CN101562485B - Ku frequency band and multicarrier time-division multiple access satellite signal monitoring method - Google Patents
Ku frequency band and multicarrier time-division multiple access satellite signal monitoring method Download PDFInfo
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- CN101562485B CN101562485B CN2009100854684A CN200910085468A CN101562485B CN 101562485 B CN101562485 B CN 101562485B CN 2009100854684 A CN2009100854684 A CN 2009100854684A CN 200910085468 A CN200910085468 A CN 200910085468A CN 101562485 B CN101562485 B CN 101562485B
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Abstract
The invention provides a Ku frequency band and multicarrier time-division multiple access satellite signal monitoring method, which is realized by the following steps: 1, inputting theoretical values of satellite signals in a system; 2, leading the satellite signals with the Ku frequency band by three paths; 3, completing signal modulation and generating synchronizing pulse by a synchronizing signal generator; 4, changing the signals from the Ku frequency band to zero intermediate frequency by a down convertor to obtain single channel signals and input the single channel signals into an oscillograph; 5, adjusting parameter setting by a real time frequency spectrograph to complete a channel for down-conversion; 6, triggering the oscillograph and the real time frequency spectrograph to sample the signals; 7, reading a time domain characteristic graph of the channel from the oscillograph by control software; 8, inputting the start time and duration of each time slot in turn into the realtime frequency spectrograph by the control software; 9, comparing the theoretical value of each time slot with a measured value; 10, completing the storage of information according to an actual monitoring state; and 11, adjusting the setting of the down convertor and the real time frequency spectrograph, repeating the steps from 4 to 10, and completing the signal monitoring of any channel.
Description
(1) technical field
The present invention relates to a kind of signal monitoring method, relate in particular to a kind of Ku frequency range, multicarrier time-division multiple access (MF-TDMA) satellite signal monitoring method, belong to the satellite-signal monitoring technical field.
(2) background technology
Along with the fast development of national economy, satellite communication has obtained using more and more widely.Satellite company relies on the communication satellite that has to provide satellite communications services to various circles of society.Coverage is large, real-time good, be affected by human factors the characteristics such as little because satellite communication possesses, thereby has obtained the extensive use of every profession and trades such as civil aviaton, sea-freight, public security, fire-fighting, radio and television.
Ku frequency range, multicarrier time-division multiple access (MF-TDMA) satellite communication system are current use communication systems very widely.The Ku frequency range is the frequency range that current communication satellite the most often uses, satellite company many with the Ku frequency range according to a plurality of little frequency ranges of certain regular partition, and provide the user to use in the mode of renting.The user can rent according to service needed the frequency spectrum of certain bandwidth, and pays according to frequency bandwidth.The user be to improve the service efficiency of frequency band after renting the frequency band of certain width, adopt the method for multicarrier time-division multiple access (MF-TDMA) that frequency band is carried out multiplexing, to improve the utilance of frequency spectrum more.Multicarrier refers to frequency band is divided into different passages from frequency, and every passage uses independently carrier wave; Time division multiple access is divided into some time slots with one section call duration time exactly, transmits different business datums at different time slots.
The user is after renting the passage of certain bandwidth, and satellite company must guarantee user's communication quality, and communication quality generally with the ratio of signal power and noise power, namely recently weigh by noise.In the real satellite communication process, the signal to noise ratio of each time slot is the index that satellite company and user very are concerned about.
The unification frequency band monitoring methods that adopt of satellite-signal monitoring are at present namely only unified monitoring to the frequency spectrum of certain bandwidth, and are not goed deep into each communication time slot more, and the general signal to noise ratio of frequency band of thinking is equal to the signal to noise ratio of each time slot.Actual conditions are really not so, and the signal to noise ratio on identical frequency band between different time-gap is discrepant, and these differences are enough to determine whether communication link can be set up smoothly.Set up that a kind of can to carry out the method for monitoring to each time slot of satellite communication be very necessary, it can provide sound assurance for the satellite data communication of satellite user.
(3) summary of the invention
1, purpose: the purpose of this invention is to provide a kind of Ku frequency range, multicarrier time-division multiple access satellite signal monitoring method, it can complete the quality-monitoring of each communication time slot in time division multiple access satellite communication system.
2, summary of the invention: the invention provides a practical satellite communication frequency spectrum monitoring system of cover, comprising: the general monitor device, can complete the monitoring of a certain index of satellite communication signal, and provide standard network interface to upper strata control software, for its Long-distance Control; Control software, control lower floor's monitoring instrument, carry out computing and operation according to certain step, show the result of monitoring to the user in the mode of figure, and complete the record of result.
In above-mentioned satellite communication frequency spectrum monitoring system, the general monitor device comprises: Real-time Spectrum Analyzer, can record the spectrum information of certain hour section, certain frequency bandwidth, and analyze the signal to noise ratio of signal in the random time sheet; The synchronizing signal maker separates the synchronizing information in the satellite communication signal, determines the time started of a timeslice; Low-converter can be down-converted to zero intermediate frequency with the signal of Ku wave band, but the low-pass filtering of while settling signal; Oscilloscope, the time domain specification of display in real time.
In above-mentioned satellite communication frequency spectrum monitoring system, each all purpose instrument is controlled software RCI is provided to the upper strata by Ethernet.
In above-mentioned satellite communication frequency spectrum monitoring system, control software and comprise that theoretical time slot arranges typing module, satellite spectrum signal separation module, comparing module and data record and analysis module.
In above-mentioned satellite communication frequency spectrum monitoring system, the theoretical time slot arrangement typing module of controlling software is that the user arranges the module of basal conditions to the control software specification current time slots.Before monitoring, the user need to provide the theoretical value of each time slot base attribute in communication and the deviation that allows thereof, and base attribute comprises the contents such as time slot time started, time slot width, signal center frequency, signal power, Signal-to-Noise.
In above-mentioned satellite communication frequency spectrum monitoring system, the time slot that the star spectrum signal separation module of control software can utilize lower floor's all purpose instrument to complete signal in certain bandwidth separates.Communication time slot after after separation comprises the measured value of the base attributes such as time slot time started, time slot width, signal center frequency, signal power, Signal-to-Noise.
In above-mentioned satellite communication frequency spectrum monitoring system, control the comparing module of software and mainly complete the measured value of monitored signal and the comparison of theoretical value, observe measured value whether within the deviation range that theoretical value allows.If all base attributes of certain time slot all do not surpass the scope of theoretical value, this time slot communication is normal, otherwise undesired, need to monitor alarm to the user.
In above-mentioned satellite communication frequency spectrum monitoring system, control the data record of software and the record that analysis module is completed monitoring information, for the time slot of alarm, need the complete information such as content that record alarm time, alarm, and the interface of user's subsequent query and analysis is provided.
In sum, the present invention is a kind of Ku frequency range, multicarrier time-division multiple access satellite signal monitoring method, and the method concrete steps are as follows:
Step 1: the user is with the theoretical value input system of all time slot base attributes of satellite-signal;
Step 2: Ku frequency range satellite-signal draws and connects, and is divided into 3 the tunnel, accesses respectively synchronizing signal maker, Real-time Spectrum Analyzer and low-converter;
Step 3: the demodulation of synchronizing signal maker settling signal, and produce lock-out pulse;
Step 4: low-converter is converted to zero intermediate frequency with certain channel signal from the Ku wave band, and the settling signal low-pass filtering, obtains single channel (being single carrier) signal, and its input oscilloscope;
Step 5: Real-time Spectrum Analyzer is adjusted the parameter setting, on the Ku wave band, directly aims at completing the passage of down-conversion in step 4;
Step 6: trigger oscilloscope and Real-time Spectrum Analyzer signal is sampled;
Step 7: control software and read this passage time domain specification figure from oscilloscope, and separate each time slot according to time-domain diagram, obtain time started and the duration of time slot;
Step 8: control software time started and the duration of each time slot are inputted Real-time Spectrum Analyzer successively, and read the base attribute of input time slot from Real-time Spectrum Analyzer, thereby obtain measured value;
Step 9: theoretical value and the measured value of each time slot base attribute are compared, when appearance is abnormal, complete alarm;
Step 10: complete the storage of information according to the actual monitoring state;
Step 11: adjust low-converter and Real-time Spectrum Analyzer setting, repeating step four can be completed the signal monitoring of any passage to step 10.
3, advantage and effect: from above description, can find out, the satellite communication frequency spectrum monitoring system that the above-mentioned embodiment of the present invention provides can be monitored the Ku wave band accurately, the communication quality of each communication time slot in multicarrier time-division multiple access (MF-TDMA) satellite communication system, realized following technique effect: can be to the Ku wave band, each communication time slot in the satellite communication system of multicarrier time-division multiple access (MF-TDMA) carries out independent monitoring, obtain the time started of communication time slot, time slot width, signal center frequency, signal power, the base attributes such as Signal-to-Noise.
(1) with real-time the comparing with theoretical value of the measured value of communication time slot base attribute, when going beyond the scope, completes measured value the alarm to the user.
(2) each state in can real time record spectrum monitoring process is for subsequent analysis.
(4) description of drawings
The satellite-signal schematic diagram of the required monitoring of Fig. 1 satellite communication frequency spectrum monitoring system;
The basic frame structure schematic diagram of Fig. 2 satellite communication frequency spectrum monitoring system;
Fig. 3 satellite communication frequency spectrum monitoring system internal structure schematic diagram;
The main testing process block diagram of Fig. 4 satellite communication frequency spectrum monitoring system.
In figure, symbol description is as follows:
10 reception antennas; 20 instrument and equipments; 21 synchronizing signal makers; 22 low-converters; 23 oscilloscopes; 24 Real-time Spectrum Analyzer; 30 main control devices; 31 main control computers; 32 database servers; 40 cables; 50 networks; 100 aviation management Sound Monitoring Systems.
(5) embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 1 shows the essential characteristic of satellite frequency spectrum of the required monitoring of satellite communication frequency spectrum monitoring system of one embodiment of the invention, and is specific as follows:
The channel of the Ku wave band 54MHz bandwidth that user's leased satellite company provides, at first the user carries out channel multiplexing on frequency, the 54MHz bandwidth is divided into 20 passages, each passage 2.7MHz, each passage adopts independently carrier wave, represents with the longitudinal axis in Fig. 1.then adopt again the mode of time division multiple access (TDMA) to carry out multiplexing on each passage, carry out the time-division take 20ms as the cycle, arrange the different time slot of width within the cycle of 20 milliseconds, the data that each time slot can be completed given pace transmit, the capacity that transmits is decided by the width of time slot, in Fig. 1 with the direction indication of transverse axis, each filling block in each passage on transverse axis represents a time slot, time slot can be planned any arrangement according to the user, keep the protection interval of 6us between each time slot, time slot shown in Fig. 1 is schematic diagram, not quite identical with actual measurement system.
As can be seen from Figure 1, the signal of this example monitoring is typical Ku wave band, multicarrier time-division multiple access (MF-TDMA) signal.
Fig. 2 shows the basic framework figure of satellite communication frequency spectrum monitoring system according to an embodiment of the invention, and as shown in the figure, aviation management Sound Monitoring System 100 comprises:
Instrument and equipment 20, general monitoring instrument, the drawing of satellite-signal of completing reception antenna 10 receptions connects and separates;
Cable 40 adopts coaxial cable, and settling signal drawing from the antenna to the instrument and equipment connects;
Network 50, Ethernet is used and is connected main control device 30 and instrument and equipment 20, makes instrument and equipment 20 receive Long-distance Control and the operation of main control device 30.
Can find out, this embodiment adopts C/S (Client/Server client computer/service end) structure, makes the user only by main control device 30, just can complete the complete monitoring of satellite-signal.
Fig. 3 shows the satellite communication frequency spectrum monitoring system internal structure of embodiment according to an embodiment of the invention, and is specific as follows:
The direct receiving satellite signal of reception antenna 10, and the spectrum signal of Ku frequency range is directly accessed native system, transmit to follow-up system by coaxial cable for high frequency;
Instrument and equipment 20 comprises: synchronizing signal maker 21, for separating of the synchronizing information in the Ku frequency band signals, for follow-up provides time synchronized; Low-converter 22 is used for Ku wave band high-frequency signal is changed to zero intermediate frequency, completes simultaneously low-pass filtering, the different passages of separate users definition from the frequency domain; Oscilloscope 23, the time-domain information of certain passage under the demonstration user defines, and provide this channel signal sampling figure to main control computer 31; Real-time Spectrum Analyzer 24 gathers the Ku frequency range, completes the function that frequency spectrum record and time slot base attribute are calculated.
According to above-described embodiment, provided a kind of specific implementation of this Ku wave band.
Particularly, the user adopts 4.5 meters bore reception antennas 10 to receive Ku frequency range satellite frequency spectrum satellite, native system monitoring 54MHz bandwidth (being divided into 20 passages, every passage 2.7MHz) wherein.
The spectrum information of Ku frequency range is introduced respectively 3 instruments in instrument and equipment 20, be respectively: 1) synchronizing signal maker, employing PolarSat company product, model is VISA Plus II, can complete the signal demodulation of Ku wave band, extract synchronizing information wherein, output 20ms is the lock-out pulse in cycle, for oscilloscope 23 and Real-time Spectrum Analyzer 24 provide the synchronous acquisition pulse; 2) low-converter 21, are independently developed product, Ku frequency range satellite-signal can be converted to zero intermediate frequency, are convenient to the data acquisition of follow-up oscilloscope 23 equipment, and also signal being completed bandwidth simultaneously is the 2.7MHz low-pass filtering, to separate the signal of each passage; 3) Real-time Spectrum Analyzer 24, adopt Imtech's product, model is RSA6106A, can complete record and the analysis of frequency spectrum, externally after the information such as designated center, signal bandwidth, time slot time started, time slot width, this equipment can be completed the calculating of this time slot base attribute.
Oscilloscope 23 is completed the collection of certain passage time domain specification, adopts Imtech's product, and model is DP07104.Under the driving of synchronizing signal maker, oscilloscope 23 and Real-time Spectrum Analyzer 24 gather signal simultaneously, the length of a timeslice of time remaining, i.e. 20ms.
The main control computer 31 that main control device 30 comprises adopts the general commercial computer, main control computer is installed main control software, main control software is undertaken work such as monitoring process organization, calculation of parameter, comparing, data storage, it is the actual operating part of this signal monitoring method, main control software adopts Visual Studio 2005 to write, and the Long-distance Control and the data that adopt VISA Library instrument and equipment interface library to complete oscilloscope 23 and Real-time Spectrum Analyzer 24 read.Data server 32 provides data storage service, the 6850 type servers that adopt Dell to produce, and operation Windows 2003 Server, database adopts SQL Server 2005.
Fig. 4 shows the main testing process of satellite communication frequency spectrum monitoring system according to an embodiment of the invention, has described the key step how this example monitors Ku wave band, multicarrier time-division multiple access (MF-TDMA) satellite-signal.The present invention is a kind of Ku frequency range, multicarrier time-division multiple access satellite signal monitoring method, and the method concrete steps are as follows:
Step 2 after monitoring system is ready to complete, is opened reception antenna, and Ku wave band, multicarrier time-division multiple access (MF-TDMA) signal are drawn the access test macro;
Step 3,21 pairs of Ku band signal of synchronizing signal maker are carried out demodulation, extract synchronizing information, and export in the mode of pulse;
Step 4, main control software Long-distance Control down-conversion 22 on main control computer 31, make the centre frequency of its down-conversion centre frequency aligned with channel 0, and signal is carried out the low-pass filtering of 2.7MHz after down-conversion, passage 0 signal is completed with other channel signals separated, and export 0 channel signal to oscilloscope 23;
Step 5, the main control software Long-distance Control Real-time Spectrum Analyzer 24 on main control computer 31 makes the centre frequency of its centre frequency aligned with channel 0, and filtering bandwidth is set to 2.7MHz simultaneously.Its signal to passage 0 is gathered;
Step 6, under the triggering of the lock-out pulse that synchronizing signal maker 21 generates, oscilloscope 23 and Real-time Spectrum Analyzer 24 are carried out signals collecting simultaneously, complete data record;
Step 7, the main control software on main control computer 31 be from the long-range oscilloscope sample graph that reads of oscilloscope 23, and the time slot that carries out signal separates, and concrete operations are as follows: 1) oscilloscope is read and ask for power envelope when prepass when the 20ms of prepass sampling sampling point; 2) to the further filtering of 20ms power envelope figure when prepass, the amplitude that rises and falls to reduce signal envelope is so that the follow-up time slot search that carries out improves accuracy; 3) take the method for simple gate limit random-walk filtering to carry out time slot search.When time slot is differentiated, for reducing erroneous judgement, designed a random-walk filtering device in process software.Require after certain sampled point is less than thresholding, must guarantee continuous R10 and put all lower than thresholding, just think really to have occured from signal being arranged to the saltus step of no signal; When becoming higher than thresholding lower than thresholding, R01 sampled point can be confirmed continuously, has the time between signal and no signal to be a time slot simultaneously.
Step 8, main control computer 31 is inputted respectively Real-time Spectrum Analyzer 24 with time started and the duration of the time slot separated, and Real-time Spectrum Analyzer 24 obtains out the measured value of each time slot base attribute according to input, and value is sent to main control computer 31;
Step 11, main control software Long-distance Control down-conversion 22 on main control computer 31, make its down-conversion centre frequency aim at the centre frequency of next passage to be measured, Long-distance Control Real-time Spectrum Analyzer 24, make its centre frequency aim at the centre frequency of next passage to be measured simultaneously.
As can be seen from the above description, the real satellite communication frequency spectrum monitoring system that the present invention is above-mentioned can carry out signal monitoring to the satellite communication system of Ku wave band, multicarrier time-division multiple access (MF-TDMA), has realized following technique effect:
1, by the multiple measuring instrument of Collaborative Control, automatically realize accurately separating all communication time slots in multicarrier, TDMA communication system, and complete the measurement of the base attributes such as time started, time slot width, signal center frequency, signal power, Signal-to-Noise of each time slot.
2, the actual measured value of the base attribute of each time slot is compared with theoretical value, when gap the base attribute actual measured value occurs and exceeds the theoretical value scope at a time, send the monitoring abnormality alarming to the user.
3, take the scheme that the alarm time slot is stored entirely, normal slot timing is stored, record the spectrum monitoring process, for user's subsequent analysis.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, perhaps they are made into respectively each integration module, perhaps a plurality of modules in them or step are made into individual module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (1)
1. a Ku frequency range, multicarrier time-division multiple access satellite signal monitoring method, it is at the general monitor device that is comprised of Real-time Spectrum Analyzer, synchronizing signal maker, low-converter, oscilloscope and comprises on the satellite communication frequency spectrum monitoring system that control software that theoretical time slot arranges typing module, satellite spectrum signal separation module, comparing module, data record and analysis module to form consisted of jointly and realizing, it is characterized in that:
The method concrete steps are as follows:
Step 1: the user is with the theoretical value input system of all time slot base attributes of satellite-signal;
Step 2: Ku frequency range satellite-signal draws and connects, and is divided into 3 the tunnel, accesses respectively synchronizing signal maker, Real-time Spectrum Analyzer and low-converter;
Step 3: the demodulation of synchronizing signal maker settling signal, and produce lock-out pulse;
Step 4, control remote software on computer is controlled down-conversion, makes the down-conversion centre frequency aim at the centre frequency of certain passage, and after down-conversion, signal is carried out low-pass filtering, certain channel signal is separated with other channel signals, and export certain channel signal to oscilloscope;
Step 5, the control remote software on computer is controlled Real-time Spectrum Analyzer, makes the centre frequency of passage described in centre frequency alignment procedures four, and filtering bandwidth is set to 2.7MHz simultaneously, and its signal to passage described in step 4 is gathered;
Step 6: trigger oscilloscope and Real-time Spectrum Analyzer signal is sampled;
Step 7: control software and read this passage time-domain diagram from oscilloscope, and separate each time slot according to time-domain diagram, obtain time started and the duration of time slot;
Step 8: control software time started and the duration of each time slot are inputted Real-time Spectrum Analyzer successively, and read the base attribute of input time slot from Real-time Spectrum Analyzer, thereby obtain measured value;
Step 9: theoretical value and the measured value of each time slot base attribute are compared, when appearance is abnormal, complete alarm;
Step 10: complete the storage of information according to the actual monitoring state;
Step 11: adjust low-converter and Real-time Spectrum Analyzer setting, repeating step four is completed the signal monitoring of any passage to step 10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101867381B (en) * | 2010-05-14 | 2013-04-10 | 安徽白鹭电子科技有限公司 | Method for realizing down conversion of radio frequency spectrometer by narrow-band local oscillation and switch filtering |
| CN103973384B (en) * | 2014-05-21 | 2016-06-15 | 河北神舟卫星通信股份有限公司 | A kind of satellite earth station carrier wave dynamic monitoring system |
| CN105703788B (en) * | 2016-03-08 | 2017-12-12 | 广州易迩达电子有限公司 | The low noise block downconverter and satellite receiving system used suitable for multiple-link satellite receiver |
| CN112087251B (en) * | 2020-07-21 | 2022-05-27 | 中国电子科技集团公司第七研究所 | Ultra-wideband satellite communication carrier monitoring system |
| CN111970069B (en) * | 2020-08-18 | 2022-06-21 | 成都爱科特科技发展有限公司 | Satellite signal x and ku frequency band spectrum monitoring sensor and monitoring method |
| CN112731083A (en) * | 2020-12-28 | 2021-04-30 | 南京三乐集团有限公司 | High-throughput satellite K-waveband space traveling wave tube multistage depressed collector micro-discharge detection method |
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