CN102571235B - 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 invention provides a kind of asynchronous measurement method of isotropically radiated power of mobile phone, belong 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 radiation of equipment performance is measured, and its object is exactly concatenation ability and the impact of terminal user on radiation and receptivity of checking wireless device and network.Wherein, for weighing travelling carriage three dimensions RF radiation power, the spherical effective isotropic radiated power of specifying measurement travelling carriage, is called for short 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) in the OTA TRP testing scheme providing, comprise two kinds of modes, i.e. circular cone cutting method (distribution axle system) and great circle cutting method (built-up shaft system).For great circle cutting method scheme, the EUT navigation system of its relative complex can complete the function around Phi axle and the rotation of Theta axle by EUT, therefore only need to adopt single antenna just can complete the test of TRP; For circular cone cutting method scheme, it only can complete the function that EUT is rotated around Phi axle relative to simple EUT navigation system, therefore need in Theta direction, arrange in addition that rotatable reception antenna (single antenna scheme) measures successively, or arrange that a plurality of test antennas form arrays (many antenna scheme) and measure simultaneously.

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

Multimode cavity is as the concrete application of waveguide resonant theory in microwave technical field, its essence is that is crossed a mode resonant cavity, by excite abundant eigenmodes in the metallic cavity of high conductivity, set up the electromagnetic environment (statistics uniform field) of a kind of space uniform, isotropism, random polarization.Above-mentioned feature based on crossing mode resonant cavity, we can utilize it to carry out radiated immunity test, radiation emission test, screening effectiveness test and antenna efficiency test etc.Compare with traditional test site, aspect mistake mode resonant cavity is many in cost, Measuring Time, effective analog composite field etc., advantage is outstanding.For example: in mistake mode resonant cavity, without the interior absorbing material that covers, the Q value of cavity resonance is very high, therefore can use relatively little power, obtains larger field intensity and higher dynamic range.

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

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

Wherein, the unit of parameter a, b, c is rice, and m, n, p are natural number.The concrete value of every group of m, n, p is corresponding a concrete intrinsic (resonance) pattern all, and it is all to determine and different that the electromagnetic field under every kind of pattern distributes.In addition, because m, n, p must get natural number, so above-mentioned eigenmodes frequency is discontinuous, in resonant cavity, eigenmodes (resonance) frequency of electromagnetic field can only be got a series of specific, discontinuous numerical value.

For common Single-mode Resonator, we make to only have unique a kind of pattern to exist in resonant cavity by controlling the frequency of driving source, and now, its field distribution is determined; If but operating frequency band were brought up to the intensive interval of pattern, now in resonant cavity, not only there is a kind of pattern, i.e. multimode cavity.When mode of operation quantity in multimode cavity is 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 by certain mode all multimodal composition situation that participates in additive process, also will there is marked change in field distribution so.By continuous adjustment modes, form, constantly change the field distribution in cavity, finally can in cavity, form the electromagnetic environment of space uniform, isotropism, random polarization, add up uniform field.

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

As mentioned above, 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 all multimodal composition situation that participates in additive process.The most frequently used mode is exactly to place and rotoflector in the metal of high Q value is crossed mode resonant cavity body at present.In addition, by the position in change source, realized mode resonant cavity and be also fine, yet in existing technology, do not provide a kind of system of the isotropically radiated power of mobile phone of how measuring in crossing mode resonant cavity.

Summary of the invention

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

For realizing described 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 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, record reflector when each position, the sequence that reception antenna receives the power of the signal that transmitting antenna 4 launches 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: calculate conversion factor F according to following formula _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 mode resonant cavity, mobile phone to be measured is arranged on to 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 respectively first, second, and third group of chaff, record reflector when each position, 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: the isotropically radiated power TRP that calculates mobile phone to be measured according to following formula _j:

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

Utilize asynchronous measurement method that the present invention proposes can accurately measure the isotropically radiated power of mobile phone, and it is low to have expense, takes up an area littlely, safeguard the advantages such as simple.

Accompanying drawing explanation

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 the schematic diagram of crossing mode resonant cavity provided by the invention;

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

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

Fig. 5 is the composition diagram of the perspective of the forward from the 3rd axle provided by the invention 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

Below in conjunction with attached drawings, describe the present invention in detail.In accompanying drawing, identical Reference numeral represents 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; The first stepping motor 8, it is by first group of chaff of belt drives, 11 rotations; The second stepping motor 7, it is by second group of chaff of belt drives, 10 rotations; The 3rd stepping motor 6, it is by the 3rd group of chaff of belt drives 9 rotations; Stepping motor nonsynchronous controller 5, asynchronous driving the first stepping motor 8 of its timesharing under the control of PC, the second stepping motor 7 or the 3rd stepping motor 6; Gating switch 22, its strobe pulse of sending here according to PC is connected controllor for step-by-step motor respectively with the first stepping motor 8, the second stepping motor 7 or the 3rd stepping motor 6; Signal source 2, during calibration, it produces a signal that needs calibration frequency under the control of PC; Power amplifier 3, during calibration, the signal that its amplifying signal source 2 produces, and be amplified to the power P that PC sets _in; Reception antenna 12, it is arranged in 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 switching electrical signals that mobile phone to be measured is launched; Electrical to optical converter 13, it is arranged in shielded enclosure 17, and the signal of telecommunication that reception antenna 12 is received converts light signal to, and this light signal arrives PC through Optical Fiber Transmission; Optical fiber receiving card 14, is responsible for reading light signal, and is scaled after performance number and leaves in fixing memory cell and read for PC; Wireless comprehensive test instrument 15, its function and mobile phone to be measured in the control Imitating base station of PC connects, by this connection PC, 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, it is for showing test results.PC is connected by gpib bus realization and the equipment such as comprehensive test instrument, signal source, power amplifier, stepping motor nonsynchronous controller.

Fig. 2 is the schematic diagram of crossing mode resonant cavity provided by the invention.As shown in Figure 2, shielded enclosure 17 is cuboid, and the equal high conductivity metal plate of its six faces (for example: galvanized steel plain sheet) make, be provided with opening 20 before it.The dependence test article such as mobile phone to be measured (or standard dipole antenna) are by this shield door turnover shielded enclosure.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 axle identical with shielded enclosure length and be evenly arranged on d blade on the first axle, and second group of chaff 10 comprises the second axle and be evenly arranged on h blade on the second axle.The 3rd group of chaff 9 comprises the 3rd axle and is arranged on g blade on the 3rd axle.Described blade is that the length of side is the square aluminium flake of L.The first axle can be placed on support, also can be arranged on the Zuo Bi and right wall of shielded enclosure.The second axle is arranged on the front face and rear wall of shielded enclosure.The 3rd axle is arranged on the end face and bottom surface of shielded enclosure.

Fig. 3 is that the forward from the first axle 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 the positive direction that the right of shielded enclosure 17 is axle, left is to the negative direction that is axle, and first group of chaff is to form like this: the blade that d length of side is L is divided into the first axle identical d+1 interval equally spacedly; The 1st blade d in d blade ₁be arranged on the 1st position of the first axle, blade d ₁with the angle of the positive direction of the first axle be 45 degree; The 2nd blade d in d blade ₂be arranged on the 2nd position of the first axle, and around the first axle along clockwise direction with respect to the 1st blade d ₁rotation 360/d degree, the 3rd blade d in d blade ₃be arranged on the 3rd position of the first axle, around the first axle along clockwise direction with respect to the 2nd blade d ₂rotation 360/d degree, the like, d blade d in d blade _dbe arranged on d position of the first axle, around the first axle along clockwise direction with respect to d-1 blade d _d-1rotation 360/d degree.; In the present invention, preferably the length of the first axle equals the length about shielded enclosure, is all made as 4m, and blade quantity d is 5, i.e. blade d ₁, d ₂, d ₃, d ₄and d ₅, 5 blades are divided into 6 equal intervals by the first axle.

Fig. 4 is the composition diagram that the forward from the second axle 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, the place ahead is to the negative direction that is axle, and second group of chaff is to form like this: the blade that h length of side is L is divided into the second axle identical h+1 interval equally spacedly; The 1st blade h in h blade ₁be arranged on the 1st position of the second axle, blade h ₁with the angle of the positive direction of the second axle be 45 degree; The 2nd blade h in h blade ₂be arranged on the 2nd position of the second axle, and around the second axle along clockwise direction with respect to the 1st blade h ₁rotation 360/h degree; The 3rd blade h in h blade ₃be arranged on the 3rd position of the first axle, around the second axle along clockwise direction with respect to the 2nd blade h ₂rotation 360/h degree, the like, h blade h in h blade _hbe arranged on h position of the second axle, around the second axle along clockwise direction with respect to h-1 blade h _h-1rotation 360/h degree.In the present invention, preferably the length of the second axle equals the length before and after shielded enclosure, is all made as 3m, and blade quantity h is 4, i.e. blade h ₁, h ₂, h ₃and h ₄, 4 blades are divided into 5 equal intervals by the first axle.

Fig. 5 is the composition diagram that the forward from the 3rd axle 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 axle positive direction, below is the negative direction of the 3rd axle, and the 3rd group of chaff is to form like this: the blade that g length of side is L is divided into the 3rd axle identical g+1 interval equally spacedly; The 1st blade g in g blade ₁be arranged on the 1st position of the 3rd axle, blade g ₁with the angle of the positive direction of the 3rd axle be 45 degree; The 2nd blade g in g blade ₂be arranged on the 2nd position of the 3rd axle, and around the 3rd axle 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 position of the 3rd axle, around the 3rd axle along clockwise direction with respect to the 2nd blade g ₂rotation 360/g degree, the like, g blade g in g blade _gbe arranged on g position of the 3rd axle, around the 3rd axle along clockwise direction with respect to g-1 blade g _g-1rotation 360/g degree.In the present invention, preferably the length of the 3rd axle equals the upper and lower height of shielded enclosure, is all made as 2.5m, and blade quantity g is 3, i.e. blade g ₁, g ₂and g ₃, 3 blades are divided into 4 equal intervals by the 3rd axle.

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

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

Step 102: by the frequency f in PC signalization source 2 _jpower P with power amplifier _in, this frequency f _jthe frequency that needs calibration, it is identical with the test frequency of mobile phone to be measured;

Step 103: the signal that signal source 2 is produced amplifies and launches by standard dipole antenna 4 through power amplifier;

Step 104: the number of times of setting first, second, and third axle rotation by PC is N, and three axle number of revolutions are corresponding with measuring number of times, and measurement number of times is 3N, in the present invention, N choosing is greater than or equal to 33 natural number;

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

Step 106: the power P of the signal that measurement isotropic receiving antenna 12 reception standard dipole antennas 4 are launched _riand by 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 form 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 the first stepping motor, the second and the 3rd stepping motor disconnects, and makes the first stepping motor 8 along rotating along time orientations (in the counterclockwise direction also can)

degree;

Step 108: set the number of times i=i+1 that the first axle rotates;

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

Step 110: the power P of the signal that measurement isotropic receiving antenna 12 reception standard dipole antennas 4 are launched _riand by 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 the second stepping motor, the first and the 3rd stepping motor disconnects, and makes the second stepping motor 7 along rotating along time orientations (in the counterclockwise direction also can)

degree;

Step 112: set the number of times i=i+1 that the second axle rotates;

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

Step 114: the power P of the signal that measurement isotropic receiving antenna 12 reception standard dipole antennas 4 are launched _riand by 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, the first and second stepping motors disconnect, and make the 3rd stepping motor 6 along rotating along time orientations (in the counterclockwise direction also can) degree;

Step 116: set the number of times i=i+1 that the 3rd axle rotates;

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

Step 118: transfer all measurement power P from memory block _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 is outputed in the look-up table that PC arranges to the theing contents are as follows of look-up table:

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

In table, M represents the number of the frequency of needs calibration, 1≤j≤M.

Step 120: judgement, if need the frequency of calibration all to draw conversion factor, carry out step 121, otherwise replacement frequency, turns 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 to 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 the first stepping motor 8, the second stepping motor 7, the 3rd stepping motor 6, comprehensive test instrument 15 and mobile phone to be measured 16 initialization by PC;

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

Step 203: mobile phone 16 is transmitted;

Step 204: by PC, measurement number of times being set is also N;

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

Step 206: the power P of the signal that measurement isotropic receiving antenna 12 reception mobile phones are launched ' _riand by 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 the moving point of gating switch 22 connect with the first stepping motor, the second and the 3rd stepping motor disconnects, and makes the first stepping motor 8 along rotating along time orientations (in the counterclockwise direction also can)

degree;

Step 208: set the number of times i=i+1 that the first axle rotates;

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

Step 210: the power P of the signal that measurement isotropic receiving antenna 12 reception mobile phones are launched ' _riand by 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 the moving point of gating switch 22 connect with the second stepping motor, the first and the 3rd stepping motor disconnects, and makes the second stepping motor 7 along rotating along time orientations (in the counterclockwise direction also can)

degree;

Step 212: set the number of times i=i+1 that the second axle rotates;

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

Step 214: the power P of the signal that measurement isotropic receiving antenna 12 reception mobile phones are launched ' _riand by 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 the moving point of gating switch 22 connect with the 3rd stepping motor, the first and second stepping motors disconnect, and make the 3rd stepping motor 6 along rotating along time orientations (in the counterclockwise direction also can)

degree;

Step 216: set the number of times i=i+1 that the 3rd axle rotates;

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

Step 218: from another memory block, transfer all measurement 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: transfer respective frequencies f from look-up table _jcalibration conversion factor F _jand calculate the isotropically radiated power TRP of mobile phone _j:

TRP _j＝P′ _jm/F _j

After calculating completes, will be corresponding to frequency f _jthe isotropically radiated power TRP of mobile phone _jbe presented in display 18.

Step 220: judgement, if calculated all TRP that need the frequency of measurement, carry out step 221, otherwise replacement frequency, turns back to step 202;

Step 221: measure and finish.

Embodiment illustrates the present invention for demonstrating.Specification is only for explaining claims.But protection scope of the present invention is not limited to specification.In the technical scope that any those skilled in the art of being familiar with disclose in the present invention, the variation that can expect easily or replacement, within all should being encompassed in 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. an isotropically radiated power asynchronous measurement method for mobile phone, it comprises the steps:

The first step: transmitting antenna (4) was arranged in 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, record reflector when each position, 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: calculate conversion factor F according to following formula _j:

F _j=P _in/ Medium (P _r0, P _r1..., P _{r (3N-1)}), wherein, Medium (P _r0, P _r1... and P _{r (3N-1)}) represent to get P _r0, P _r1..., P _{r (3N-1)}intermediate value;

The 4th step: transmitting antenna (4) is shifted out from crossing in mode resonant cavity, mobile phone to be measured is arranged on to 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 respectively first, second, and third group of chaff, record reflector when each position, 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: the isotropically radiated power TRP that calculates mobile phone to be measured according to following formula _j:

TRP _j=Medium (P ' _r0, P ' _r1..., P ' _{r (3N-1)})/F _j, wherein, Medium (P ' _r0, P ' _r1..., P ' _{r (N-1)}) represent to get P ' _r0, P ' _r1... and P ' _{r (3N-1)}intermediate value.

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