CN111505395B

CN111505395B - Processing method for giving consideration to OTA and SAR tests

Info

Publication number: CN111505395B
Application number: CN202010332892.0A
Authority: CN
Inventors: 杨东; 董晓倩; 檀炜; 陈乐彬
Original assignee: Ningbo Maidu Zhilian Technology Co ltd
Current assignee: Ningbo Maidu Zhilian Technology Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2022-11-08
Anticipated expiration: 2040-04-24
Also published as: CN111505395A

Abstract

The processing method for both OTA and SAR tests provided by the invention automatically detects the test scene of the terminal through the SAR short-distance sensor and the acceleration sensor. Different test scenes are respectively set according to the capacitance value C obtained by the SAR close-range sensor and the speed delta theta and delta phi obtained by the acceleration sensor, wherein the first scene is an SAR test scene, the second scene is an OTA test scene and comprises a human head and hand test, and the other scenes are third test scenes. According to the implementation of the invention, an SAR short-distance sensor is required to be used in a main antenna area, and the SAR and OTA performance test requirements are considered in combination with an acceleration sensor used by a terminal. The invention can realize that the mobile terminal can be compatible with OTA and SAR tests, and finally meets the requirements of different markets.

Description

Processing method for giving consideration to OTA and SAR tests

Technical Field

The invention relates to the technical field of test methods, in particular to a processing method giving consideration to OTA and SAR tests.

Background

In the communication process of the mobile terminal, the antenna generates certain electromagnetic radiation, and the evaluation of the antenna performance is usually measured by two indexes of OTA and SAR.

The OTA (Over The Air) test can simulate The transmission scene of The wireless signal of The product in The Air, and The test mode can take The factors of The internal radiation interference of The product, the structure of The product, the antenna, the receiving and transmitting algorithm of The radio frequency chip, even The influence of human body and The like into consideration, so that The test method is a comprehensive test method for verifying The radiation performance of The wireless product in free space and is very close to The actual use scene of The product. If the radiation performance of the mobile phone is not good, various problems such as poor mobile phone signals, poor voice call quality, easy disconnection and the like can be caused, which is also a problem of more complaints of customers.

OTA test has different test models, and Free Space (Free Space), head mode (Head) and Head-Hand mode (Hand + Head) are common. Considering the influence of human head and hand on the antenna, the human head and hand mode test is most challenging in the OTA test process. Generally, in order to pursue the test passing rate of the OTA, a method of increasing the transmission power of the main board is adopted.

The Specific Absorption Rate (SAR) is a parameter index for determining whether electromagnetic wave radiation generated by communication equipment to a human body is safe. The smaller the SAR value is, the less the damage to human body is, and the larger the SAR value is, the unit is mw/g. At present, the SAR value has two standards of CE and FCC, wherein the standard of CE is 2mw/g, and the standard of FCC is 1.6mw/g.

The OTA performance and the actual use experience of a terminal client have a certain positive correlation, so that most domestic communication products are mainly focused on OTA testing, and much attention is paid to the OTA performance in the design process. In contrast, the communication terminal in foreign countries pays more and more attention to the SAR value, and particularly, the SAR value test standard of the communication terminal which is exported to North America needs to be met, and meanwhile, along with the fact that the requirement of the market on the radiation performance of the communication terminal is higher and higher, the SAR is more and more difficult to reduce, and the balance between the SAR and the OTA test is more and more difficult to meet.

In the actual product development process, the radiation power of the antenna is reduced through the SAR proximity sensor in the process of testing the SAR. The method can effectively reduce the SAR value, but also can reduce the radiation performance of the antenna, especially the antenna performance under the scene of human head and hand test, so that how to enable the terminal to meet both OTA and SAR test is very important.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provide a processing method compatible with OTA and SAR tests and meeting the market requirements.

In order to achieve the above object, the processing method for considering both OTA and SAR testing provided by the present invention includes an SAR proximity sensor disposed on the left side of a main antenna region at the bottom of a rear end face of a mobile terminal and an acceleration sensor disposed in the rear end face of the mobile terminal and configured to sense a speed of the mobile terminal, and specifically includes the following steps:

s1: obtaining the distance from the SAR proximity sensor to the human body and converting the distance into a capacitance value C _{Real time} (ii) a Acquiring the moving speed of the mobile terminal according to the acceleration sensor, and converting the moving speed into values of speed delta theta and speed delta phi;

s2: according to the capacitance C generated by the mobile terminal in the test process _Real-time Values of speed delta theta and delta phiThree test scenarios are defined: the first scenario is an SAR test scenario, the second scenario is an OTA test scenario and comprises a human head and hand test, and the other scenarios are third test scenarios; predefining: Δ θ =0 and Δ φ =0 and C in the first scenario _{Real time} = C1; delta theta in the second scenario>0 and delta phi>0 and C _{Real time} = C2 or Δ θ>0 and delta phi>0 and C _{Real time} =0; a third scenario: all other conditions except the second scene and the first scene are a third scene;

s3: according to three preset scenes, a group of maximum power tables are correspondingly set in advance: the antenna SAR test environment of the first scene corresponds to a first Table of power, namely Table1, the OTA test environment of the second scene corresponds to a second Table of power, namely Table2, and other scenes correspond to a third Table of normal power, namely Table 3;

s4: obtaining a real-time monitored capacitance value C _{Real time} The speed delta theta and the speed delta phi are calculated, and then the scene where the mobile terminal is located at present is judged;

s5: and calling the corresponding power requirement in the step S3 according to the scene, and then adjusting the power to the power required by the mobile terminal according to the power requirement.

The circuit design comprises that a channel CS0 of the SAR proximity sensor is connected with a main antenna feed point of the mobile terminal through a group of matching circuits, two channels CS1 and CS2 of the SAR proximity sensor are suspended and are not used, the SAR proximity sensor is connected and communicated with a CPU of the mobile terminal through an I2C interface (SCL, SDA), and an NIRQ pin of the SAR proximity sensor is connected with an interrupt port of the CPU of the mobile terminal.

After the circuit is completed, in step S5: the specific steps of calling the corresponding power requirement in step S3 according to the located scene, and then adjusting the power to the power required by the corresponding terminal according to the power requirement are as follows:

s-1, in the testing process, when a human body is close to a main antenna of a mobile terminal, an SAR (synthetic aperture radar) proximity sensor senses a real-time specific load capacitor C1, at the moment, delta theta and delta phi sensed by an acceleration sensor are zero, then the current state is judged to be a first scene, then a corresponding first event is triggered according to the interruption generated by the SAR proximity sensor and the acceleration sensor, and namely the mobile terminal calls a corresponding first power table;

s-2, when hands and heads of people are simulated to be close to the main antenna of the mobile terminal in the test process, the SAR close range sensor can sense a real-time specific load capacitor C2, and the acceleration sensor senses delta theta>0 and

and C _{Real time} = C2 or Δ θ>0 and

and C _{Real time} =0, then judging that the current state is the antenna OTA test environment is the second scene, and at this time, triggering a corresponding second event according to the interruption generated by the SAR proximity sensor and the acceleration sensor, namely, calling a corresponding second power table by the mobile terminal;

s-3, in the testing process, the SAR close range sensor senses other load capacitance or zero, the speed sensed by the acceleration sensor is other value or zero, then the current state is judged to be other scene, at the moment, according to the interruption generated by the SAR close range sensor and the acceleration sensor, a corresponding third event is triggered or no trigger is generated, namely the mobile terminal calls the content of a corresponding normal power third table.

The processing method for giving consideration to OTA and SAR tests, which is disclosed by the invention, realizes that the mobile terminal can be compatible with tests of OTA and SAR tests, and finally meets the requirements of different markets.

Drawings

Fig. 1 is a schematic structural view of a rear end face of a mobile terminal in embodiment 1;

fig. 2 is an application circuit diagram of the SAR proximity sensor in embodiment 1;

FIG. 3 is a schematic diagram of a test structure of a first scenario in embodiment 1;

FIG. 4 is a schematic diagram showing a test structure of a second scenario in embodiment 1;

fig. 5 is a perspective view of the structure of the simulated human head of fig. 4 for holding the mobile terminal, simulating the function of holding the mobile terminal.

In the figure: the system comprises a mobile terminal 1, an SAR (synthetic aperture radar) proximity sensor 2, an acceleration sensor 3, a matching circuit 4 and a CPU 5.

Detailed Description

In order to more clearly understand the technical scheme of the invention, the invention is further illustrated by the following embodiments in combination with the accompanying drawings.

Example 1:

as shown in fig. 1, the processing method for considering both OTA and SAR testing provided in this embodiment includes an SAR proximity sensor 2 disposed on the left side of a main antenna area at the bottom of a rear end face of a mobile terminal 1 and an acceleration sensor 3 disposed in the rear end face of the mobile terminal 1 and configured to sense a speed of the mobile terminal 1, and specifically includes the following steps:

s1: obtaining the distance from the human body according to the SAR proximity sensor 2 and converting the distance into a capacitance value C _{Real time} (ii) a Acquiring the moving speed of the mobile terminal 1 according to the acceleration sensor 3, and converting the moving speed into values of speed delta theta and speed delta phi;

s2: according to the capacitance C generated by the mobile terminal 1 in the test process _{Real time} The values of speed Δ θ and Δ φ define three test scenarios: the first scenario is an SAR test scenario, the second scenario is an OTA test scenario and comprises a human head and hand test, and the other scenarios are third test scenarios; predefining: Δ θ =0 and Δ Φ =0 and C in the first scene _{Real time} = C1; Δ θ in the second scenario>0 and delta phi>0 and C _{Real time} = C2 or Δ θ>0 and Δ φ>0 and C _{Real time} =0; a third scenario: all other conditions except the second scene and the first scene are a third scene;

s4: obtaining a real-time monitored capacitance value C _{Real time} Speed delta theta and delta phi, and then determining the field in which the mobile terminal 1 is currently locatedA scene;

s5: and calling the corresponding power requirement in the step S3 according to the located scene, and then adjusting the power to the power required by the mobile terminal 1 according to the power requirement.

The circuit design comprises that a channel CS0 of an SAR proximity sensor 2 is connected with a main antenna feed point of a mobile terminal 1 through a group of matching circuits 4, two channels CS1 and CS2 of the SAR proximity sensor 2 are suspended and not used, the SAR proximity sensor 2 is connected and communicated with a CPU5 of the mobile terminal 1 through an I2C interface (SCL, SDA), and an NIRQ pin of the SAR proximity sensor 2 is connected with a break port of the CPU5 of the mobile terminal 1.

s-1, in the testing process, when a human body approaches to a main antenna of a mobile terminal 1, an SAR (synthetic aperture radar) proximity sensor 2 senses a real-time specific load capacitor C1, at the moment, delta theta and delta phi sensed by an acceleration sensor 3 are zero, then the current state is judged to be a first scene, and then a corresponding first event is triggered according to interruption generated by the SAR proximity sensor 2 and the acceleration sensor 3, namely the mobile terminal 1 calls a corresponding first power table;

s-2, when hands and heads of people are simulated to be close to the main antenna of the mobile terminal 1 in the test process, the SAR close range sensor 2 senses a real-time specific load capacitor C2, and the acceleration sensor 3 senses delta theta>0 and

and C is _{Real time} = C2 or Δ θ>0 and

and C is _{Real time} =0, then judging that the current state is the antenna OTA test environment is a second scene, and triggering a corresponding second event according to the interruption generated by the SAR close-range sensor 2 and the acceleration sensor 3 at the moment, namely calling a corresponding power second table by the mobile terminal 1;

and S-3, in the testing process, the SAR short-distance sensor 2 senses other load capacitance or zero, the speed sensed by the acceleration sensor 3 is other value or zero, then the current state is judged to be other scene, at the moment, a corresponding third event is triggered or no trigger is generated according to the interruption generated by the SAR short-distance sensor 2 and the acceleration sensor 3, namely, the mobile terminal 1 calls the content of a corresponding normal power third table.

Therefore, by the processing method, the mobile terminal can be compatible with OTA and SAR tests, and the requirements of different markets are met finally.

As shown in fig. 1, an acceleration sensor 3 is disposed at the middle position of the mobile terminal 1, and senses the speed change and converts the speed change into an electric signal, so as to trigger a corresponding interrupt and generate a corresponding interrupt event; because the mobile terminal 1 comprises the diversity antenna 1-1, the GPS/WIFI antenna 1-2 and the main set antenna 1-3, the SAR close range sensor 2 is arranged in the area of the main set antenna 1-3 in the embodiment of the invention, and corresponding interruption is triggered by utilizing the mode of converting the sensed load capacitance into an electric signal so as to generate a corresponding interruption event;

as shown in fig. 2, an application circuit diagram of an SAR proximity sensor 2 is shown, in this embodiment, a chip with a model of SX9325 is adopted, one path of CS0 is directly connected to a feed point of a main set antenna 1-3, and a group of impedance matching circuits is reserved to reduce the influence of the CS0 path on the performance of the main set antenna 1-3, two paths of CS1 and CS2 are suspended and not used, and communicate with a CPU through an I2C interface (SCL, SDA), and an NIRQ is connected to a fracture in the CPU.

According to the combined state of the SAR proximity sensor 2 and the acceleration sensor 3, a group of maximum power tables are preset in an NVRAM (main controller) of the mobile terminal 1, a first scene is formed, the antenna SAR test environment corresponds to the power Table1 (Table 1), a second scene is formed, the OTA test environment corresponds to the power Table2 (Table 2), and other scenes correspond to the normal power Table3 (Table 3);

as shown in fig. 3, which is a schematic view of a test structure of a first scenario-antenna SAR test environment, when a human body approaches a main antenna, an SAR proximity sensor senses a specific load capacitance C1, and Δ θ and Δ Φ sensed by an acceleration sensor are zero. Triggering a corresponding event 1 according to interrupts generated by the SAR proximity sensor and the acceleration sensor, the terminal calls a corresponding power Table1 (Table 1), 11 in fig. 3 is a computer for acquiring data and performing calculation analysis, 22 is a data acquisition unit for acquiring data, 33 is an electromagnetic field probe, 44 is a probe positioning mechanical arm for positioning the electric field probe, 55 is a measurement environment field, 66 is a human body model for containing simulation liquid, 77 is a tested mobile terminal 1, 88 is a clamp for fixing the tested mobile terminal 1, and fig. 3 is a circuit connected in a conventional test scenario for testing the SAR test environment, so that detailed description is not given.

As shown in fig. 4, which is a schematic diagram of a test structure of a second scenario-antenna OTA test environment, by simulating a hand and a head of a person, when the hand and the head of the person are close to a main antenna, an SAR proximity sensor senses a specific load capacitance C2, and an acceleration sensor senses Δ θ>0 and

triggering a corresponding event 2 according to the interruption generated by the SAR proximity sensor and the acceleration sensor, and calling a corresponding power Table2 (Table 2) by the terminal;

in other scenarios, the SAR proximity sensor may sense another load capacitance or zero, and the acceleration sensor may sense another value or zero of the velocity. Triggering a corresponding event 3 according to the interruption generated by the SAR proximity sensor and the acceleration sensor, or calling a corresponding normal power Table3 (Table 3) by the terminal without any trigger.

In the present embodiment, in the power table setting of the actual item, the following problems are generally considered:

1. the GSM900 band is set to a relatively high power, so the Sar test value is usually high, and the OTA test value is low, so different powers need to be set for the GSM900 band.

2. The frequency of the LTE Band7 frequency Band is higher, and the radiation efficiency is higher, so the Sar test value is usually higher; therefore, table1, table2 and Table3 are designed as shown in Table1 in a specific project;

table 1:

	Table 1	Table 2	Table 3
				GSM900	30dbm	33dbm	31.5dBm
LTE Band7	20dBm	23dBm	21.5dBm

in addition, table1 is only a specific requirement, the actual range needs to be determined according to the actual requirement, the frequency bands set according to the requirement are different, the power design value also needs to be adjusted according to the actual test condition, and such adjustment belongs to the conventional technology in the art, so that no specific description is made.

In addition, the invention can automatically call a corresponding preset power table according to the states of the SAR near-distance sensor and the acceleration sensor to adjust the power of the equipment, so that the equipment can meet the final SAR and OTA performance test requirements and give consideration to the SAR and OTA performance tests.

Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A processing method giving consideration to OTA and SAR tests comprises an SAR proximity sensor (2) arranged on the left side of a main antenna area at the bottom of the rear end face of a mobile terminal (1) and an acceleration sensor (3) arranged in the rear end face of the mobile terminal (1) and used for sensing the speed of the mobile terminal (1), and specifically comprises the following steps:

s1: obtaining the distance from the human body according to the SAR proximity sensor (2) and converting the distance into a capacitance value C _{Real time} (ii) a Acquiring the moving speed of the mobile terminal (1) according to the acceleration sensor (3), and converting the moving speed into values of speed delta theta and speed delta phi;

s2: according to the capacitance value C generated by the mobile terminal (1) in the test process _{Real time} The values of speed Δ θ and Δ φ define three test scenarios: the first scenario is an SAR test scenario, the second scenario is an OTA test scenario and comprises a human head and hand test, and the other scenarios are third test scenarios; predefining: Δ θ =0 and Δ Φ =0 and C in the first scene _{Real time} = C1; delta theta in the second scenario>0 and delta phi>0 and C _{Real time} = C2 or Δ θ>0 and delta phi>0 and C _{Real time} =0; a third scenario: all other conditions except the second scene and the first scene are a third scene;

s3: three scenes are preset, and a group of maximum power tables are correspondingly set: the antenna SAR test environment of the first scene corresponds to a first Table of power, namely Table1, the OTA test environment of the second scene corresponds to a second Table of power, namely Table2, and other scenes correspond to a third Table of normal power, namely Table 3;

s4: obtaining a real-time monitored capacitance value C _{Real time} The speed delta theta and the speed delta phi are calculated, and then the scene where the mobile terminal (1) is located at present is judged;

s5: and calling the corresponding power requirement in the step S3 according to the scene, and then adjusting the power to the power required by the mobile terminal (1) according to the power requirement.

2. The processing method for both OTA and SAR testing according to claim 1, wherein: the channel CS0 of the SAR proximity sensor (2) is connected with a main antenna feed point of the mobile terminal (1) through a group of matching circuits (4), two paths of the CS1 and the CS2 of the SAR proximity sensor (2) are suspended and are not used, the SAR proximity sensor (2) is connected and communicated with a CPU (5) of the mobile terminal (1) through an I2C interface (SCL, SDA), and an NIRQ pin of the SAR proximity sensor (2) is connected with an interrupt port of the CPU (5) of the mobile terminal (1).

3. The processing method for enabling both OTA and SAR testing as claimed in claim 1, wherein: in step S5, the specific steps of calling the corresponding power requirement in step S3 according to the located scene, and then adjusting the power to the power required by the corresponding terminal according to the power requirement are as follows:

s-1, in the testing process, when a human body is close to a main antenna of a mobile terminal (1), an SAR (synthetic aperture radar) proximity sensor (2) senses a real-time specific load capacitance C1, at the moment, delta theta and delta phi sensed by an acceleration sensor (3) are zero, then the current state is judged to be a first scene, then a corresponding first event is triggered according to the interruption generated by the SAR proximity sensor (2) and the acceleration sensor (3), and namely the mobile terminal (1) calls a corresponding first power table;

s-2, when hands and heads of people are simulated to be close to the main antenna of the mobile terminal (1) in the test process, the SAR close range sensor (2) can sense a real-time specific load capacitor C2, and the acceleration sensor (3) senses delta theta>0 and delta phi>0 and C _Real-time = C2 or Δ θ>0 and delta phi>0 and C _{Real time} =0, then judging that the current state is the second scene of the antenna OTA test environment, and triggering a corresponding second event according to the interrupts generated by the SAR proximity sensor (2) and the acceleration sensor (3), namely, the mobile terminal (1) calls a corresponding second power table;

s-3, in the testing process, the SAR close range sensor (2) can sense other load capacitance or zero, the speed sensed by the acceleration sensor (3) is other value or zero, then the current state is judged to be other scenes, at the moment, a corresponding third event is triggered or no trigger is generated according to the interruption generated by the SAR close range sensor (2) and the acceleration sensor (3), and namely the mobile terminal (1) calls the content of a corresponding normal power third table.