CN103618889B - For the digital intermediate frequency module of satellite TV signal monitoring system - Google Patents
For the digital intermediate frequency module of satellite TV signal monitoring system Download PDFInfo
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Abstract
A kind of digital intermediate frequency device for satellite TV signal monitoring system, it is characterized in that: formed by the digital down converter connecting successively, digital detector and abnormal alarm device, each several part be all the XC5VSX95T of Xilinx company complete in 1FF1136 model FPGA, digital down converter input ADC sampled data, after sampling, the centre frequency of data signal is at intermediate-frequency band, after input digital down converter, first through digital local oscillator (NCO), signal spectrum is moved to base band, then reduce the data transfer rate of data signal through down-sampled filter circuit; The two-way baseband signal I (n), the Q (n) that obtain through digital down converter processing input digital detector; Digital detector is made up of the envelope detection circuit connecting successively, video filtering circuit and video detecting circuit, the rectified signal that digital detector obtains after processing is inputted abnormal alarm device on the one hand, abnormal satellite TV signal is carried out to monitoring, alarming, show through interface input upper strata main frame on the other hand.
Description
Technical field
The present invention relates to a kind ofly can to complete all band signal monitoring, note abnormalities report to the police for satellite TV signal monitoring systemDigital intermediate frequency module.
Technical background
In recent years, satellite radio television technology with the feature of its " omnipresent " and " directly user oriented " in satellite television industryThe fields such as business, mobile-satellite service, internet access, dedicated network, military communication are developed rapidly, and telecommunication satellite existsIn kind, quantity, frequency range and message capacity, keep increasing. Satellite radio television signal transmits in satellite communication link, easilyBe subject to the impact that meteorological and astronomical geography etc. change, be also likely subject to other communication apparatus signals or artificial premeditated interference simultaneously,For example hostile force, for disturbing China's satellite television to broadcast, illegally occupies the behavior of intercutting of broadcast television signal frequency range. On the other hand,Monitoring center is as the First Line post of the department of broadcast, and operator on duty needs this root string of tight safety always, fulfils in earnest in a down-to-earth manner certainlyOneself responsibility, eliminates paralysis absent-mindedness, has realized the highest requirement of safe broadcast " not only economy but also safety, high-quality, uninterrupted ",This just must pay close attention to when satellite television receives signal for 24 hours also will take into account many playing device duties, on dutyIntensity is very large. The development of satellite broadcasting television system, is broadcasting channel, frequency and is constantly increasing on broadcast time, to extensivelyWorkload and the work difficulty of broadcasting television broadcasting have all proposed requirements at the higher level, and improving satellite radio television signal monitoring system becomes urgentThe demand of cutting.
Satellite radio television signal monitoring is actually a relatively wide in range concept, and its content only has description qualitatively, without definitely fixedDefining of amount, monitoring equipment is more according to customer demand customization, and therefore, systematization in industry, standardization level are not high,Radio and television broadcasting agency, advertiser, program provider etc. enter some interested abnormal signals according to self-demand oftenRow combination monitoring, thereby the project organization otherness of system is very large. Under this background, monitoring does not form systemTechnology, product class.
For completing the monitoring to satellite radio television signal, first monitoring equipment needs all band radiofrequency signal to carry out spectrum analysis.Traditional frequency sweep spectrum analyzer circuit adopts super-heterodyne architecture, though there is very high measurement dynamic range, can only sweep by measuring-signalRetouch the amplitude spectrum in frequency range, lack the measurement capability of the phase information to signal. Meanwhile, traditional frequency sweep spectrum analysis sideMethod is to realize by the scanning of local oscillation signal, is a kind of method of non real-time property, and measured signal can only be cycle stabilitySignal, lacks measurement capability to strong signal sudden and high transition.
Summary of the invention
Technical problem to be solved by this invention, is just to provide a kind of digital intermediate frequency module for satellite TV signal monitoring system,Meet the demand that different clients monitor different abnormal signals; On the other hand, monitoring system is carried out all band frequency spectrum to signalWhen analysis, the amplitude spectrum of broadband signal not only can be provided, and measurement can be made to the phase information of measured signal.
Solve the problems of the technologies described above, the technical solution used in the present invention is:
For a digital intermediate frequency device for satellite TV signal monitoring system, it is characterized in that: by the digital down converter connecting successively,Digital detector and abnormal alarm device composition, each several part be all the XC5VSX95T of Xilinx company ?1FF1136 model FPGAIn complete, digital down converter input ADC sampled data, after sampling, the centre frequency of data signal is at intermediate-frequency band, defeatedAfter entering digital down converter, first through digital local oscillator (NCO), signal spectrum is moved to base band, then reduce through down-sampled filter circuitThe data transfer rate of data signal; The two-way baseband signal I (n), the Q (n) that obtain through digital down converter processing input digital detector;Digital detector is made up of the envelope detection circuit connecting successively, video filtering circuit and video detecting circuit, digital detector placeThe rectified signal obtaining after reason is inputted abnormal alarm device on the one hand, and abnormal satellite TV signal is carried out to monitoring, alarming, the opposing partyFace shows through interface input upper strata main frame;
Described digital detector has been used for the function of traditional frequency sweep spectrum analyzer circuit envelope detector, in envelope detection,Amplitude spectrum or the phase information of selecting display in FPGA by the MUX designing, wherein amplitude spectrum passes throughComputing is tried to achieve, and phase information is passed throughComputing is tried to achieve; Envelope signal is the FIR in video filter group againAfter low pass filter smoothing effect, input video wave filter; Final video wave filter is in sampling detection, peak detection, normal state inspectionIn ripple, select the selection rule that in each frequency sweep process, demonstration is counted;
Abnormal alarm device is carrying out frequency spectrum while showing to all band satellite TV signal, what every screen display was shown count is decided to be 800 points,Each point represents the bandwidth of fixed size in all band;
At (N (the 1)～N that counts0) and (N7～N (800)) in frequency range, whether the monitoring of abnormal alarm device there is new carryingRipple, there is the point that is greater than fixed amplitude value, criterion in the range value of rectified signal at this moment in the frequency range of above-mentioned two pointsThat this continued presence of counting is more than 5; The scope of counting of four bandwidth chahnels is respectively (N0～N1）、（N2～N3）、（N4～N5) and (N6～N7), carrier wave disappearance is that the range value of rectified signal is less than standard signal range value in four channel ranges,Criterion is that this continued presence of counting is more than 5; It is that the range value of rectified signal has exceeded in channel range that power exceeds standardAt this moment the range value of bound signal, wants each signaling point in sense channel; Video stretching is that rectified signal is exceeding fixed amplitudeCounting more than counting within the scope of respective channel of value.
Fixed amplitude value is provided according to standard signal range value by user, and standard signal range value is by continuous acquisition 20 frame inspectionsRipple calculated signals mean value obtains.
Abnormal alarm module is by FSM(finite state machine) obtain rectified signal point in each frame and input with standard form signaling pointComparator comparison, judges that whether signaling point is abnormal, by FSM control counter, abnormity point is counted simultaneously, above-mentioned different when meetingNormal counting of reporting to the police reported to the police while requirement. Satellite TV signal monitoring system adopts in software radio basic structure and receives linkThe principle of part, the satellite television radiofrequency signal of reception is first through analog down, then is converted to number through broadband A/D converterWord signal finally carries out the processing of numeric field by loading software mode on general hardware platform, realizes monitoring system to differentThe demand of regular signal monitoring.
Concrete signal processing procedure can be described as, and analog down module is made up of frequency synthesizer and receiver circuit, all-waveSection satellite television radiofrequency signal produces final stage intermediate frequency (IF) signal through the multistage mixing of receiver. In analog down process, frequentlyRate synthesizer part provides the required local oscillation signal of multistage mixing (LO); Final IF signal input mould/number conversion module, through heightSpeed mould/number conversion circuit conversion becomes data signal, finally in digital intermediate frequency module, completes the monitoring function to signal, after processingDigital medium-frequency signal be sent to upper strata main frame through PXI bus again and show.
In each several part signal processing module, the digital intermediate frequency modular design of the application's expound, can be by loading different softwareRealize the demand of different clients to abnormal signal monitoring to the mode of this module, and without changing hardware structure; Simultaneously can be according to needAsk, amplitude spectrum and the phase information of measured signal is provided.
The hardware development platform that digital intermediate frequency module adopts is field programmable logic chip (FPGA). First will adopt based on numberThe frequency sweep spectrum analysis technique of word detection technology is realized the spectrum analysis to all band satellite television radiofrequency signal, then divides according to frequency spectrumThe result of analysing is carried out channel carrier monitoring and signal monitoring, and signal warning note abnormalities. This part function is all at FPGAMiddle realization, last, signal after treatment is sent to upper strata main frame by interface through PXI bus and shows.
Beneficial effect: the digital intermediate frequency module for satellite TV signal monitoring system of the present invention, can meet different clients to notThe demand of monitoring with abnormal signal; On the other hand, when monitoring system is carried out all band spectrum analysis to signal, not only canThe amplitude spectrum of broadband signal is provided, and can makes measurement to the phase information of measured signal.
Brief description of the drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is satellite TV signal monitoring system general structure block diagram;
Fig. 2 is digital intermediate frequency modular circuit structured flowchart;
Fig. 3 is digital detector circuit structure block diagram;
Fig. 4 is abnormal alarm device circuit structure block diagram;
Fig. 5 is the spectrum diagram of satellite television radiofrequency signal ideally.
Detailed description of the invention
Fig. 1 is satellite TV signal monitoring system general structure block diagram, comprise successively the analog down module (receiver) that connects,Mould/number conversion module, digital intermediate frequency module and main frame, analog down module is also circumscribed with frequency synthesizer, analog downModule produces final stage intermediate frequency (IF) signal, wherein frequency synthesis the satellite television radiofrequency signal receiving through the multistage mixing of receiverDevice provides the required local oscillation signal of multistage mixing (LO), and it is data signal that IF signal inputs to mould/number conversion module samples, thisIn mould/number conversion module be by analog-digital converter (ADC) chip AD9642BCPZ-250 form sample circuit; After samplingData signal inputs to digital intermediate frequency module, completes spectrum analysis to all band satellite television radiofrequency signal and to abnormal signalMonitoring, signal after treatment is sent to upper strata main frame through PXI bus and shows.
Fig. 2 is digital intermediate frequency modular circuit structured flowchart, by digital down converter, digital detector, and abnormal alarm device composition,Design all completes in the XC5VSX95T-1FF1136 of Xilinx company model FPGA, the center of data signal after samplingFrequency, at intermediate-frequency band, is first moved base band through digital local oscillator (NCO) signal spectrum after input digital down converter, then warpDesampling fir filter reduces the data transfer rate of data signal;
The two-way baseband signal I (n), the Q (n) that obtain through digital down converter processing, input digital detector. Digital detectorBe made up of envelope detection, video filter group and video detection, digital intermediate frequency module realizes all band satellite television radiofrequency signalSpectrum analysis be adopt this frequency sweep spectrum analysis technique based on digital detection technology;
The rectified signal that digital detector obtains after processing is inputted abnormal alarm device on the one hand, and abnormal satellite TV signal is carried outMonitoring, alarming, shows through interface input upper strata main frame on the other hand.
Fig. 3 is digital detector circuit structure block diagram, for completing the function of traditional frequency sweep spectrum analyzer circuit envelope detector;In envelope detection, select amplitude spectrum or the phase information of display by the MUX designing in FPGA, itsMiddle amplitude spectrum passes throughComputing is tried to achieve, and phase information is passed throughComputing is tried to achieve; Envelope signal is filtered through video againIn ripple device group after the smoothing effect of FIR low pass filter, input video wave filter; Final video wave filter is at sampling detection, peakIn value detection, normal state detection, select the selection rule that in each frequency sweep process, demonstration is counted;
Fig. 4 is abnormal alarm device circuit structure block diagram, and in the time all band satellite TV signal being carried out to frequency spectrum demonstration, every screen display is shownCounting of (frame data) is limited (being decided to be 800 points in design), and each point has just represented in all band fixing largeLittle bandwidth. In ideal conditions, the spectrum distribution of satellite television radiofrequency signal should be as shown in Figure 5.
Occur that new carrier wave, carrier wave disappear, power bound exceeds standard and video stretching is more typical abnormal signal form, differenceClient can select abnormal signal to report to the police according to self-demand. In the time having more monitoring requirements, can be by amendment abnormal alarmThe design code of device in FPGA realizes, and realized monitoring system and met different clients to extremely with general hardware structureThe demand that signal is monitored.
At (N (the 1)～N that counts0) and (N7～N (800)) in frequency range, whether the monitoring of abnormal alarm device there is new carryingRipple, there is the point that is greater than fixed amplitude value, criterion in the range value of rectified signal at this moment in the frequency range of above-mentioned two pointsThat this continued presence of counting is more than 5. The scope of counting of four bandwidth chahnels is respectively (N0～N1）、（N2～N3）、（N4～N5) and (N6～N7), carrier wave disappearance is that the range value of rectified signal is less than standard signal range value in four channel ranges,Criterion is that this continued presence of counting is more than 5; It is that the range value of rectified signal has exceeded in channel range that power exceeds standardAt this moment the range value of bound signal, wants each signaling point in sense channel; Video stretching is that rectified signal is exceeding fixed amplitudeCounting more than counting within the scope of respective channel of value. Above fixed amplitude value is provided according to standard signal range value by user,Standard signal range value is to obtain by continuous acquisition 20 frame rectified signal calculating mean values. In Fig. 4, abnormal alarm device passes throughFSM(finite state machine) obtain rectified signal point and the comparison of standard form signaling point input comparator in each frame, judge signalWhether point is abnormal, by FSM control counter, abnormity point counted, when meeting when counting of above-mentioned abnormal alarm requires simultaneouslyRow is reported to the police.
Claims (2)
1. for a digital intermediate frequency device for satellite TV signal monitoring system, it is characterized in that: by becoming under the numeral connecting successivelyFrequently device, digital detector and abnormal alarm device composition, each several part is at the XC5VSX95T-1FF1136 of Xilinx company model FPGAIn complete, digital down converter input ADC sampled data, after sampling, the centre frequency of data signal is at intermediate-frequency band, defeatedAfter entering digital down converter, first through digital local oscillator, signal spectrum is moved to base band, then reduce numeral letter through down-sampled filter circuitNumber data transfer rate; The two-way baseband signal I (n), the Q (n) that obtain through digital down converter processing input digital detector; NumberWord wave detector is made up of the envelope detection circuit connecting successively, video filtering circuit and video detecting circuit, digital detector placeThe rectified signal obtaining after reason is inputted abnormal alarm device on the one hand, and abnormal satellite TV signal is carried out to monitoring, alarming, anotherAspect shows through interface input upper strata main frame;
Described digital detector has been used for the function of traditional frequency sweep spectrum analyzer circuit envelope detection circuit, in envelope detectionIn, select amplitude spectrum or the phase information of display by the MUX that designs in FPGA, wherein amplitude spectrum is logicalCrossComputing is tried to achieve, and phase information is passed throughComputing is tried to achieve; Envelope signal is again in the video filtering circuitAfter the smoothing effect of FIR low pass filter, input video detecting circuit; Final video detecting circuit sampling detection, peak detection,In normal state detection, select the selection rule that in each frequency sweep process, demonstration is counted;
Described abnormal alarm device is in the time carrying out frequency spectrum demonstration to all band satellite TV signal, counting that every screen display is shown is decided to be 800Individual point; At (N (the 1)～N that counts0) and (N7～N (800)) in frequency range, whether the monitoring of abnormal alarm device occurs newCarrier wave, there is the point that is greater than fixed amplitude value in the range value of rectified signal at this moment in the frequency range of above-mentioned two points, judgement markStandard is that this continued presence of counting is more than 5; The scope of counting of four bandwidth chahnels is respectively (N0～N1)、(N2～N3)、(N4～N5) and (N6～N7), carrier wave disappearance is that the range value of rectified signal is less than standard signal width in four channel rangesDegree value, criterion is that this continued presence of counting is more than 5; It is that the range value of rectified signal is in channel range that power exceeds standardExceed the range value of bound signal, at this moment wanted each signaling point in sense channel; Video stretching is that rectified signal is exceeding admittedlyDetermine counting more than counting within the scope of respective channel of range value;
Abnormal alarm module obtains rectified signal point and the comparison of standard form signaling point input comparator in each frame by FSM, sentencesWhether break signal point is abnormal, by FSM control counter, abnormity point counted simultaneously, wants when meeting counting of above-mentioned abnormal alarmWhile asking, report to the police.
2. the digital intermediate frequency device for satellite TV signal monitoring system according to claim 1, is characterized in that: fixing widthDegree value is provided according to standard signal range value by user, and standard signal range value is to calculate by continuous acquisition 20 frame rectified signalsMean value obtains.
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |