CN103454523B - Electro Magnetic Compatibility measuring method between a kind of transceiver based on Geographic Information System - Google Patents
Electro Magnetic Compatibility measuring method between a kind of transceiver based on Geographic Information System Download PDFInfo
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Abstract
The invention discloses the Electro Magnetic Compatibility measuring method between a kind of transceiver based on Geographic Information System, belong to technical field of electromagnetic compatibility measurement.In described method, transmitting of transmitter adopts directly injection or radiation mode to receive, calculated by Path Loss for Radio Wave Propagation and carry out playback monitoring after revising, and adopting after playback and directly to inject or radiation mode is sent on receiving equipment and carries out emc testing.Present invention achieves true undesired signal, receiving equipment to combine with electromagnetic compatibility coupling channel three result of calculation and assess the Electro Magnetic Compatibility of transceiver; Simplify the flow process of test, reduce the difficulty of test, reduce the expense of test, with traditional EMC prediction and simulation ratio, result is more close to real situation, and precision is higher.
Description
Technical field
The invention belongs to technical field of electromagnetic compatibility measurement, relate to the electromagnetic compatibility measuring system between a kind of transceiver based on Geographic Information System, specifically, be a kind of radio wave propagation loss is calculated based on electronic chart, and result of calculation is in order to measure and to assess the system of the Electro Magnetic Compatibility of transceiver.
Background technology
The fast development of wireless communication technology makes the electromagnetic interference signal highly dense in the finite space, electromagnetic environment become very complicated.How accurate evaluation regional area is interior is received and dispatched focus and the difficult point that equipment room emc issue is present electromagnetic compatibility discipline development.Electromagnetic compatibility appraisal procedure between the transceiver of present stage comprises predicted method and mensuration, and the former only can obtain theoretical electromagnetic compatibility result, may there is comparatively big error with actual result, and the latter exists the problem of the manpower of at substantial, goods and materials and time resource.
Summary of the invention
The present invention is directed in traditional electromagnetic compatibility test process, to the deficiency of large scale emc testing of transceiver with relative motion attribute, propose the Electro Magnetic Compatibility evaluating system between a kind of transceiver based on Geographic Information System.Based on Geographic Information System, to the situation needing frequently to transfer equipment and transceiver in electromagnetic compatibility test and have movement properties, with loss calculation result data as the important parameter of coupling channel in electromagnetic compatibility three elements and in conjunction with the Electro Magnetic Compatibility between transceiver assessment and test macro.
Based on the transceiver Electro Magnetic Compatibility measuring method of Geographic Information System, the step of realization has:
Step one: the test that transmitter transmits receives.
With transmitter as transmitting terminal, a kind of method in the following two kinds of methods of plan use is by the input test system that transmits of transmitter;
(1) direct injection, with transmission cable A directly by the signal injection of transmitter in the signal acquisition module of test macro;
(2) use isotropic receiving antenna and non-frequency-selecting type broadband radiation measuring instrument to receive to transmit.
Step 2: data acquisition module is sampled to transmitting: signal acquisition module is sampled to described transmitting, then uploads sampled data and is input in PC main control computer.Described sampled data meets nyquist sampling law, makes the energy of the energy in as far as possible wide frequency band collected.
Step 3: Path Loss for Radio Wave Propagation calculating is carried out to sampled data.Path Loss for Radio Wave Propagation calculates and adopts intervisibility situation path loss algorithm or non-intervisibility situation path loss algorithm.
Step 4: the Path Loss for Radio Wave Propagation result of calculation of step 3 gained is carried out playback.
Step 5: the test data playback of preserving in (AWG (Arbitrary Waveform Generator), the playback signal source) playback of signal playback platform or calling data memory module.
Step 6: playback signal can adopt following two kinds of methods any one output to 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 7: experimentally corresponding testing standard, 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 measuring method is:
(1) achieve true undesired signal, receiving equipment to combine with electromagnetic compatibility coupling channel three result of calculation and assess the Electro Magnetic Compatibility of transceiver.
(2) with based on path loss geography information playback system radio propagation environment that is virtually reality like reality or be called the coupling channel of electromagnetic compatibility, simplify the flow process of test, reduce the difficulty of test, reduce the expense of test.
(3) method of hardware-in-the-loop simulation is adopted, real undesired signal is gathered, and the signal after emulation being produced is applied directly on real receiving equipment by strict playback system, with traditional EMC prediction and simulation ratio, result is more close to real situation, and precision is higher.
(4) the present invention has good applicability for wider frequency range (about 2G bandwidth), and test data can be shown by instruments such as GIS playback system and spectrum analyzers.Facilitate the operation of test, make visualizing data, visualize.
(5) playback system adds data storage module, can preserve and predict electromagnetic disturbance scene mode, does not need to carry out multi collect to transmitting, and can reduce the number of times of test, and keeps the consistance of test.
Accompanying drawing explanation
Fig. 1 be the present invention is based on Geographic Information System transceiver between the process flow diagram of emc testing method.
Fig. 2 is the structured flowchart of PC main control computer 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 between Geographic Information System and transceiver 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, all-wave darkroom or open area test site, transmission cable A, isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument, signal acquisition module, PC main control computer path loss calculation module; Based on the geography information playback system of path loss, signal playback platform, transmission cable B, omnidirectional transmitter antenna and emc testing module.
Flow to based on the connected mode of modules and equipment in the emc testing system between Geographic Information System and transceiver and signal: transmitter will transmit in the mode of conduction or radiation and be transferred to testing apparatus (i.e. receiving equipment).If by conduction pattern, then use transmission cable A, transmitter is directly connected with signal acquisition module.If pass through radiation mode, first need to judge whether transmitting of transmitter meets the less condition of far field condition (algorithm is see step one), if far field condition is less, then test site can select all-wave darkroom, if far field condition is comparatively large, then test site can select open area test site.The equipment that reception transmitter transmits can select isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument.The signal received can be gathered by signal acquisition module, at this moment transmit from analog-signal transitions be digital signal.The digital signal collected carries out by PC main control computer path loss calculation module the programming decay and the correction (algorithm and modification method are see step 3) that cover signal bandwidth.Through overdamping and revised signal, monitored by the geography information playback system playback based on path loss, real-time again decay and the digital signal that obtains after revising are produced test signal by signal playback platform (as arbitrarily signal generating device, playback signal source) playback, described test signal is transferred to emc testing module and receiving equipment by transmission cable B or omnidirectional transmitter antenna again.
See Fig. 2, described PC main control computer path loss calculation module comprises path loss calculation module, test macro attenuation correction module, pathloss attenuation module.Geography information module and transceiver block of state provide geographical environment needed for path loss calculation and electromagnetic environment data to PC main control computer path loss calculation module.Wherein, geography information module provides test desired data, comprises geography information and electromagnetic environment information (as receiving equipment background electromagnetic environmental 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 different frequency of parameter to the signal bandwidth covering signal acquisition module collection that above-mentioned geography information module, transceiver block of state import into 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.Decayed by pathloss attenuation module through revised result.Digital signal after decay imports the geography information playback system based on path loss into.
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: emissive power, transmitted bandwidth, transmitter frequency of operation, emission efficiency, noisiness, harmonic responses, clutter recognition characteristic band external characteristics, antenna tilt, the important parameters such as antenna factor; The device parameter of receiving equipment comprises: receiver sensitivity, selectivity characteristic, intermodulation rejection characteristic, frequency stability, local oscillator radiation characteristic, operation of receiver frequency, the important parameters such as 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, the substantially affected module of user, Spatial Data Engine, engine map, data readback represent module, information inquiry module, specific analysis functional module, data storage module, print module, live signal generation 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 PC main control computer 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, the three-dimensional motion parameter of transceiver etc. and Fig. 1 (based on Geographic Information System transceiver between the process flow diagram of emc testing method) signal after the PC main control computer path loss analysis module decay that exports 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 memory 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.The deamplification data that PC main control computer path loss calculation module in database obtains can generate the data of corresponding format by live signal generation module, be input to signal playback platform.
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: the test that transmitter transmits receives.
With the transmitting terminal of transmitter as test macro, a kind of method in the following two kinds of methods of plan use is by the input test system that transmits of transmitter;
(1) use direct injection, remove the antenna (if having antenna) of transmitter, with transmission cable A directly by the signal injection of transmitter in the signal acquisition module of test emulation system;
(2) use isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument to receive to transmit, first need to judge whether to meet Antenna Far Field condition:
Far-Field antennas measurement system condition computing formula:
In formula: R is the distance of antenna to border, far-field region, and D is the full-size of antenna physical bore, and λ is operation wavelength.
If Antenna Far Field condition is less, namely R is less than the measuring distance in all-wave darkroom, then can measure in all-wave darkroom, if R is greater than the measuring distance in all-wave darkroom, then needs to test at open area test site.Receiving equipment with isotropic receiving antenna or can have the corresponding non-frequency-selecting type broadband radiation measuring instrument of isotropy, receive transmitting of transmitter, like this, emittance in a quite wide frequency band can be measured and measurement result does not rely on the polarised direction of field.
Note: the serviceability of surveying instrument should meet field to be measured requirement, and instrument answers periodic calibration and calibrating.Detection should use the surveying instrument of omni-directional probe (antenna) as far as possible.When using non-omni-directional probe (antenna), detection means must regulate detection direction, until measure maximum field intensity value.Should meet detection requirement for the frequency range of isotropic receiving antenna A or non-frequency-selecting type broadband radiation measuring instrument and range, the linearity of the frequency response of such as popping one's head in frequency range should be better than 1.5dB, and other frequencies that probe covers should be better than 3dB; Also concrete Index Constraints should be proposed for dynamic range and isotropy.
Step 2: data acquisition module is sampled to transmitting.The signal that the harassing and wrecking signal obtained by direct injection or isotropic receiving antenna (or non-frequency-selecting type broadband radiation measuring instrument) receive, is uploaded after being sampled be input in PC main control computer by data acquisition module.Data sampling should meet nyquist sampling law, makes the energy of the energy in as far as possible wide frequency band collected.
Step 3: Path Loss for Radio Wave Propagation calculating is carried out to sampled data.
Path Loss for Radio Wave Propagation 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:
In formula, 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 isotropic receiving antenna A gain, d is the distance between emitting antenna and isotropic receiving antenna A, 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, the corresponding relation of parameter: P in the parameter in formula and test macro
tthe signal intensity that respective signal acquisition module collects, P
rthe corresponding attenuated signal intensity obtained after PC main control computer path loss calculation module.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 PC main control computer path loss calculation module.Computing formula is formula (2).
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 needs to calculate respectively the diffraction coefficient of the wavelength corresponding to different frequencies.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) （6）
The corresponding corresponding frequency of path loss calculation result corresponding to above-mentioned formula (6), different frequency computation part results is different.
See Fig. 3, the corresponding relation of parameter: P in the parameter in formula and test macro
tthe signal intensity that respective signal acquisition module collects, P
rthe corresponding attenuated signal intensity through PC main control computer path loss analysis module.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 the PC main control computer path loss calculation module of Fig. 2.
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." mobile circumstances " that the propagation algorithm of electric wave in outdoor, city of the non-intervisibility situation described in the present invention is published in August, 2003 see China Machine Press, 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 （7）
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 （8）
For big city municipalization:
a(h
re)＝8.29(log1.54h
re)
2-1.1dB(f＜300MHz) （9）
a(h
re)＝3.2(log11.75h
re)
2-4.97dB(f＞300MHz) （10）
In suburb, Okumra-Hata experimental formula is modified to:
L
m=L (urban district)-2 [log (f/28)]
2-5.4 (11)
In rural area, Okumra-Hata experimental formula is modified to
L
m=L (urban district)-4.78 (logf)
2-18.33logf-40.98 (12)
The frequency that above-mentioned formula (7) is fixed to the path loss calculation result correspondence that (12) are corresponding, for different frequencies, needs to carry out the path loss result using loop structure to calculate different frequency in certain bandwidth of programming.The implementation procedure of above-mentioned algorithm do not consider transmission cable A or and loss L1, the L2 of transmission cable B or the antenna gain G1 of isotropic receiving antenna (non-frequency-selecting type broadband radiation measuring instrument), and the antenna gain G2 of omnidirectional transmitter antenna.
Now, for the mode of different experiments transmitting and receiving signal, correction algorithm is as follows:
Directly inject for use transmission cable A, the mode that transmission cable B exports, correction algorithm is:
L=L
m+L1+L2 （13）
Directly inject for use transmission cable A, omnidirectional transmitter antenna launches the mode exported, and correction algorithm is:
L=L
m+L1+G2 （14）
Receive for use isotropic receiving antenna (non-frequency-selecting type broadband radiation measuring instrument) and transmit, the mode that transmission cable B exports, correction algorithm is:
L=L
m+G1+L2 （15）
Receive for use isotropic receiving antenna (non-frequency-selecting type broadband radiation measuring instrument) and transmit, the mode that omnidirectional transmitter antenna is launched, correction algorithm is:
L=L
m+G1+L2 （16）
L is the final revised result of loss calculation.
Step 4: the result of calculation of PC main control computer path loss calculation module gained is input in the geography information playback system based on path loss and carries out playback, so that monitor lossy data and manage.Meanwhile, path loss calculation result is stored in data memory module, calls test in order to later stage 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.
Step 5: signal playback platform (AWG (Arbitrary Waveform Generator), playback signal source) playback path loss calculation result, or the test data of preserving in calling data memory module carries out playback.
This replayed section content comprises path loss calculation result, and also comprise the various information in geography information module and transceiver block of state, the object of playback is to provide the signal sending to receiving equipment.Can realize after transmitter once transmits, carrying out emc testing to multiple receiving equipment by this replayed section, and without the need to repeatedly transmitting.
Step 6: the signal of signal playback platform playback can adopt following two kinds of methods any one output to 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 7: experimentally corresponding testing standard, judges whether test result meets Electro Magnetic Compatibility, and record result, forms report.
Claims (6)
1. based on Geographic Information System transceiver between an Electro Magnetic Compatibility measuring method, it is characterized in that comprising the steps:
Step one: the test transmitted of transmitter receives; Described transmitter is connected with signal acquisition module by transmission cable A, or is connected with signal acquisition module by isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument;
Step 2: signal acquisition module is sampled to transmitting of transmitter, then uploads sampled data and is input in PC main control computer; Described sampling meets nyquist sampling law;
Step 3: Path Loss for Radio Wave Propagation calculating is carried out to sampled data; Path Loss for Radio Wave Propagation calculates and adopts intervisibility situation path loss algorithm or non-intervisibility situation path loss algorithm;
Step 4: the Path Loss for Radio Wave Propagation result of calculation of step 3 gained is carried out playback, and is stored in data memory module;
Step 5: the test data playback of preserving in the playback of signal playback platform or calling data memory module; Described test data refers to that the electric wave in step 4 broadcasts path loss calculation result;
Step 6: any one of the following two kinds of methods of playback signal employing outputs to 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 omnidirectional transmitter antenna meeting frequency and bandwidth condition to be irradiated on receiving equipment by the mode of radiation under the condition meeting far field test;
Step 7: experimentally testing standard, judges whether test result meets Electro Magnetic Compatibility, and record result, forms report.
2. the Electro Magnetic Compatibility measuring method between a kind of transceiver based on Geographic Information System according to claim 1, it is characterized in that: the test transmitted of the transmitter described in step one receives, and uses a kind of method in following two kinds of methods by the input test system that transmits of transmitter;
(1) direct injection, is directly injected in the signal acquisition module of test macro by transmitting of transmitter with transmission cable A;
(2) isotropic receiving antenna and non-frequency-selecting type broadband radiation measuring instrument is used to receive transmitting of transmitter.
3. the Electro Magnetic Compatibility measuring method between a kind of transceiver based on Geographic Information System according to claim 1, is characterized in that: described signal playback platform is AWG (Arbitrary Waveform Generator) or playback signal source.
4. the Electro Magnetic Compatibility measuring method between a kind of transceiver based on Geographic Information System according to claim 1, it is characterized in that: in step 3, the result that Path Loss for Radio Wave Propagation calculates will be revised, and considers the loss L1 of transmission cable A and transmission cable B, L2; Isotropic receiving antenna or the non-antenna gain G1 of frequency-selecting type broadband radiation measuring instrument and the antenna gain G2 of omnidirectional transmitter antenna, directly inject for use transmission cable A, the mode that transmission cable B exports, correction algorithm is:
L＝L
m+L1+L2 (13)
Directly inject for use transmission cable A, omnidirectional transmitter antenna launches the mode exported, and correction algorithm is:
L＝L
m+L1+G2 (14)
For using isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument to receive transmitting of transmitter, the mode that transmission cable B exports, correction algorithm is:
L＝L
m+G1+L2 (15)
For using isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument to receive transmitting of transmitter, the mode that omnidirectional transmitter antenna is launched, correction algorithm is:
L＝L
m+G1+L2 (16)
L is result after final loss calculation correction, L
mfor path loss calculation values.
5. based on Geographic Information System transceiver between an Electro Magnetic Compatibility measurement mechanism, it is characterized in that: described device comprises transmitter, transmission cable A, isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument, signal acquisition module, PC main control computer path loss calculation module, geography information playback system, signal playback platform, transmission cable B, omnidirectional transmitter antenna and emc testing module based on path loss; Described transmitter is connected with signal acquisition module by transmission cable A, or is connected with signal acquisition module by isotropic receiving antenna or non-frequency-selecting type broadband radiation measuring instrument; Signal acquisition module by transmitter transmit from analog-signal transitions be digital signal, digital signal by PC main control computer path loss calculation module carry out cover signal bandwidth programming decay and revise; Through overdamping and revised signal, monitored by the geography information playback system playback based on path loss, real-time again decay and the digital signal that obtains after revising are produced test signal by the playback of signal playback platform, described test signal is transferred to emc testing module by transmission cable B or omnidirectional transmitter antenna again.
6. the Electro Magnetic Compatibility measurement mechanism between a kind of transceiver based on Geographic Information System according to claim 5, is characterized in that: described PC main control computer path loss calculation module comprises path loss calculation submodule, test macro attenuation correction module, pathloss attenuation module; The different frequency of the parameter that path loss calculation module combining geographic information module, transceiver block of state import into the signal bandwidth covering signal acquisition module collection carries out decay and calculates, the result calculated through decay passes through the correction of test macro attenuation correction module again, is decayed by pathloss attenuation module through revised result; Digital signal after decay imports the geography information playback system based on path loss into.
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| CN112019281B (en) * | 2019-05-31 | 2022-07-08 | 北京小米移动软件有限公司 | Audio breakthrough performance testing method, device, equipment and storage medium |
| CN113358966B (en) * | 2021-06-25 | 2022-06-17 | 中国民用航空飞行学院 | Electromagnetic environment assessment method and system for civil aviation navigation station |
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