SAR (Synthetic Aperture Radar) test method, electronic equipment, system and storage medium

Abstract

The embodiment of the invention provides an SAR test method, electronic equipment, a system and a storage medium, and relates to the technical field of SAR test, and the method comprises the steps: obtaining a distance value between a to-be-tested antenna of to-be-tested equipment and the top end of the to-be-tested equipment; based on the distance value and a preset angle calculation function, calculating a placement angle of the to-be-tested device relative to the body model, the placement angle being an included angle between a plane of the to-be-tested device and an upper surface of the body model under the condition that the top end of the to-be-tested device is in contact with the body model, the placing angle is the same as an included angle between the to-be-tested antenna and the head model when the head model is used for testing; controlling the mechanical arm to place the to-be-tested equipment on the body model according to the placement angle; the SAR obtained through body model testing is obtained and serves as a testing head SAR; and judging whether the radiation of the to-be-tested antenna to the head of the human body is compliant based on the test head SAR. Therefore, a head model does not need to be purchased, and the test cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of SAR testing technology, and in particular to a SAR testing method, electronic equipment, system and storage medium. Background Art

[0002] Specific Absorption Rate (SAR) is a measure of radio frequency exposure. It refers to the radio frequency energy per unit mass of the exposed object per unit time. It is a measure of the rate at which an organism absorbs radio frequency energy from the object being measured (mobile phone or other electronic device). The unit is W / kg or mW / g. Biological studies have shown that when the human body is exposed to an electromagnetic field with a SAR value that is too large, the heating of human tissues can reach a level that is harmful to health. Therefore, the International Commission on Non-Ionizing Radiation (ICNIRP) has set limits for the whole body and local average SAR for the public.

[0003] Currently, the SAR test system can be used to test whether the SAR of electronic devices to the human head (referred to as head SAR) exceeds the limit, and to test whether the SAR of electronic devices to the human body (referred to as body SAR) exceeds the limit. Head SAR is for electronic devices used near the side of the human head, and the typical application scenario is that users answer and make calls through voice. Body SAR is for electronic devices used near the human trunk or limbs (excluding head accessories), and the typical scenario is data communication.

[0004] In order to test electronic devices, head models and body models are needed to simulate the state of human body using electronic devices, and probes on the inner surface of the head models and body models are used to identify the electric field strength, so as to calculate the SAR using the electric field strength. Electronic device manufacturers need to be equipped with a complete SAR test system. However, the price of head models used to test head SAR is expensive, and electronic device manufacturers cannot afford the high cost of head models. Summary of the invention

[0005] The present application provides a SAR testing method, electronic equipment, system and storage medium to save the testing cost of SAR testing.

[0006] In a first aspect, an embodiment of the present application provides a SAR testing method, comprising:

[0007] Obtain the distance value between the antenna under test of the device under test and the top of the device under test; calculate the placement angle of the device under test relative to the body model based on the distance value and a preset angle calculation function, wherein the placement angle is the angle between the plane of the device under test and the upper surface of the body model when the top of the device under test is in contact with the body model, and the placement angle is the same as the angle between the antenna under test and the head model when the head model is used for testing; control the robotic arm to place the device under test on the body model according to the placement angle; obtain the SAR obtained from the body model test as the test head SAR; and determine whether the radiation of the antenna under test to the human head is compliant based on the test head SAR.

[0008] By adopting this method, the electronic device can obtain the distance value between the antenna to be tested of the device to be tested and the top of the device to be tested, and then substitute the distance value into the preset angle calculation function to obtain the placement angle. Then, placing the device to be tested on the body model according to the placement angle is equivalent to simulating the angle between the device to be tested and the head model when the device to be tested is tested using a head model, so that the test head SAR can be obtained by testing the body model, and the test head SAR can be used to determine whether the radiation of the antenna to be tested to the human head is compliant. In other words, the embodiment of the present application can use a body model to test the head SAR, so there is no need to purchase a head model separately, and a large number of test cases for testing the head SAR can be obtained using the body model, which can save costs.

[0009] In one possible implementation, judging whether the radiation of the antenna to be tested to the human head is compliant based on the test head SAR includes: judging whether the test head SAR is less than the preset head SAR limit, the preset head SAR limit is obtained based on the standard head SAR limit and the test error, and the test error is used to represent the error generated when the head SAR test is performed using a body model; if so, it is determined that the radiation of the antenna to be tested to the human head is compliant; if not, it is determined that the radiation of the antenna to be tested to the human head is not compliant. The test error may be an error caused by power fluctuations and an error in the placement angle. In this way, the influence of the test error on the test results can be eliminated, and the cost can be reduced on the basis of improving the accuracy of the test results, and the risk of unqualified random inspections can be reduced.

[0010] In a possible implementation, the preset head SAR limit is determined by the following steps:

[0011] The head SAR of the experimental equipment is tested using a body model to obtain the experimental head SAR; the head SAR of the experimental equipment is tested using a head model to obtain the real head SAR; the ratio of the experimental head SAR to the real head SAR is used as the test error; the preset head SAR limit is calculated based on the standard head SAR limit and the test error. In this way, the subsequent SAR test using the preset head SAR limit can eliminate the influence of the test error and obtain accurate test results.

[0012] In one possible implementation, the experimental antenna of the experimental equipment has the same frequency band as the antenna to be tested; the preset head SAR limit is calculated based on the standard head SAR limit and the test error, including: taking the product of the standard head SAR limit and the test error as the preset head SAR limit. If the application scenario is to test antennas in only one frequency band, the preset head SAR limit can be calculated based on the experimental antenna of the frequency band. In this way, the test error of the antenna in the frequency band can be eliminated, and the preset head SAR limit can be used to accurately measure whether the radiation of the antenna to be tested in the frequency band is compliant.

[0013] In a possible implementation, there are multiple experimental devices, and the frequency band of the experimental antenna of each experimental device is different; the preset head SAR limit is calculated based on the standard head SAR limit and the test error, including: for each experimental device, the product of the test error corresponding to the experimental device and the standard head SAR limit is used as a candidate head SAR limit; the minimum candidate head SAR limit is selected from the candidate head SAR limits of each experimental device as the preset head SAR limit. In the embodiment of the present application, the minimum candidate head SAR value is selected as the preset head SAR limit, which is equivalent to using the most conservative head SAR limit, which can control the market sampling risk to the greatest extent and improve the quality of electronic products leaving the factory.

[0014] In a possible implementation, the angle calculation function is obtained by the following steps:

[0015] A rectangular coordinate system is established for the head model, and the tangent expression of the device under test is obtained according to the placement position of the device under test and the head model during the standard test. The tangent expression is the expression of the line between the ear of the head model's outer contour and the most convex point of the face on the same side; according to the placement position, a preset number of coordinate points are sampled from the ear of the head model's outer contour to the chin, and the sampled coordinate points are fitted into a curve expression. The curve expression is used to represent the curve formed by the probe points of the head model's outer contour; the angle calculation function is obtained using the tangent expression, the curve expression and the trigonometric function. It can be seen that the embodiment of the present application can calculate the angle calculation function according to the placement position between the device under test and the head model, so that the angle calculation function can accurately represent the angle between the device under test and the head model when the head model is used to perform the head SAR test. In this way, the placement angle calculated by the angle calculation function is used to place the device under test on the surface of the body model, which can replace the head SAR test using the head model, so there is no need to purchase the head model, which can save costs.

[0016] In one possible implementation, the tangent expression is f 1 (x 1 )=-0.0841x 1 +8,x 1is the abscissa of the point on the tangent line in the rectangular coordinate system;

[0017] The curve expression is where p 1 、p 2 、p 3 、p 4 、p 5 and p 6 are all preset polynomial coefficients, x 2 is the abscissa of the point on the curve in the rectangular coordinate system;

[0018] The angle calculation function is: θ = arctan ((8-p 6 )×(0.9964l) -1 -p 1 ×(0.9964l) 4 -p 2 ×(0.9964l) 3 -p 3 ×(0.9964l) 2 -p 4 ×(0.9964l)-p 5 )-arctan0.0841, where θ is the placement angle and l is the distance value.

[0019] In a second aspect, an embodiment of the present application provides an electronic device, comprising: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code includes computer instructions, and the one or more processors call the computer instructions to enable the electronic device to execute the method described in the first aspect and any possible implementation method of the first aspect.

[0020] In a third aspect, an embodiment of the present application provides a chip system, which is applied to an electronic device, and the chip system includes one or more processors, which are used to call computer instructions so that the electronic device executes the method described in the first aspect and any possible implementation method of the first aspect.

[0021] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, including a computer program. When the computer program runs on an electronic device, the electronic device executes the method described in the first aspect and any possible implementation method of the first aspect.

[0022] In a fifth aspect, an embodiment of the present application provides a computer program product, the computer program product comprising: a computer program code, when the computer program code runs on an electronic device, enables the electronic device to execute the method described in the first aspect and any possible implementation method of the first aspect.

[0023] In a sixth aspect, an embodiment of the present application provides a SAR test system, the system comprising a device to be tested, a robotic arm, a body model, and the electronic device of the second aspect;

[0024] A robotic arm, used to place the device under test on the body model according to the placement angle provided by the electronic device;

[0025] Body model used to feed back the SAR measured by the electronic device.

[0026] It can be understood that the electronic device provided in the second aspect, the chip system provided in the third aspect, the computer storage medium provided in the fourth aspect, the computer program product provided in the fifth aspect, and the SAR test system provided in the seventh aspect are all used to execute the method provided in the present application. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments 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 creative labor.

[0028] Figure 1 is a schematic diagram of a head model in the prior art;

[0029] Figure 2 is a schematic diagram of a body model in the prior art;

[0030] Figure 3 A schematic diagram of a SAR test system provided in an embodiment of the present application;

[0031] Figure 4 A flow chart of a SAR testing method provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the antenna position of a mobile phone provided in an embodiment of the present application;

[0033] Fig. 6A A schematic diagram of the three-dimensional structure of a head model provided in an embodiment of the present application;

[0034] Figure 6B A schematic cross-sectional view of a head model provided in an embodiment of the present application;

[0035] Figure 6C A schematic diagram of a rectangular coordinate system established in a cross section of a head model provided in an embodiment of the present application;

[0036] Fig.6D This is a schematic diagram of the MATLAB interface when fitting a curve expression in an embodiment of the present application;

[0037] Fig. 7A and Figure 7B It is a schematic diagram of the angle relationship between the tangent line and the curve in the rectangular coordinate system;

[0038] Figure 8A-8D This is a schematic diagram of the effect of placing a mobile phone on a body model at different angles;

[0039] Fig. 9 is a schematic diagram of the comparison between the test results of the body model and the test results of the head model;

[0040] Fig.10 A schematic diagram of the overall solution of the SAR testing method provided in an embodiment of the present application;

[0041] Fig.11 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0043] It should be noted that, in this application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0044] To facilitate understanding, relevant concepts involved in the embodiments of the present application are first introduced.

[0045] SAR is the electromagnetic power absorbed or consumed by biological tissue (including human tissue) per unit time and per unit mass, and is measured in W / kg. The larger the SAR, the greater the impact on the organism, and vice versa. The smaller the SAR, the smaller the impact on the organism. In order to reduce the harm of electromagnetic radiation to the human body, electronic products must undergo SAR testing before leaving the factory.

[0046] According to the EN / IEC 62209-1 and EN / IEC 62209-2 standards developed by the International Electrotechnical Commission, the SAR test scenarios include head SAR and body SAR. In addition, national standard organizations have also specified SAR limit standards for different test scenarios. For example, the body SAR limit and head SAR limit specified by the Federal Communications Commission (FCC) of the United States are both 1.6W / kg, the SAR limit specified by the European Community (CE) is 2.0W / kg, the SAR limit specified by Industry Canada (IC) is 1.6W / kg, and the SAR limit specified by China is 2.0W / kg.

[0047] At present, the SAR measurement systems of certification laboratories mainly include dose assessment system (DASY) and cSAR. For example, cSAR3D is an array diode probe fast SAR measurement system developed by SPEAG of Switzerland, which can meet the 300MHz~10GHz SAR test. Electronic equipment manufacturers can configure cSAR3D measurement system for R&D testing.

[0048] For the head SAR test scenario, the head model (cSAR3D Head) used for testing head SAR can be used for testing. Figure 1 As shown, taking the need to test a mobile phone as an example, the head model is placed on a platform, and the mobile phone needs to be fixed on the head model through a bracket and a clip to simulate the state of answering a call. An array diode probe is set on the inner surface of the head model, which can identify the electric field strength through the probe to deduce the head SAR.

[0049] For the body SAR test scenario, the body model (cSAR3D Flat) used for testing body SAR can be used for testing. Figure 2 As shown, the inner surface of the body model is provided with array diode probes, which can also be called probes. These diode probes can form a planar array system, that is, Figure 2 There are probes under the grid area in the figure. For example, if you need to test a mobile phone, you can place the phone flat on the surface of the body model to simulate the state of the phone being close to the body, and then use the probe to identify the electric field strength to deduce the body SAR.

[0050] However, the unit price of head models is relatively expensive, with a set of head models costing up to 2 million yuan. In order to complete the construction of head SAR automated testing capabilities, factories need multiple sets of head models, which is very expensive and has a long delivery cycle. If the factory lacks head SAR test cases, it will face the problem of non-compliance in market random inspections, which will cause great losses to the company's image, market, and economy.

[0051] In order to solve the above problems, an embodiment of the present application provides a SAR testing method. This method can use a body model to test head SAR, that is, there is no need to use a head model. This allows the construction of test cases that can cover head SAR through the factory's existing body equipment without adding any equipment, thereby achieving automated testing.

[0052] For ease of understanding, the SAR test system involved in the embodiment of the present application is first introduced. Figure 3 As shown, the system includes an electronic device 301 , a mechanical arm 302 , a body model 303 and a device to be tested 304 .

[0053] The electronic device 301 is connected to the mechanical arm 302 , and the electronic device 301 is connected to the body model 303 .

[0054] The electronic device 301 may be a laptop computer, a desktop computer, or the like. Figure 3 In the figure, the electronic device 301 is taken as a notebook computer as an example.

[0055] The mechanical arm 302 has an automatic placement program, which can obtain the placement angle provided by the electronic device 301, and then place the device to be tested 304 on the body model 303 according to the placement angle. Figure 3 The robot arm 302 in the figure is only an example, and the embodiment of the present application does not limit the type of the robot arm 302.

[0056] The body model 303 is used to test the head SAR of the device under test 304 and feed back the head SAR obtained by the test to the electronic device 301 .

[0057] In the embodiment of the present application, the device under test 304 is taken as a mobile phone for example. The device under test 304 may be any type of electronic product that may generate radiation, such as a wearable device, a tablet computer, etc.

[0058] exist Figure 3 Based on the SAR test system shown in FIG. 1 , an embodiment of the present application provides a SAR test method, which is applied to the above-mentioned electronic device 301, such as Figure 4 As shown, the method includes:

[0059] S401 : Obtain a distance value between an antenna under test of the device under test and a top of the device under test.

[0060] Taking a mobile phone as an example, the device to be tested may be provided with an antenna position diagram of the mobile phone and a distance value between the antenna and the top of the mobile phone from the developer.

[0061] like Figure 5 As shown, Figure 5 A schematic diagram of the antenna position of a mobile phone is exemplarily shown, and the number of the antenna can be obtained, that is, antenna 9, and the distance value of the antenna from the top of the mobile phone is 26.9 mm.

[0062] S402: Calculate the placement angle of the device under test relative to the body model based on the distance value and a preset angle calculation function.

[0063] The placement angle is the angle between the plane of the device under test and the upper surface of the body model when the top of the device under test contacts the body model. This placement angle is the same as the angle between the antenna under test and the head model when the head model is used for testing. Figure 3 The angle between the device under test 304 and the body model 303 in FIG.

[0064] In order to ensure the test accuracy, the distance value is different, and the corresponding placement angle is also different. The angle calculation function is used to express the corresponding relationship between the angle between the tangent line where the antenna to be tested is located and the head model and the above distance value when the head model is used for testing.

[0065] S403, controlling the robotic arm to place the device to be tested on the body model according to the placement angle.

[0066] Among them, the electronic device can send the calculated placement angle to the robotic arm, and then the automatic placement program in the robotic arm controls the movement of the robotic arm according to the placement angle, so that the robotic arm places the device to be tested on the body model according to the placement angle.

[0067] For example, Figure 3 The effect after placement is shown in FIG.

[0068] S404: Acquire the SAR obtained by the body model test as the test head SAR.

[0069] Since the angle between the device to be tested and the head model is simulated when the device to be tested is placed, in this case, the SAR obtained by testing with the body model can be used as the head SAR. In the embodiment of the present application, the head SAR obtained by testing with the body model is referred to as the test head SAR.

[0070] S405: Determine whether the radiation of the antenna to be tested to the human head complies with the regulations based on the test head SAR.

[0071] It can be understood that the electronic device can determine whether the head SAR complies with the limit value of the head SAR. If so, it is determined that the radiation of the antenna under test to the human head is compliant. Otherwise, it is determined that the radiation of the antenna under test to the human head is not compliant, and further it can be determined that the radiation of the device under test to the human head is not compliant.

[0072] By adopting this method, the electronic device can obtain the distance value between the antenna to be tested of the device to be tested and the top of the device to be tested, and then substitute the distance value into the preset angle calculation function to obtain the placement angle. Then, the device to be tested is placed on the body model according to the placement angle, which is equivalent to simulating the angle between the device to be tested and the head model when the device to be tested is tested using a head model, so that the test head SAR can be obtained by testing the body model, and the test head SAR can be used to determine whether the radiation of the antenna to be tested to the human head is compliant. In other words, the embodiment of the present application can use a body model to test the head SAR, so there is no need to purchase an additional head model, which can save costs.

[0073] In the embodiment of the present application, when a body model is used instead of a head model for SAR testing, a certain placement error will occur, and the receiving power fluctuation of the probe of the body model and the transmitting power fluctuation of the antenna to be tested will also cause test errors, resulting in some errors between the test head SAR tested by this method and the real head SAR. In order to improve the accuracy of the final test results, the embodiment of the present application can eliminate the influence of this error on the test results by pre-building a preset head SAR limit.

[0074] The preset head SAR limit is obtained based on the standard head SAR limit and the test error, and the test error is used to represent the error generated when the head SAR test is performed using a body model.

[0075] Furthermore, after obtaining the test head SAR during the test process, it is determined whether the test head SAR is less than the preset head SAR limit; if so, it is determined that the radiation of the antenna to be tested to the human head is compliant; if not, it is determined that the radiation of the antenna to be tested to the human head is not compliant.

[0076] In this way, the influence of test errors on test results can be eliminated, and the cost can be reduced while improving the accuracy of test results.

[0077] The following is an introduction to the method of constructing preset head SAR limits.

[0078] In the embodiment of the present application, the test head SAR obtained by using the body model test may also be referred to as the substitute body SAR. The head SAR obtained by using the body model test and the real head SAR (the head SAR obtained by using the head model test) have the following relationship:

[0079] Replaced body SAR = head SAR * σ

[0080] Among them, σ is used to represent the proportionality coefficient of the test error caused by power error and placement error.

[0081] After dividing both sides of the formula by the "head SAR limit" (standard head SAR limit), shifting σ, we get the following formula:

[0082]

[0083] In the embodiment of the present application, the head SAR limit value *σ is defined as the replaced body SAR limit value (ie, the preset SAR limit value), and the above formula is deformed to obtain:

[0084]

[0085] Since the replaced body SAR=head SAR*σ, the above formula can be transformed into replaced body SAR limit=head SAR limit*σ.

[0086] Based on the above principles, the preset head SAR limit is determined through the following steps:

[0087] Step 1: Use the body model to perform head SAR test on the experimental equipment to obtain the experimental head SAR.

[0088] The experimental device is the device under test used to calculate the preset head SAR limit, that is, the embodiment of the present application can calculate a reasonable preset head SAR limit by means of a preliminary experiment. Accordingly, the experimental head SAR is the test head SAR obtained by testing with a body model instead of a head model, that is, the replaced body SAR in the above formula.

[0089] Step 2: Use the head model to perform head SAR test on the experimental equipment to obtain the real head SAR.

[0090] The head model is a standard head model, and accordingly, the real head SAR is the head SAR in the above formula.

[0091] Step 3: The ratio of the experimental head SAR to the real head SAR is taken as the test error.

[0092] It can be understood that the test error is the above-mentioned σ.

[0093] Step 4: Calculate the preset head SAR limit based on the standard head SAR limit and the test error.

[0094] It should be noted that the values ​​of test errors caused by antennas in different frequency bands are different.

[0095] In one implementation, if the manufacturer only needs to test antennas of one frequency band, the test error can be calculated according to the antenna of the frequency band, that is, the selected test equipment has the same frequency band as the antenna of the device under test during the actual test. Accordingly, step 4 can be implemented as follows: the product of the standard head SAR limit and the test error is used as the preset head SAR limit. In this way, the subsequent SAR test using the preset head SAR limit can eliminate the influence of the test error and obtain accurate test results.

[0096] In another implementation, if the manufacturer needs to test antennas of multiple frequency bands, or needs to obtain a more universal preset head SAR limit that is applicable to antennas of various frequency bands, the limit can be calculated for each frequency band separately, and then the minimum limit is selected as the preset head SAR limit to obtain the most conservative preset head SAR limit.

[0097] Right now,

[0098]

[0099] On this basis, there are multiple experimental devices, and the frequency band of the experimental antenna of each experimental device is different. Step 4 can be specifically implemented as follows:

[0100] For each experimental device, the product of the test error corresponding to the experimental device and the standard head SAR limit is taken as a candidate head SAR limit, and the smallest candidate head SAR limit is selected from the candidate head SAR limits of each experimental device as the preset head SAR limit.

[0101] It can be understood that a body model can be used to perform head SAR tests on each experimental device to obtain the experimental head SAR of each experimental device, and a head model can be used to perform head SAR tests on each experimental device to obtain the true head SAR of each experimental device. Then, for each experimental device, the ratio of the head SAR of the experimental device to the true SAR is used as the test error corresponding to the experimental device.

[0102] Since the SAR limit is set relatively low in factory mass production control, the stricter the test, the higher the requirements for electronic products. Therefore, in the embodiment of the present application, the smallest candidate head SAR value is selected as the preset head SAR limit, which is equivalent to adopting the most conservative head SAR limit, which can control the market sampling risk to the greatest extent and improve the quality of electronic products leaving the factory.

[0103] It should be noted that after the preset head SAR limit is calculated, it can be used in the subsequent actual testing process. There is no need to recalculate the preset head SAR limit for each test. Therefore, manufacturers do not need to purchase head models separately for actual testing, which can save costs.

[0104] In the embodiment of the present application, the angle calculation function is also pre-generated, and the angle calculation function is obtained by the following steps:

[0105] Step A: Establish a rectangular coordinate system for the head model, and obtain the tangent expression of the device under test according to the placement of the device under test and the head model during standard testing. The tangent expression is the expression of the line connecting the ear of the head model and the most convex point on the same side of the face.

[0106] According to the IEC 62209-1 standard, the three-dimensional structure of the head model is as follows: Fig. 6A The cross-sectional view of the head model is shown in Figure 6B As shown, Figure 6B The side length of each square in the grid is 10 millimeters (mm).

[0107] In the embodiment of the present application, Figure 6B The head model shown in the figure establishes a rectangular coordinate system, with the central axis of the head model as the x-axis, the vertical line from the most convex point of the ear of the head model to the central axis of the head model as the y-axis, and the intersection of the central axis and the vertical line as the coordinate origin, to establish a rectangular coordinate system, such as Figure 6C shown. Figure 6C The line segment extending from the line between the ear of the mid-head model and the most convex point on the face is the tangent line l of the simulated position of the device under test 1 ,l 1 The coordinates of the point on (x 1 ,y 1 ).

[0108] It should be noted that during the SAR test, the antenna locking step is usually performed, that is, only the power transmitted by a certain antenna in the working state is considered, while the other antennas are not in working state. In this case, the tangent line where the mobile phone antenna is located can be approximated as the straight line where the side view of the mobile phone is located when the mobile phone is placed in the corresponding position of the head model during the standard test. According to regulatory requirements, the mobile phone is placed on the surface of the head model, with the top attached to the ear of the outer contour of the head model, and the middle placed on the most convex point of the face as a support point. Therefore, the tangent line where the mobile phone antenna is located passes through the coordinate point (0, 8) of the ear of the outer contour of the head model and the coordinate point (4.4, 7.63) of the most convex point of the face. Based on this, the tangent expression can be obtained as: f 1 (x 1 )=-0.0841x 1 +8.

[0109] Step B: according to the placement position, a preset number of coordinate points are sampled from the ear to the chin of the outer contour of the head model, and the sampled coordinate points are fitted into a curve expression, which is used to represent the curve formed by the probe points of the outer contour of the head model.

[0110] The coordinate points for sampling a preset number of points can be found in Figure 6C The points at the outer contour of the head model can fit the curve l on the surface of the head model by sampling the coordinate points 2 ,l 2 The coordinates of the point on (x 2 ,y 2 ); the unit is cm.

[0111] Use MATLAB software to perform polynomial fitting on these points to generate the head model surface curve function expression:

[0112]

[0113] MATLAB is a mathematical software used for data analysis. For example, the MATLAB fitting interface is as follows: Fig.6D As shown, Fig.6D The curve in is the fitted curve, and the points near the curve are the sampled coordinate points. When the degree of the polynomial is 5, the root mean square error (RMSE) and the coefficient of determination (R-square) reach the minimum value, indicating that the error between the fitted curve and the true value is the smallest, that is, the curve has a high similarity with the outer contour of the head model, and the fitting effect is good. 1 、p 2 、p 3 、p 4 、p 5 and p 6 These are preset polynomial coefficients.

[0114] Step C: using the tangent expression and the curve expression to obtain the angle calculation function of the angle between the device under test and the head model.

[0115] Among them, Fig. 7A As shown, Fig. 7A The straight line where the line segment OP is located is the tangent line, the curve where OQ is located is the curve of the outer contour of the head model, and P(x, y1) and Q(x, y2) are the intersection points of the tangent line and the curve with the same straight line perpendicular to the x-axis respectively.

[0116] right Fig. 7A After simplification, the more intuitive effect is as follows Figure 7B Based on Figure 7B The angle relationship shown can be used to obtain the angle calculation function using trigonometric functions. The specific calculation process is:

[0117]

[0118]

[0119] Where x = cosβ × l = 0.9964l;

[0120] Can get,

[0121] Where x = 0.99641; y 1 =-0.0841x+8;

[0122] y 2 =p 1 x 5 +p 2 x 4 +p 3 x 3 +p 4 x 2 +p 5 x+p 6 ;

[0123] therefore,

[0124]

[0125] θ=α-β=arctan((8-p 6 )x -1 -p 1 x 4 -p 2 x 3 -p 3 x 2 -p 4 xp 5 )-arctan0.0841

[0126] Substituting into l we get:

[0127] θ=α-β=arctan((8-p 6 )×(0.9964l) -1 -p 1 ×(0.9964l) 4 -p 2 ×(0.9964l) 3 -p 3 ×(0.9964l) 2 -p 4 ×(0.9964l)-p 5 )-arctan0.0841.

[0128] Therefore, the angle calculation function in the embodiment of the present application is θ=arctan((8-p 6 )×(0.9964l) -1 -p 1 ×(0.9964l) 4-p 2 ×(0.9964l) 3 -p 3 ×(0.9964l) 2 -p 4 ×(0.9964l)-p 5 )-arctan0.0841.

[0129] This angle calculation function is applicable to various antenna positions.

[0130] It should be noted that the angle calculation function is pre-calculated. In the actual test process, the distance value between the antenna and the top of the device under test can be directly substituted into the function to obtain the placement angle.

[0131] In order to verify the feasibility of the angle calculation function, the distance values ​​from the working antenna of some mobile phones to the top of the mobile phone were randomly selected in the embodiment of the present application. After substituting them into the angle calculation function, the corresponding relationship between the distance value and the placement angle is shown in Table 1.

[0132] Table 1

[0133]

[0134]

[0135] In order to verify the feasibility of the SAR test method provided in the embodiment of the present application as a whole, a mobile phone was randomly selected and the distance value l=2.69 cm of one of the working antennas was obtained.

[0136] Substituting this distance value into the above angle calculation function, we can get:

[0137] θ=arctan((8-p 6 )×(0.9964l) -1 -p 1 ×(0.9964l) 4 -p 2 ×(0.9964l) 3 -p 3 ×(0.9964l) 2 -p 4 ×(0.9964l)-p 5 )-arctan0.0841=3.5334°.

[0138] Then, the mobile phone was placed on the body model at different placement angles for testing. Figure 8A-8D As shown, four different placement angles are exemplarily shown.

[0139] In addition, the mobile phone was placed on the head model according to the standard test method for testing.

[0140] In the actual test process, the antennas of 10 different frequency bands of the mobile phone were tested at four placement angles, namely 0 degrees, 3 degrees, 6 degrees and 9 degrees. The comparison results of the test results of the body model and the head model are shown in the following figure. Fig. 9 As shown, Fig. 9 The horizontal axis represents the frequency band of the antenna, and the vertical axis represents the SAR value. Among them, Global System for Mobile Communications (GSM) 1800, GSM900, Long Term Evolution (LTE) B1, LTE B20, LTE B28, LTE B3, LTE B7, LTE B8, Universal Mobile Telecommunications System (UMTS) B1 and UMTS B8 are antennas with 10 different frequency bands.

[0141] pass Fig. 9 It can be seen that compared with the placement angles of 0 degrees, 6 degrees and 9 degrees, when the placement angle is about 3 degrees, the head SAR obtained by using the body model test is closer to the head SAR obtained by using the head model test. Therefore, it can be considered that the angle θ=3.5334° calculated by using the angle calculation function is reasonable.

[0142] On this basis, the placement angle is fixed at 3.5° to verify the reliability of the preset head SAR limit calculated in the above embodiment.

[0143] The standard test method can be used to test the head SAR of the mobile phone in different frequency bands using a head model. The mobile phone is then placed on the body model at an angle of 3.5° and the body model is used to test the test head SAR (i.e., the substitute body SAR) in different frequency bands.

[0144] Since the standard head SAR limit is 1.6W / kg, the preset head SAR limit (i.e. the replaced body SAR limit) can be calculated as 1.067 using the following formula.

[0145]

[0146] Then, in order to verify the reliability of the preset head SAR limit, 1.067 was substituted into the inverse formula for different frequency bands to inversely deduce the head SAR limit. The inverse formula is:

[0147]

[0148] If the inferred head SAR limit is less than the standard head SAR limit of 1.6, it can be determined that the preset head SAR limit calculated in the embodiment of the present application is reliable. Taking the case of no power fluctuation as an example, the final comparison result is shown in Table 2.

[0149] Table 2

[0150]

[0151]

[0152] It can be seen from Table 2 that in each frequency band, the inferred head SAR limit is smaller than the standard head SAR limit, so the head SAR limit calculated by the embodiment of the present application is reasonable.

[0153] Thus, by using the method of the embodiment of the present application, accurate head SAR testing can be performed on a large number of devices under test without purchasing head models, which can save costs. Since the antenna position of the mobile phone is known, this method is applicable to testing mobile phones of various brands and has a wide range of applications.

[0154] Based on the introduction of the above embodiments, Fig.10 As shown, the embodiment of the present application mainly uses a body model instead of a head model, and can use a placement angle calculation model to obtain an angle calculation function in advance. The angle calculation model is used to calculate the angle between the tangent line where the mobile phone antenna is located and the surface of the head model, and the angle is used as the placement angle. And based on the SAR limit calculation model, the preset head SAR limit is obtained in advance, thereby eliminating the test error between this method and the standard test method. Then, in the actual test process, based on Figure 4 The method shown controls the robotic arm to implement an automated testing solution.

[0155] The placement angle calculation model refers to the mathematical model of the method for calculating the angle calculation function introduced in the above embodiment, and the SAR limit value calculation model refers to the mathematical model of the method for calculating the preset head SAR introduced in the above embodiment.

[0156] Fig.11 A schematic diagram of an electronic device part provided in an embodiment of the present application, the electronic device may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, a wireless communication module 150, a display screen 160, etc.

[0157] It is to be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device. In other embodiments, the electronic device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0158] The processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0159] The controller can be the nerve center and command center of the electronic device. The controller can generate operation control signals according to the instruction operation code and timing signal to complete the control of fetching and executing instructions.

[0160] The processor 110 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may store instructions or data that the processor 110 has just used or cyclically used. If the processor 110 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0161] In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an I2C interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, etc.

[0162] It is understandable that the interface connection relationship between the modules illustrated in this embodiment is only a schematic illustration and does not constitute a structural limitation of the electronic device. In other embodiments, the electronic device may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0163] The charging management module 140 is used to receive charging input from a charger. The charger can be a wireless charger or a wired charger. While the charging management module 140 charges the battery 142, it can also power the electronic device through the power management module 141.

[0164] The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and / or the charging management module 140, and provides power to the processor 110, the internal memory 121, the external memory, the display screen 160, and the wireless communication module 150. In some embodiments, the power management module 141 and the charging management module 140 can also be set in the same device.

[0165] The wireless communication module 150 can provide wireless communication solutions including WLAN (such as Wi-Fi), Bluetooth, global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR), etc., which are applied to electronic devices. The wireless communication module 150 can be one or more devices integrating at least one communication processing module. The wireless communication module 150 receives electromagnetic waves via an antenna, modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110. The wireless communication module 150 can also receive the signal to be sent from the processor 110, modulate the frequency, amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0166] The electronic device implements the display function through a GPU, a display screen 160, and an application processor. The GPU is a microprocessor for image processing, which connects the display screen 160 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

[0167] The display screen 160 is used to display images, videos, etc. The display screen 160 includes a display panel.

[0168] The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music and videos can be stored in the external memory card.

[0169] The internal memory 121 can be used to store computer executable program codes, which include instructions. The processor 110 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 121. For example, in an embodiment of the present application, the processor 110 can execute instructions stored in the internal memory 121, and the internal memory 121 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area can store data created during the use of the electronic device (such as audio data, a phone book, etc.), etc. In addition, the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (universal flash storage, UFS), etc. In a specific implementation, the present application also provides a computer storage medium, including a computer program program, wherein when the computer program runs on an electronic device, the electronic device performs some or all of the steps in the above embodiment. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0170] In a specific implementation, an embodiment of the present application further provides a computer program product, which includes a computer program code. When the computer program code runs on an electronic device, the electronic device executes some or all of the steps in the above method embodiment.

[0171] The various embodiments of the mechanism disclosed in the present application can be implemented in hardware, software, firmware or a combination of these implementation methods. The embodiments of the present application can be implemented as a computer program or program code executed on a programmable system, which includes at least one processor, a storage system (including volatile and non-volatile memory and / or storage elements), at least one input device and at least one output device.

[0172] Program code can be applied to input instructions to perform the functions described in this application and generate output information. The output information can be applied to one or more output devices in a known manner. For the purposes of this application, a processing system includes any system having a processor such as, for example, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), or a microprocessor.

[0173] Program code can be implemented with high-level programming language or object-oriented programming language to communicate with the processing system. When necessary, program code can also be implemented with assembly language or machine language. In fact, the mechanism described in this application is not limited to the scope of any specific programming language. In either case, the language can be a compiled language or an interpreted language.

[0174] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may also be implemented as instructions carried or stored on one or more temporary or non-temporary machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors. For example, instructions may be distributed over a network or by other computer-readable media. Therefore, machine-readable media may include any mechanism for storing or transmitting information in a machine (e.g., computer) readable form, including, but not limited to, floppy disks, optical disks, optical disks, compact disc read-only memories (Compact Disc Read Only Memory, CD-ROMs), magneto-optical disks, read-only memories (Read Only Memory, ROM), random access memories (RAM), erasable programmable read-only memories (Erasable Programmable Read Only Memory, EPROM), electrically erasable programmable read-only memories (Electrically Erasable Programmable Read Only Memory, EEPROM), magnetic cards or optical cards, flash memory, or a tangible machine-readable memory for transmitting information (e.g., carrier waves, infrared signal digital signals, etc.) using the Internet in electrical, optical, acoustic, or other forms of propagation signals. Accordingly, machine-readable media include any type of machine-readable media suitable for storing or transmitting electronic instructions or information in a form readable by a machine (eg, a computer).

[0175] In the accompanying drawings, some structural or method features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be required. Instead, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the accompanying drawings of the specification. In addition, the inclusion of structural or method features in a particular figure does not mean that such features are required in all embodiments, and in some embodiments, these features may not be included or may be combined with other features.

[0176] It should be noted that the units / modules mentioned in the various device embodiments of the present application are all logical units / modules. Physically, a logical unit / module can be a physical unit / module, or a part of a physical unit / module, or can be implemented as a combination of multiple physical units / modules. The physical implementation method of these logical units / modules themselves is not the most important. The combination of functions implemented by these logical units / modules is the key to solving the technical problems proposed by the present application. In addition, in order to highlight the innovative part of the present application, the above-mentioned device embodiments of the present application do not introduce units / modules that are not closely related to solving the technical problems proposed by the present application, which does not mean that there are no other units / modules in the above-mentioned device embodiments.

[0177] It should be noted that in the examples and description of this patent, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants 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, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0178] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present application.

Claims

1. A SAR testing method, characterized in that: include: Obtaining a distance value between an antenna under test of a device under test and a top of the device under test; Based on the distance value and a preset angle calculation function, calculating a placement angle of the device under test relative to the body model, wherein the placement angle is an angle between a plane of the device under test and an upper surface of the body model when a top of the device under test is in contact with the body model, and the placement angle is the same as an angle between the antenna under test and the head model when a head model is used for testing; Controlling the robotic arm to place the device to be tested on the body model according to the placement angle; Obtaining the specific absorption rate SAR obtained by the body model test as the test head SAR; Based on the test head SAR, it is determined whether the radiation of the antenna to be tested to the human head complies with the regulations.

2. The method according to claim 1, characterized in that: The determining whether the radiation of the antenna to be tested to the human head is compliant based on the test head SAR includes: determining whether the test head SAR is less than a preset head SAR limit, wherein the preset head SAR limit is obtained based on a standard head SAR limit and a test error, wherein the test error is used to represent an error generated when performing a head SAR test using the body model; If yes, it is determined that the radiation of the antenna to be tested to the human head is compliant; If not, it is determined that the radiation of the antenna to be tested to the human head is not compliant.

3. The method according to claim 2, characterized in that The preset head SAR limit is determined by the following steps: Using the body model to perform head SAR test on the experimental equipment to obtain experimental head SAR; Using the head model to perform a head SAR test on the experimental equipment to obtain a real head SAR; Taking the ratio of the experimental head SAR to the real head SAR as the test error; The preset head SAR limit is calculated based on a standard head SAR limit and the test error.

4. The method according to claim 3, characterized in that: The experimental antenna of the experimental equipment has the same frequency band as the antenna to be tested; and the calculating the preset head SAR limit value based on the standard head SAR limit value and the test error includes: The product of the standard head SAR limit value and the test error is used as the preset head SAR limit value.

5. The method according to claim 3, characterized in that: There are multiple experimental devices, and the experimental antenna of each experimental device has a different frequency band; the calculation of the preset head SAR limit value based on the standard head SAR limit value and the test error includes: For each experimental device, the product of the test error corresponding to the experimental device and the standard head SAR limit is used as a candidate head SAR limit; The smallest candidate head SAR limit value is selected from the candidate head SAR limit values ​​of each experimental device as the preset head SAR limit value.

6. The method according to any one of claims 1 to 5, characterized in that: The angle calculation function is obtained by the following steps: Establishing a rectangular coordinate system for the head model, and obtaining a tangent expression for the device under test according to the placement positions of the device under test and the head model during standard testing, wherein the tangent expression is an expression for a line connecting the ear of the outer contour of the head model and the most convex point of the face on the same side; According to the placement position, a preset number of coordinate points are sampled from the ear to the chin of the outer contour of the head model, and the sampled coordinate points are fitted into a curve expression, where the curve expression is used to represent the curve formed by the probe points of the outer contour of the head model; The angle calculation function is obtained by using the tangent expression, the curve expression and trigonometric functions.

7. The method according to claim 6, characterized in that The tangent line expression is f1(x1)=-0.0841x1+8, where x1 is the horizontal coordinate of the point on the tangent line in the rectangular coordinate system; The curve expression is: Wherein p1, p2, p3, p4, p5 and p6 are all preset polynomial coefficients, and x2 is the abscissa of the point on the curve in the rectangular coordinate system; The angle calculation function is θ=arctan((8-p6)×(0.9964l) -1 -p1×(0.9964l) 4 -p2×(0.9964l) 3 -p3×(0.9964l) 2 -p4×(0.9964l)-p5)-arctan0.0841, wherein θ is the placement angle and l is the distance value.

8. An electronic device, characterized in that: include: one or more processors and memory; The memory is coupled to the one or more processors, and the memory is used to store computer program codes, wherein the computer program codes include computer instructions, and the one or more processors call the computer instructions to enable the electronic device to perform the method as claimed in any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that: The invention comprises a computer program, which, when being executed on an electronic device, enables the electronic device to execute the method as claimed in any one of claims 1 to 7.

10. A SAR test system, characterized in that: The system comprises a device to be tested, a robotic arm, a body model, and the electronic device according to claim 8; The mechanical arm is used to place the device to be tested on the body model according to the placement angle provided by the electronic device; The body model is used to feed back the SAR obtained through testing to the electronic device.

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