Antenna Testing Method, Storage Medium and System for Internet of Things System

Abstract

The present invention discloses an antenna testing method, a storage medium and a system for an Internet of Things system. The method includes: placing the device under test A at the center of the turntable in a multi-probe anechoic chamber, and placing the device under test B for auxiliary testing in the test bracket of a shielding box; controlling the central turntable to a preset first Phi angle, and controlling the antenna switching switch to a preset first Theta angle; controlling the connection mode of the first link switching switch to achieve a connection in a second state; controlling wireless information interaction between the device under test A and the device under test B, and controlling the connection mode of the second link switching switch to a connection state in a first state; setting the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device under test B, and being in a state of measuring power values. The present invention controls the Phi angle of the central turntable and the Theta angle of the antenna switching switch, realizes the measurement of the power value state, and finally realizes the measurement of antenna performance such as equivalent radiated power.

Description

Technical Field

[0001] The present invention relates to the field of active testing of antennas in an Internet of Things (IoT) communication system, and particularly to an antenna testing method, a storage medium, and a system for an IoT system. Background Art

[0002] For the performance testing of traditional IoT device wireless communication systems, taking the 2G, 3G, 4G, and current 5G systems in mainstream mobile communications as examples, there are relatively complete testing methods and related standards for the antenna performance testing of these communication systems. The international CTIA standard and the YD / T 1484 series standards in China have relatively complete and systematic definitions for the testing methods and standards of wireless terminal antenna performance. For these tests, there are mature instrument and equipment supplies and complete solutions, and the active performance testing of antennas can be easily achieved. By using standardized detection instruments to evaluate the performance of communication terminal antennas and base station antennas respectively, the performance status of the entire communication system can be obtained.

[0003] With the development of the IoT industry, more and more IoT communication technologies are applied in all aspects of life. Among them, since the application of some technologies is still in the initial stage, it is difficult to find economically applicable detection equipment for radio frequency-related performance on the market. Even for some communication protocols with private protocols, no detection equipment can provide the detection capabilities such as acting as an analog base station or providing modulation and demodulation during the active performance testing of antennas. To address this problem, most current developers and designers of such IoT products adopt application-layer performance testing, such as actual communication distance testing or throughput testing, or adopt auxiliary testing means such as testing the passive antenna efficiency gain performance of the antennas of communication devices. In addition, there are some prior arts that use an anechoic chamber to test the antenna performance of communication devices, but their methods can only qualitatively evaluate the antenna performance, and cannot quantitatively obtain the radiation power and radiation sensitivity performance of the object under test. Moreover, the communication distance between the communication systems under test cannot be accurately obtained, and only a relative communication distance performance based on the test device can be obtained.

[0004] Facing the complex and diverse IoT communication technologies, the prior art cannot provide economically adaptable instrument modulation and demodulation for active testing of antenna performance. It is difficult for IoT product developers and designers to afford high equipment costs, and it is also impossible for testing laboratories to purchase equipment for each communication protocol.

[0005] Some existing technologies require connecting to an internal radio frequency communication interface, which means that some terminals need to be disassembled to connect to the internal antenna interface. For the passive performance of the antenna or the communication distance, it is necessary to disassemble the originally connected antenna of the device and connect a test antenna or a test cable for testing. These testing methods all require disassembling the machine and even damaging it, which is not allowed in some situations.

[0006] The existing technologies cannot provide complete and specific performance data of the communication system to be tested. Only a qualitative determination of the antenna performance relative to the test system can be obtained, and quantitative determination is impossible. Also, the active performance of the antenna cannot be quantitatively determined, and specific data of the active EIS and EIRP performance parameters of the antenna cannot be obtained.

[0007] Furthermore, in actual engineering applications, in some special application scenarios, many Internet of Things devices to be tested cannot provide underlying software support. For example, software for reading the received signal strength indicator (RSSI) cannot be provided, or software that can read the communication transceiver data cannot be provided. Therefore, if the RSSI value needs to be read or the success rate of receiving signals needs to be read during testing, the corresponding software support cannot be obtained. There is a situation where the existing testing methods are limited by the lack of software support. Summary of the Invention

[0008] Therefore, it is necessary to provide an antenna testing method, a storage medium, and a system for the Internet of Things system to solve the problem that the existing technologies cannot conveniently test the antenna performance of the Internet of Things system.

[0009] To achieve the above object, the present invention provides an antenna testing method for the Internet of Things system, including the following steps:

[0010] Place the device A to be tested at the center of the turntable in the multi-probe anechoic chamber, and place the device B to be tested for auxiliary testing in the test bracket of the shielding box;

[0011] Control the center turntable to a preset first Phi angle, and control the antenna switching switch to a preset first Theta angle; control the connection mode of the first link switching switch to achieve the connection of the second state;

[0012] Control the wireless information interaction between the device A to be tested and the device B to be tested, and control the connection mode of the second link switching switch to the connection state of the first state; set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device B to be tested, and be in the state of measuring the power value;

[0013] Calculate the power value radiated by the communication antenna based on the power value collected by the signal measuring instrument and the link insertion loss, and adjust the loss value of the first link signal control device according to the power value measured by the instrument to ensure that the device A to be tested has sufficient received signal strength;

[0014] Control the DUT A to radiate signals continuously at the maximum power, and control the connection mode of the second link switching switch to the second state; set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the DUT A, and record the measured power value as Power_eirp;

[0015] Calculate the radiation power value of the coupling board according to the power value Power_eirp and the link insertion loss, and adjust the loss value of the second link signal control device according to the power value measured by the instrument to ensure that the DUT B has sufficient received signal strength;

[0016] Calculate the equivalent radiated power EIRP at this angle (theta，phi) value, the formula is as follows:

[0017] EIRP (theta，phi) = Power_eirp + S 21 (OTA, f) + S 21 (tx, f)

[0018] In the formula: EIRP (theta，phi) is the equivalent radiated power value at the (theta, phi) angle; Power_eirp is the power value measured by the signal measuring instrument; S 21 (OTA, f) is the total value of the space loss between the current angle detection antenna in the anechoic chamber and the DUT A, as well as the antenna switching switch and related line losses; S 21 (tx, f) is the total value of other losses in the link, mainly including the total value of the switching switch, fixed attenuator, combiner, switching switch and related line losses;

[0019] Control the antenna switching switch to the preset second Theta angle, repeat the measurement steps, and complete the EIRP measurement at the second Theta angle;

[0020] Control the central turntable to rotate to the preset second Phi angle, repeat the above test at the Theta angle, and complete the EIRP measurement at all Phi and Theta angles.

[0021] Further, it also includes the step of setting the adjustable attenuator and amplifier in the first link signal control device and the second link signal control device to a preset initial value.

[0022] Further, when placing the DUT A at the center of the turntable in the multi-probe anechoic chamber, it also includes the step of calibrating and confirming each part of the path, including calibrating the air path loss of the path between the test antenna in the anechoic chamber and the center of the test turntable, and the losses of each part in the link.

[0023] Further, it also includes the equivalent isotropic radiated sensitivity EIS measurement step:

[0024] Control the wireless information interaction between the device under test A and the device under test B, and lock the connection state of the second link switching switch to the first state; set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device under test B, and read the power value Power_eis of the signal measuring instrument at this time; calculate the power value radiated by the detection antenna according to this power value and the link insertion loss, and adjust the loss value of the first link signal control device according to the power value measured by the instrument to ensure that the device under test A has sufficient received signal strength;

[0025] Increase the loss value of the first link signal control device according to the preset step value to reduce the power value radiated by the detection antenna, and judge whether the communication performance between the device under test A and the device under test B meets the preset worst-case requirements; if the preset requirements are met, further increase the loss value of the first link signal control device until the preset requirements are reached; record the Power_eis and the loss value S of the first link signal control device at this time 21 (610, f);

[0026] Calculate the EIS of this angle (theta，phi) value, the formula is as follows:

[0027] EIS (theta，phi) = Power_eis - S 21 (OTA, f) - S 21 (610, f) - S 21 (rx, f)

[0028] In the formula: EIS (theta，phi) is the equivalent radiation sensitivity value of the (theta, phi) angle; Power_eis is the power value measured by the current signal measuring instrument; S 21 (OTA, f) is the total space loss value and line loss value between the detection antenna and the device under test A at the current angle in the anechoic chamber; S 21 (610, f) is the loss value of the link signal control device, including the total loss value of the isolator, tunable amplifier, and tunable attenuator inside it; S 21 (rx, f) is the total value of other loss calibrations in the link, mainly including the total loss value of the second link switching switch, fixed attenuator, combiner, first link switching switch, and related lines;

[0029] Control the antenna switching switch to the preset second Theta angle, repeat the above EIS measurement steps, and complete the EIS measurement of the second Theta angle;

[0030] Control the switching center turntable to rotate to the Phi angle as the second angle, repeat the above EIS measurement steps, and complete the EIS measurement of all Phi and Theta angles.

[0031] Further, it also includes the steps:

[0032] Complete the EIRP and EIS measurements of the device under test A at various angles based on the device under test B respectively, and record them as EIRP DUT_ A, EIS DUT_A ;

[0033] Exchange the placement positions of the device under test A and the device under test B, repeat the above EIRP and EIS measurement steps, and record the differences in EIRP and EIS at various angles of the device under test B based on the device under test A as EIRP DUT_B , EIS DUT_B ;

[0034] Calculate the communication distance between the two devices without obstruction according to the following formula:

[0035]

[0036]

[0037] In the formula: R (A-B) is the transmission distance for the device under test A to transmit a signal and the device under test B to receive the signal, and R (B-A) is the transmission distance for the device under test B to transmit a signal and the device under test A to receive the signal; EIRP DUT_A(theta1，phi1) and EIS DUT_A(theta1，phi1) are the equivalent radiated power and equivalent radiated sensitivity of the device under test in the direction of the angle (theta1, phi1) respectively, and EIRP DUT_B(theta2，phi2) and EIS DUT_B(theta2，phi2) are the equivalent radiated power and equivalent radiated sensitivity of the device under test in the direction of the angle (theta2, phi2) respectively; f is the communication frequency; theta1 is the preset first Theta angle; theta2 is the preset second Theta angle; phi1 is the preset first Phi angle; phi2 is the preset second Phi angle;

[0038] The communication distance between the two communication devices takes the minimum value: R = min(R (A-B) , R (B-A) ).

[0039] Further, the step of determining whether the communication performance between the device under test A and the device under test B meets the requirements of the preset worst-case scenario includes the steps:

[0040] Connect the switching switch in the second state so that the signal measuring instrument is connected to the communication antenna of the anechoic chamber. Set the reading mode of the signal measuring instrument to the time-domain scanning mode. During the test, the communication antenna first receives the electromagnetic signal radiated by the detection antenna, and then receives the electromagnetic signal radiated by the device under test A to form a complete signal communication process. Pre-record a normal and complete waveform under normal communication conditions, including the time interval information, waveform amplitude information, and waveform width information of the waveform. The normal and complete waveform is a waveform that includes all successfully completed information interactions and can represent successful communication. During the EIS measurement, read the waveform situation during the interaction process through the signal measuring instrument, and compare it with all the recorded normal waveforms in turn to determine whether the communication is successful.

[0041] Further, the step of determining whether the communication performance between the device under test A and the device under test B meets the preset worst-case requirements includes: sending specific information from the device under test A to the device under test B, and presetting that the device under test B will return the original information to the device under test A after receiving the information; after the device under test A receives the returned information, compare it with the sent information to determine whether the device under test B has successfully received it.

[0042] Further, the step of determining whether the communication performance between the device under test A and the device under test B meets the preset worst-case requirements includes: sending specific information from the device under test A to the device under test B, reading the received information from the device under test B through wired or wireless information interaction, and comparing it with the sent information for judgment.

[0043] The present invention also provides a storage medium storing a computer program, and when the computer program is executed by a processor, it implements the steps of the method according to any one of the embodiments of the present invention.

[0044] The present invention also provides a test system, including a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, it implements the steps of the method according to any one of the embodiments of the present invention.

[0045] Different from the prior art, the above technical solution controls the Phi angle of the control center turntable and the Theta angle of the control antenna switch; then, by controlling the wireless information interaction between the device under test A and the device under test B, the measurement of the power value state is realized, and finally the measurement of the equivalent radiated power is realized. And the Phi angle and Theta angle can be changed to realize the measurement of the equivalent radiated power at multiple angles. In a further embodiment, the test of the equivalent radiation sensitivity and communication distance can also be completed, so as to realize the comprehensive test of the antenna performance. Description of the Drawings

[0046] Figure 1Flow chart of the test method of the present invention;

[0047] Figure 2 Structural schematic diagram of the signal test device of the present invention;

[0048] Figure 3 Structural schematic diagram of the signal adjustment device of the present invention;

[0049] Figure 4 Structural schematic diagram of the link signal control device of the present invention;

[0050] Figure 5 Interaction schematic diagram of the feedback method;

[0051] Figure 6 Schematic diagram of the waveform collected by the signal measuring instrument;

[0052] Figure 7 Schematic diagram for judging whether the communication between the communication device A to be tested and the device B to be tested is normal.

[0053] Explanation of reference numerals:

[0054] 1. Multi-probe anechoic chamber;

[0055] 101. Central turntable;

[0056] 102. Antenna switch;

[0057] 112. Detection antenna;

[0058] 111. Communication antenna;

[0059] 2. Shielding box;

[0060] 202. Test bracket;

[0061] 201. Signal coupling board;

[0062] 3. First link switch;

[0063] 4. Control and test system;

[0064] 5. Signal measuring instrument;

[0065] 6. Signal adjustment device;

[0066] 601. First fixed attenuator; 602. Second fixed attenuator; 603. Third fixed attenuator; 604. Fourth fixed attenuator; 605. Fifth fixed attenuator; 606. Sixth fixed attenuator;

[0067] 607. Load;

[0068] 610. First link signal control device; 620. Second link signal control device;

[0069] 631. First combiner; 632. Second combiner; 633. Third combiner;

[0070] 641. Second link switching switch;

[0071] 611. First isolator; 612. Adjustable signal amplifier; 613. Adjustable attenuator; 614. Second isolator; 615. Switch. Detailed implementation manners

[0072] To describe in detail the technical content, structural features, achieved objectives and effects of the technical solution, the following is a detailed description in conjunction with specific embodiments and with reference to the accompanying drawings.

[0073] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The term "embodiment" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0074] Unless otherwise defined, the meanings of the technical terms used herein are the same as those generally understood by those skilled in the technical field to which the present application belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present application.

[0075] In the description of the present application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this article generally represents an "or" logical relationship between the associated objects.

[0076] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary-secondary or order relationship between these entities or operations.

[0077] Without further limitation, in this application, the terms "comprising", "including", "having" or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude that there may be additional elements in a process, method or product including the recited elements, so that a process, method or product including a series of elements may include not only those defined elements, but also other elements not expressly listed, or elements inherent to such process, method or product.

[0078] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding" are understood not to include the recited number; expressions such as "above", "below", "within" are understood to include the recited number. In addition, in the description of the embodiments of this application, the meaning of "a plurality of" is two or more (including two), and similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in this way, unless otherwise specifically limited.

[0079] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawings. It is only for the convenience of describing the specific embodiments of this application or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of this application.

[0080] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, the terms "installed", "connected", "coupled", "fixed", "set", etc. shall be understood in a broad sense. For example, the "connection" may be a fixed connection, a detachable connection, or an integral setting; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium; it may be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which this application pertains, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0081] Please refer to Figures 1 to 7, the present invention provides an antenna testing method for an Internet of Things (IoT) system, which can be used for quantitatively detecting the performance of antennas in an IoT communication system. This method and the corresponding device are economical and applicable. Facing a large number of different IoT communication technology standards, it is possible to quantitatively measure the active performance of the communication device antenna, such as EIS and EIRP, without disassembling the device antenna. Moreover, the complete and accurate performance status of the receiving and transmitting devices of the communication system to be tested can be obtained through testing. At the same time, in the case where software support for reading RSSI values and signal reading success rates cannot be obtained, a method for determining whether a signal is successfully read is provided.

[0082] As Figure 1 shown, the method of the present invention includes the following steps: Step S101: Place the device A to be tested at the center of the turntable in a multi-probe anechoic chamber, and place the device B to be tested for auxiliary testing in the test bracket of the shielding box; Step S102: Control the central turntable to a preset first Phi angle, and control the antenna switching switch to a preset first Theta angle; Control the connection mode of the first link switching switch to achieve the connection of the second state; Step S103: Control the wireless information interaction between the device A to be tested and the device B to be tested, and control the connection mode of the second link switching switch to the connection state of the first state; Set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device B to be tested, and be in the state of measuring the power value; Step S104: Calculate the power value radiated by the communication antenna according to the power value collected by the signal measuring instrument and the link insertion loss, and adjust the loss value of the first link signal control device according to the power value measured by the instrument to ensure that the device A to be tested has sufficient received signal strength; Step S105: Control the device A to be tested to continuously radiate signals at the maximum power, and control the connection mode of the second link switching switch to the connection state of the second state; Set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device A to be tested, and record the measured power value as Power_eirp; Step S106: Calculate the radiated power value of the coupling board according to the power value Power_eirp and the link insertion loss, and adjust the loss value of the second link signal control device according to the power value measured by the instrument to ensure that the device B to be tested has sufficient received signal strength; Step S107: Calculate the equivalent isotropically radiated power EIRP (theta，phi) value, and the formula is as follows:

[0083] EIRP (theta，phi) = Power_eirp + S 21 (OTA, f) + S 21 (tx, f)

[0084] In the formula: EIRP (theta，phi is the equivalent isotropically radiated power value at the (theta, phi) angle; Power_eirp is the power value measured by the signal measuring instrument; S 21(OTA, f) is the total space loss value between the current angle detection antenna and the device under test A in the anechoic chamber, as well as the total loss of the antenna switch and related circuits; S 21 (tx, f) is the total loss of other components in the link, mainly including the switch, fixed attenuator, combiner, the total loss of the switch and related circuits; Step S108 controls the antenna switch to a preset second Theta angle, and repeats the measurement step to complete the EIRP measurement of the second Theta angle; Step S109 controls the central turntable to rotate to a preset second Phi angle, and repeats the above test of the Theta angle to complete the EIRP measurement of all Phi and Theta angles.

[0085] The method of the present invention can be applied to a test device such as Figure 2 shown. As Figure 2 shown, a test device based on a multi-probe anechoic chamber system includes a multi-probe anechoic chamber 1 for measuring the receive performance EIS and the radiation power performance EIRP of the communication system under test; the multi-probe anechoic chamber includes a circle of detection antennas 112, and the number of detection antennas is N, where N can be an integer greater than or equal to 5. The multi-probe anechoic chamber 1 also includes a communication antenna 111 for signal connection, which is a small multi-band antenna placed inside the central turntable near the test center in the area where the device under test is placed, and is connected to external signals through a radio frequency cable through the waveguide port of the anechoic chamber. The multi-probe anechoic chamber 1 also includes a central turntable 101 for placing the device under test; and the device under test A placed on the central turntable; the multi-probe anechoic chamber 1 includes an antenna switch 102 for detecting antenna selection, one end of which is connected to the detection antenna, and the other end is connected to the external signal of the anechoic chamber through the waveguide port.

[0086] The test device based on the multi-probe anechoic chamber system also includes a shielding box 2, which is placed outside the multi-probe anechoic chamber, and inside there is a test bracket 202 for placing a fixed device under test (device under test) and a signal coupling board 201. The test bracket preferably uses an electromagnetic transparent material, which can reduce the signal influence on the antenna performance of the device under test B. The signal coupling board 201 is electrically connected to the outside of the shielding box through a radio frequency cable.

[0087] The test device based on the multi-probe anechoic chamber system includes a first link switch 3, which is placed outside the multi-probe anechoic chamber 1. It includes four ports a, a’, b, b’, and can be controlled to be connected in the first state a-a’, b-b’; or can also be controlled to achieve the connection in the second state a-b’, b-a’.

[0088] The test device based on the multi-probe anechoic chamber system includes a signal adjustment device 6, which realizes signal selection and switching and regulates the magnitude of the path signal, ensuring stable and accurate test connections. It has 4 ports, namely port A, port B, port C, and port D. Among them, port A is connected to the signal coupling board 201 of the shielding box 2, port B is connected to port a' of the first link switching switch 3; port C is connected to port b' of the first link switching switch 3; port D is connected to the signal measuring instrument 5.

[0089] The test device based on the multi-probe anechoic chamber system includes a signal measuring instrument 5, which can measure the signal power value during the test. The signal measuring instrument 5 can also support time-domain signal measurement for judging whether the communication connection is normal. The signal measuring instrument can be a spectrum analyzer or an oscilloscope.

[0090] The test device based on the multi-probe anechoic chamber system includes a control and test system 4, which is connected to the multi-probe anechoic chamber 1, the first link switching switch 3, the signal adjustment device 6, and the signal measuring instrument 5 through control cables. It can control the device, obtain information, and calculate the test results.

[0091] Such as Figure 3As shown, the signal adjustment device 6 includes a first fixed attenuator 601, a second fixed attenuator 602, a third fixed attenuator 603, a fourth fixed attenuator 604, a fifth fixed attenuator 605 and a sixth fixed attenuator 606; the signal adjustment device 6 also includes a first combiner 631, a second combiner 632 and a third combiner 633; ​​the signal adjustment device 6 also includes a load 607; the signal adjustment device 6 also includes a second link switch 641; and includes a first link signal control device 610 and a second link signal control device 620. The first fixed attenuator 601, the second fixed attenuator 602 and the third fixed attenuator 603 are respectively connected to the three ports of the first combiner 631. Here, in order to distinguish, the three ports are named as a signal end, another signal end and a common end. The two signal ends can be connected to the signal line respectively, and then the common end can realize the combined output of two signals. The combiner is a unit composed of multiple filters, and all ports of the multi-port network are input / output dual-function ports, which can realize the merging or separation of wireless signals and then output. The fixed attenuator in the present invention mainly provides fixed attenuation of the line and ensures load matching of the first combiner 631 port, thereby preventing different terminals B under test from causing impedance changes of the signal coupling board in the shielding box, causing signal reflection and affecting the test results. The first combiner 631 divides the signal path of the signal coupling board 201 into two paths, one of which is connected to the second combiner 632 as a signal output through the third fixed attenuator 603; the other is connected to the output end of the second link signal control device 620 through the second fixed attenuator 602; the second combiner 632 divides the signal into two paths, one of which is connected to the input end of the first link signal control device 610 through the fourth fixed attenuator 604, and the other is connected to the second link switching switch 641 through the fifth fixed attenuator 605, so as to realize the measurement of the signal size of the signal coupling board 201; the third combiner 633 is connected to the first link switching switch 3 through the D port, so as to divide the signal of the anechoic chamber into two paths, one of which is connected to the link switching switch 641 through the sixth fixed attenuator 606 to realize the measurement of the signal size of the antenna in the anechoic chamber, and the other is connected to the input end of the second link signal control device 620 to realize the signal path between the antenna in the anechoic chamber and the shielding box.

[0092] In addition, the load 607 is connected to the port b' of the second link switch 641, so as to realize the load connection of the second combiner 632 or the third combiner 633 signal when the signal measuring instrument 5 is not connected, thereby ensuring the matching of the signal path and preventing signal reflection from affecting the test result.

[0093] The first link signal control device 610 and the second link signal control device 620 have the same structure and are used for unidirectional transmission of link signals and signal magnitude adjustment. They include two ports, namely a signal input port (IN port) and a signal output port (OUT port). As Figure 4 shown, a first isolator 611, an adjustable signal amplifier 612, an adjustable attenuator 613, and a second isolator 614 are connected in series between the two ports respectively. And a switch 615 for short-circuiting the signal is connected in parallel at the adjustable signal amplifier 612, which is used to short-circuit the adjustable signal amplifier 612 to reduce the active noise brought by the amplifier 612 when the signal strength meets the requirements.

[0094] It should be noted that the control and test system 4 can be directly connected to each module and unit in the signal adjustment device 6 to achieve control. Or it can achieve transfer control through an intermediate control component 650, that is, the control and test system 4 sends a signal to the intermediate control component 650, and the intermediate control component 650 responds to the signal and realizes the control of each module and unit in the signal adjustment device 6.

[0095] The following will be described in combination with the device and method. Based on the device, the method for measuring the equivalent isotropically radiated power (EIRP) of an Internet of Things communication device includes the following steps:

[0096] 1. Before the test, calibrate and confirm each part of the path, including the air path loss of the path between the test antenna and the center of the test turntable in the anechoic chamber, including the losses of each part in the link. Among them, the link loss values of each part in the signal adjustment device 6 are calibrated. Since the two paths of the combiner have the characteristics of equal amplitude and equal phase, for the sake of simplicity in explaining this embodiment, it is assumed that its performance is in an ideal state. In actual engineering applications, the loss values of the two ports of each combiner need to be calibrated separately. The specific calibration method can adopt the existing calibration method, which will not be elaborated here.

[0097] 2. Place the device under test A at the center of the turntable of the multi-probe anechoic chamber 1, and place the device under test B for auxiliary test in the test bracket 202 of the shielding box 2, and keep the relative position unchanged with respect to the signal coupling board 201.

[0098] 3. Control the central turntable 101 to be at the first Phi angle, and control the antenna switch 102 to be at the first angle of Theta; control the connection mode of the first link switch 3 to achieve the connections of a-b’ and b-a’; set the adjustable attenuator 613 and the amplifier 612 in the first link signal control device 610 and the second link signal control device 620 to an initial value to ensure a relatively ideal initial value for the communication link loss;

[0099] 4. Control the wireless information interaction between the device under test A and the device under test B, and control the connection mode of the second link switching switch 641 to the connection states of a-a' and b-b'. In the current states of the first link switching switch 3 and the second link switching switch 641, at this time, the communication antenna 111 is connected to a signal terminal of the second combiner 632, and then connected to the signal coupling board 201 through the second combiner 632. The signal measuring instrument 5 is connected to the other signal terminal of the second combiner 632, and the signal of the detection antenna can enter the signal measuring instrument 5 through the third combiner 633. Set the acquisition frequency of the signal measuring instrument 5 to be the same as the output signal frequency of the device under test B, and measure the power value. According to this power value and the link insertion loss, the power value radiated by the communication antenna 111 can be calculated. Adjust the loss value of the first link signal control device 610 according to the power value measured by the instrument to ensure that the device under test A has sufficient received signal strength and ensure the stability of the link during the test.

[0100] 5. Control the device under test A to continuously radiate signals at the maximum power, and control the connection mode of the second link switching switch 641 to the connection states of a-b' and b-a'. In the current states of the first link switching switch 3 and the second link switching switch 641, at this time, the communication antenna 111 is connected to a signal terminal of the second combiner 632, and then connected to the signal coupling board 201 through the second combiner 632. The signal measuring instrument 5 is connected to a signal terminal of the third combiner 633, and the signal of the detection antenna 112 can enter the signal measuring instrument 5 through the third combiner 633. Set the acquisition frequency of the signal measuring instrument 5 to be the same as the output signal frequency of the device under test A, and measure the power value and record it as Power_eirp. According to this power value and the link insertion loss, the radiated power value of the signal coupling board 201 can be calculated. Adjust the loss value of the second link signal control device 620 according to the power value measured by the instrument to ensure that the device under test B has sufficient received signal strength and ensure the stability of the link during the test.

[0101] 6. Calculate the EIRP value at this angle (theta，phi) The formula is as follows:

[0102] EIRP (theta，phi) = Power_eirp + S 21 (OTA, f) + S 21 (tx, f)

[0103] In the formula: EIRP (theta，phi) -- The equivalent radiated power value at the angle (theta, phi) (unit: dBm); Power_eirp is the power value measured by the current signal measuring instrument 5 (unit: dBm); S 21(OTA, f) is the total value of the space loss between the current angle detection antenna 112 and the device under test A in the anechoic chamber and the loss of the switching switch and related circuits (unit: dB); S 21 (tx, f) is the total value of other losses in the link, mainly including the second link switching switch 641, the fixed attenuator 606, the third combiner 633, the first link switching switch 3 and the total loss of related circuits (unit: dB).

[0104] 7. Control the antenna switching switch 102 to be at a second angle of Theta, which is different from the first Theta angle. Repeat steps 4 to 7 to complete the EIRP measurement for all second angles of Theta. Of course, the Theta angle here can also have a third angle, a fourth angle, or more angles.

[0105] 8. Control the switching center turntable 101 to rotate to a second angle of Phi, which is different from the first Phi angle. Repeat steps 4 to 8 to complete the EIRP measurement for all Phi and theta angles. That is, complete the measurement of all Theta angles at each Phi angle. Then, the EIRP at each angle can be calculated. (theta，phi) , and finally record and save the EIRP data for all angles.

[0106] In the above embodiment, by controlling the Phi angle of the center turntable and the Theta angle of the antenna switching switch; then, by controlling the wireless information interaction between the device under test A and the device under test B, the measurement of the power value state is realized, and finally the measurement of the equivalent radiated power is realized. And the Phi angle and the Theta angle can be changed to realize the measurement of the equivalent radiated power at multiple angles.

[0107] Further, it also includes the equivalent radiated sensitivity EIS measurement step: control the wireless information interaction between the device under test A and the device under test B, and control the connection mode of the second link switching switch to be locked in the first state; set the acquisition frequency of the signal measurement instrument to be the same as the output signal frequency of the device under test B, and read the power value Power_eis of the signal measurement instrument at this time; calculate the power value radiated by the detection antenna according to this power value and the link insertion loss, and adjust the loss value of the first link signal control device according to the power value measured by the instrument to ensure that the device under test A has sufficient received signal strength.

[0108] Increase the loss value of the first link signal control device according to the preset step value to reduce the power value radiated by the detection antenna, and determine whether the communication performance between the device under test A and the device under test B meets the preset worst-case requirements; if the preset requirements are met, further increase the loss value of the first link signal control device until the preset requirements are reached; record the Power_eis and the loss value S of the first link signal control device at this time 21 (610, f);

[0109] Calculate the EIS of this angle (theta，phi value, the formula is as follows:

[0110] EIS (theta，phi = Power_eis - S 21 (OTA, f) - S 21 (610, f) - S 21 (rx, f)

[0111] In the formula: EIS (theta，phi) is the equivalent radiation sensitivity value at the (theta, phi) angle; Power_eis is the power value measured by the current signal measuring instrument; S 21 (OTA, f) is the total space loss value and line loss value between the current angle detection antenna and the device under test A in the anechoic chamber; S 21 (610, f) is the loss value of the link signal control device, including the total loss value of its internal isolator, adjustable amplifier, and adjustable attenuator; S 21 (rx, f) is the total loss calibration value in the link, mainly including the total loss value of the second link switch, fixed attenuator, combiner, first link switch, and related lines

[0112] Control the antenna switch to the preset second Theta angle, and repeat the above EIS measurement steps to complete the EIS measurement of the second Theta angle

[0113] Control the switching center turntable to rotate to the Phi angle as the second angle, and repeat the above EIS measurement steps to complete the EIS measurement of all Phi and Theta angles

[0114] The following is an explanation of the equivalent radiation sensitivity EIS measurement steps in combination with the device

[0115] Based on the above device, the method for measuring the equivalent radiation sensitivity EIS of the Internet of Things communication device antenna includes the steps:

[0116] 1. Similar to the above embodiments, before the test, each part of the path is calibrated and confirmed, including the air path loss of the test antenna and the test turntable center path in the anechoic chamber, including the losses of each part in the link. Among them, the link loss values of each part in the signal adjustment device 6 are calibrated. Since the two paths of the combiner have the characteristics of equal amplitude and equal phase, for the sake of simplifying the description of this embodiment, it is assumed that its performance is in an ideal state. In actual engineering applications, the loss values of the two ports of each combiner need to be calibrated separately. The specific calibration method will not be elaborated here.

[0117] 2. Place the device under test A at the center of the turntable of the multi-probe anechoic chamber 1, and place the device under test B for auxiliary testing in the test bracket 202 of the shielding box 2, and keep the relative position with the signal coupling board 201 unchanged.

[0118] 3. Control the central turntable 101 to be at the first Phi angle, and control the antenna switching switch 102 to be at the first angle of Theta angle; control the first link switching switch 3 to be connected at a-a' and b-b'. Further set the adjustable attenuator 613 and the amplifier 612 in the first link signal control device 610 and the second link signal control device 620 to an initial value to ensure a relatively ideal initial value for the communication link loss.

[0119] 4. Control the wireless information interaction between the device under test A and the device under test B, and control the connection mode of the second link switching switch 641 to be in the connection states of a-b' and b-a'. In the current connection states of the first link switching switch 3 and the second link switching switch 641, the communication antenna 111 is connected to the common end of the third combiner 633. One signal end of the third combiner 633 is connected to the signal measuring instrument 5. The signal of the communication antenna 111 can enter the signal measuring instrument 5 through the third combiner 633. The other signal end of the third combiner 633 is connected to the first combiner 631 and then to the signal coupling board 201. Set the acquisition frequency of the signal measuring instrument 5 to be the same as the output signal frequency of the device under test A, and measure the power value. According to this power value and the link insertion loss, the radiation power value of the signal coupling board 201 can be calculated. Adjust the loss value of the second link signal control device 620 according to the power value measured by the instrument to ensure that the device under test B has sufficient received signal strength and ensure the stability of the link during the test.

[0120] 5. Lock the connection state of the second link switching switch 641 to the a-a' and b-b' connections; at this time, the signal measuring instrument 5 is connected to a signal terminal of the second combiner 632, and the signal of the signal coupling board 201 can enter the signal measuring instrument 5 through the first combiner 631 and the second combiner 632. Set the acquisition frequency of the signal measuring instrument 5 to be the same as the output signal frequency of the device under test B, and read the power value Power_eis of the signal measuring instrument 5 at this time. According to this power value and the link insertion loss, the power value radiated by the detection antenna 112 can be calculated, and the loss value of the first link signal control device 610 is adjusted according to the power value measured by the instrument to ensure that the device under test A has sufficient received signal strength and ensure the stability of the link in the initial test state.

[0121] 6. Increase the loss value of the first link signal control device 610 by a certain step value to reduce the power value radiated by the detection antenna 112, and judge whether the communication performance between the device under test A and the device under test B meets the requirements of the preset worst-case scenario. If the preset requirements are met, further increase the loss value of the first link signal control device 610 until the preset requirements are reached. Record the Power_eis and the loss value S of the link signal control device 610 at this time. 21 (610, f).

[0122] 7. Calculate this angle EIS (theta，phi) value, the formula is as follows:

[0123] EIS (theta，phi) = Power_eis - S 21 (OTA, f) - S 21 (610, f) - S 21 (rx, f)

[0124] In the formula: EIS (theta，phi) is the equivalent radiation sensitivity value (unit: dBm) of the (theta, phi) angle; Power_eis is the power value measured by the current signal measuring instrument 5 (unit: dBm); S 21 (OTA, f) is the total value of the space loss between the detection antenna 112 and the device under test A at the current angle in the anechoic chamber, as well as the total loss of the antenna switching switch and related lines (unit: dB); S 21 (610, f) is the loss value of the link signal control device 610, including the total loss of its internal isolator, adjustable amplifier, and adjustable attenuator (unit: dB); S 21 (rx, f) is the total value of other loss calibrations in the link, mainly including the total loss of the second link switching switch 641, the third fixed attenuator 603 and the fourth fixed attenuator 604, the second combiner 632, the first link switching switch 3 and related lines (unit: dB).

[0125] 8. Control the antenna switch 102 so that the Theta angle is other second angles, and repeat steps 4 to 8 to complete the EIS measurements for all other second angles of the Theta angle.

[0126] 9. Control the switching center turntable 101 to rotate to other second angles of the Phi angle, and repeat steps 4 to 9 to complete the EIS measurements for all Phi and theta angles; record the EIS measurement results for all angles. The above embodiments can complete the measurement of EIS in the antenna system.

[0127] Further, the present invention further includes a communication distance test step: respectively complete the EIRP and EIS measurements for each angle of the device under test A based on the device under test B, and record them as EIRP DUT_A , EIS DUT_A ; Exchange the placement positions of the device under test A and the device under test B, and repeat the above EIRP and EIS measurement steps to obtain the EIRP and EIS difference records for each angle of the device under test B based on the device under test A, recorded as EIRP DUT_B , EIS DUT_B ; Calculate the communication distance between the two devices without obstruction according to the following formula:

[0128]

[0129]

[0130] In the formula: R (A-B) is the transmission distance of the signal transmitted by the device under test A and received by the device under test B, and R (B-A) is the transmission distance of the signal transmitted by the device under test B and received by the device under test A; EIRP DUT_A(theta1，phi1) and EIS DUT_A(theta1，phi1) are the equivalent radiated power and equivalent radiation sensitivity of the device under test in the direction of the angle (theta1, phi1) respectively, and EIRP DUT_B(theta2，phi2) and EIS DUT_B(theta2，phi2) are the equivalent radiated power and equivalent radiation sensitivity of the device under test in the direction of the angle (theta2, phi2) respectively; f is the communication frequency; theta1 is the preset first Theta angle; theta2 is the preset second Theta angle; phi1 is the preset first Phi angle; phi2 is the preset second Phi angle; the communication distance between the two communication devices takes the minimum value: R = min(R (A-B) , R (B-A) ).

[0131] The following describes the communication distance test method in combination with the device, and the communication distance measurement method for the Internet of Things communication device based on the device:

[0132] According to the above step description, complete the EIRP and EIS of the device under test A at various angles based on the device under test B respectively; since the communication distance between communication systems must also be known by knowing the EIRP and EIS values of the two devices of the communication system respectively. Therefore, the method steps for measuring the accurate communication distance are as follows:

[0133] 1. According to the above step description, complete the EIRP and EIS of the device under test A at various angles based on the device under test B respectively, and record the differences as EIRP DUT_A , EIS DUT_A .

[0134] 2. Change the relative positions of the device under test A and the device under test B, place the device under test B in the multi-probe anechoic chamber 1, and place the device under test A in the shielding box 3.

[0135] 3. Referring to the EIRP and EIS measurement methods of the device under test A, the EIRP and EIS of the device under test B at various angles based on the device under test A can be obtained, and record the differences as EIRP DUT_B , EIS DUT_B .

[0136] 4. Calculate the communication distance between the two devices without obstruction according to the formula:

[0137] 5.

[0138] 6.

[0139] In the formula: R (A-B) is the distance that the signal transmitted by the device under test A and received by the device under test B can be transmitted (unit: km); R (B-A) is the distance that the signal transmitted by the device under test B and received by the device under test A can be transmitted (unit: km); EIRP DUT_A(theta1，phi1) and EIS DUT_A(theta1，phi1) are the equivalent radiated power and equivalent radiation sensitivity (unit: dBm) of the device under test in the direction of the angle (theta1, phi1) respectively; EIRP DUT_B(theta2，phi2) and EIS DUT_B(theta2，phi2) are the equivalent radiated power and equivalent radiation sensitivity (unit: dBm) of the device under test B in the direction of the angle (theta2, phi2) respectively; f is the communication frequency unit GHz, and the communication distance between the two communication devices takes the minimum value: R = min(R (A-B) , R (B-A) ). In this way, the test of the communication distance can be completed.

[0140] In some embodiments, determining whether the communication performance between the device under test A and the device under test B meets the preset worst-case requirements includes the steps of: sending specific information from the device under test A to the device under test B, and presetting that the device under test B will send the original information back to the device under test A after receiving the information; after receiving the returned information, the device under test A compares it with the sent information to determine whether the device under test B has successfully received the information. That is, the loopback judgment method is used for judgment. As Figure 5 shown, the loopback judgment method means: sending specific information to the device under test, and presetting that the device under test will send the original information back to the sender after receiving the information. After receiving the returned information, the sender compares it with the sent information to determine whether the device under test has successfully received the information. A prerequisite for this method is that the underlying software or application layer software of the device under test needs to support the function of automatic back transmission.

[0141] Or in some embodiments, determining whether the communication performance between the device under test A and the device under test B meets the preset worst-case requirements includes the steps of: sending specific information from the device under test A to the device under test B, reading the received information from the device under test B through wired or wireless information interaction, and comparing it with the sent information for judgment. This is the direct-through judgment method. The direct-through judgment method means: sending specific information to the device under test, reading the received information from the device under test through wired, wireless or other information interaction methods, and comparing it with the sent information for judgment. This method requires that the device under test can support the reading of information physically and software-wise.

[0142] For some devices under test that do not meet the above conditions, or in cases where the above conditions result in low test efficiency and high economic costs. For example, when the switch panel used in smart home generates the action of the switch relay after receiving a wireless control command, the wireless communication can be judged to be successful by judging the opening and closing of the relay during the test. This method will cause great inconvenience during the test, especially when the device under test is placed in a dark room.

[0143] Based on the above problem description, a determination method is proposed based on the device of the present invention: The judgment of whether the communication performance between the device under test A and the device under test B meets the requirements of the preset worst-case scenario includes the steps of: connecting the switching switch in the second state so that the signal measuring instrument is connected to the communication antenna of the anechoic chamber, setting the reading mode of the signal measuring instrument to the time-domain scanning mode. During the test, the communication antenna first receives the electromagnetic signal radiated by the detection antenna, and then receives the electromagnetic signal radiated by the device under test A to form a complete signal communication process; pre-record a normal and complete waveform of a communication link under normal communication conditions, including the time interval information, waveform amplitude information, and waveform width information of the waveform. The normal and complete waveform includes all waveforms that have successfully completed information interaction and can represent successful communication; during the EIS measurement, the waveform situation during the interaction process is read through the signal measuring instrument, and compared with all the recorded normal waveforms in sequence to determine whether the communication is successful.

[0144] The above method is to judge whether the communication performance between the device under test A and the device under test B meets the requirements of the preset worst-case scenario in step 6 during the EIS measurement. The judgment method is to connect the second-link switching switch 641 in the a-b', b-a' connection mode, set the reading mode of the signal measuring instrument 5 to the time-domain scanning mode. At this time, the signal measuring instrument 5 is connected to the communication antenna 111 of the anechoic chamber. During the test, the communication antenna can first receive the electromagnetic signal 01 radiated by the detection antenna, and then receive the electromagnetic signal 02 radiated by the device under test A to form a complete signal communication process. Pre-record a normal and complete waveform of a communication link under normal communication conditions, including the time interval information, waveform amplitude information, waveform width, etc. of the waveform. The normal and complete waveform should include all waveforms that have successfully completed information interaction and can represent successful communication; during the EIS measurement, the waveform situation during the interaction process is read through the signal measuring instrument, and compared with all the recorded normal waveforms in sequence to determine whether the communication is successful. As Figure 6 and Figure 7 respectively illustrate that the communication antenna 111 receives the signals radiated by the detection antenna 112 and the device under test A. Since the amplitude values of the two signals received by the communication antenna 111 are not exactly the same, it is possible to comprehensively judge which signal is radiated by the detection antenna and which signal is radiated by the device under test A through the amplitude value and the signal insertion loss between the detection antenna 112 and the communication antenna 111.

[0145] As Figure 6 shown, Figure 6 represents the waveform schematic diagram collected by the signal measuring instrument 5. The figure shown is only a simple and easy-to-understand expression of the judgment method, and the method adopted in actual engineering applications is more complex and rigorous. As Figure 7 shown, Figure 7Used to determine whether the communication between the communication device A to be tested and the device B to be tested is normal, for the test judgment of EIS. This method is a supplement to step 6 of the EIS test. After the judgment is completed, the connection mode of the second link switching switch 641 needs to be changed to a-a' and b-b' to continue the measurement step of EIS.

[0146] The present invention also provides a storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the above method are implemented. The storage medium of this embodiment can be a storage medium set in an electronic device. The electronic device can read the content of the storage medium and achieve the effect of the present invention. The storage medium can also be a separate storage medium. When the storage medium is connected to the electronic device, the electronic device can read the content in the storage medium and implement the method steps of the present invention. The storage medium of the present invention can be a storage medium in a control and test system. The system running this storage medium can implement the measurement of antenna performance, including measuring performance conditions such as EIS, EIRP, and communication distance.

[0147] The present invention also provides a test system, including a memory and a processor. A computer program is stored on the memory. When the computer program is executed by the processor, the steps of the method according to any one of the embodiments of the present invention are implemented. The test system of the present invention can be a control and test system, which can implement the test of antenna performance, including measuring performance conditions such as EIS, EIRP, and communication distance.

[0148] It should be noted that although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, any changes and modifications made to the embodiments described in this article, or equivalent structural or equivalent process transformations made using the content of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. An antenna testing method for an Internet of Things system, characterized in that, The steps are as follows: Place the device A to be tested at the center of the turntable in the multi-probe anechoic chamber, and place the device B to be tested for auxiliary testing in the test bracket of the shielding box; Control the center turntable to a preset first Phi angle, and control the antenna switching switch to a preset first Theta angle; Control the connection mode of the first link switching switch to be the connection for realizing the second state; Control the wireless information interaction between the device A to be tested and the device B to be tested, and control the connection mode of the second link switching switch to be the connection state of the first state; Set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device B to be tested, and be in the state of measuring the power value; Calculate the power value radiated by the communication antenna according to the power value collected by the signal measuring instrument and the link insertion loss, and adjust the loss value of the first link signal control device according to the power value measured by the instrument to ensure that the device A to be tested has sufficient received signal strength; Control the device A to be tested to continuously radiate signals at the maximum power, and control the connection mode of the second link switching switch to be the connection state of the second state; Set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device A to be tested, and record the measured power value as Power_eirp; Calculate the radiated power value of the coupling board according to the power value Power_eirp and the link insertion loss, and adjust the loss value of the second link signal control device according to the power value measured by the instrument to ensure that the device B to be tested has sufficient received signal strength; Calculate the equivalent isotropically radiated power (EIRP) of this angle (theta,phi) value, the formula is as follows: EIRP (theta,phi) = Power_eirp + S 21 (OTA, f) + S 21 (tx, f) Where: EIRP (theta,phi) is the equivalent radiated power value at the (theta, phi) angle; Power_eirp is the power value measured by the signal measuring instrument; S 21 (OTA,f) is the total value of the space loss between the current angle detection antenna in the anechoic chamber and the device under test A, as well as the total loss of the antenna switch and related lines; S 21 The total value of other losses in the (tx,f) link, mainly including the total loss of the switch, fixed attenuator, combiner, switch and related lines; Control the antenna switching switch to a preset second Theta angle, repeat the measurement steps, and complete the EIRP measurement of the second Theta angle; Control the center turntable to rotate to a preset second Phi angle, repeat the above test of the Theta angle, and complete the EIRP measurement of all Phi and Theta angles.

2. The method for testing the antenna of the Internet of Things system according to claim 1, wherein It further includes the step: Set the adjustable attenuator and amplifier in the first link signal control device and the second link signal control device to a preset initial value.

3. The method for testing an antenna of an Internet of Things system according to claim 1, wherein When placing the device A to be tested at the center of the turntable in the multi-probe anechoic chamber, it further includes the step: Calibrate and confirm each part of the path, including calibrating the air path loss of the path between the test antenna in the anechoic chamber and the center of the test turntable, and the losses of each part in the link.

4. The method for testing an antenna of an Internet of Things system according to claim 1, wherein It further includes the equivalent isotropic radiated sensitivity (EIS) measurement step: Control the wireless information interaction between the device A to be tested and the device B to be tested, and control the connection mode of the second link switching switch to be locked in the connection state of the first state; Set the acquisition frequency of the signal measuring instrument to be the same as the output signal frequency of the device B to be tested, and read the power value Power_eis of the signal measuring instrument at this time; Calculate the power value radiated by the detection antenna according to this power value and the link insertion loss, and adjust the loss value of the first link signal control device according to the power value measured by the instrument to ensure that the device A to be tested has sufficient received signal strength; Increase the loss value of the first link signal control device according to the preset step value to reduce the power value radiated by the detection antenna, and determine whether the communication performance between the device under test A and the device under test B meets the preset worst-case requirements; if the preset requirements are met, further increase the loss value of the first link signal control device until the preset requirements are reached; record the Power_eis and the loss value S of the first link signal control device at this time 21 (610,f); Calculate this angle EIS (theta,phi) value, the formula is as follows: EIS (theta,phi) = Power_eis - S 21 (OTA,f) - S 21 (610,f) - S 21 (rx,f) Where: EIS (theta,phi) is the equivalent radiation sensitivity value at the (theta, phi) angle; Power_eis is the power value measured by the current signal measuring instrument; S 21 (OTA,f) is the total space loss and line loss between the current angle detection antenna in the anechoic chamber and the device under test A; S 21 (610,f) is the loss value of the link signal control device, including the total loss of its internal isolator, adjustable amplifier, and adjustable attenuator; S 21 (rx,f) is the total calibration value of other losses in the link, mainly including the total loss of the second link switch, fixed attenuator, combiner, first link switch, and related lines; Control the antenna switching switch to a preset second Theta angle, repeat the above EIS measurement steps, and complete the EIS measurement of the second Theta angle; Control the turntable of the switching center to rotate to the second angle of Phi, repeat the above EIS measurement steps, and complete the EIS measurement for all Phi and Theta angles.

5. The method for testing an antenna of an Internet of Things system according to claim 4, wherein It further includes the steps of: Complete the EIRP and EIS measurements of the DUT A at various angles based on the DUT B respectively, and record them as EIRP DUT_A , EIS DUT_A ; Swap the placement positions of Device Under Test A and Device Under Test B, repeat the above EIRP and EIS measurement steps, and record the differences in EIRP and EIS at various angles of Device Under Test B based on Device Under Test A as EIRP DUT_B ,EIS DUT_B ; Calculate the communication distance between the two devices without occlusion according to the following formula: Where: R (A-B) is the transmission distance for the signal transmitted by the device under test A and received by the device under test B, and R (B-A) is the transmission distance for the signal transmitted by the device under test B and received by the device under test A; EIRP DUT_A(theta1,phi1) and EIS DUT_A(theta1,phi1) are the equivalent isotropically radiated power and the equivalent isotropic sensitivity of the device under test in the direction of the angle (theta1, phi1), respectively, and EIRP DUT_B(theta2,phi2) and EIS DUT_B(theta2,phi2) are the equivalent isotropically radiated power and the equivalent isotropic sensitivity of the device under test in the direction of the angle (theta2, phi2), respectively; f is the communication frequency; theta1 is the preset first Theta angle; theta2 is the preset second Theta angle; phi1 is the preset first Phi angle; phi2 is the preset second Phi angle; The minimum communication distance between two communication devices: R = min(R (A-B) , R (B-A) ).

6. The method for testing an antenna of an Internet of Things system according to claim 4, characterized in that, The step of determining whether the communication performance between the device under test A and the device under test B meets the requirements of the preset worst-case scenario includes: Connect the switching switch in the second state so that the signal measuring instrument is connected to the communication antenna of the anechoic chamber, set the reading mode of the signal measuring instrument to the time-domain scanning mode. During the test, the communication antenna first receives the electromagnetic signal radiated by the detection antenna, and then receives the electromagnetic signal radiated by the device under test A to form a complete signal communication process; Pre-record a normal and complete waveform of a communication link under normal communication conditions, including the time interval information, waveform amplitude information, and waveform width information of the waveform. The normal and complete waveform is a waveform that includes all successfully completed information interactions and can represent successful communication; during the EIS measurement process, read the waveform situation during the interaction process through the signal measuring instrument, and compare it with all the recorded normal waveforms in turn to determine whether the communication is successful.

7. The method for testing an antenna of an Internet of Things system according to claim 4, wherein The step of determining whether the communication performance between the device under test A and the device under test B meets the requirements of the preset worst-case scenario includes: sending specific information from the device under test A to the device under test B, and presetting that the device under test B will return the original information to the device under test A after receiving the information; After the device under test A receives the returned information, compare it with the sent information to determine whether the device under test B has successfully received it.

8. The method for testing an antenna of an Internet of Things system according to claim 4, characterized in that, The step of determining whether the communication performance between the device under test A and the device under test B meets the requirements of the preset worst-case scenario includes: sending specific information from the device under test A to the device under test B, reading the received information from the device under test B through wired or wireless information interaction, and comparing it with the sent information for judgment.

9. Storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 8.

10. A test system, characterized in that: It includes a memory and a processor. A computer program is stored on the memory, and when the computer program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 8.

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