A method and device for measuring link loss

Abstract

The present invention provides a link loss measurement method and device, which are applied to the field of mobile communications. The method comprises: obtaining a critical transmission power value of an activated RFID antenna tag, an activation power parameter value of the RFID antenna tag, and a target standing wave ratio of the RFID antenna link; obtaining a target power loss value of the RFID antenna link according to the target standing wave ratio; determining the link loss of the RFID antenna according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link, and the activation power parameter value of the RFID antenna tag. The method calculates the target power loss value caused by the target standing wave ratio of the RFID antenna link, and then determines the link loss of the RFID antenna by activating the critical transmission power value of the RFID antenna tag, the target power loss value of the RFID antenna link, and the activation power parameter value of the RFID antenna tag, taking into account the measurement error caused by the standing wave ratio, thereby improving the accuracy of the link loss measurement method.

Description

Technical Field

[0001] The present application relates to the field of mobile communications, and in particular to a link loss measurement method and device. Background Art

[0002] Indoor antenna distribution systems are mainly represented by passive distribution systems. In order to solve the problem that traditional passive distribution system equipment is unmanageable and uncontrollable, RFID smart indoor distribution systems have gradually been introduced in recent years. They integrate RFID technology with passive distribution systems, introduce RFID gateways and RFID tags, etc., thereby realizing the monitoring of passive indoor distribution system faults.

[0003] The monitoring of passive indoor distributed systems is mainly the monitoring of link loss. In order to measure link loss, the RFID gateway needs to determine the critical transmission power of activating RFID tags. However, in the existing link loss measurement method, due to the existence of the voltage standing wave ratio of the indoor distributed system, the measured critical transmission power of the RFID gateway activated tag is not completely equal to the actual critical activation power of the RFID tag, resulting in low accuracy of the link loss measurement method. Summary of the invention

[0004] The embodiments of the present application provide a link loss measurement method and device to solve the problem of low accuracy of existing link loss measurement methods.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a method for measuring link loss. The method includes:

[0007] Obtaining a critical transmission power value for activating an RFID antenna tag, an activation power parameter value of the RFID antenna tag, and a target standing wave ratio of the RFID antenna link;

[0008] According to the target standing wave ratio of the RFID antenna link, obtaining a target power loss value of the RFID antenna link;

[0009] The link loss of the RFID antenna is determined according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link and the activation power parameter value of the RFID antenna tag.

[0010] Optionally, obtaining a critical transmission power value for activating the RFID antenna tag includes:

[0011] Transmitting a first signal to activate the RFID antenna tag;

[0012] When a response signal from the RFID antenna tag is obtained, the transmission power value of the first signal is reduced to obtain a critical transmission power value for activating the RFID antenna tag.

[0013] Optionally, a detection point is provided at a signal input end of each preset device in the RFID antenna link, and obtaining a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link comprises:

[0014] Obtaining the standing wave ratio of each detection point in the RFID antenna link;

[0015] Obtaining power loss values ​​corresponding to the respective detection points according to the standing wave ratios of the respective detection points;

[0016] The power loss values ​​corresponding to the various detection points are added together to obtain a target power loss value of the RFID antenna link.

[0017] Optionally, a target detection point is provided at a signal input end of an RFID combiner in the RFID antenna link, and acquiring a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link comprises:

[0018] Obtaining the standing wave ratio of the target detection point in the RFID antenna link;

[0019] According to the standing wave ratio of the target detection point, a target power loss value of the RFID antenna link is obtained.

[0020] Optionally, acquiring a target power loss value of the RFID antenna link according to the standing wave ratio of the target detection point includes:

[0021] Obtain target parameters, wherein the target parameters include a first value, a second value, a third value, a fourth value, and a fifth value, wherein the first value is a preset value of the number of devices in the RFID antenna link that have standing wave anomalies, the second value is a value of the number of devices in the RFID antenna link, the third value is a value of the number of devices in the indoor distributed system where the RFID antenna is located, the fourth value is a probability value of the devices in the RFID antenna link having standing wave anomalies, and the fifth value is a probability increase value of the devices in the RFID antenna link having standing wave anomalies due to working hours;

[0022] According to the target parameter, correct the standing wave ratio of the target detection point;

[0023] According to the corrected standing wave ratio of the target detection point, a target power loss value of the RFID antenna link is obtained.

[0024] In a second aspect, an embodiment of the present application further provides a link loss measurement device. The link loss measurement device comprises:

[0025] A first acquisition module is used to acquire a critical transmission power value for activating an RFID antenna tag, an activation power parameter value of the RFID antenna tag, and a target standing wave ratio of the RFID antenna link;

[0026] A second acquisition module, configured to acquire a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link;

[0027] The first determination module is used to determine the link loss of the RFID antenna according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link and the activation power parameter value of the RFID antenna tag.

[0028] Optionally, the second acquisition module includes:

[0029] A first transmitting unit, configured to transmit a first signal to activate the RFID antenna tag;

[0030] The first acquisition unit is used to reduce the transmission power value of the first signal and acquire a critical transmission power value for activating the RFID antenna tag when a response signal from the RFID antenna tag is acquired.

[0031] Optionally, a detection point is provided at a signal input end of each preset device in the RFID antenna link, and the second acquisition module includes:

[0032] A second acquisition unit, used to acquire the standing wave ratio of each detection point in the RFID antenna link;

[0033] A third acquisition unit, configured to acquire a power loss value corresponding to each detection point according to the standing wave ratio of each detection point;

[0034] The first determining unit is used to add the power loss values ​​corresponding to the respective detection points to obtain a target power loss value of the RFID antenna link.

[0035] Optionally, a target detection point is provided at a signal input end of the RFID combiner in the RFID antenna link, and the second acquisition module includes:

[0036] A fourth acquisition unit, configured to acquire a standing wave ratio of the target detection point in the RFID antenna link;

[0037] The fifth acquisition unit is used to acquire the target power loss value of the RFID antenna link according to the standing wave ratio of the target detection point.

[0038] Optionally, the fifth acquiring unit includes:

[0039] A first acquisition subunit is used to acquire a target parameter, wherein the target parameter includes a first value, a second value, a third value, a fourth value, and a fifth value, wherein the first value is a preset value of the number of devices in the RFID antenna link that have standing wave anomalies, the second value is a value of the number of devices in the RFID antenna link, the third value is a value of the number of devices in the room distribution system where the RFID antenna is located, the fourth value is a probability value of the devices in the RFID antenna link having standing wave anomalies, and the fifth value is a probability increase value of the devices in the RFID antenna link having standing wave anomalies due to working hours;

[0040] A first correction subunit, used for correcting the standing wave ratio of the target detection point according to the target parameter;

[0041] The first determination subunit is used to obtain a target power loss value of the RFID antenna link according to the corrected standing wave ratio of the target detection point.

[0042] In a third aspect, an embodiment of the present application also provides a link loss measurement device, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the steps of the above-mentioned link loss measurement method when executed by the processor.

[0043] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned link loss measurement method are implemented.

[0044] The link loss measurement method of the embodiment of the present application obtains the critical transmission power value of the activated RFID antenna tag, the activation power parameter value of the RFID antenna tag, and the target standing wave ratio of the RFID antenna link; according to the target standing wave ratio, obtains the target power loss value of the RFID antenna link; according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link, and the activation power parameter value of the RFID antenna tag, the link loss of the RFID antenna is determined. This method calculates the target power loss value caused by the target standing wave ratio of the RFID antenna link, and then determines the link loss of the RFID antenna by activating the critical transmission power value of the RFID antenna tag, the target power loss value of the RFID antenna link, and the activation power parameter value of the RFID antenna tag, taking into account the measurement error caused by the standing wave ratio, thereby improving the accuracy of the link loss measurement method. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0046] Figure 1 This is one of the flow charts of the link loss measurement method provided in the embodiment of the present application;

[0047] Figure 2 It is one of the schematic diagrams of the RFID antenna link in the link loss measurement method provided in the embodiment of the present application;

[0048] Figure 3 This is the second flowchart of the link loss measurement method provided in the embodiment of the present application;

[0049] Figure 4 This is the second schematic diagram of the RFID antenna link in the link loss measurement method provided in the embodiment of the present application;

[0050] Figure 5 This is one of the example schematic diagrams of the link loss measurement method provided in the embodiment of the present application;

[0051] Figure 6 This is the second example schematic diagram of the link loss measurement method provided in the embodiment of the present application;

[0052] Figure 7 This is the third flowchart of the link loss measurement method provided in the embodiment of the present application;

[0053] Figure 8 is a schematic diagram of a link loss measurement device provided by another embodiment of the present application;

[0054] Fig. 9 This is a schematic diagram of an electronic structure provided by another embodiment of the present application. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The present application embodiment provides a link loss measurement method. Figure 1 , Figure 1is a flow chart of the link loss measurement method provided in an embodiment of the present application, such as Figure 1 As shown, the following steps are included:

[0057] Step 101, obtaining a critical transmission power value for activating an RFID antenna tag, an activation power parameter value of the RFID antenna tag, and a target standing wave ratio of the RFID antenna link;

[0058] Step 102: acquiring a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link;

[0059] Step 103: Determine the link loss of the RFID antenna according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link, and the activation power parameter value of the RFID antenna tag.

[0060] See also Figure 2 In the existing link loss measurement method, the link loss of the RFID antenna = the critical transmission power value of the activated RFID antenna tag - the activation power parameter value of the RFID antenna tag. However, in actual applications, due to the existence of the standing wave ratio, the power transmitted by the RFID gateway is reflected and the actual power is lost, resulting in the measured critical transmission power value of the activated RFID antenna tag not being completely equal to the actual critical transmission power value of the RFID antenna tag. Therefore, the measured link loss of the RFID antenna is far from the actual link loss of the RFID antenna.

[0061] In the link loss measurement method of the embodiment of the present application, an RFID sensor is added at a key position of the RFID antenna link to obtain the standing wave ratio of the link. The target standing wave ratio of the RFID antenna link measured by the RFID sensor is used to calculate the target power loss value of the RFID antenna link caused by the target standing wave ratio of the RFID antenna link, and the link loss of the RFID antenna is obtained = the critical transmission power value of the activated RFID antenna tag - the target power loss value of the RFID antenna link - the activation power parameter value of the RFID antenna tag, and the activation power parameter value of the RFID antenna tag is the factory test value of the RFID antenna.

[0062] The link loss measurement method of the embodiment of the present application calculates the target power loss value caused by the target standing wave ratio of the RFID antenna link, and then determines the link loss of the RFID antenna by activating the critical transmission power value of the RFID antenna tag, the target power loss value of the RFID antenna link and the activation power parameter value of the RFID antenna tag. The measurement error caused by the standing wave ratio is taken into account, thereby improving the accuracy of the link loss measurement method.

[0063] Optionally, obtaining a critical transmission power value for activating the RFID antenna tag includes:

[0064] Transmitting a first signal to activate the RFID antenna tag;

[0065] When a response signal from the RFID antenna tag is obtained, the transmission power value of the first signal is reduced to obtain a critical transmission power value for activating the RFID antenna tag.

[0066] In the link loss measurement method of the embodiment of the present application, see Figure 2 Schematic diagram of RFID antenna link, the RFID gateway first transmits signals with a relatively large initial power, that is, transmits a first signal to activate the RFID antenna tag, and then tries to continuously reduce the power of the first signal in smaller steps to transmit again when ensuring that the response signal of the RFID antenna tag is received, until the response signal of the RFID antenna tag is not received, it is confirmed that the previous power is the critical power of the RFID antenna tag; if the RFID gateway first transmits signals with a relatively large initial power, that is, transmits a first signal to activate the RFID antenna tag, if the response signal of the RFID antenna tag is not received, it will try to continuously increase the power of the first signal in smaller steps to transmit again until the response signal of the RFID antenna tag is received, it is confirmed that the current power is the critical power of the RFID antenna tag.

[0067] The method obtains the critical transmission power value of the activated RFID antenna tag in a variable power manner, thereby more accurately calculating the link loss of the RFID antenna and improving the accuracy of the link loss measurement method.

[0068] Optionally, a detection point is provided at a signal input end of each preset device in the RFID antenna link, and obtaining a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link comprises:

[0069] Obtaining the standing wave ratio of each detection point in the RFID antenna link;

[0070] Obtaining power loss values ​​corresponding to the respective detection points according to the standing wave ratios of the respective detection points;

[0071] The power loss values ​​corresponding to the various detection points are added together to obtain a target power loss value of the RFID antenna link.

[0072] In the link loss measurement method of the embodiment of the present application, a detection point is set at the signal input end of each preset device in the RFID antenna link to detect the preset device and the link standing wave ratio thereafter. It should be noted that although the RFID sensor at each detection point will detect the link standing wave ratio thereafter, it actually reflects the standing wave ratio of the nearby position. If a standing wave abnormality occurs at the far end, it is difficult to be truly reflected. The aforementioned preset device is a device with relatively large loss. Figure 2 and Figure 3 , the RFID gateway first transmits a first signal with a power of T to activate the RFID antenna tag, and then continuously reduces the transmission power of the first signal to obtain the critical transmission power value P1 for activating the RFID antenna tag. The RFID gateway detects the standing wave ratio VSWR through RFID sensor a, RFID sensor b, and RFID sensor c respectively. a VSWR b and VSWR c , and then calculate the power loss value caused by the corresponding standing wave ratio Then, the power loss values ​​corresponding to each detection point are added together to finally obtain the power loss value Ls of the RFID antenna link, and then the power loss value of the RFID antenna link is obtained by obtaining the activation power parameter value P0 of the RFID antenna tag.

[0073] The method measures the standing wave ratio at multiple detection points in the RFID antenna link, and then calculates the power loss caused by the corresponding standing wave ratio, so as to more accurately obtain the power loss value of the RFID antenna link, thereby improving the accuracy of the link loss measurement method.

[0074] Optionally, a target detection point is provided at a signal input end of an RFID combiner in the RFID antenna link, and acquiring a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link comprises:

[0075] Obtaining the standing wave ratio of the target detection point in the RFID antenna link;

[0076] According to the standing wave ratio of the target detection point, a target power loss value of the RFID antenna link is obtained.

[0077] In the link loss measurement method of the embodiment of the present application, the adjacent position before the RFID combiner in the RFID antenna link is selected as the target detection point, and the standing wave ratio measured by the RFID sensor at the target detection point is obtained, see Figure 4The selected target reference point is located before the RFID combiner, that is, the initial position of the link where the RFID antenna is located, which can represent the overall standing wave ratio VSWR of the indoor distributed system where the RFID antenna is located. system , the target power loss value of the RFID antenna link is obtained by using the standing wave ratio of the target detection point This method only requires one RFID sensor for measurement, reducing the cost required for the measurement process.

[0078] Optionally, acquiring a target power loss value of the RFID antenna link according to the standing wave ratio of the target detection point includes:

[0079] Obtain target parameters, wherein the target parameters include a first value, a second value, a third value, a fourth value, and a fifth value, wherein the first value is a preset value of the number of devices in the RFID antenna link that have standing wave anomalies, the second value is a value of the number of devices in the RFID antenna link, the third value is a value of the number of devices in the indoor distributed system where the RFID antenna is located, the fourth value is a probability value of the devices in the RFID antenna link having standing wave anomalies, and the fifth value is a probability increase value of the devices in the RFID antenna link having standing wave anomalies due to working hours;

[0080] According to the target parameter, correcting the standing wave ratio of the target detection point;

[0081] According to the corrected standing wave ratio of the target detection point, a target power loss value of the RFID antenna link is obtained.

[0082] In the link loss measurement method of the embodiment of the present application, since the standing wave ratio of the target detection point can only generally reflect the system standing wave ratio of the indoor system where the RFID antenna is located, it cannot accurately reflect the standing wave ratio of the link where the RFID antenna is located. If the power loss corresponding to the standing wave ratio of the target detection point is directly used at this time, it may cause the calculated target power loss value to be significantly different from the actual value.

[0083] For example, see Figure 5 and Figure 6 , assuming that the standing wave ratio of antennas A and B is 1.5, and the RFID antenna tag activation power parameters are both 0dBm, the link standing wave ratios of antennas A and B are 1.3 and 5 respectively, and there is an abnormality in the link where antenna B is located, resulting in a relatively high standing wave ratio. Assuming that the critical transmission power of the RFID gateway for antenna A is 10W (40dBm), and the critical transmission power for antenna B is 30W (44.8dBm), that is, without any correction, the insertion loss of antennas A and B is 40 and 44.8dB respectively. The main reason why B has a higher insertion loss than A is that its standing wave ratio is higher.

[0084] The insertion loss of the two-power division is 3.3dB, and the distribution loss is 3dB. For antenna A, the RFID gateway sends a critical transmission power of 40dBm, and its corresponding RFID external tag is activated, that is, antenna A receives an incident power of 0dBm, resulting in the following situation:

[0085] Under the premise that the standing wave ratio of antenna A is 1.5, the actual power at the entrance of antenna A should be 0.177dBm (after the influence of the 1.5 standing wave power transmission of the antenna, it is 0dBm after reaching the antenna, and 0.177dB is the power loss caused by the 1.5 standing wave ratio). Considering that the standing wave ratio of the link where antenna A is located is 1.3 (causing a power loss of 0.075dB), the actual link loss of antenna A is 40-0.075-0.177=39.748dB;

[0086] Under the premise that the standing wave ratio of antenna B is 1.5, the actual power at the entrance of antenna B should be 0.177dBm (after the influence of the 1.5 standing wave power transmission of the antenna, it reaches 0dBm, and 0.177dB is the power loss caused by the 1.5 standing wave ratio). Considering that the standing wave ratio of the link where antenna B is located is 5 (causing a power loss of 2.553dB), the actual link loss of antenna B is 44.8-2.553-0.177=42.08dB;

[0087] The system standing wave ratio can be theoretically calculated based on the standing wave ratio of antennas A and B and the standing wave ratio of their respective links: Assume that the RFID gateway transmits at a power of 10W (40dBm); the incident power at the entrance of antenna A is 0.177dBm (1.04mW), and the reflected power is 1.04*0.04=0.0416mW=-13.8dBm; the incident power at the entrance of antenna B is -2.247dBm (0.596mW), and the reflected power is 0.596*0.04=0.02384mw=-16.23dBm; the receiving power at the RFID gateway is 1.04*0.04=0.02384mw=-16.23dBm. The reflected power is calculated as follows: 2344.2*0.017+2344.2*0.444+4.6*10-6+1.53*10-6 is approximately equal to 1080.69mW; the first two terms of the formula are the incident power of 10W after the loss of two power divisions (3+3.3dB) and the reflected power of 2344.2mW when the links of antennas A and B have standing wave ratios of 1.3 and 5 respectively, while the last two terms of the formula are the reflected power of antennas A and B when their own standing wave ratios are 1.5 and the power transmitted to the RFID gateway after link insertion loss.

[0088] The power reflectivity at the RFID gateway = 1080.69 / 10000 = 10.81%, which leads to a VSWR of about 1.98. The power loss caused by this VSWR is -10*log(1-0.1081) = 0.5dB. The chain losses of antennas A and B corrected with a VSWR of 1.98 are 40-0.5-0 = 39.5dB and 44.8-0.5-0 = 44.3dB, respectively.

[0089] Based on the above situation, the actual link losses of antennas A and B are 39.748dB and 42.08dB respectively. The link losses without any correction are 40dB and 44.8dB respectively. The chain loss correction goes beyond the actual link loss and adjusts it in a smaller direction. The greater the system standing wave ratio is than the standing wave ratio of the link where antenna A is located, the further the corrected chain loss is from the actual chain loss.

[0090] Therefore, it is necessary to correct the standing wave ratio of the target detection point according to the actual situation of the link where the RFID antenna is located. The correction formula is as follows:

[0091]

[0092] Obtain target parameters, which include a first value, a second value, a third value, a fourth value, and a fifth value. According to the correction formula, the first value n ev is the preset value of the number of devices with standing wave anomalies in the RFID antenna link. The preset value of the number of devices with standing wave anomalies is the number of devices in the RFID antenna link that are prone to standing wave anomalies obtained by the measurement personnel based on measurement experience; the second value N is the number of devices in the RFID antenna link, including the RFID antenna itself; the third value S is the number of devices in the room distribution system where the RFID antenna is located, including the RFID antenna itself; the fourth value P is the probability value of the device in the RFID antenna link having standing wave anomalies; the fifth value e j is the probability increase value of the device in the RFID antenna link having standing wave anomaly due to working time, and Y is the working time of the device, and its unit of time is year. These parameters can be set in the RFID gateway. According to the actual situation, such as the historical supply quality of the device manufacturer and the historical construction quality of the construction team, it is recommended to set n ev =3,P=0.1,e j =0.01.

[0093] See also Figure 7In the link loss measurement method of the embodiment of the present application, the RFID gateway first transmits a first signal with a power of T to activate the RFID antenna tag, and then continuously reduces the transmission power of the first signal to obtain a critical transmission power value P1 for activating the RFID antenna tag. The RFID gateway detects the standing wave ratio VSWR through an RFID sensor set in front of the RFID combiner. system Then, the VSWR is corrected according to the actual situation of the RFID link, and the corrected VSWR is used update Get the target power loss value of the RFID antenna link Finally, the link loss Lt=P1-Ls-P0 of the RFID antenna is obtained. This method corrects the standing wave ratio of the target detection point according to the actual situation of the RFID antenna link, reduces the error of the target power loss value of the obtained RFID antenna link, and thus improves the accuracy of the link loss measurement method.

[0094] See also Figure 8 , Figure 8 It is a structural diagram of a link loss measurement device provided in yet another embodiment of the present application.

[0095] like Figure 8 As shown, the link loss measurement device 800 includes:

[0096] A first acquisition module 801 is used to acquire a critical transmission power value for activating an RFID antenna tag, an activation power parameter value of the RFID antenna tag, and a target standing wave ratio of the RFID antenna link;

[0097] A second acquisition module 802 is used to acquire a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link;

[0098] The first determination module 803 is used to determine the link loss of the RFID antenna according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link and the activation power parameter value of the RFID antenna tag.

[0099] Optionally, the second acquisition module includes:

[0100] A first transmitting unit, configured to transmit a first signal to activate the RFID antenna tag;

[0101] The first acquisition unit is used to reduce the transmission power value of the first signal and acquire a critical transmission power value for activating the RFID antenna tag when a response signal from the RFID antenna tag is acquired.

[0102] Optionally, a detection point is provided at a signal input end of each preset device in the RFID antenna link, and the second acquisition module includes:

[0103] A second acquisition unit, used to acquire the standing wave ratio of each detection point in the RFID antenna link;

[0104] A third acquisition unit, configured to acquire a power loss value corresponding to each detection point according to the standing wave ratio of each detection point;

[0105] The first determining unit is used to add the power loss values ​​corresponding to the respective detection points to obtain a target power loss value of the RFID antenna link.

[0106] Optionally, a target detection point is provided at a signal input end of the RFID combiner in the RFID antenna link, and the second acquisition module includes:

[0107] A fourth acquisition unit, configured to acquire a standing wave ratio of the target detection point in the RFID antenna link;

[0108] The fifth acquisition unit is used to acquire the target power loss value of the RFID antenna link according to the standing wave ratio of the target detection point.

[0109] Optionally, the fifth acquiring unit includes:

[0110] A first acquisition subunit is used to acquire a target parameter, wherein the target parameter includes a first value, a second value, a third value, a fourth value, and a fifth value, wherein the first value is a preset value of the number of devices in the RFID antenna link that have standing wave anomalies, the second value is a value of the number of devices in the RFID antenna link, the third value is a value of the number of devices in the indoor distributed system where the RFID antenna is located, the fourth value is a preset probability value of the devices in the RFID antenna link having standing wave anomalies, and the fifth value is a preset probability increase value of the devices in the RFID antenna link having standing wave anomalies due to working time;

[0111] A first correction subunit, used for correcting the standing wave ratio of the target detection point according to the target parameter;

[0112] The first determination subunit is used to obtain a target power loss value of the RFID antenna link according to the corrected standing wave ratio of the target detection point.

[0113] See also Fig. 9 , Fig. 9 is a structural diagram of an electronic device provided by another embodiment of the present application, such as Fig. 9As shown, the electronic device includes: a processor 901 , a communication interface 902 , a communication bus 904 and a memory 903 , wherein the processor 901 , the communication interface 902 and the memory 903 interact with each other via the communication bus 904 .

[0114] Among them, the memory 903 is used to store computer programs; the processor 901 is used to execute the program stored in the memory 903. When the computer program is executed by the processor 901: it is used to obtain the critical transmission power value of the activated RFID antenna tag, the activation power parameter value of the RFID antenna tag and the target standing wave ratio of the RFID antenna link; according to the target standing wave ratio of the RFID antenna link, the target power loss value of the RFID antenna link is obtained; according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link and the activation power parameter value of the RFID antenna tag, the link loss of the RFID antenna is determined.

[0115] Optionally, the processor 901 is specifically configured to:

[0116] Transmitting a first signal to activate the RFID antenna tag;

[0117] When a response signal from the RFID antenna tag is obtained, the transmission power value of the first signal is reduced to obtain a critical transmission power value for activating the RFID antenna tag.

[0118] Optionally, the processor 901 is specifically configured to:

[0119] Obtaining the standing wave ratio of each detection point in the RFID antenna link;

[0120] Obtaining power loss values ​​corresponding to the respective detection points according to the standing wave ratios of the respective detection points;

[0121] The power loss values ​​corresponding to the various detection points are added together to obtain a target power loss value of the RFID antenna link.

[0122] Optionally, the processor 901 is specifically configured to:

[0123] Obtaining the standing wave ratio of the target detection point in the RFID antenna link;

[0124] According to the standing wave ratio of the target detection point, a target power loss value of the RFID antenna link is obtained.

[0125] Optionally, the processor 901 is specifically configured to:

[0126] Obtain target parameters, wherein the target parameters include a first value, a second value, a third value, a fourth value, and a fifth value, wherein the first value is a preset value of the number of devices in the RFID antenna link that have standing wave anomalies, the second value is a value of the number of devices in the RFID antenna link, the third value is a value of the number of devices in the indoor distributed system where the RFID antenna is located, the fourth value is a preset probability value of the devices in the RFID antenna link having standing wave anomalies, and the fifth value is a preset probability increase value of the devices in the RFID antenna link having standing wave anomalies due to working time;

[0127] According to the target parameter, correcting the standing wave ratio of the target detection point;

[0128] According to the corrected standing wave ratio of the target detection point, a target power loss value of the RFID antenna link is obtained.

[0129] The communication bus 904 mentioned in the above electronic device can be a peripheral component interconnect (PCT) bus or an extended industry standard architecture (EISA) bus, etc. The communication bus 904 can be divided into an address bus, a data bus, a control bus, etc. For ease of identification, only one thick line is used in the figure, but it does not mean that there is only one bus or one data type.

[0130] The communication interface 902 is used for communication between the above terminal and other devices.

[0131] The memory 903 may include a random access memory (RAM) or a non-volatile memory (non-volatile memory), such as at least one disk storage. Optionally, the memory 903 may also be at least one storage device located away from the aforementioned processor 901. The aforementioned processor 901 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0132] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the link loss measurement method embodiment described above is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0133] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0134] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0135] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A link loss measurement method, characterized in that: The method comprises: Obtaining a critical transmission power value for activating an RFID antenna tag, an activation power parameter value of the RFID antenna tag, and a target standing wave ratio of the RFID antenna link; According to the target standing wave ratio of the RFID antenna link, obtaining a target power loss value of the RFID antenna link; Determining the link loss of the RFID antenna according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link, and the activation power parameter value of the RFID antenna tag; A target detection point is provided at a signal input end of the RFID combiner in the RFID antenna link, and obtaining a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link includes: Obtaining the standing wave ratio of the target detection point in the RFID antenna link; According to the standing wave ratio of the target detection point, a target power loss value of the RFID antenna link is obtained; The step of obtaining a target power loss value of the RFID antenna link according to the standing wave ratio of the target detection point includes: Obtain target parameters, wherein the target parameters include a first value, a second value, a third value, a fourth value, and a fifth value, wherein the first value is a preset value of the number of devices in the RFID antenna link that have standing wave anomalies, the second value is a value of the number of devices in the RFID antenna link, the third value is a value of the number of devices in the indoor distributed system where the RFID antenna is located, the fourth value is a probability value of the devices in the RFID antenna link having standing wave anomalies, and the fifth value is a probability increase value of the devices in the RFID antenna link having standing wave anomalies due to working hours; According to the target parameter, correcting the standing wave ratio of the target detection point; Obtaining a target power loss value of the RFID antenna link according to the corrected standing wave ratio of the target detection point; The standing wave ratio of the target detection point is corrected based on the following formula: Among them, n ev represents the first value, N represents the second value, S represents the third value, P represents the fourth value, e j represents the fifth value, Y represents the working time of the device, and the unit of the time is year, and VSWR system It represents the standing wave ratio, VSWR, detected by the RFID sensor set before the RFID combiner. update Indicates the corrected standing wave ratio of the target detection point.

2. The link loss measurement method according to claim 1, characterized in that: The step of obtaining a critical transmission power value for activating the RFID antenna tag includes: Transmitting a first signal to activate the RFID antenna tag; When a response signal from the RFID antenna tag is obtained, the transmission power value of the first signal is reduced to obtain a critical transmission power value for activating the RFID antenna tag.

3. The link loss measurement method according to claim 1, characterized in that: A detection point is provided at a signal input end of each preset device in the RFID antenna link, and obtaining a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link comprises: Obtaining the standing wave ratio of each detection point in the RFID antenna link; Obtaining power loss values ​​corresponding to the respective detection points according to the standing wave ratios of the respective detection points; The power loss values ​​corresponding to the various detection points are added together to obtain a target power loss value of the RFID antenna link.

4. A link loss measurement device, characterized in that: The device comprises: A first acquisition module is used to acquire a critical transmission power value for activating an RFID antenna tag, an activation power parameter value of the RFID antenna tag, and a target standing wave ratio of the RFID antenna link; A second acquisition module, configured to acquire a target power loss value of the RFID antenna link according to a target standing wave ratio of the RFID antenna link; A first determination module, configured to determine the link loss of the RFID antenna according to the critical transmission power value of the activated RFID antenna tag, the target power loss value of the RFID antenna link, and the activation power parameter value of the RFID antenna tag; A target detection point is provided at a signal input end of the RFID combiner in the RFID antenna link, and the second acquisition module includes: A fourth acquisition unit, configured to acquire a standing wave ratio of the target detection point in the RFID antenna link; A fifth acquisition unit, configured to acquire a target power loss value of the RFID antenna link according to the standing wave ratio of the target detection point; The fifth acquisition unit includes: A first acquisition subunit is used to acquire a target parameter, wherein the target parameter includes a first value, a second value, a third value, a fourth value, and a fifth value, wherein the first value is a preset value of the number of devices in the RFID antenna link that have standing wave anomalies, the second value is a value of the number of devices in the RFID antenna link, the third value is a value of the number of devices in the indoor distributed system where the RFID antenna is located, the fourth value is a preset probability value of the devices in the RFID antenna link having standing wave anomalies, and the fifth value is a preset probability increase value of the devices in the RFID antenna link having standing wave anomalies due to working time; A first correction subunit, used for correcting the standing wave ratio of the target detection point according to the target parameter; A first determining subunit, configured to obtain a target power loss value of the RFID antenna link according to the corrected standing wave ratio of the target detection point; The standing wave ratio of the target detection point is corrected based on the following formula: Among them, n ev represents the first value, N represents the second value, S represents the third value, P represents the fourth value, e j represents the fifth value, Y represents the working time of the device, and the unit of the time is year, and VSWR system It represents the standing wave ratio, VSWR, detected by the RFID sensor set before the RFID combiner. update Indicates the corrected standing wave ratio of the target detection point.

5. The link loss measurement device according to claim 4, characterized in that: The second acquisition module includes: A first transmitting unit, configured to transmit a first signal to activate the RFID antenna tag; The first acquisition unit is used to reduce the transmission power value of the first signal and acquire a critical transmission power value for activating the RFID antenna tag when a response signal from the RFID antenna tag is acquired.

6. The link loss measurement device according to claim 4, characterized in that: The signal input end of each preset device in the RFID antenna link is provided with a detection point, and the second acquisition module comprises: A second acquisition unit, used to acquire the standing wave ratio of each detection point in the RFID antenna link; A third acquisition unit, configured to acquire a power loss value corresponding to each detection point according to the standing wave ratio of each detection point; The first determining unit is used to add the power loss values ​​corresponding to the respective detection points to obtain a target power loss value of the RFID antenna link.

7. An electronic equipment device, characterized in that: The invention comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the computer program implements the steps of the link loss measurement method according to any one of claims 1 to 3 when executed by the processor.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the link loss measurement method according to any one of claims 1 to 3 are implemented.

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