CN102571235A - Asynchronous measuring method for total radiated power (TRP) of mobile phone - Google Patents

Abstract

The invention relates to an asynchronous measuring method for total radiated power (TRP) of a mobile phone, which belongs to the technical field of radio-frequency testing of wireless communication products. The method comprises the following steps of: firstly, arranging and asynchronously rotating three-groups of metal reflectors in a shielded chamber made of a high-conductivity metal to form an over-mode resonant working state; secondly, acquiring a conversion factor which corresponds each test frequency by calibrating; thirdly, simulating connection establishment between a base station and a mobile phone to be tested by using an integrated tester, setting a test frequency and putting the mobile phone in a maximum power transmitting state; fourthly, asynchronously driving the reflector to rotate by using an asynchronous motor, and recording receiving power of the reflector at each position to form a test result sequence; and lastly, selecting a medium value in the test result sequence, and converting in combination with a calibrating factor to obtain the TRP of the mobile phone. The measuring method provided by the invention can be used for accurately measuring the TRP of the mobile phone, and has the advantages of low cost, small floor area, easiness for maintaining, and the like.

Description

The asynchronous measurement method of the isotropically radiated power of mobile phone

Technical field

The present invention provides a kind of asynchronous measurement method of isotropically radiated power of mobile phone, belongs to the radio frequency testing technical field of wireless communications products.

Background technology

Corresponding with conduction test, OTA-Over The Air (airborne performance test) is that a kind of space three-dimensional to the radiation of equipment performance is measured, and its purpose is exactly the influence to radiation and receptivity of concatenation ability and the terminal user of checking wireless device and network.Wherein, be measurement travelling carriage three dimensions RF radiation power, the spherical effective isotropic radiated power of specifying measurement travelling carriage, the abbreviation total radiant power (Total Radiated Power, TRP).

Standard (YD/T1484-2006; CTIA:Test Plan for Mobile Station OTA Performance Revision_2_2_2_Final 121808) comprises dual mode in the OTA TRP testing scheme that provides, i.e. circular cone cutting method (distribution axle system) and great circle cutting method (built-up shaft system).As far as great circle cutting method scheme, the EUT navigation system of its relative complex can be accomplished the function around Phi axle and the rotation of Theta axle with EUT, therefore only needs to adopt single antenna just can accomplish the test of TRP; As far as circular cone cutting method scheme; Its simple relatively EUT navigation system only can be accomplished the function around the rotation of Phi axle with EUT; Therefore need on the Theta direction, to arrange in addition that rotatable reception antenna (single antenna scheme) measures successively, arrange that perhaps a plurality of test antennas form arrays (many antenna scheme) and measure simultaneously.

Above-mentioned which kind of mode no matter, they all need be measured in an approximate unreflected fully anechoic chamber, brought such as absorbing material selection, layout thus, laid a series of problems such as fixing and maintaining.In addition, for realizing the radiant power measurement on the three-dimensional sphere, existing metering system all needs the mechanical turntable of a precision, also can bring the problem such as aspects such as position error, machining accuracies thus.At last,, all can cause extra funds to increase no matter be fully anechoic chamber or precision optical machinery turntable, thus indirect raising testing expense.

Multimode cavity is as the concrete application of waveguide resonant theory in the microwave technical field; Its essence is that is crossed a mode resonant cavity; Promptly through in the metallic cavity of high conductivity, exciting abundant eigenmodes, set up a kind of space evenly, the electromagnetic environment (statistics uniform field) of isotropism, random polarization.Based on the above-mentioned characteristic of crossing mode resonant cavity, we can utilize it to carry out radiation immunity test, radiation emission test, screening effectiveness test and antenna efficiency test or the like.Compare with traditional test site, cross mode resonant cavity cost, Measuring Time, effectively analog composite field etc. many aspect advantage outstanding.For example: cover absorbing material in need not in the mode resonant cavity excessively, the Q value of cavity resonance is very high, therefore can use less relatively power, obtains bigger field intensity and higher dynamic range.

For the cuboid resonant cavity that a length is respectively a, b, c, it can be counted as the rectangular waveguide of two terminal shortcircuits.Utilize the correlation theory of electromagnetic wave propagation in the waveguide, each eigenmodes (resonance) frequency that can calculate in this resonant cavity is following:

$f_{\mathrm{mnp}}=\frac{1}{2\sqrt{\mathrm{\μ\ϵ}}}\sqrt{{\left(\frac{m}{a}\right)}^2+{\left(\frac{n}{b}\right)}^2+{\left(\frac{p}{c}\right)}^2}$

Wherein, the unit of parameter a, b, c is a rice, and m, n, p are natural number.The concrete value of every group of m, n, p all corresponding a concrete intrinsic (resonance) pattern, the electromagnetic field under every kind of pattern distributes and all confirms and have nothing in common with each other.In addition, because m, n, p must get natural number, so above-mentioned eigenmodes frequency is discontinuous, promptly eigenmodes (resonance) frequency of electromagnetic field can only be got a series of specific, discontinuous numerical value in the resonant cavity.

As far as common single mode resonant cavity, we make and have only unique a kind of pattern existence in the resonant cavity that at this moment, its field distribution is confirmed through the frequency of control driving source; If but brought up to the intensive interval of pattern to the operating frequency band, then not only there is a kind of pattern in the resonant cavity this moment, i.e. multimode cavity.When the mode of operation quantity in the multimode cavity was abundant, resonant cavity will be in a kind of state of crossing mould resonance, and its inner field distribution is the stack that a lot of mode fields distribute; If can effectively change the composition situation of many patterns of participating in additive process through certain mode, field distribution also marked change will occur so.Form, constantly change the field distribution in the cavity through continuous adjustment modes, finally can in cavity, form the space evenly, the electromagnetic environment of isotropism, random polarization, promptly add up uniform field.

Utilized mode resonant cavity to cross the work characteristics and the uniform field distribution of statistics of mould resonance, we select to detect the measurement result of a point, reflect whole field distribution situation through its statistics.The method of utilizing mode resonant cavity to measure the wireless terminal total radiant power just stems from this.

As stated, the key of utilizing mode resonant cavity to measure this new method of wireless terminal total radiant power is exactly to find a kind of simple and effective way significantly to change the composition situation of many patterns of participating in additive process.Most common form is exactly in the metal of high Q value is crossed the mode resonant cavity body, to place and rotoflector at present.In addition, realized through the position that changes the source that mode resonant cavity also was fine, yet do not provide a kind of system of how in crossing mode resonant cavity, measuring the isotropically radiated power of mobile phone in the existing technology.

Summary of the invention

For overcoming deficiency of the prior art, goal of the invention of the present invention provides a kind of asynchronous measurement method of isotropically radiated power (TRP) of mobile phone, utilizes method of measurement provided by the invention can measure the isotropically radiated power (TRP) of mobile phone exactly.

For realizing said goal of the invention, the invention provides a kind of isotropically radiated power asynchronous measurement method of mobile phone, it comprises the steps:

The first step: transmitting antenna 4 was arranged in the mode resonant cavity, and to make transmitting antenna 4 transmitting powers be P _InFrequency is f _jSignal; Wherein, cross mode resonant cavity and comprise shielded enclosure 17, be arranged on first group of chaff 11 of shielded enclosure 17 left and right directions; Be arranged on second group of chaff 10 of shielded enclosure 17 fore-and-aft directions, and the 3rd group of chaff 9 that is arranged on shielded enclosure 17 above-below directions;

Second step: first group of chaff 11, second group of chaff 10 and the 3rd group of chaff are rotated N time respectively, and the record reflector is when each position, and the sequence of the power of the signal that reception antenna reception transmitting antenna 4 is launched is P _R0, P _{R 1}... and P _{R (3N-1)}, wherein, reception antenna and transmitting antenna are separately positioned on the 3rd group of chaff both sides;

The 3rd step: go out conversion factor F according to computes _j:

F _j＝P _in/Medium(P _r0，P _r1，...，P _r(3N-1))；

The 4th step: transmitting antenna 4 is shifted out from crossing in the mode resonant cavity, mobile phone to be measured is arranged on the position of transmitting antenna 4, and the operating frequency of mobile phone is adjusted to f _j, power setting is to maximum;

The 5th step: rotate first, second and the 3rd group of chaff respectively, the record reflector is when each position, and the power sequence that reception antenna receives the signal that mobile phone to be measured launches is P ' _R0, P ' _R1... and P ' _{R (3N-1)}

The 6th step: according to the isotropically radiated power TRP of computes mobile phone to be measured _j:

TRP _j＝Medium(P′ _r0，P′ _r1，...，P′ _r(3N-1))/F _j。

The asynchronous measurement method of utilizing the present invention to propose can accurately be measured the isotropically radiated power of mobile phone, and it is low to have expense, takes up an area of for a short time, safeguards advantages such as simple.

Description of drawings

Fig. 1 is the block diagram of asynchronous measurement equipment of the isotropically radiated power of mobile phone provided by the invention;

Fig. 2 is a sketch map of crossing mode resonant cavity provided by the invention;

Fig. 3 is that the forward from first provided by the invention is had an X-rayed the composition diagram of first group of chaff;

Fig. 4 is that the forward from second provided by the invention is had an X-rayed the composition diagram of second group of chaff;

Fig. 5 is that the forward from the 3rd provided by the invention is had an X-rayed the composition diagram of the 3rd chaff;

Fig. 6 is the flow chart of calibration process of asynchronous measurement of the isotropically radiated power of mobile phone of the present invention;

Fig. 7 is the flow chart of measuring process of asynchronous measurement of the isotropically radiated power of mobile phone of the present invention.

Embodiment

Specify the present invention below in conjunction with additional accompanying drawing.In the accompanying drawing, identical Reference numeral is represented parts in opposite directions.

Fig. 1 is the block diagram of asynchronous measurement equipment of the isotropically radiated power of mobile phone provided by the invention.As shown in Figure 1, the isotropically radiated power asynchronous measurement equipment of mobile phone provided by the invention comprises: pc machine 1; Shielded enclosure 17; First group of chaff 11, it is arranged on shielded enclosure 17 left and right directions; Second group of chaff 10, it is arranged on shielded enclosure 17 fore-and-aft directions; The 3rd group of chaff 9, it is arranged on shielded enclosure 17 above-below directions; First stepping motor 8, it is through first group of chaff of belt drives, 11 rotations; Second stepping motor 7, it is through second group of chaff of belt drives, 10 rotations; The 3rd stepping motor 6, it is through the 3rd group of chaff of belt drives 9 rotations; Stepping motor nonsynchronous controller 5, the asynchronous driving of its timesharing under the control of PC first stepping motor 8, second stepping motor 7 or the 3rd stepping motor 6; Gating switch 22, its strobe pulse of sending here according to PC link to each other controllor for step-by-step motor respectively with first stepping motor 8, second stepping motor 7 or the 3rd stepping motor 6; Signal source 2, during calibration, its under the control of PC, produce one need calibration frequency signal; Power amplifier 3, during calibration, the signal that its amplifying signal source 2 produces, and be amplified to the power P that PC sets _InReception antenna 12, it is arranged in the shielded enclosure 17, during calibration, receives the electromagnetic signal of 4 radiation of transmitting antenna and converts the signal of telecommunication to, and during measurement, it receives electromagnetic signal and switching electrical signals that mobile phone to be measured is launched; Electrical to optical converter 13, it is arranged in the shielded enclosure 17, and the electrical signal conversion that reception antenna 12 is received becomes light signal, and this light signal arrives PC through Optical Fiber Transmission; Optical fiber receiving card 14 is responsible for reading light signal, and it is scaled to leave in after the performance number supplies PC to read in the fixing memory cell; Wireless comprehensive test instrument 15; The function of its anolog base station under the control of PC and mobile phone to be measured connect; Can directly set the test frequency of mobile phone to be measured and the transmitting power of mobile phone is adjusted to maximum and display 18 through this connection PC, it is used to show test results.PC is connected through gpib bus realization and equipment such as comprehensive test instrument, signal source, power amplifier, stepping motor nonsynchronous controller.

Fig. 2 is a sketch map of crossing mode resonant cavity provided by the invention.As shown in Figure 2, shielded enclosure 17 is a cuboid, and the equal high conductivity metal plate of its six faces (for example: galvanized steel plain sheet) process, be provided with opening 20 in its front.Mobile phone to be measured dependence test article such as (perhaps standard dipole antennas) are through this shield door turnover shielded enclosure.The shielded enclosure side is provided with the Signals Transfer Board 21 of current supply cable and optical fiber turnover shielded enclosure.

First group of chaff 11 comprise first spool identical with shielded enclosure length and evenly be arranged on d blade on first, and second group of chaff 10 comprises second and evenly be arranged on h blade on second.The 3rd group of chaff 9 comprise the 3rd be arranged on g blade on the 3rd.Said blade is that the length of side is the square aluminium flake of L.First can be placed on the support, also can be arranged on the Zuo Bi and right wall of shielded enclosure.On the front face and rear wall that second is arranged on shielded enclosure.On the end face and bottom surface that the 3rd is arranged on shielded enclosure.

Fig. 3 is that the forward from first provided by the invention is had an X-rayed the composition diagram of first group of chaff.。The formation of first group of chaff provided by the invention is described in conjunction with Fig. 3.If shielded enclosure 17 is right-hand to the positive direction that is axle, then left is to the negative direction that be axle, and then first group of chaff is to form like this: the blade that d length of side is L is divided into identical d+1 interval with first equally spacedly; The 1st blade d in d blade ₁Be arranged on first the 1st position, blade d ₁With the angle of first positive direction be 45 degree; The 2nd blade d in d blade ₂Be arranged on first the 2nd position, and around first along clockwise direction with respect to the 1st blade d ₁The 3rd blade d in the rotation 360/d degree, d blade ₃Be arranged on first the 3rd position, around first along clockwise direction with respect to the 2nd blade d ₂Rotation 360/d degree, and the like, d blade d in d blade _dBe arranged on first d position, around first along clockwise direction with respect to d-1 blade d _D-1Rotation 360/d degree. Preferred first length equals the length about shielded enclosure among the present invention, all is made as 4m, and blade quantity d is 5, i.e. blade d ₁, d ₂, d ₃, d ₄And d ₅, then 5 blades are divided into 6 equal intervals with first.

Fig. 4 is the composition diagram that the forward from second provided by the invention is had an X-rayed group of two chaff.The formation of second group of chaff provided by the invention is described in conjunction with Fig. 4.If the rear of shielded enclosure 17 is to the positive direction that is axle, then the place ahead is to the negative direction that be axle, and then second group of chaff is to form like this: the blade that h length of side is L is divided into identical h+1 interval with second equally spacedly; The 1st blade h in h blade ₁Be arranged on second the 1st position, blade h ₁With the angle of second positive direction be 45 degree; The 2nd blade h in h blade ₂Be arranged on second the 2nd position, and around second along clockwise direction with respect to the 1st blade h ₁Rotation 360/h degree; The 3rd blade h in h blade ₃Be arranged on first the 3rd position, around second along clockwise direction with respect to the 2nd blade h ₂Rotation 360/h degree, and the like, h blade h in h blade _hBe arranged on second h position, around second along clockwise direction with respect to h-1 blade h _H-1Rotation 360/h degree.Preferred second length equals the length of shielded enclosure front and back among the present invention, all is made as 3m, and blade quantity h is 4, i.e. blade h ₁, h ₂, h ₃And h ₄, then 4 blades are divided into 5 equal intervals with first.

Fig. 5 is the composition diagram that the forward from the 3rd provided by the invention is had an X-rayed group of three chaff.The formation of the 3rd group of chaff provided by the invention is described in conjunction with Fig. 5.If the top of shielded enclosure 17 is the 3rd positive direction, then the below is the 3rd a negative direction, and then the 3rd group of chaff is to form like this: the blade that g length of side is L is divided into identical g+1 interval with the 3rd equally spacedly; The 1st blade g in g blade ₁Be arranged on the 3rd the 1st position, blade g ₁With the angle of the 3rd positive direction be 45 degree; The 2nd blade g in g blade ₂Be arranged on the 3rd the 2nd position, and around the 3rd along clockwise direction with respect to the 1st blade g ₁Rotation 360/g degree; The 3rd blade g in g blade ₃Be arranged on the 3rd the 3rd position, around the 3rd along clockwise direction with respect to the 2nd blade g ₂Rotation 360/g degree, and the like, g blade g in g blade _gBe arranged on the 3rd g position, around the 3rd along clockwise direction with respect to g-1 blade g _G-1Rotation 360/g degree.Preferred the 3rd length equals shielded enclosure height up and down among the present invention, all is made as 2.5m, and blade quantity g is 3, i.e. blade g ₁, g ₂And g ₃, then 3 blades are divided into 4 equal intervals with the 3rd.

Fig. 6 is the flow chart of calibration process of asynchronous measurement of the isotropically radiated power of mobile phone of the present invention.Said calibration steps comprises:

Step 101: make first stepping motor 8, second stepping motor 7, the 3rd stepping motor 6, signal source 2 and power amplifier 3 initialization through PC;

Step 102: through the frequency f in PC signalization source 2 _jPower P with power amplifier _In, this frequency f _jThe frequency that promptly need calibrate, its test frequency with mobile phone to be measured is identical;

Step 103: the signal that signal source 2 is produced amplifies after standard dipole antenna 4 is launched through power amplifier;

Step 104: the number of times of setting first, second and the 3rd rotation through PC is N, and three number of revolutions are corresponding with measuring number of times, and measurements number of times is 3N, and N selects and is greater than or equal to 33 natural number among the present invention;

Step 105: the initial value i=0 that sets first, second and the number of times of the 3rd rotation;

Step 106: the power P of the signal that measurement isotropic receiving antenna 12 acceptance criteria dipole antennas 4 are launched _RiAnd with this power P _RiStore a memory block of PC into.Isotropic receiving antenna 12 (omnidirectional's three-dimensional probe), electrical to optical converter 13 and PC constitute the power receiving system.

Step 107:PC machine is exported a control signal; Make stepping motor nonsynchronous controller 5 produce a strobe pulse; This strobe pulse is connected the moving point of gating switch 22 and first stepping motor; The second and the 3rd stepping motor breaks off, make first stepping motor 8 along direction between up time (along counterclockwise also can) degree that rotates

;

Step 108: the number of times i=i+1 that sets first rotation;

Step 109: judge,, otherwise turn back to step 106 if number of times i=N then carry out step 110;

Step 110: the power P of the signal that measurement isotropic receiving antenna 12 acceptance criteria dipole antennas 4 are launched _RiAnd with this power P _RiStore a memory block of PC into.

Step 111:PC machine is exported a control signal; Make stepping motor nonsynchronous controller 5 produce a strobe pulse; This strobe pulse is connected the moving point of gating switch 22 and second stepping motor; The first and the 3rd stepping motor breaks off, make second stepping motor 7 along direction between up time (along counterclockwise also can) degree that rotates

;

Step 112: the number of times i=i+1 that sets second rotation;

Step 113: judge,, otherwise turn back to step 110 if number of times i=2N then carry out step 114;

Step 114: the power P of the signal that measurement isotropic receiving antenna 12 acceptance criteria dipole antennas 4 are launched _RiAnd with this power P _RiStore a memory block of PC into.

Step 115:PC machine is exported a control signal; Make stepping motor nonsynchronous controller 5 produce a strobe pulse; This strobe pulse is connected the moving point of gating switch 22 and the 3rd stepping motor; First and second stepping motors break off, make the 3rd stepping motor 6 along direction between up time (along counterclockwise also can) degree that rotates ;

Step 116: the number of times i=i+1 that sets the 3rd rotation;

Step 117: judge,, otherwise turn back to step 114 if number of times i=3N then carry out step 118

Step 118: from the memory block, transfer all and measure power P _R0, P _{Re 1}..., P _{R (3N-1)}

The intermediate value of getting them is P _Jm, that is:

P _jm＝Medium(P _r0，P _r1，...，P _r(3N-1))；

Step 119: calculated rate f _jCalibration conversion factor F _j, that is: F _j=P _In/ P _Jm, and this value outputed in the look-up table that PC is provided with the theing contents are as follows of look-up table:

Calibration frequency	f 1	...	f j	...	f M
						The calibration conversion factor	F 1	...	F j	...	F M

M representes the number of the frequency of needs calibration, 1≤j≤M in the table.

Step 120: judge that the frequency of calibration has all drawn conversion factor if desired, then carry out step 121, otherwise, change frequency, turn back to step 102;

Step 121: calibration finishes.

Fig. 7 is the flow chart of measuring process of asynchronous measurement of the isotropically radiated power of mobile phone of the present invention.During measurement, standard dipole antenna (transmitting antenna) is shifted out in shielded enclosure, mobile phone is arranged on standard dipole antenna place.As shown in Figure 7.The asynchronous measurement method of the isotropically radiated power of mobile phone provided by the present invention comprises the steps:

Step 201: make first stepping motor 8, second stepping motor 7, the 3rd stepping motor 6, comprehensive test instrument 15 and mobile phone to be measured 16 initialization through PC;

Step 202: the tranmitting frequency f that mobile phone to be measured is set through PC _j, and make the mobile phone transmitting power be set to maximum;

Step 203: mobile phone 16 is transmitted;

Step 204: through PC the measurement number of times is set and also is N;

Step 205: the initial value i=0 that sets first, second and the number of times of the 3rd rotation;

Step 206: the power P of the signal that measurement isotropic receiving antenna 12 reception mobile phones are launched ' _RiAnd with this power P ' _RiStore a memory block of PC into.

Step 207:PC machine is exported a control signal; Make stepping motor nonsynchronous controller 5 produce a strobe pulse; This strobe pulse makes gating switch 22 moving points connect with first stepping motor; The second and the 3rd stepping motor breaks off, make first stepping motor 8 along direction between up time (along counterclockwise also can) degree that rotates

;

Step 208: the number of times i=i+1 that sets first rotation;

Step 209: judge,, otherwise turn back to step 206 if number of times i=N then carry out step 210;

Step 210: the power P of the signal that measurement isotropic receiving antenna 12 reception mobile phones are launched ' _RiAnd with this power P ' _RiStore a memory block of PC into.

Step 211:PC machine is exported a control signal; Make stepping motor nonsynchronous controller 5 produce a strobe pulse; This strobe pulse makes gating switch 22 moving points connect with second stepping motor; The first and the 3rd stepping motor breaks off, make second stepping motor 7 along direction between up time (along counterclockwise also can) degree that rotates

;

Step 212: the number of times i=i+1 that sets second rotation;

Step 213: judge,, otherwise turn back to step 210 if number of times i=2N then carry out step 214;

Step 214: the power P of the signal that measurement isotropic receiving antenna 12 reception mobile phones are launched ' _RiAnd with this power P ' _RiStore a memory block of PC into.

Step 215:PC machine is exported a control signal; Make stepping motor nonsynchronous controller 5 produce a strobe pulse; This strobe pulse makes gating switch 22 moving points connect with the 3rd stepping motor; First and second stepping motors break off, make the 3rd stepping motor 6 along direction between up time (along counterclockwise also can) degree that rotates

;

Step 216: the number of times i=i+1 that sets the 3rd rotation;

Step 217: judge,, otherwise turn back to step 214 if number of times i=3N then carry out step 218;

Step 218: from another memory block, transfer all measure power P ' _R0, P ' _R1..., P ' _{R (3N-1)}

The intermediate value of getting them is designated as P ' _Jm, that is:

P′ _jm＝Medium(P′ _r0，P′ _r1，...，P′ _r(3N-1))；

Step 219: from look-up table, transfer respective frequencies f _jCalibration conversion factor F _jAnd the isotropically radiated power TRP of calculating mobile phone _j:

TRP _j＝P′ _jm/F _j

After calculating completion, will be corresponding to frequency f _jThe isotropically radiated power TRP of mobile phone _jBe presented in the display 18.

Step 220: judge,, then carry out step 221 if calculated the TRP of all frequencies that need measure, otherwise, change frequency, turn back to step 202;

Step 221: measure and finish.

Embodiment is used for the explanation the present invention of demonstration ground.Specification only is to be used for the construe claim.But protection scope of the present invention is not limited to specification.Any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims (1)

1. the isotropically radiated power asynchronous measurement method of a mobile phone, it comprises the steps:

The first step: transmitting antenna (4) was arranged in the mode resonant cavity, and to make transmitting antenna (4) transmitting power be P _InFrequency is f _jSignal; Wherein, Cross mode resonant cavity and comprise shielded enclosure (17); Be arranged on first group of chaff (11) of shielded enclosure (17) left and right directions, be arranged on second group of chaff (10) of shielded enclosure (17) fore-and-aft direction, and the 3rd group of chaff (9) that is arranged on shielded enclosure (17) above-below direction;

Second step: first group of chaff (11), second group of chaff (10) and the 3rd group of chaff are rotated N time respectively, and the record reflector is when each position, and the sequence of the power of the signal that reception antenna reception transmitting antenna (4) is launched is P _R0, P _R1... and P _{R (3N-1)}, wherein, reception antenna and transmitting antenna are separately positioned on the 3rd group of chaff both sides;

The 3rd step: go out conversion factor F according to computes _j:

F _j＝P _in/Medium(P _r0，P _r1，...，P _r(3N-1))；

Four steps: transmitting antenna (4) is shifted out from crossing in the mode resonant cavity, mobile phone to be measured is arranged on the position of transmitting antenna (4), and the operating frequency of mobile phone is adjusted to f _j, power setting is to maximum;

The 5th step: rotate first, second and the 3rd group of chaff respectively, the record reflector is when each position, and the power sequence that reception antenna receives the signal that mobile phone to be measured launches is P ' _R0, P ' _R1... and P ' _{R (3N-1)}

The 6th step: according to the isotropically radiated power TRP of computes mobile phone to be measured _j:

TRP _j＝Medium(P′ _r0，P′ _r1，...，P′ _r(3N-1))/F _j。

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