quantity information is temperature and the range of the first frequency point is 921 to 922.4 MHz, the corresponding temperature information can be obtained by the change of the first frequency point.
[0041] The monitoring and positioning system 10 provided in this application embodiment includes a first electronic tag 11 and an RFID reader 12. The first electronic tag 11 monitors and determines a first frequency point, and the RFID reader 12 reads the first frequency point and preset information of the first electronic tag 11. Simultaneously, the RFID reader 12 can determine the location of the first electronic tag 11 and its physical quantity information based on the first frequency point. The first electronic tag 11 can be placed at various test points to accurately track changes in the physical quantity information of the test points. The RFID reader 12 can simultaneously acquire the changing physical quantity information and the location of the test point based on the first electronic tag 11. Therefore, the simultaneous acquisition of the physical quantity information and the location of the test point is unrestricted.
[0042] Optionally, the first electronic tag 11 includes a surface acoustic wave device 111 and a second electronic tag 112. The surface acoustic wave device 111 is connected to the second electronic tag 112. The surface acoustic wave device 111 is used to receive the physical quantity information and determine a first frequency point based on the physical quantity information. The second electronic tag 112 is used to store the preset information.
[0043] Please see Figure 3 , Figure 3 yes Figure 1 A schematic diagram of the structure of the first electronic tag in China, as shown below. Figure 3 As shown, the first electronic tag 11 includes a surface acoustic wave device 111 and a second electronic tag 112. Combining the two forms a single first electronic tag 111, enabling miniaturization of the electronic tag to fulfill both monitoring and positioning functions, thus expanding the application range of the monitoring and positioning system 10. Specifically, the first electronic tag can be 20mm × 80mm in size, offering a wide range of applications due to its small size. Simultaneously, utilizing the high sensitivity of the second electronic tag, with a reading distance of up to 30 meters, reduces the number of RFID readers required and lowers the deployment cost of the monitoring and positioning system.
[0044] It is worth mentioning that the first electronic tag 11 in this application includes a surface acoustic wave (SAW) device. The SAW device 111 is a product of the organic combination of surface wave theory in acoustics, piezoelectric research results, and microelectronics technology. Since the propagation speed of SAW is 100,000 times slower than that of electromagnetic waves, and it is easy to sample and process along its propagation path, using SAW to simulate various electronic functions can enable the miniaturization and multifunctionality of electronic devices. The SAW device 111 in this application can be made by fabricating two interdigital transducers on a piezoelectric substrate. The interdigital transducers can form a metallic pattern resembling the crossed fingers of two hands on the surface of the piezoelectric substrate, achieving acoustic-electric energy conversion. The working principle of the aforementioned SAW device 111 is that the input transducer converts the input electrical signal into an acoustic signal through the inverse piezoelectric effect. This acoustic signal propagates along the surface of the substrate, and finally, the output transducer on the substrate converts the acoustic signal into an electrical signal for output. The entire surface acoustic wave device 111 is accomplished by performing various processing on the acoustic signal propagating on the piezoelectric substrate and utilizing the characteristics of the acoustic-electric transducer.
[0045] The aforementioned first electronic tag also includes a second electronic tag 112. The second electronic tag 112 employs a non-contact automatic identification technology, Radio Frequency Identification (RFID), which can automatically identify target objects and acquire relevant data through wireless radio frequency signals. The second electronic tag 112 consists of a coupling element and a chip; each tag has a unique electronic code that can uniquely identify the identified object. The high-capacity second electronic tag 112 has user-writable storage space and can be attached to an object to identify the target object. The second electronic tag in this application can read or write information about the identified object using the aforementioned RFID reader, enabling accurate management of each object among numerous managed objects and reducing the error rate.
[0046] Specifically, the second electronic tag 112 can be a radio frequency identification (RFID) chip with built-in read / write protection. The data pre-stored in this chip can only be read or modified by authorized users and terminal readers. Currently, RFID chips can be divided into two main categories: passive technology chips and active technology chips. This application mainly relates to passive RFID chips. The second electronic tag can obtain the energy required for operation from the magnetic field generated by the RFID reader. It has low cost and a long service life, is smaller and lighter than active tags, and has a shorter read / write distance.
[0047] In this embodiment, the RFID reader acquires the preset information and first frequency point stored in the first electronic tag based on a second electronic tag within the first electronic tag. The second electronic tag can achieve contactless coupling between itself and the RFID reader in the radio frequency signal space through a coupling element. Energy transfer and data exchange can be achieved within the coupling channel according to timing relationships.
[0048] It should be understood that the aforementioned surface acoustic wave (SAW) devices can sense changes in physical quantities and influence resonant motion, thereby altering their own frequency. By combining SAW technology with passive radio frequency identification (RFID) tag technology, a first electronic tag with a unique electronic code is designed. Furthermore, the first electronic tag can leverage the high frequency accuracy characteristic of SAW devices when physical quantities change, making it easy to install on various test points and accurately track and locate changes in the physical quantities at those points.
[0049] For example, the determination of the first frequency point based on physical quantity information in the above system can be based on the surface acoustic wave device 111 within the first electronic tag. This surface acoustic wave device 111 contains a resonator capable of converting the physical quantity information into an acoustic signal before resonating. Taking temperature monitoring as an example, the surface acoustic wave device 111 can sense temperature changes. The cross-energy exchanger on the piezoelectric crystal substrate within the surface acoustic wave device 111 can convert the wireless signal represented by the input physical quantity information into an acoustic signal through the inverse piezoelectric effect, and then resonate through reflection by the two periodic gratings within the surface acoustic wave device 111. When the temperature changes, the surface acoustic wave device 111 in the first electronic tag 11 can sense the temperature change in the surrounding environment and influence the first frequency point of the first electronic tag 11 through the resonance effect. Taking gas concentration monitoring as an example, the surface acoustic wave (SAW) device 111 can also monitor gas characteristics during its design. A gas-sensitive thin film selectively adsorbs gases and can be coated on the surface of the piezoelectric crystal. When this gas-sensitive film interacts with the gas to be measured—this interaction can be chemical, biological, or physical adsorption—it can cause changes in the film's mass and conductivity, thereby causing a drift in the SAW frequency of the piezoelectric crystal. Different gas concentrations result in different degrees of change in film mass and conductivity, which also causes changes in the SAW frequency, thus enabling the first electronic tag 11 to monitor gas characteristics. This allows for accurate acquisition of specific physical quantity information and location of the measured point.
[0050] Optionally, the RFID reader 12 is further configured to write the second frequency point corresponding to the surface acoustic wave device 111 and the preset information;
[0051] The second frequency point is the frequency point corresponding to the initial physical quantity information of the location of the first electronic tag 11.
[0052] In one specific embodiment of this application, the first electronic tag 11 can achieve contactless coupling of radio frequency signals with the RFID reader 12 through a coupling element. Energy transfer and data exchange can be achieved within the coupling channel according to timing relationships. Before the first electronic tag 11 is placed at a monitoring point, initial physical quantity information of the monitoring point can be obtained and written into the surface acoustic wave device 111 using the RFID reader 12. This initial physical quantity information corresponds to a second frequency point. When the physical quantity information of the monitoring point changes, the surface acoustic wave device detects the change, and the second frequency point changes to form a first frequency point. Simultaneously, when writing the initial physical quantity information into the first electronic tag, relevant preset information such as the location information of the measured point can also be written, or preset information can be written in real time according to actual needs.
[0053] Optionally, the surface acoustic wave device 111 is a passive device.
[0054] In one specific embodiment of this application, the surface acoustic wave device 111 is a passive device, capable of reading changes in physical quantity information and presenting them in the form of a first frequency point. Both the surface acoustic wave device 111 in the first electronic tag 11 and the second electronic tag 112 are passive, thus not limited by power supply. When the monitoring environment is unsuitable for power supply or line deployment, the monitoring and positioning effect is guaranteed to remain unaffected. It is widely applicable to various monitoring environments, facilitates the installation of the first electronic tag 11, and easily tracks changes in the physical quantity information of the measured point.
[0055] Optionally, the system further includes a terminal 13, which is connected to the radio frequency identification reader 12 via an optical fiber. The terminal 13 is used to control the operating frequency of the radio frequency identification reader 12 and to obtain the physical quantity information acquired by the radio frequency identification reader 12.
[0056] Please see Figure 4 , Figure 4 This is a second schematic diagram of a monitoring and positioning system structure provided in an embodiment of this application, as shown below. Figure 4 As shown, the monitoring and positioning system 10 in the above embodiment also includes a terminal 13. The terminal 13 and the radio frequency identification (RFID) reader 12 can be connected via optical fiber. The physical quantity information read by the RFID reader 12 and the location information of the first electronic tag 11 that acquires the physical quantity information can be transmitted to the terminal 13. The terminal 13 can also acquire the operating frequency point of the RFID reader 12 that is consistent with the first frequency point, and determine the physical quantity information corresponding to the operating frequency point based on the frequency-physical quantity information correspondence curve in the above embodiment.
[0057] It should be understood that the RFID reader 12 can only read the preset information of the first electronic tag 11 when its operating frequency matches the first frequency of the first electronic tag 11. This objectively realizes the function of a bandpass filter, and in situations such as telecommunications equipment rooms where frequency interference requirements are high, it can reduce the interference of newly deployed first electronic tags 11 on other communication frequencies. Furthermore, during the design phase, impedance matching and other methods can be used to ensure that the change in the resonant frequency within the first electronic tag 11 changes with the change in physical quantity information, exhibiting a linear relationship within a certain range of physical quantity information.
[0058] Optionally, the system includes at least one of the radio frequency identification (RFID) readers 12, and the at least one RFID reader 12 is connected to the terminal 13 via optical fiber. The terminal 13 uses a time-division multiplexing mechanism or a frequency-division multiplexing mechanism to control the operating frequency of each RFID reader 12.
[0059] In another specific embodiment of this application, the monitoring and positioning system 10 may include multiple RFID readers 12, which can be connected via optical fiber. The terminal 13 controls each RFID reader 12 using a time-division multiplexing (TDM) or frequency-division multiplexing (FDM) mechanism. Specifically, the TDM mechanism can control different operating frequencies of each RFID reader 12 at different time periods to achieve multi-channel transmission. TDM uses time as the parameter for signal division, therefore, the signals must not overlap on the time axis. Using a TDM or FDM mechanism allows simultaneous control of multiple RFID readers 12, enabling the monitoring and positioning system 10 to monitor the physical quantity information of multiple measured points in real time.
[0060] Optionally, one of the radio frequency identification readers 12 is connected to at least one of the first electronic tags 11.
[0061] It should be understood that the embodiments of this application can be widely applied to various scenarios requiring monitoring and positioning. Multiple first electronic tags 11 can be set, and one radio frequency identification (RFID) reader 12 can read the frequency points and preset information of multiple first electronic tags 11. More first electronic tags 11 can also be set, with multiple RFID readers 12 corresponding to a portion of the first electronic tags 11. Optionally, the monitoring and positioning system 10 further includes a wireless relay device 14, through which the RFID reader 12 connects to the first electronic tags. In this way, through the actual operation of multiple first electronic tags 11 and multiple RFID readers 12, effective monitoring of a large-scale monitoring environment can be achieved, and changes in physical quantity information can be accurately monitored and located.
[0062] Optionally, the monitoring and positioning system 10 further includes a wireless relay device 14, through which the radio frequency identification reader 12 is connected to the first electronic tag 11.
[0063] Please see Figure 5 , Figure 5 This is the third schematic diagram of a monitoring and positioning system provided in the embodiments of this application, as shown below. Figure 5As shown, the monitoring and positioning system 10 also includes a wireless relay device 14, through which the RFID reader 12 connects to the first electronic tag 11. Based on the aforementioned wireless relay device 14, in situations where the RFID reader 12 and the first electronic tag 11 are too far apart or have obstacles in between, a network connection can be achieved using the wireless relay device 14, providing good security. Furthermore, each RFID reader 12 can correspond to multiple detection points of the first electronic tag 11, enabling plug-and-play functionality, facilitating the expansion of the monitoring and positioning system 10, and simplifying upgrades. Simultaneously, the RFID reader 12 can transmit preset information obtained through the wireless relay device 14 to the terminal via optical fiber, enabling long-distance transmission and more accurate and stable transmission of the first frequency point and preset information.
[0064] Please see Figure 6 , Figure 6 A flowchart of a monitoring and positioning method provided in an embodiment of this application is shown below. Figure 6 As shown, the method includes the following steps:
[0065] Step 21: When the RFID reader 12 is operating at the first frequency point, physical quantity information and preset information are obtained through the RFID reader 12. The preset information includes the location information of the first electronic tag 11.
[0066] Step 22: Determine the location of the first electronic tag 11 based on the location information, and associate the physical quantity information with the location.
[0067] In a specific embodiment of this application, the first electronic tag 11 is placed at the test point for monitoring and positioning. When the working frequency of the radio frequency identification reader 12 is the first frequency, it can acquire the physical quantity information and preset information of the first electronic tag 11. It can simultaneously realize the effective monitoring of the physical quantity information and position of the test point, with higher correlation. It can accurately track the changes in the physical quantity information of the test point without being limited by the position.
[0068] The monitoring and positioning method provided in this application embodiment can achieve the above-mentioned... Figure 1 The various processes implemented in one of the monitoring and positioning system 10 embodiments are not described in detail here to avoid repetition.
[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "preferred embodiment," "detailed description," or "preferred embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0070] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A monitoring positioning system, characterized by include: The first electronic tag is used to store preset information and monitor the physical quantity information of the location of the first electronic tag, and to determine the first frequency point based on the physical quantity information; An RFID reader is communicatively connected to the first electronic tag. The RFID reader is used to acquire the physical quantity information and the preset information when operating at the first frequency point, wherein the preset information includes the location information of the first electronic tag. The first electronic tag includes a surface acoustic wave (SAW) device and a second electronic tag. The SAW device is connected to the second electronic tag. The SAW device is used to receive the physical quantity information and determine a first frequency point based on the physical quantity information. The second electronic tag is used to store the preset information. The RFID reader is also used to write the second frequency point corresponding to the SAW device and the preset information. The second frequency point is the frequency point corresponding to the initial physical quantity information of the location of the first electronic tag.
2. The system according to claim 1, characterized in that, The surface acoustic wave device is a passive device.
3. The system according to claim 1, characterized in that, Also includes: The terminal is connected to the RFID reader via optical fiber. The terminal is used to control the operating frequency of the RFID reader and to obtain the physical quantity information acquired by the RFID reader.
4. The system according to claim 3, characterized in that, The system includes at least one radio frequency identification (RFID) reader, and the at least one RFID reader is connected to the terminal via optical fiber. The terminal uses a time-division multiplexing mechanism or a frequency-division multiplexing mechanism to control the operating frequency of each RFID reader.
5. The system according to claim 4, characterized in that, One of the radio frequency identification readers is connected to at least one of the first electronic tags.
6. The system according to claim 1, characterized in that, The system also includes a wireless relay device, through which the RFID reader is connected to the first electronic tag.
7. A monitoring and positioning method, characterized in that, include: When the RFID reader is operating at the first frequency, physical quantity information and preset information are obtained through the RFID reader, the preset information including the location information of the first electronic tag; The location of the first electronic tag is determined based on the location information, and the physical quantity information is associated with the location. The first electronic tag includes a surface acoustic wave device and a second electronic tag. The surface acoustic wave device is connected to the second electronic tag. The surface acoustic wave device is used to receive the physical quantity information and determine a first frequency point based on the physical quantity information. The second electronic tag is used to store the preset information. The radio frequency identification reader is also used to write the second frequency point corresponding to the surface acoustic wave device and the preset information; The second frequency point is the frequency point corresponding to the initial physical quantity information of the location of the first electronic tag.