CN103454524A - System for measuring electromagnetic compatibility based on geographic information system and programmable attenuator - Google Patents
System for measuring electromagnetic compatibility based on geographic information system and programmable attenuator Download PDFInfo
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Abstract
The invention discloses a system for measuring the electromagnetic compatibility based on a geographic information system and a programmable attenuator. Transmitted signals are received through a direct injection method, interference signals are obtained after programmable attenuation is conducted, measurement and playing back are conducted, output signals are illuminated onto a receiving device through a direct injection method or an all-directional transmitting antenna radiated transmission method, and then the electromagnetic compatibility judgment is conducted. According to the system, the simulation result of a real interference signal, the simulation result of the receiving device and the simulation result of an electromagnetic compatible and coupling path are combined so that the electromagnetic compatibility of the receiving device and a transmitting device can be evaluated, the result is closer to the real condition, and the accuracy is higher. The system is suitable for narrow bandwidth attenuation, but key interference frequency points can be measured in a segmented mode, the measurement method is simple and easy to operate, and the measurement efficiency is improved. Measurement data can be displayed through an instrument such as a GIS playback system and a spectrum analyzer. The measurement can be conveniently conducted, and the data are visualized.
Description
Technical field
The present invention relates to a kind of emc testing system based on Geographic Information System and programmable attenuator, specifically, be a kind of based on radio wave propagation loss is carried out to segmentation arrowband programming the calculating of programmable attenuator, and result is in order to measure and the system and method for the Electro Magnetic Compatibility of assessment receiving equipment.
Background technology
Modern electromagnetic is very complicated, and the electromagnetic environment in the situation of battlefield is particularly severe.China does not also have relatively complete measurement of electromagnetic environment evaluating system.Along with civilian radio communication of the modern times especially develop rapidly of mobile communication business, Wave Propagation Prediction and electromagnetic compatibility test be evaluated at communicate by letter and the optimization of electronic configurations in effect more and more important.Accuracy is high, and the electromagnetic compatibility test than in Large-scale areas that confidence level is good is focus and the difficult point of electromagnetic compatibility discipline development.Predicted method and method of testing are two kinds of basic skills of electromagnetic compatibility assessment, but the former only can obtain theoretical electromagnetic compatibility result, with actual result, may have larger error, and there is the problem that expends a large amount of manpowers, goods and materials and time resource in the latter.
Summary of the invention
The objective of the invention is to propose with a kind of comparatively fast, electromagnetic compatibility test system and method for testing accurately.In real life, the object of electromagnetic compatibility test is the state in motion often, has each other the relative motion attribute, and affiliated radio wave propagation is a kind of communication environments of large scale with the coupling environment.The emc testing system of the present invention's application based on Geographic Information System and programmable attenuator, can solve by comparatively quick, easy mode the transmitter of Large Scale Motion and the frequent transfer equipment that the electromagnetic compatibility test between receiving equipment faces, the problem that consumes a large amount of human and material resources.In the present invention, use the result of calculation of radio wave propagation loss as the important parameter of coupling channel in the electromagnetic compatibility three elements and in conjunction with the Electro Magnetic Compatibility between transceiver parameter testing and evaluating system.
The step that emc testing method based on Geographic Information System and programmable attenuator of the present invention realizes has:
Step 1: test macro receives transmitter and transmits.
Adopt transmitter as transmitting terminal, adopt direct injection, remove the antenna (if transmitter has antenna) of transmitter, with transmission cable A, directly transmitting of transmitter is injected into to the input end of directional coupler A.The cable loss of transmission cable A should strictly be tested and record in advance.
Step 2: directional coupler A input end receives directly transmitting of input of transmitter, by transmitting of directional coupler A on-line measurement and monitoring input, the signal of coupled end is delivered to front end monitoring equipment (comprising frequency spectrograph, oscillograph etc.), the signal of output terminal is delivered to programmable attenuator path loss module.
Step 3: directional coupler A output end signal is carried out to decay able to programme, obtain undesired signal.Directional coupler A will transmit and directly output to the programmable attenuator in programmable attenuator path loss module.Because the decay of programmable attenuator is arrowband for radio wave propagation loss, and receiving equipment is interfered, frequency is also generally arrowband, calculate so interference frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) that need to be comparatively responsive to surveyed receiving equipment carries out the radio wave propagation loss of segmentation, and do not need all frequencies are carried out to decay able to programme by programmable attenuator path loss module.Can shorten the time of calculating like this, reduce the complexity of calculating.
Decay able to programme described above realizes in programmable attenuator, described programmable attenuator adopts the path loss calculation result to carry out decay able to programme, the algorithm that described path loss calculation adopts comprises intervisibility situation path loss algorithm and non-intervisibility situation path loss algorithm, and the result obtained through above-mentioned algorithm is directly inputted to after being revised in programmable attenuator carries out decay able to programme to directional coupler A output end signal.
Step 4: the undesired signal that programmable attenuator path loss module is carried out obtaining after decay able to programme is tested playback.Undesired signal after decay able to programme is exported by directional coupler B: the coupled end signal is by the record of the geography information playback system based on path loss and playback.Geography information playback system based on path loss can playback represent the geographic position at transmitter and receiving equipment place and the field intensity coverage condition of undesired signal, the data through test analysis can be shown by graphical, visual mode image.
The playback system of the geography information based on path loss comprises data storage module, can preserve the output signal of a period of time interior orientation coupling mechanism B coupled end.And can produce by signal playback platform (as signal generator) playback and reproduction the output signal of the directional coupler B coupled end of record.
Step 5: directional coupler B or signal playback platform output end signal can adopt any one in following two kinds of methods to output to receiving equipment, then according to the Electro Magnetic Compatibility of electromagnetic compatibility test standard testing receiving equipment.
(1) adopt the method for directly injecting, by transmission cable B, directional coupler B or signal playback platform output end signal are directly delivered to receiving equipment.
(2) adopt the mode of omnidirectional transmitter antenna radiation-emitting, use the omnidirectional transmitter antenna mode by radiation under the condition that meets the far field test that meets frequency and bandwidth condition to shine on receiving equipment.
Step 6: according to the corresponding testing standard of experiment, the emc testing module in receiving equipment judges whether test result meets Electro Magnetic Compatibility, records result, forms report.
The advantage that the present invention is based on Electro Magnetic Compatibility assessment test macro between the transceiver of Geographic Information System and method of testing thereof is:
(1) realized true interference source, receiving equipment with electromagnetic compatibility coupling channel simulation result, combine the assessment transceiver Electro Magnetic Compatibility.
(2) real undesired signal is gathered, and by the signal after decay by being applied directly on real receiving equipment, with the prediction of traditional electromagnetic compatibility and simulation ratio, result approaches real situation more, precision is higher.
(3) be applicable to the arrowband decay, but can segmentation disturb frequency to be tested to key, method of testing be simple to operation, and improves testing efficiency.Test data can be by instrument displays such as GIS playback system and spectrum analyzers out.Facilitated the operation of test, made visualizing data, visualize.
(4) playback system has increased preservation and prediction electromagnetic interference (EMI) scene mode, does not need repeatedly to produce and transmit, and can keep like this consistance of test condition.Also test data can be recorded, as the data sample of later test.
The accompanying drawing explanation
Fig. 1 is the process flow diagram that the present invention is based on the emc testing method of Geographic Information System and programmable attenuator;
Fig. 2 is the structured flowchart of programmable attenuator path loss module in the present invention;
Fig. 3 is the structured flowchart of the playback system of the geography information based on path loss in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
At first, explain in detail by reference to the accompanying drawings the composition of the emc testing system based on Geographic Information System and programmable attenuator in the present invention.Referring to Fig. 1, described emc testing system comprises following ingredient:
Transmitter, transmission cable A, directional coupler A, front end monitoring equipment, programmable attenuator path loss module, directional coupler B, the geography information playback system based on path loss, signal playback platform, transmission cable B, omnidirectional transmitter antenna and emc testing module (also claiming receiving equipment).
In the emc testing system, the connected mode of modules and equipment is: transmitter is connected with the input end of directional coupler A by transmission cable A, the coupled end of directional coupler A connects the front end monitoring equipment, and directional coupler A output terminal connects programmable attenuator path loss module.The input end of described directional coupler B connects programmable attenuator path loss module, directional coupler B coupled end connects the geography information playback system based on path loss, and directional coupler B output terminal connects the emc testing module by transmission cable B or omnidirectional transmitter antenna.Simultaneously, can connect the data storage module in the geography information playback system based on path loss with the signal playback platform, by transmission cable B or omnidirectional transmitter antenna, connect the emc testing module.
In the emc testing system, the flow direction of test signal is as follows: transmitting of transmitter is directly injected into the input end of directional coupler A by transmission cable A, the coupled end of the part that transmits by directional coupler A is transferred to front end monitoring equipment (comprising oscillograph, frequency spectrograph etc.), and the output terminal of another part by directional coupler A is input in programmable attenuator path loss module and carries out decay able to programme and correction.Through decay able to programme and revised signal, a part is transferred to the geography information playback system based on path loss that is connected to directional coupler B coupled end and carries out the playback supervision, another part signal is transferred to receiving equipment by transmission cable B or omnidirectional transmitter antenna, detects the Electro Magnetic Compatibility of receiving equipment by the emc testing module on receiving equipment.The described geography information playback system based on path loss can record the signal through decay able to programme and correction, and producing test signal by signal playback platform (as signal generator) playback, test signal is transferred to receiving equipment by transmission cable B or omnidirectional transmitter antenna.
Referring to Fig. 2, described programmable attenuator path loss module comprises programmable attenuator, path loss calculation module and test macro attenuation correction module.Geography information module and transceiver block of state provide the required geographical environment of path loss calculation and electromagnetic environment data to programmable attenuator path loss module.Wherein, the geography information module provides the test desired data, comprises geography information and electromagnetic environment information (as receiving equipment electromagnetic environment data); The transceiver block of state comprises the device parameter information of receiving equipment, device parameter information and the transceiver three-dimensional motion parameter of transmitter.The parameter that the path loss calculation module is imported in conjunction with above-mentioned geography information module, transceiver block of state is to the calculating that decays of the signal subsection of different frequency, the step 3 during the pathloss attenuation algorithm vide infra.The result of calculating through decay is passed through the correction of test macro attenuation correction module, the step 3 during correction algorithm vide infra again.Through revised result, be transferred in programmable attenuator, for directional coupler A output end signal being carried out to the segmentation decay of different frequency.Described geography information comprises longitude, latitude, the elevation information of receiving equipment, the longitude of transmitter, latitude and elevation information, the information relevant to geography such as the height between receiving equipment and transmitter on line, the gradient, gradient, section and vegetation covering.Described electromagnetic environment information comprises the electromagnetism ground unrest of transmitter and receiving equipment position.
The device parameter of described transmitter comprises: the important parameters such as emissive power, transmitted bandwidth, transmitter frequency of operation, emission efficiency, noisiness, harmonic responses, clutter rejection characteristic band external characteristics, antenna tilt, antenna factor; The device parameter of receiving equipment comprises: the important parameters such as receiver sensitivity, selectivity characteristic, intermodulation rejection characteristic, frequency stability, local oscillator radiation characteristic, operation of receiver frequency, receiving antenna directivity, receiving antenna gain, receiving antenna antenna factor, receiving antenna band external characteristics.Described transceiver three-dimensional motion parameter comprises the parameters such as the movement velocity, direction of motion, acceleration of transmitter and receiving equipment.
Referring to Fig. 3, the framework of the geography information playback system based on path loss in the present invention is according to the Master's thesis " research and implementation of GIS wireless network management system " of in September, 2007 Zhou Chengcheng of Shanghai Communications University, and the disclosure of the design of the 3rd chapter GIS wireless network management system is improved.Consisting of of geography information playback system based on path loss in the present invention: data importing module, backup recovery module, database, user's basic operation module, Spatial Data Engine, engine map, data readback represent module, information inquiry module, specific analysis functional module, data storage module, print module, server or computing machine, user interface etc.Wherein specific analysis functional module and data storage module are increase part of the present invention, and the function of specific analysis Implement of Function Module is explaination in detail in step 4, and the function of data storage module is explaination in detail in step 5.
The data flow of the geography information playback system based on path loss is as follows: the data importing module (comprises geographic information data by the data of the described geography information module of Fig. 2 (structured flowchart of programmable attenuator path loss module), the electromagnetic environment information data), the data of the reiving/transmitting state module (device parameter of transmitter and receiving equipment, shown in the three-dimensional motion parameter of transceiver etc. and Fig. 1 (structured flowchart of the emc testing system based on Geographic Information System and programmable attenuator) after the decay able to programme of directional coupler A output terminal decay front signal able to programme and directional coupler B coupled end signal import in the database of the geography information playback system based on path loss.The data of database can be recovered the module backup by backup.The operations such as user's basic operation module can directly increase database, deletion, modification, inquiry, index.Can on server or computing machine, realize that by Spatial Data Engine and engine map data readback represents the function of module, information inquiry module, specific analysis functional module, data storage module, print module.Finally, these modules and operation can realize man-machine interaction by good user interface.
Electromagnetic compatibility test system based on above-mentioned, the present invention also provides a kind of method of testing, and referring to Fig. 1, the implementation step that described method of testing is concrete is as follows:
Step 1: test macro receives transmitter and transmits.
Transmitting terminal with transmitter as test macro, adopt direct injection, removes the antenna (if transmitter has antenna) of transmitter, with transmission cable A, directly transmitting of transmitter is injected into to the input end of directional coupler A.The cable loss of transmission cable A should strictly be tested and record in advance.
Step 2: directional coupler A input end receives directly transmitting of input of transmitter, by transmitting of directional coupler A on-line measurement and monitoring input, the signal of coupled end is delivered to front end monitoring equipment (comprising frequency spectrograph, oscillograph etc.), the signal of output terminal is delivered to the programmable attenuator road through the loss module.
Step 3: transmitting of directional coupler A output terminal carried out to decay able to programme.Directional coupler A directly outputs to programmable attenuator by signal.Because the decay of programmable attenuator is arrowband (the radio wave attenuation degree that is certain bandwidth is nonlinear with the variation of frequency) for radio wave propagation loss, and receiving equipment is interfered, frequency is also generally arrowband, calculate so interference frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) that need to be comparatively responsive to surveyed receiving equipment carries out the radio wave propagation loss of segmentation, and do not need all frequency decay.Can shorten the time of calculating like this, reduce the complexity of calculating.
Described radio wave propagation loss calculates and comprises intervisibility situation path loss algorithm and non-intervisibility situation path loss algorithm.In the present invention, the path loss algorithm is only considered the radio wave propagation of earth surface homogeneous atmosphere, does not consider the atmospheric duct pattern.
When meeting sighting condition, travel path (meets the condition that there is no effective shelter between transmitter and receiving equipment), with radio wave propagation algorithm or the two footpaths of the ground return model of free space.The radio wave propagation of free space be electric wave in a kind of desirable, uniform, isotropic dielectric space, do not reflect, the radio wave propagation situation of refraction, scattering and absorbing phenomenon, so only have the electromagnetic wave energy diffusion and the propagation loss that causes.When electromagnetic wave, in the different medium junction, can reflect.The two footpaths of ground return model has not only been considered aerial direct projection travel path, has also considered the reflection paths on ground.Intervisibility situation path loss algorithm described in the present invention is " mobile circumstances " that China Machine Press published in August, 2003, and Yang great Cheng writes; The propagation of the 3rd chapter the 3.2nd joint free space and the disclosed content of the 3.3rd joint reflection.
The formula of the two footpaths of the ground return of intervisibility situation model path loss algorithm is:
Wherein, P
rfor arriving the power of receiving equipment, P after path loss
temissive power for the transmitter place; G
t, G
rbe respectively emitting antenna and receiving antenna gain, d is the distance between emitting antenna and receiving antenna, h
tfor Launch Equipment Shop at position height and transmitter height sum, h
rfor receiving equipment position height and receiving equipment height sum.
Referring to Fig. 3, P
tcorresponding programmable attenuator decay front signal power level, P
rsignal power strength after corresponding programmable attenuator decay.G
t, G
rfor the device parameter of transmitter and receiving equipment, h
t, h
r, d is geographic information data, and along with real-time the changing of the three-dimensional motion parameter of transceiver.These parameters are calculated by Fig. 2 programmable attenuator path loss module.Computing formula is formula (1).When non-intervisibility situation is propagated, diffraction, reflection and diffraction phenomena can occur when electromagnetic wave propagation.Diffraction makes radiowave can pass barrier, forms field intensity and diffraction field intensity at the barrier rear.Non-intervisibility situation algorithm is divided into two kinds of situations of the outdoor propagation of mountainous propagation and city.
For the mountainous propagation situation of non-intervisibility situation, consider to use knife-edge computing method, spirit (Bulling ton) method, Etta Lars (Atlas) method etc. to calculate radio wave propagation loss.The electric wave of the non-intervisibility situation described in the present invention is " mobile circumstances " that China Machine Press published in August, 2003 at the propagation algorithm of Mountain Conditions, and Yang great Cheng writes; The 3rd chapter 3.4.3 saves the disclosed content of multiple knife-edge diffraction.
The knife-edge computing method of take here in non-intervisibility situation is the example explaination:
Tooth shape is propagated two kinds of modes, i.e. negative altitude pattern and just height pattern, the two footpath model path loss algorithm calculating path losses of the ground return of the above-mentioned intervisibility situation of positive height schema reference.
In the negative altitude pattern,, than the low H rice of the peak of the geographical height between equipment, now there are a diffraction coefficient v in transmitter and receiving equipment:
Wherein, λ is signal wavelength, and the pass of wavelength and frequency is: λ=C/f (C is the light velocity, the frequency that f is signal).So this algorithm need be used the calculating of segmentation, for some, crucial frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) calculates respectively, obtains corresponding wavelength.D
1for the distance of peak between transmitter and transceiver, d
2distance for peak between receiving equipment and transceiver.
For different diffraction coefficient v, obtain different diffraction loss values, with F (dB), mean, computing formula is as follows:
The loss of free space is:
Wherein, P
rfor arriving the power of receiving equipment, P after path loss
temissive power for the transmitter place; G
t, G
rbe respectively emitting antenna and receiving antenna gain, d is the distance between emitting antenna and receiving antenna, and λ is signal wavelength.
So under the knife-edge negative altitude pattern in non-intervisibility situation, the computing formula of path loss is:
L
m(dB)＝PL(dB)+F(dB) （5）
The corresponding corresponding frequency of the corresponding path loss calculation result of above-mentioned formula (5), different frequency computation part is difference as a result.
Referring to Fig. 3, P
tcorresponding programmable attenuator decay front signal power level, L
msignal power strength (logarithmic form) after corresponding programmable attenuator decay.H
t, h
rfor geographic information data, H is poor draw, d than line between the value of the peak of the geographical height between equipment and transmitter and receiving equipment in the value at peak place by transmitter and receiving equipment
1for the distance of peak between transmitter and transceiver, d
2distance for peak between receiving equipment and transceiver.And the three-dimensional motion parameter h along with transceiver
t, h
r, H, d
1, d
2real-time changes.These parameters are calculated by Fig. 2 programmable attenuator path loss module.
If not the intervisibility situation is in the situation that the outdoor propagation in city, the main macrocellular model that uses: the expansion---COST231-WI model, LEE macrocellular model, Egli model and the Carey model, and Bertoni-Xia model and TIREM model etc. that comprise Longley-Rice model and Durkin model, Okumura model, Hata model (comprising Okumura-Hata model and COST-231Hata model), Walfisch and Bertoni model and this model.The electric wave of the non-intervisibility situation described in the present invention propagation algorithm outdoor in city is " mobile circumstances " that China Machine Press published in August, 2003, and Yang great Cheng writes; The disclosed content of the 4th chapter the 4.2nd joint outdoor macro honeycomb propagation model.
Non-intervisibility situation in city outdoor propagation algorithm take the Okumura-Hata model and explained as example:
In urban district, the Okumra-Hata experimental formula is as follows:
L
m＝69.55+26.16lgf-13.82lg(h
te)-a(h
re)+[44.9-6.55lg(h
te)]lgd （6）
In formula, L
mbe this model algorithm path loss calculation value, f is carrier frequency; h
teit is the transmitter significant height; h
reit is the receiving equipment significant height; D is the distance between transmitter and receiving equipment; a(h
re) be the modifying factor of equipment moving, its numerical value depends on environment.
For small and medium-sized cities, have:
a(h
re)＝(1.1logf-0.7)h
re-(1.56logf-0.8)dB （7）
For the big city municipalization:
a(h
re)＝8.29(log1.54h
re)
2-1.1dB (f＜300MHz) （8）
a(h
re)＝3.2(log11.75h
re)
2-4.97dB (f＞300MHz) （9）
In suburb, the Okumra-Hata experimental formula is modified to:
L
m=L (urban district)-2[log (f/28)]
2-5.4 (10)
In rural area, the Okumra-Hata experimental formula is modified to:
L
m=L (urban district)-4.78 (logf)
2-18.33logf-40.98 (11)
The corresponding corresponding narrow band frequency of the path loss calculation result that above-mentioned formula (6) is corresponding to (11), different frequency computation part is difference as a result.The implementation procedure of above-mentioned algorithm is not considered loss L3, the L4 of loss L1, L2, directional coupler A and directional coupler B of transmission cable A and transmission cable B and the error E 1 of programmable attenuator.Wherein, L1, L2, L3, L4, E1 all have in the operation instructions of instrument and obtain.
Now, correction formula is:
L=L
m+L1+L2+L3+L4+E1 （12）
L is final loss result of calculation.
Because the programmable attenuator programming realizes the decay to wideband frequency, but the decay of path loss is a broadband attenuation, its frequency is higher, decays larger, otherwise also sets up.So, need with reference to above-mentioned intervisibility situation path loss algorithm and non-intervisibility situation path loss algorithm, by programmable attenuator programme achieve a butt joint receiving unit comparatively the disturbance frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) of sensitivity carry out pathloss attenuation calculating.Step 4: the undesired signal after the programmable attenuator decay is tested to playback.Signal after decay able to programme is exported by directional coupler B: the coupled end signal is by geography information playback system record, preservation and playback based on path loss.
Geography information playback system based on path loss can playback represent the geographic position at transmitter and receiving equipment place and the field intensity coverage condition of undesired signal, the data through test analysis can be shown by graphical, visual mode image.Geography information playback system basic function based on path loss:
(1) be supported in the modification of playing up of movement locus in Geographic Information System (GIS), as the pattern of revising track etc.And support the Presentation Function of the sampled value of track, be supported in test trails side automatic powder adding oil (gas) filling device travel direction and speed function.
(2) support to carry out the management of each figure layer according to figure layer control mode for example loading, the deletion of figure layer, the functions such as layer position, skew.Carry out marking Function arbitrarily on support figure layer, and mark can be exported as to new form.
(3) support thematic map generalization, modification, accurately show covering and the loss result of calculation of field intensity.Support to carry out in GIS the cutting pooling function of data, and legend can be floated, support a plurality of GIS windows to contrast to open etc.
The data storage module of the playback system of the geography information based on path loss is preserved the output signal of a period of time interior orientation coupling mechanism B coupled end.Produce the output signal of the directional coupler B coupled end of record by signal playback platform (as signal generator) playback and reproduction.By this method, result from the step 1 to the step 4 can be repeated to use like this, need not test the testing process of repeating step all to step 4 at every turn, can realize the repeatedly test to same transmitter undesired signal, be applicable to the test occasion that undesired signal repeatability is had relatively high expectations.Step 5: directional coupler B or signal playback platform output end signal can adopt any one in following two kinds of methods to output to receiving equipment, then according to the Electro Magnetic Compatibility of electromagnetic compatibility test standard testing receiving equipment.
(1) adopt the method for directly injecting, by transmission cable B, the signal after decay is directly delivered to receiving equipment.
(2) adopt the mode of omnidirectional transmitter antenna radiation-emitting, use the omnidirectional transmitter antenna mode by radiation under the condition that meets the far field test that meets frequency and bandwidth condition to shine on receiving equipment.
Step 6: according to the corresponding testing standard of experiment, judge whether test result meets Electro Magnetic Compatibility, records result, form report.
Claims (5)
1. the emc testing method based on Geographic Information System and programmable attenuator is characterized in that comprising as follows:
Step 1: test macro receives transmitter and transmits;
Adopt direct injection, with transmission cable A, directly transmitting of transmitter is injected into to the input end of directional coupler A;
Step 2: directional coupler A input end receives directly transmitting of input of transmitter, by transmitting of directional coupler A on-line measurement and monitoring input, the signal of coupled end is delivered to the front end monitoring equipment, the signal of output terminal is delivered to programmable attenuator path loss module;
Step 3: directional coupler A output end signal is carried out to decay able to programme, obtain undesired signal;
Described programmable attenuator path loss module comprises path loss calculation module, test macro attenuation correction module and programmable attenuator, described path loss calculation module is carried out path loss calculation according to geography information and transceiver status information, result of calculation is carried out attenuation correction in test macro attenuation correction module, then the attenuation correction result is input in programmable attenuator directional coupler A output end signal is carried out to decay able to programme, obtain undesired signal; Step 4: described undesired signal is tested to playback.Undesired signal after decay able to programme is by directional coupler B output: directional coupler B coupled end signal is by the record of the geography information playback system based on path loss and playback, and will record result and be kept in data storage module;
Step 5: directional coupler B or signal playback platform output end signal adopt any one in following two kinds of methods to output to receiving equipment, then according to the Electro Magnetic Compatibility of electromagnetic compatibility test standard testing receiving equipment:
(1) adopt the method for directly injecting, by transmission cable B, directional coupler B or signal playback platform output end signal are directly delivered to receiving equipment;
(2) adopt the mode of omnidirectional transmitter antenna radiation-emitting to shine on receiving equipment;
Step 6: according to the corresponding testing standard of experiment, the emc testing module in receiving equipment judges whether test result meets Electro Magnetic Compatibility, records result, forms report.
2. a kind of emc testing method based on Geographic Information System and programmable attenuator according to claim 1, it is characterized in that: described path loss calculation comprises intervisibility situation path loss algorithm and non-intervisibility situation path loss algorithm.
3. a kind of emc testing method based on Geographic Information System and programmable attenuator according to claim 1, it is characterized in that: described attenuation correction is considered loss L3, the L4 of loss L1, L2, directional coupler A and directional coupler B of transmission cable A and transmission cable B and the error E 1 of programmable attenuator, obtains revised final loss result of calculation and is:
L=L
m+L1+L2+L3+L4+E1 （12）。
4. a kind of emc testing method based on Geographic Information System and programmable attenuator according to claim 1, it is characterized in that: the playback of described signal playback platform and reproduction produce the output signal of the directional coupler B coupled end of record, and as test signal.
5. the emc testing system based on Geographic Information System and programmable attenuator, it is characterized in that: described test macro comprises transmitter, transmission cable A, directional coupler A, the front end monitoring equipment, programmable attenuator path loss module, directional coupler B, geography information playback system based on path loss, the signal playback platform, transmission cable B, omnidirectional transmitter antenna and emc testing module, transmitter is connected with the input end of directional coupler A by transmission cable A, the coupled end of directional coupler A connects the front end monitoring equipment, directional coupler A output terminal connects programmable attenuator path loss module, the input end of described directional coupler B connects programmable attenuator path loss module, directional coupler B coupled end connects the geography information playback system based on path loss, and directional coupler B output terminal connects the emc testing module by transmission cable B or omnidirectional transmitter antenna.Simultaneously, the signal playback platform connects the data storage module in the geography information playback system based on path loss, by transmission cable B or omnidirectional transmitter antenna, connects the emc testing module.
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