CN105763272A - Self-calibration radio environment testing platform and testing method thereof - Google Patents
Self-calibration radio environment testing platform and testing method thereof Download PDFInfo
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- CN105763272A CN105763272A CN201610301137.XA CN201610301137A CN105763272A CN 105763272 A CN105763272 A CN 105763272A CN 201610301137 A CN201610301137 A CN 201610301137A CN 105763272 A CN105763272 A CN 105763272A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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Abstract
Provided are a self-calibration radio environment testing platform and a testing method thereof.The testing platform is formed by sequentially connecting an antenna and antenna control module, a signal receiving module and a calibration module, wherein the signal receiving module is formed by connecting a low noise amplifier with a frequency spectrometer and a frequency spectrum control computer, the antenna and antenna control module is composed of a test antenna, a controllable rotary table and a rotary table control computer, the calibration module is formed by connecting a microwave switch with an affiliated noise source, a 50-ohm matched load and the low noise amplifier, a noise source is connected with a control switch through a control signal, the control switch is connected with a microwave switch control computer, and one computer host is adopted by the frequency spectrum control computer, the rotary table control computer and the microwave switch control computer.The self-calibration radio environment testing platform and the testing method thereof have the advantages that operation visualization is achieved, data is conveniently recorded, the self-calibration function is achieved, operation is easy, and field operation is easy.
Description
Technical field
The present invention relates to monitoring radio-frequency spectrum field, it is adaptable to field automated wireless electrical environment is measured and Kan Xuandeng field, large-scale radio astronomical telescope platform location.
Background technology
Along with the development of electronic technology, radio astronomy equipment progressively be instead of original pseudo-terminal by digital terIninal.So being greatly promoted the efficiency of radio astronomy observation, more than radio window almost whole radio frequency band all incorporates radio astronomy observation category.But develop rapidly along with the whole society is informationalized, increasing radio frequency band is used, therefore, and radio interference (RadioFrequencyInterference, RFI) increasingly become the factor of serious puzzlement radio astronomy observation, even radio astronomical observation is brought detrimental effects.Radio interference mainly affects radio astronomy observation in the following aspects:
1. causing the saturation of receiver, if RFI is excessively strong in observation frequency range, the maximum input level exceeding any level element of analog receiver will result in the saturation of receiver.In that case, radio receiver cannot receive any astronomical signal；
2., due to the existence of SFDR (SpuriousFreeDynamicRange, the SFDR) parameter of analog-digital converter (Analogtodigitalconverter, ADC), can cause when RFI crosses strong that vacation is composed existing；
3. due to some defects of fft algorithm self, the frequency spectrum meeting of RFI signal and by window function and astronomical signal spectrum compose between interference, ultimately form false composing；And end unevenness of making an uproar can be caused, thus affect the relative calibration of radio astronomy signal；
4. RFI more than makes us determining the intermodulation distortion of frequency by the interaction generation in transmission medium, and the very difficult expectation of this interference also is difficult to be filtered by traditional method！
5. inside receiver, the modulating frequency that the RFI signal that (includes analog-and digital-mixing two kinds) during mixing and local oscillation signal produce, also it is easy to fall in radio astronomy observation simulation interested, has influence on normal astronomical signaling protein14-3-3 and analysis.
Interference eliminates the major issue having become as very urgent solution.The method evading RFI is adopted mainly to have following several at present:
1. " abandon " (blanking), two kinds can be divided into, one is to give up the frequency range that RFI is excessively strong, have the advantage that and inject to the equal state no interference signal of digital processing unit from analog receiver, two are to give up disturbing the observation data in stronger moment, and the interference (pulse-typesignal) especially for impulse type can effectively filter out；
2. " resistance " (shielding), by the way of radio interference frequency point setting wave trap (notchfilter) corresponding in receiver link can " block " RFI, advantage of this is that observation bandwidth loss is less, and cheap, if wave trap arranges rationally, likely obtain the frequency range of " pure "；
3. adopt spatial beams forming method (spatialbeamformingtechniques): include post processing secondary lobe interference cancellation techniques (postprocessingtechniquessidelobe-beamnulling) and radio interference is avoided in active spatial beams formation technology (adaptivebeam-formingtechniques)；
4. Digital matched filter technique (digitalmatchedfiltertechniques), utilize the performance that digital filter is good, make wave filter level off to wiener solution (wienersolution) and good squareness factor can be reached, reach to filter the purpose of radio interference.
5. " hide ", select the platform location of good radio environment.Such as, some large-scale radio telescopes such as FAST are by selecting excellent platform location and adopting radio frequency band protection to achieve evading of interference.So can avoid ground RFI；
To sum up, select the less area of radio interference when demonstration builds new large-scale radio telescope, and this area carries out long-term radio environment investigates is requisite means.
Simultaneously as the equipment such as LNA are easily subject to temperature impact, if this impact can be corrected in real time can improve test, the precision measured further.This is accomplished by an additional real-time calibration and controls system.
Summary of the invention
The purpose of the present invention is primarily adapted for use in the fields such as field radio environment measurement and the location prospecting of large-scale radio telescope platform, mainly solve field fast wireless electrical environment measuring table build, quickly carry out the work, the problem such as full-automatic measurement, there is installation simple and convenient, full-automatic measure, data are easy to the advantages such as management.
Technical scheme is as follows:
A kind of can the testing radio platform of self calibration, present invention is characterized in that by antenna and control module, signal receiving module and scaling module and be sequentially connected with and form, wherein:
Signal receiving module: connected audiofrequency spectrometer by low-noise amplifier and spectrum control computer forms；Antenna and control module thereof: be made up of test antenna, controlled turntable and turning table control computer；Scaling module: connected attached noise source respectively by microwave switch, 50 Ω matched loads, low-noise amplifier form, and noise source is also connected with controlling switch by control signal, controls to switch and is connected with microwave switch control computer；Described audiofrequency spectrometer controls computer, turning table control computer and microwave switch and controls computer one host computer of employing.
The present invention tests antenna rf delivery outlet, the input port 1 of microwave switch, the delivery outlet of microwave switch, wideband low noise amplifier input adopt coaxial fitting to be joined directly together and connect.
Being directly connected to 50 ohm of matched loads on the input port 2 of microwave switch of the present invention, input port 3 is directly connected with noise source delivery outlet by short coaxial cable, and it controls port and is connected with the output control terminal controlling card NI6509.
Test antenna is fixed on turntable by metal deck by the present invention, and main control computer controls turntable by RS232 agreement through long Serial Port Line.
Low-noise amplifier outfan of the present invention is connected with spectrum analyzer by long RF cable, and main control computer is connected with spectrum analyzer through netting twine by ICP/IP protocol.
According to above-mentioned a kind of can the method for testing of testing radio platform of self calibration, present invention is characterized in that when test, the radio environment situation of different azimuth is tested by turning table control, go backward through the control to microwave switch be sequentially ingressed into noise source and 50 Ω matched loads testing a side, by amplifier and audiofrequency spectrometer, these two kinds of signals are acquired, the gain situation of whole system up till now, the impact that elimination brings can be obtained due to environmental factorss such as temperature by the difference relationship between the excess noise ratio of known noise source and 50 Ω loads.
Inventive antenna passes through the parameters such as software design patterns antenna observed direction angle, and the residence time at each direction of observation angle.
Audiofrequency spectrometer of the present invention is by parameters such as software design patterns resolution bandwidth (RBW), observation bandwidth (span), center frequency point (centrefrequency), sweep time (sweeptime), average time (integratetime), number of scan points (points)；Display current spectral instrument grabgraf in real time；Automatically update after switching direction；Display figure includes two p-wires: maximum maintenance+real-time average.
The present invention is after program starts, and antenna automatic homing is to initial testing deflection, and spectrum analyzer is automatically tested frequency range from first and started to measure；One particular pitch angular direction and a special frequency channel are set to one group of measured value, after having measured this group, open microwave switch gating 50 ohm load and broadband noise source respectively, carry out system calibration test, be simultaneously generated two calibration test files；
The filename of record of the present invention is if observing data: be made up of successively the measurement parameter of several keys, and including the angle of pitch of antenna, azimuth, which tests frequency range and test date, it is provided that give the information that other users are detailed.If calibration data, filename is made up of following several parts: noise/50 Ω matchedload, the angle of pitch of antenna, azimuth, and which tests frequency range and test date, is conveniently used for inquiry noise source excess noise ratio parameter situation in this frequency range；
The present invention is connected to test antenna before sky line traffic control turntable, is sequentially connected to 4 and selects 1 microwave switch (and the 50 Ω matched loads being attached to, broadband noise source), wideband low noise amplifier, turning table control cable, radiofrequency signal cable between sky line traffic control turntable and main control computer；Wherein test antenna, sky line traffic control turntable, turning table control cable and main control computer and constitute antenna rotation control unit, play the purpose controlling measurement direction；Wideband low noise amplifier, radiofrequency signal cable, spectrum analyzer and main control computer constitute spectrum measurement and record unit；4 select 1 microwave switch and the 50 Ω matched loads, broadband noise source and the main control computer that are attached to constitute scaling unit.
Inventive antenna rotatable platform controls module settings and is accurate to the antenna pointing angle of 1 °, and is accurate to the residence time of every orientation angle of second level；Audiofrequency spectrometer controls module and have employed the audiofrequency spectrometer bsp driver that third party provides, and can be as accurate as second level simultaneously and remotely reads the ability of audiofrequency spectrometer data.
Record Monitoring Data of the present invention is being measured a particular pitch angular direction and a special frequency channel is one group, its filename is made up of successively the measurement parameter of several keys, including the angle of pitch of antenna, azimuth, which tests frequency range and test date, it is provided that give the information that other users are detailed, after the measurement of this group is complete, open microwave switch gating 50 ohm load and broadband noise source respectively, carry out system calibration test, be simultaneously generated two calibration test files；
Patent of the present invention adopts antenna automation control system+audiofrequency spectrometer limnograph system model, it is possible to automatically arrange measurement direction, every measurement direction residence time, testing channel, measuring accuracy etc..
The invention has the beneficial effects as follows:
Patent of the present invention has operation visualization, and data record is convenient, have self calibration function, simple to operate and be prone to the advantages such as field operation:
1. adopting modularized design, be divided into antenna control unit and Radiofrequency measuring unit two parts, two parts as independent control, measurement module, can not influence each other, and improves the stability of system, also allows for field operation simultaneously；
2. have employed and automatically control calibration scheme, at set intervals automated calibration system gain, improve the accuracy of test, simultaneity factor test file real-time storage, facilitate user to carry out the inquiry of current system situation；
3. all realization, Digital Control and the inputs on main control computer interface of audiofrequency spectrometer parameter setting, line traffic control interface, sky；
4. data file have employed filename recording mode clearly, it is possible to knows the every relevant parameter measuring file.
Accompanying drawing explanation
Fig. 1 patent overall structure of the present invention illustrates figure；
Fig. 2 audiofrequency spectrometer controls program flow diagram；
Fig. 3 antenna rotating platform controls program flow diagram；
Fig. 4 patent surveying record filename of the present invention is constituted；
Fig. 5 patent calibration log file name of the present invention is constituted.
Detailed description of the invention
As it is shown in figure 1, a kind of can the testing radio platform of self calibration, present invention is characterized in that by antenna and control module, signal receiving module and scaling module and be sequentially connected with and form, wherein:
Signal receiving module: connected audiofrequency spectrometer by low-noise amplifier and spectrum control computer forms；Antenna and control module thereof: be made up of test antenna, controlled turntable and turning table control computer；Scaling module: connected attached noise source respectively by microwave switch, 50 Ω matched loads, low-noise amplifier form, and noise source is also connected with controlling switch by control signal, controls to switch and is connected with microwave switch control computer；Described audiofrequency spectrometer controls computer, turning table control computer and microwave switch and controls computer one host computer of employing.
The present invention tests antenna rf delivery outlet, the input port 1 of microwave switch, the delivery outlet of microwave switch, wideband low noise amplifier input adopt coaxial fitting to be joined directly together and connect.
Being directly connected to 50 ohm of matched loads on the input port 2 of microwave switch of the present invention, input port 3 is directly connected with noise source delivery outlet by short coaxial cable, and it controls port and is connected with the output control terminal controlling card NI6509.
Test antenna is fixed on turntable by metal deck by the present invention, and main control computer controls turntable by RS232 agreement through long Serial Port Line.
Low-noise amplifier outfan of the present invention is connected with spectrum analyzer by long RF cable, and main control computer is connected with spectrum analyzer through netting twine by ICP/IP protocol.
According to above-mentioned a kind of can the method for testing of testing radio platform of self calibration, present invention is characterized in that when test, the radio environment situation of different azimuth is tested by turning table control, go backward through the control to microwave switch be sequentially ingressed into noise source and 50 Ω matched loads testing a side, by amplifier and audiofrequency spectrometer, these two kinds of signals are acquired, the gain situation of whole system up till now, the impact that elimination brings can be obtained due to environmental factorss such as temperature by the difference relationship between the excess noise ratio of known noise source and 50 Ω loads.
Inventive antenna passes through the parameters such as software design patterns antenna observed direction angle, and the residence time at each direction of observation angle.
Audiofrequency spectrometer of the present invention is by parameters such as software design patterns resolution bandwidth (RBW), observation bandwidth (span), center frequency point (centrefrequency), sweep time (sweeptime), average time (integratetime), number of scan points (points)；Display current spectral instrument grabgraf in real time；Automatically update after switching direction；Display figure includes two p-wires: maximum maintenance+real-time average.
The present invention is after program starts, and antenna automatic homing is to initial testing deflection, and spectrum analyzer is automatically tested frequency range from first and started to measure；One particular pitch angular direction and a special frequency channel are set to one group of measured value, after having measured this group, open microwave switch gating 50 ohm load and broadband noise source respectively, carry out system calibration test, be simultaneously generated two calibration test files；
The filename of record of the present invention is made up of successively the measurement parameter of several keys, and including the angle of pitch of antenna, azimuth, which tests frequency range and test date, it is provided that give the information that other users are detailed.
The present invention is connected to test antenna before sky line traffic control turntable, is sequentially connected to 4 and selects 1 microwave switch (and the 50 Ω matched loads being attached to, broadband noise source), wideband low noise amplifier, turning table control cable, radiofrequency signal cable between sky line traffic control turntable and main control computer；Wherein test antenna, sky line traffic control turntable, turning table control cable and main control computer and constitute antenna rotation control unit, play the purpose controlling measurement direction；Wideband low noise amplifier, radiofrequency signal cable, spectrum analyzer and main control computer constitute spectrum measurement and record unit；4 select 1 microwave switch and the 50 Ω matched loads, broadband noise source and the main control computer that are attached to constitute scaled identity
Inventive antenna rotatable platform controls module settings and is accurate to the antenna pointing angle of 1 °, and is accurate to the residence time of every orientation angle of second level；Audiofrequency spectrometer controls module and have employed the audiofrequency spectrometer bsp driver that third party provides, and can be as accurate as second level simultaneously and remotely reads the ability of audiofrequency spectrometer data.
Record Monitoring Data of the present invention is being measured a particular pitch angular direction and a special frequency channel is one group, its filename is made up of successively the measurement parameter of several keys, including the angle of pitch of antenna, azimuth, which tests frequency range and test date, it is provided that give the information that other users are detailed, after the measurement of this group is complete, open microwave switch gating 50 ohm load and broadband noise source respectively, carry out system calibration test, be simultaneously generated two calibration test files；Calibration test filename is made up of following several parts: noise/50 Ω matchedload, the angle of pitch of antenna, azimuth, and which tests frequency range and test date, is conveniently used for inquiry noise source excess noise ratio parameter situation in this frequency range；
Patent of the present invention adopts antenna automation control system+audiofrequency spectrometer limnograph system model, it is possible to automatically arrange measurement direction, every measurement direction residence time, testing channel, measuring accuracy etc..
Wherein audiofrequency spectrometer controls computer, turning table control computer and microwave switch control computer is a master control host computer.And the control program being integrated in master control computer includes real-time antenna rotatable platform and controls and audiofrequency spectrometer two submodules of control, wherein real-time antenna rotatable platform controls module and issues current orientation, pitch value by serial ports to antenna rotating platform, audiofrequency spectrometer is controlled module and is connected with audiofrequency spectrometer by master control computer by netting twine and has the observed parameter arranging control audiofrequency spectrometer, read the function of observation data, master control computer controls the gated fashion of microwave switch simultaneously, and completion system is calibrated.
As shown in Figure 2, a kind of can the program circuit of spectrum analyzer control part of the testing radio platform of self calibration and method of testing thereof be in that: first program carries out the initial configuration of spectrum analyzer and include arranging initialized center frequency point after starting, observation frequency range and incremental step thereof, scan mode (continuously scanning or single sweep operation), resolution bandwidth (ResolutionBandwidth, RBW), video bandwidth (VideoBandwidth, VBW), sweep time, reference level value, quantization unit, wherein observing frequency range and incremental step thereof and scan mode setting respectively, sweep time and reference level value are inserted 5 seconds between arranging and are postponed to respond so that spectrum analyzer has ample time；Then three measurement displays, call wires are set and represent the instantaneous value of measurement, meansigma methods and maximum respectively；Arrangement above proceeds by measurement after completing.Measurement procedure is as follows: adopts circulation measurement pattern in the measurements, arranges a timing module timing, program asks whether to reach the measurement time, as being not reaching to continue to measure；If reaching record three to measure the data of line, then jumping out circulation, opening calibration mode.
The order of calibration mode is: microwave switch gating 50 Ω matched load respectively, noise source, to signal link, obtain two kinds of frequency spectrum datas accessing signal by audiofrequency spectrometer collection.
After calibration mode terminates, in the center frequency point arranging next observation frequency range according to the incremental step of observation frequency range, after being provided with, go successively to measurement circulation.After all measurement frequency range has been measured, notice sky line traffic control Program transformation measures angle.
As shown in Figure 3, a kind of can the program circuit of antenna rotating platform control part of the testing radio platform of self calibration and method of testing thereof be in that: first program carries out the initial configuration of antenna rotating platform and arrange serial ports parameter after starting, day ray examination angle measurement turntable whether normal operation is set, antenna initial monitor angle is set and sends antenna with regard to bit instruction to spectrum analyzer control software design after this angle of antenna direction after confirming antenna normal operation, then wait that spectrum analyzer controls the channel measurement END instruction that program is sent, next antenna bearingt measuring direction is read in this instruction after arriving, pitch value, send with regard to bit instruction to spectrum analyzer control software design after antenna is in place.
Claims (10)
1. one kind can the testing radio platform of self calibration, it is characterised in that: by antenna and control module, signal receiving module and scaling module and be sequentially connected with and form；Wherein:
Signal receiving module: connected audiofrequency spectrometer by low-noise amplifier and spectrum control computer forms；Antenna and control module thereof: be made up of test antenna, controlled turntable and turning table control computer；Scaling module: connected attached noise source respectively by microwave switch, 50 Ω matched loads, low-noise amplifier form, and noise source is also connected with controlling switch by control signal, controls to switch and is connected with microwave switch control computer；Described audiofrequency spectrometer controls computer, turning table control computer and microwave switch and controls computer one host computer of employing.
2. according to claim 1 a kind of can the testing radio platform of self calibration, it is characterized in that, test antenna rf delivery outlet, the input port 1 of microwave switch, the delivery outlet of microwave switch, wideband low noise amplifier input adopt coaxial fitting to be joined directly together and connect.
3. according to claim 1 a kind of can the testing radio platform of self calibration, it is characterized in that, the input port 2 of microwave switch is directly connected to 50 ohm of matched loads, input port 3 is directly connected with noise source delivery outlet by short coaxial cable, and it controls port and is connected with the output control terminal controlling card NI6509.
4. according to claim 1 a kind of can the testing radio platform of self calibration, it is characterised in that being fixed on turntable by metal deck by test antenna, main control computer controls turntable by RS232 agreement through long Serial Port Line.
5. according to claim 1 a kind of can the testing radio platform of self calibration, it is characterised in that low-noise amplifier outfan is connected with spectrum analyzer by long RF cable, and main control computer passes through ICP/IP protocol and is connected with spectrum analyzer through netting twine.
6. according to claim 1 a kind of can the method for testing of testing radio platform of self calibration, it is characterized in that: when test, the radio environment situation of different azimuth is tested by turning table control, go backward through the control to microwave switch be sequentially ingressed into noise source and 50 Ω matched loads testing a side, by amplifier and audiofrequency spectrometer, these two kinds of signals are acquired, the gain situation of whole system up till now, the impact that elimination brings can be obtained due to environmental factorss such as temperature by the difference relationship between the excess noise ratio of known noise source and 50 Ω loads.
7. according to claim 1 a kind of can the method for testing of testing radio platform of self calibration, it is characterised in that antenna passes through the parameters such as software design patterns antenna observed direction angle, and the residence time at each direction of observation angle.
8. according to claim 1 a kind of can the method for testing of testing radio platform of self calibration, it is characterized in that, audiofrequency spectrometer is by parameters such as software design patterns resolution bandwidth (RBW), observation bandwidth (span), center frequency point (centrefrequency), sweep time (sweeptime), average time (integratetime), number of scan points (points)；Display current spectral instrument grabgraf in real time；Automatically update after switching direction；Display figure includes two p-wires: maximum maintenance+real-time average.
9. a kind of according to claim 6 or 7 can the method for testing of testing radio platform of self calibration, it is characterised in that after program starts, antenna automatic homing is to initial testing deflection, and spectrum analyzer is automatically tested frequency range from first and started measurement；One particular pitch angular direction and a special frequency channel are set to one group of measured value, after having measured this group, open microwave switch gating 50 ohm load and broadband noise source respectively, carry out system calibration test, be simultaneously generated two calibration test files.
10. according to claim 1 a kind of can the method for testing of testing radio platform of self calibration, it is characterized in that, the filename recorded is made up of successively the measurement parameter of several keys, including the angle of pitch of antenna, azimuth, which tests frequency range, and test date, it is provided that give the information that other users are detailed.
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