CN103454524B - A kind of emc testing system based on Geographic Information System and programmable attenuator - Google Patents
A kind of emc testing system based on Geographic Information System and programmable attenuator Download PDFInfo
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Abstract
The invention discloses a kind of emc testing system based on Geographic Information System and programmable attenuator, the present invention adopts direct injection to receive and transmits, obtain undesired signal after carrying out decay able to programme and carry out test playback, output signal adopts the mode of method or the employing omnidirectional transmitter antenna radiation-emitting directly injected to be irradiated on receiving equipment, carries out Electro Magnetic Compatibility judgement.Present invention achieves true interference source, receiving equipment to combine with electromagnetic compatibility coupling channel simulation result and assess the Electro Magnetic Compatibility of transceiver; Result is more close to real situation, and precision is higher; Be applicable to arrowband decay, but can segmentation test key interference frequency, method of testing is simple to operation, and improves testing efficiency.Can being shown by instruments such as GIS playback system and spectrum analyzers of test data.Facilitate the operation of test, make visualizing data, visualize.
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 ofly based on programmable attenuator, segmentation arrowband program calculation is carried out to radio wave propagation loss, and result is in order to measure and the system and method for Electro Magnetic Compatibility of assessment receiving equipment.
Background technology
Modern electromagnetic is very complicated, and 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 the develop rapidly of modern times civilian radio communication especially mobile communication business, Wave Propagation Prediction is more and more important in the effect with in the optimization of electronic configurations that communicates with assessment with electromagnetic compatibility test.Accuracy is high, focus and the difficult point of electromagnetic compatibility discipline development that what confidence level was good compared with the electromagnetic compatibility test in Large-scale areas is.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, and may there is comparatively big error with actual result, the latter exists the problem of at substantial manpower, goods and materials and time resource.
Summary of the invention
The object of the invention is proposition one comparatively fast, electromagnetic compatibility test system and method for testing accurately.In real life, the object of electromagnetic compatibility test is often in the state of motion, has relative motion attribute each other, and affiliated radio wave propagation and coupling environment are a kind of communication environments of large scale.The present invention's application, can the electromagnetic compatibility test solved between the transmitter of Large Scale Motion and receiving equipment faces by comparatively quick, easy mode frequent transfer equipment, the problem that consumes a large amount of human and material resources based on the emc testing system of Geographic Information System and programmable attenuator.In the present invention by the result of calculation of radio wave propagation loss as the important parameter of coupling channel in 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 one: test macro receives transmitter and transmits.
Adopt transmitter as transmitting terminal, adopt direct injection, remove the antenna (if transmitter has antenna) of transmitter, directly transmitting of transmitter is injected into the input end of directional coupler A with transmission cable A.The cable loss of transmission cable A should strictly be tested and record in advance.
Step 2: what directional coupler A input end reception transmitter directly inputted transmits, what inputted by directional coupler A on-line measurement and monitoring is transmitted, 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: decay able to programme is carried out to directional coupler A output end signal, obtains undesired signal.Directional coupler A directly outputs to the programmable attenuator in programmable attenuator path loss module by transmitting.Because the decay of programmable attenuator is arrowband for radio wave propagation loss, and receiving equipment is interfered, frequency is also generally arrowband, so the radio wave propagation loss needing the interference frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) comparatively responsive to surveyed receiving equipment to carry out segmentation calculates, and do not need to carry out decay able to programme to all frequencies by programmable attenuator path loss module.The time of calculating can be shortened like this, reduce the complexity calculated.
Decay able to programme described above realizes in programmable attenuator, described programmable attenuator adopts 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 in programmable attenuator after revising carries out decay able to programme to directional coupler A output end signal.
Step 4: the undesired signal obtained after carrying out decay able to programme to programmable attenuator path loss module carries out test playback.Undesired signal after decay able to programme is exported by directional coupler B: coupled end signal is by based on the geography information playback system record of path loss and playback.Geography information playback system based on path loss playback can represent the geographic position at transmitter and receiving equipment place and the Field strength coverage situation of undesired signal, the data through test analysis can be shown by graphical, visual mode image.
Playback system based on the geography information of path loss comprises data storage module, can preserve the output signal of a period of time interior orientation coupling mechanism B coupled end.And the output signal of the directional coupler B coupled end of record is produced by signal playback platform (as signal generator) playback and reproduction.
Step 5: directional coupler B or signal playback platform output end signal can adopt in the following two kinds method any one output to receiving equipment, then according to the Electro Magnetic Compatibility of electromagnetic compatibility test standard testing receiving equipment.
(1) adopt the method directly injected, 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 mode of omnidirectional transmitter antenna by radiation under the condition meeting far field test meeting frequency and bandwidth condition to be irradiated on receiving equipment.
Step 6: experimentally corresponding testing standard, the emc testing module in receiving equipment judges whether test result meets Electro Magnetic Compatibility, and record result, forms report.
Between the transceiver that the present invention is based on Geographic Information System, the advantage of Electro Magnetic Compatibility assessment test macro and method of testing thereof is:
(1) achieve true interference source, receiving equipment to combine with electromagnetic compatibility coupling channel simulation result and assess the Electro Magnetic Compatibility of transceiver.
(2) real undesired signal is gathered, and by the signal after decay by being applied directly on real receiving equipment, with traditional EMC prediction and simulation ratio, result is more close to real situation, and precision is higher.
(3) be applicable to arrowband decay, but can segmentation test key interference frequency, method of testing is simple to operation, and improves testing efficiency.Can being shown by instruments such as GIS playback system and spectrum analyzers of test data.Facilitate the operation of test, make visualizing data, visualize.
(4) playback system adds and preserves and prediction electromagnetic interference (EMI) scene mode, does not need repeatedly to produce to transmit, and can keep the consistance of test condition like this.Also test data record can be got up, as the data sample of test later.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the emc testing method that the present invention is based on 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 based on the playback system of the geography information of path loss in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
First, the composition based on the emc testing system of Geographic Information System and programmable attenuator in the present invention is explained by reference to the accompanying drawings in detail.See 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, geography information playback system, signal playback platform, transmission cable B, omnidirectional transmitter antenna and emc testing module (also claiming receiving equipment) based on path loss.
In emc testing system, modules with the connected mode of 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 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 emc testing module by transmission cable B or omnidirectional transmitter antenna.Meanwhile, can connect based on the data storage module in the geography information playback system of path loss with signal playback platform, connect emc testing module by transmission cable B or omnidirectional transmitter antenna.
In 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 part that transmits is transferred to front end monitoring equipment (comprising oscillograph, frequency spectrograph etc.) by the coupled end of directional coupler A, and another part is input in programmable attenuator path loss module by the output terminal of directional coupler A 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 being connected to directional coupler B coupled end and carries out playback supervision, another part signal is transferred to receiving equipment by transmission cable B or omnidirectional transmitter antenna, is detected 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.
See 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 geographical environment needed for path loss calculation and electromagnetic environment data to programmable attenuator path loss module.Wherein, geography information module provides test desired data, comprises geography information and electromagnetic environment information (as receiving equipment electromagnetic environment data); Transceiver block of state comprises the device parameter information of receiving equipment, the device parameter information of transmitter and transceiver three-dimensional motion parameter.Path loss calculation module is carried out decay in conjunction with the parameter that above-mentioned geography information module, transceiver block of state import into the signal subsection of different frequency and is calculated, the step 3 during pathloss attenuation algorithm vide infra.The result calculated through decay passes through the correction of test macro attenuation correction module, the step 3 during correction algorithm vide infra again.Be transferred in programmable attenuator through revised result, for carrying out the segmentation decay of different frequency to directional coupler A output end signal.Described geography information comprises longitude, latitude, the elevation information of receiving equipment, the longitude of transmitter, latitude and elevation information, the information that the height between receiving equipment and transmitter on line, the gradient, gradient, section are relevant to geography with vegetative coverage etc.Described electromagnetic environment information comprises the electromagnetic background noise 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 recognition 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 parameter such as movement velocity, direction of motion, acceleration of transmitter and receiving equipment.
See Fig. 3, based on the Master's thesis " research and implementation of GIS wireless network management system " of the framework of the geography information playback system of path loss according in September, 2007 Shanghai Communications University Zhou Chengcheng in the present invention, the disclosure of the design of the 3rd chapter GIS wireless network management system is improved.Consisting of based on the geography information playback system of path loss in the present invention: data importing module, Backup and Restore 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 explained in detail in step 4, and the function of data storage module is explained in detail in step 5.
Data flow based on the geography information playback system of path loss is as follows: the data of the geography information module described in Fig. 2 (structured flowchart of programmable attenuator path loss module) (are comprised geographic information data by data importing module, electromagnetic environment information data), data (the device parameter of transmitter and receiving equipment of reiving/transmitting state module, shown in the three-dimensional motion parameters of transceiver etc. and Fig. 1 (structured flowchart based on the emc testing system of Geographic Information System and programmable attenuator), the attenuated signal able to programme of directional coupler A output terminal decay able to programme front signal and directional coupler B coupled end imports in the database based on the geography information playback system of path loss.The data of database can be backed up by Backup and Restore module.The operations such as user's basic operation module directly can increase database, delete, revise, inquire about, index.The function that data readback represents module, information inquiry module, specific analysis functional module, data storage module, print module can be realized on server or computing machine by Spatial Data Engine and engine map.Finally, these modules and operation can realize man-machine interaction by good user interface.
Based on above-mentioned electromagnetic compatibility test system, the present invention also provides a kind of method of testing, and see Fig. 1, the implementation step that described method of testing is concrete is as follows:
Step one: test macro receives transmitter and transmits.
With the transmitting terminal of transmitter as test macro, adopt direct injection, remove the antenna (if transmitter has antenna) of transmitter, directly transmitting of transmitter is injected into the input end of directional coupler A with transmission cable A.The cable loss of transmission cable A should strictly be tested and record in advance.
Step 2: what directional coupler A input end reception transmitter directly inputted transmits, what inputted by directional coupler A on-line measurement and monitoring is transmitted, 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 road through loss module.
Step 3: decay able to programme is carried out to transmitting of directional coupler A output terminal.Signal is directly outputted to programmable attenuator by directional coupler A.Because the decay of programmable attenuator is arrowband (namely the radio wave attenuation degree of certain bandwidth is nonlinear with the change of frequency) for radio wave propagation loss, and receiving equipment is interfered, frequency is also generally arrowband, so the radio wave propagation loss needing the interference frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) comparatively responsive to surveyed receiving equipment to carry out segmentation calculates, and do not need all frequency decay.The time of calculating can be shortened like this, reduce the complexity calculated.
Described radio wave propagation loss calculates and comprises intervisibility situation path loss algorithm and non-intervisibility situation path loss algorithm.Path loss algorithm of the present invention only considers the radio wave propagation of earth surface homogeneous atmosphere, does not consider atmospheric duct pattern.
(condition not having effective shelter between transmitter and receiving equipment, is met), with radio wave propagation algorithm or the ground return double-path model of free space when travel path meets sighting condition.The radio wave propagation of free space be electric wave in a kind of desirable, uniform, isotropic dielectric space, do not reflect, reflect, the radio wave propagation situation of scattering and absorbing phenomenon, so only there is electromagnetic wave energy diffusion and the propagation loss that causes.When electromagnetic wave is in different medium junction, can reflect.Ground return double-path model not only considers aerial direct projection travel path, also contemplates 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 Section of 3.2 free space and Section of 3.3 disclosed content of reflection.
The formula of the ground return double-path model path loss algorithm of intervisibility situation is:
Wherein, P
rfor arriving the power of receiving equipment after path loss, P
tfor the emissive power at 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 is in position height and transmitter height sum, h
rfor receiving equipment position height and receiving equipment height sum.
See Fig. 3, P
tcorresponding programmable attenuator decay front signal power level, P
rcorresponding programmable attenuator attenuated signal power level.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 three-dimensional motion parameter of transceiver.These parameters are calculated by Fig. 2 programmable attenuator path loss module.Computing formula is formula (1).When electromagnetic wave propagation is propagated in non-intervisibility situation, diffraction, reflection and diffraction phenomena can be there is.Diffraction enables radiowave through barrier, forms field intensity and diffraction field intensity at barrier rear.Non-intervisibility situation algorithm is divided into mountainous propagation and city outdoor propagation two kinds of situations.
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; 3rd chapter 3.4.3 saves content disclosed in multiple knife-edge diffraction.
Here explain for the knife-edge computing method in non-intervisibility situation:
Tooth shape is propagated has two kinds of modes, i.e. negative altitude pattern and positive height mode, and positive height mode is with reference to the ground return double-path model path loss algorithm calculating path loss of above-mentioned intervisibility situation.
In negative altitude pattern, i.e., now there is a diffraction coefficient v in transmitter and receiving equipment H rice lower than the peak of the geographical height between equipment:
Wherein, λ is signal wavelength, and the pass of wavelength and frequency is: λ=C/f (C is the light velocity, and f is the frequency of signal).So this algorithm need use the calculating of segmentation, the frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) namely for some keys calculates respectively, obtains corresponding wavelength.D
1for the distance of peak between transmitter and transceiver, d
2for the distance of peak between receiving equipment and transceiver.
For different diffraction coefficient v, obtain different diffraction loss values, represent with F (dB), computing formula is as follows:
The loss of free space is:
Wherein, P
rfor arriving the power of receiving equipment after path loss, P
tfor the emissive power at 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 the computing formula of path loss is under knife-edge negative altitude pattern in non-intervisibility situation:
L
m(dB)＝PL(dB)+F(dB) （5）
The corresponding corresponding frequency of path loss calculation result corresponding to above-mentioned formula (5), different frequency computation part results is different.
See Fig. 3, P
tcorresponding programmable attenuator decay front signal power level, L
mcorresponding programmable attenuator attenuated signal power level (logarithmic form).H
t, h
rfor geographic information data, H by transmitter and receiving equipment than the value of the peak of the geographical height between equipment and between transmitter and receiving equipment line do difference in the value of peak and draw, d
1for the distance of peak between transmitter and transceiver, d
2for the distance of peak between receiving equipment and transceiver.And along with the three-dimensional motion parameter h of 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 intervisibility situation is when city outdoor propagation, main use macrocellular model: 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 propagation algorithm of electric wave in outdoor, city of the non-intervisibility situation described in the present invention is " mobile circumstances " that China Machine Press published in August, 2003, and Yang great Cheng writes; Content disclosed in 4th Section 4.2, chapter outdoor macro honeycomb propagation model.
Non-intervisibility situation is explained for Okumura-Hata model at city outdoor propagation algorithm:
In urban district, 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 values, f is carrier frequency; h
teit is transmitter significant height; h
reit is 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.
Small and medium-sized cities are had:
a(h
re)＝(1.1logf-0.7)h
re-(1.56logf-0.8)dB （7）
For 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, Okumra-Hata experimental formula is modified to:
L
m=L (urban district)-2 [log (f/28)]
2-5.4 (10)
In rural area, Okumra-Hata experimental formula is modified to:
L
m=L (urban district)-4.78 (logf)
2-18.33logf-40.98 (11)
Above-mentioned formula (6) is to the corresponding corresponding narrow band frequency of the path loss calculation result that (11) are corresponding, and different frequency computation part results is different.The implementation procedure of above-mentioned algorithm does not consider loss L1, the L2 of transmission cable A and transmission cable B, loss L3, the L4 of directional coupler A and directional coupler 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 calculation result.
Because programmable attenuator programming realization is to the decay of wideband frequency, but the decay of path loss is a broadband attenuation, and 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, the disturbance frequency (as local oscillator frequency, harmonic frequency, intermodulation frequency and intermodulation frequency etc.) comparatively responsive to receiving equipment by programmable attenuator programming realization carries out pathloss attenuation calculating.Step 4: test playback is carried out to the undesired signal after programmable attenuator decay.Signal after decay able to programme is exported by directional coupler B: coupled end signal is by based on the geography information playback system record of path loss, preservation and playback.
Geography information playback system based on path loss playback can represent the geographic position at transmitter and receiving equipment place and the Field strength coverage situation 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) what be supported in the middle movement locus of Geographic Information System (GIS) plays up amendment, as revised the pattern etc. of track.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) management carrying out each layer according to chart engage mode is supported, the loading of such as layer, deletion, the function such as layer position, skew.Support layer carries out arbitrary marking Function, and mark can be exported as new form.
(3) support thematic map generalization, amendment, accurately show covering and the loss calculation result of field intensity.Support the cutting pooling function of carrying out data in GIS, and legend can be floated, and supports that multiple GIS window carries out contrast and opens.
Data storage module based on the playback system of the geography information of path loss preserves the output signal of a period of time interior orientation coupling mechanism B coupled end.The output signal of the directional coupler B coupled end of record is produced by signal playback platform (as signal generator) playback and reproduction.By this method, can be repeated to use from step one to the result of step 4 like this, need not test at every turn all repeat the testing process of step one to step 4, the repeatedly test to same transmitter undesired signal can be realized, be applicable to require higher test occasion to undesired signal repeatability.Step 5: directional coupler B or signal playback platform output end signal can adopt in the following two kinds method any one output to receiving equipment, then according to the Electro Magnetic Compatibility of electromagnetic compatibility test standard testing receiving equipment.
(1) adopt the method directly injected, 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 mode of omnidirectional transmitter antenna by radiation under the condition meeting far field test meeting frequency and bandwidth condition to be irradiated on receiving equipment.
Step 6: experimentally corresponding testing standard, judges whether test result meets Electro Magnetic Compatibility, and record result, forms report.
Claims (5)
1., based on an emc testing method for Geographic Information System and programmable attenuator, it is characterized in that comprising as follows:
Step one: test macro receives transmitter and transmits;
Adopt direct injection, directly transmitting of transmitter is injected into the input end of directional coupler A with transmission cable A;
Step 2: what directional coupler A input end reception transmitter directly inputted transmits, what inputted by directional coupler A on-line measurement and monitoring is transmitted, the signal of coupled end is delivered to front end monitoring equipment, the signal of output terminal is delivered to programmable attenuator path loss module;
Step 3: decay able to programme is carried out to directional coupler A output end signal, obtains 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 carries out path loss calculation according to geography information and transceiver status information, result of calculation carries out attenuation correction in test macro attenuation correction module, then attenuation correction result is input in programmable attenuator and decay able to programme is carried out to directional coupler A output end signal, obtain undesired signal;
Step 4: test playback is carried out to described undesired signal; Undesired signal after decay able to programme is exported by directional coupler B: record result by based on the geography information playback system record of path loss and playback, and is kept in data storage module by directional coupler B coupled end signal;
Step 5: directional coupler B or signal playback platform output end signal adopt in the following two kinds method any one output to receiving equipment, then according to the Electro Magnetic Compatibility of electromagnetic compatibility test standard testing receiving equipment:
(1) adopt the method directly injected, by transmission cable B, directional coupler B or signal playback platform output end signal are directly delivered to receiving equipment;
(2) mode of omnidirectional transmitter antenna radiation-emitting is adopted to be irradiated on receiving equipment;
Step 6: experimentally corresponding testing standard, the emc testing module in receiving equipment judges whether test result meets Electro Magnetic Compatibility, and record result, forms report.
2. a kind of emc testing method based on Geographic Information System and programmable attenuator according to claim 1, 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 considers loss L1, the L2 of transmission cable A and transmission cable B, loss L3, the L4 of directional coupler A and directional coupler B and the error E 1 of programmable attenuator, and obtaining revised final loss calculation result is:
L＝L
m+L1+L2+L3+L4+E1
L
mfor path loss calculation values.
4. a kind of emc testing method based on Geographic Information System and programmable attenuator according to claim 1, it is characterized in that: described signal playback platform playback 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, front end monitoring equipment, programmable attenuator path loss module, directional coupler B, based on the geography information playback system of path loss, 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 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 emc testing module by transmission cable B or omnidirectional transmitter antenna, meanwhile, signal playback platform connects based on the data storage module in the geography information playback system of path loss, connects emc testing module by transmission cable B or omnidirectional transmitter antenna.
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