CN201146579Y - Device for monitoring working state of broadcasting television satellite transmission system equipment - Google Patents
Device for monitoring working state of broadcasting television satellite transmission system equipment Download PDFInfo
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- CN201146579Y CN201146579Y CNU2007200073313U CN200720007331U CN201146579Y CN 201146579 Y CN201146579 Y CN 201146579Y CN U2007200073313 U CNU2007200073313 U CN U2007200073313U CN 200720007331 U CN200720007331 U CN 200720007331U CN 201146579 Y CN201146579 Y CN 201146579Y
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Abstract
The utility model provides a monitoring device for monitoring the work state of broadcasting TV satellite transmission system equipment, which comprises a coupling receiver, a downlink receiver, a channel monitoring instrument, a spectrum analyzer, a transmission flow comparison instrument, a transmission flow grapher recording meter, a gateway, a network exchanger, a monitoring server and a monitoring terminal; the computer technology is used for collecting the uplink and downlink program spectrum signals and the channel bit error rate of the broadcasting TV satellite in real time; the malicious interference can be judged by analyzing the bit stream comparison, the spectrum and the channel bit error rate; the uplink power can be increased automatically; the aim of resisting illegal interferences can be quickly and correctly achieved; the monitoring device for monitoring the work state of broadcasting TV satellite transmission system equipment has the functions of detection, monitoring, automatic diagnose of equipment errors, intelligent management, data real-time record, journal searching and error short message sending etc.
Description
Technical field:
The utility model relates to a kind of monitoring terminal, particularly about operation status of broadcast television satellite transmission system.
Background technology:
Broadcast TV program signal earth station is via satellite delivered to satellite repeater, and emission via satellite covers service area.Because the simple beam excipient dual-mode antenna that existing radio and television communication satellite adopts the payload system mostly to be Transparent Transponder and to cover service area is not considered artificial malicious interference during design; Therefore, existing radio and television communication satellite coverage can receive the radiofrequency signal of any modulation system in the corresponding frequencies and transmit, and causes the normal program signal to be interfered.In addition, the angle of slave unit input and economic benefit considers that the broadcast satellite station is to make it have higher sensitivity, adopts less ascending power.So just make that the up attack of malice is easy.2005 so far, and the radio and television of the existing Chinese Central Television (CCTV) and a plurality of states introspection platform program of broadcasting TV programs by satellite has been subjected to illegal interference.
Summary of the invention:
The purpose of this utility model is that a kind of operation status of broadcast television satellite transmission system monitoring device will be provided, and it can realize resisting quickly and accurately the purpose of illegal interference.
The utility model comprises coupled receiver, downlink receiver, channel monitoring instrument, frequency spectrograph, transport stream comparison instrument, transport stream recorder, gateway, the network switch and monitor server and monitoring terminal, it is characterized in that: the radiofrequency signal that coupling receives is through power splitter input coupled receiver, and the ASI signal of the output of coupled receiver inserts transport stream comparison instrument, transport stream recorder respectively; Descending radiofrequency signal is imported downlink receiver, channel monitoring instrument, frequency spectrograph respectively through behind the power splitter; The ASI signal of downlink receiver output is imported transport stream comparison instrument, transport stream record again respectively; The communication interface of channel monitoring instrument is connected in gateway, and the communication interface of frequency spectrograph is connected with the communication interface of monitor server; The network switch is connected with transport stream comparison instrument, transport stream recorder, gateway, monitor server and monitoring terminal.
System of the present utility model utilizes computer technology to gather broadcast satellite uplink and downlink program spectrum signal and channel bit error rate in real time, analysis by code stream comparison, frequency spectrum and channel bit error rate, malicious interference is judged, promoted ascending power automatically, reach and resist the illegal purpose of disturbing quickly and accurately.Possess monitoring, monitoring, equipment fault automatic diagnosis, intelligent management etc.; Possess functions such as data in real time record, log searching, the transmission of fault short message.
Description of drawings:
Fig. 1 is a theory diagram of the present utility model; (annotate: solid line is represented radio frequency line, and dotted line is represented the ASI holding wire, and pecked line is represented the Communication Control line.)
Fig. 2 among Fig. 2 (a) is the analog signal spectrogram, Fig. 2 (b) digital signal spectrogram.
Embodiment:
As shown in Figure 1, the operation principle of this device:
During operate as normal, ascending power and descending power and carrier-to-noise ratio guarantee the error rate in normal range (NR), normally program receiving all in normal range (NR).
Natural disturbance (like rain declining etc.) or equipment fault only can cause the error rate to rise to complete error code, and the channel available power should obviously diminish as a rule in this case.
Artificial disturbance is under the situation of single carrier and narrow band interference, and is similar from observed phenomenon of receiver end and natural disturbance.Can see single carrier (or arrowband) spike on the downstream signal frequency spectrum.Under same parameter signal (bandwidth, symbol rate, modulation system are all identical) disturbed condition, for signal is that the satellite repeater of MF Multi-Channel Per Carrier has been operated under the state of saturated or automatic gain control, the power of downstream signal is constant substantially, and the frequency spectrum of downstream signal does not have significant change; And be that the satellite repeater channel power of single channel per carrier should have obvious rising for signal.In the process that interference signal grows from weak to strong, following situation may be arranged:
1, interference (channel bit error rate rises, but corrects fully by error correction, and code stream is normal, and image is normal) is arranged.
2, disturb serious (mosaic, quiet frame, black field etc. appear in image for error correction fully, code stream generation mistake).
3, disturb more serious (disturb and the basic same magnitude of signal strength signal intensity, cause the QPSK fully can not demodulation, do not have code stream output, also do not have image).
4, interference power continues to strengthen, merely from signal strength signal intensity, normal signal has become interference source, (QPSK can demodulation, and code stream output is arranged, and image output is arranged, but the code stream of this moment is the code stream of interference source, it is the image of interference source that image shows, code stream has error code, and image has mosaic etc.).
5, interference power is powerful, and the image demonstration is that the image and the picture quality of interference source is normal.(the previous relatively stage of the error rate descends, code stream output inerrancy).
Character according to interference signal (is natural phenomena interference, still artificial rogue attacks; Whether broadband or arrowband are single carriers), significantly unusual from can observing of having of receiving terminal satellite intermediate-freuqncy signal frequency spectrum, what have does not observe obvious variation, and the Channel Transmission error rate is all very responsive to the minor variations of signal.Therefore in safety broadcasting signal monitoring system, we adopt the Channel Transmission error rate and channel power as main interference monitoring parameter and basis for estimation.According to the situation of actual reception system, set rational thresholding and can quite accurately judge situation about being interfered, early warning and preliminary judgement are provided.The observation process of system and operation are full automatic, when monitoring parameter surpasses predetermined threshold, trigger alarm signal output automatically.
Interference type must accurately be determined after finding to disturb, so that take counter-measure immediately.Be the rogue attacks signal if disturb, its final purpose is to wish that illegal picture can broadcast, and therefore the data code flow of transmission finally corresponding variation can take place.Can the very first time confirm rogue attacks by the byte-by-byte comparison of up-downgoing transport stream.Confirm to disturb for after the rogue attacks, the trigger equipment linked system is finished functions such as automatic increase up-link carrier power according to default scheme, the shielding signal to attack.
Spectrogram when using frequency spectrograph to measure, should be that the signal power in the signal bandwidth is carried out integration, and signal bandwidth is: symbol rate x (1+a), wherein a is the rolloff-factor of raised cosine band pass filter, to DVB-S a=0.35, to DVB-Ca=0.15
Figure shape mode shows the channel status that can intuitively reflect current demand signal among Fig. 2.
To the analysis of transport stream, comprise the monitoring of three staging errors, mainly contain synchronization loss, continuous counter mistake, PCR precision mistake, PCR interval mistake etc.In order to ensure mutual interoperability, wherein Ce Shi the part that comprises compressibility distributes and presents and broadcast compressibility, broadcast transmission stream and receiver.
290 monitoring mistake priority classifications; Prevention decodability mistake, damage decodability mistake (people in the decoded picture be distortion, interrupted decoding) is indicated the problem of encoder or multiplexer but is not influenced decodability.
Type of error-by the details classification; Certain fault (the sync byte of packet, the continuity counting, CRC mistake, bandwidth mistake (bit rate is too high or too low)), information on services mistake (PAT mistake, the PMT mistake, other form mistake, unreferenced PID), the PID mistake--PID loses, timing error one PCRs, decoder error-buffer underflow/excessive excessively, damaged condition.
The data that system reaches record in real time comprise the error rate, frequency spectrum data, code stream analysis warning message, downlink transfer bit stream data.
System is divided into manual and automatic two states to the control of power, and under the manual case, high power amplifier power output is controlled by monitoring system automatically.Automatically during control, system is to monitoring the current frequency spectrum data, error rate data, and the comparison state is made analysis-by-synthesis, and makes the control of lifting power.When being in manual state, the power amplifier power output is not controlled by monitoring system, by Artificial Control.
When monitoring system is judged up-downgoing code stream comparison mistake, and meet when pushing away power condition automatically, system is according to default step pitch, automatically bring to power.For preventing that power from being got off from motion tracking, the power control mode of system is accepted manually control from transferring manual control mode automatically to.
System judges with each frequency level situation of transponder by to the analysis of frequency spectrum data, is being subjected to that single carrier disturbs, rain declines and can adjusting this frequency power output automatically during with transponder frequency liter (falling) power, accomplish power from motion tracking and adjustment.When system's judgement was subjected to artificial disturbance, the automatic regulatory function of spectrum power stopped.
Claims (1)
1, a kind of operation status of broadcast television satellite transmission system monitoring device, comprise coupled receiver, downlink receiver, channel monitoring instrument, frequency spectrograph, transport stream comparison instrument, transport stream recorder, gateway, the network switch and monitor server and monitoring terminal, it is characterized in that: the radiofrequency signal that coupling receives is through power splitter input coupled receiver, and the ASI signal of the output of coupled receiver inserts transport stream comparison instrument, transport stream recorder respectively; Descending radiofrequency signal is imported downlink receiver, channel monitoring instrument, frequency spectrograph respectively through behind the power splitter; The ASI signal of downlink receiver output is imported transport stream comparison instrument, transport stream record again respectively; The communication interface of channel monitoring instrument is connected in gateway, and the communication interface of frequency spectrograph is connected with the communication interface of monitor server; The network switch is connected with transport stream comparison instrument, transport stream recorder, gateway, monitor server and monitoring terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200073313U CN201146579Y (en) | 2007-06-12 | 2007-06-12 | Device for monitoring working state of broadcasting television satellite transmission system equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200073313U CN201146579Y (en) | 2007-06-12 | 2007-06-12 | Device for monitoring working state of broadcasting television satellite transmission system equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201146579Y true CN201146579Y (en) | 2008-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200073313U Expired - Fee Related CN201146579Y (en) | 2007-06-12 | 2007-06-12 | Device for monitoring working state of broadcasting television satellite transmission system equipment |
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| CN (1) | CN201146579Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112399450A (en) * | 2020-12-11 | 2021-02-23 | 中国联合网络通信集团有限公司 | Interference evaluation method and device |
-
2007
- 2007-06-12 CN CNU2007200073313U patent/CN201146579Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112399450A (en) * | 2020-12-11 | 2021-02-23 | 中国联合网络通信集团有限公司 | Interference evaluation method and device |
| CN112399450B (en) * | 2020-12-11 | 2023-06-16 | 中国联合网络通信集团有限公司 | Interference assessment method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081105 Termination date: 20110612 |