CN2802875Y - Anti-interference power control device of satellite digital broadcast TV. earth station - Google Patents
Anti-interference power control device of satellite digital broadcast TV. earth station Download PDFInfo
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- CN2802875Y CN2802875Y CN 200520072082 CN200520072082U CN2802875Y CN 2802875 Y CN2802875 Y CN 2802875Y CN 200520072082 CN200520072082 CN 200520072082 CN 200520072082 U CN200520072082 U CN 200520072082U CN 2802875 Y CN2802875 Y CN 2802875Y
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Abstract
The utility model relates to an antijamming power control device for a satellite digital broadcasting television, which comprises a transmitting antenna, wherein two groups of frequency converters, A/D transducers, interface circuits, shift registers and data latches are respectively connected with the output end of the downlink carrier signal of the transmitting antenna through both signal input ends of a branch, and then the output end of the downlink carrier signal of the transmitting antenna is connected with the signal input end of a CPU; the communication end of the CPU is connected with the interface of the output power value of transmission. When the device works, the downlink carrier signal of the transmitting antenna is treated by attenuation and branch, and then treated by frequency conversion, filtration and phase lock, and A/D conversion is carried out on the received carrier signal; after passing through the interface circuit, the carrier signal is sent into the shift register and a buffer. Finally, under the control of the CPU, the gain of a high power amplifier and an up-converter is adjusted by adjusting instructions or by the monitoring system of an earth station, thereby, the level of a received signal reaches a normal state so as to resist various interference.
Description
Technical field
The utility model relates to a kind of anti-interference output control device that is applied to satellite communication, and the anti-interference output control device of especially a kind of satellite digital broadcast television belongs to technical field of satellite communication.
Background technology
At present, the means of utilizing satellite communication generally to cover at home as broadcast television transmissions, its advantage is obvious to all.But wireless and transmission characteristic high frequency also causes it very easily to be subjected to the interference of following factor:
(1), climate change makes the transmission signals level produce fluctuation (for example rain declines, avenges and decline etc.);
(2), after the connecting station emitter disturbs by extraneous factor (as temperature), power output be very easy to change (it is outstanding that solid state power amplifier shows especially);
(3), the interference of illegal signals (malice as Falun Gong is invaded and harassed).
These interference not only can cause the decline of transmission quality, and deal with improperly sometimes and will bring ill effect.For example, deal with even can only rely on manually for the illegal invasion of malice---the supervision that operator on duty's ideological plane is concentrated, from being found to processing, at least also 30 seconds.
Understand according to the applicant, and present widely used uplink power control (hereinafter to be referred as UPC---Uplink Power Control), all based on " beacon method " or " atmospheric noise method ".The essence of these two kinds of methods all is that intermediate frequency decay is embedded in the up link, and the variation according to beacon level or atmospheric noise decays to intermediate frequency, to reach the purpose of regulating power.When decaying naturally, changing all can appear in beacon level, noise temperature coefficient, and this moment, UPC can in time carry out the ascending power adjustment according to these variations.Facts have proved that existing UPC is that the connecting station of Ku frequency range uses very general, respond well in frequency.But this existing UPC technology can't solve the transmitting power fluctuation that causes because of upstream plant (power amplifier) job insecurity, and the transmission quality that causes therefrom descends.Also can't invade and harass and in time react malice.In addition, it is embedded the link that up link has increased up link, have more a potential faults virtually, reduced the reliability of device.
The utility model content
The utility model wants the technical solution problem to be: the shortcoming at above prior art exists proposes the anti-interference output control device of a kind of satellite digital broadcast television earth station, thereby reliably contains the especially invasion of illegal signals of interference signal.
In order to solve above technical problem, the anti-interference output control device of satellite digital broadcast television earth station of the present utility model comprises transmitting antenna, the descending carrier signal output part of described transmitting antenna connects two groups of frequency converters, A/D converter, interface circuit, shift register displacement, data latches respectively through two signal input parts of branch, and then connecing the signal input part of CPU, the communication terminal of described CPU connects high power amplifier by electronic switch and adjusts interface.
This device both can use separately, also can be used as a part of the anti-interference power control system of whole satellite digital broadcast television earth station.During work, return the reception of carrier wave as loop with the transmitting antenna collection of letters, the descending carrier signal is after overdamping, branch, send into two signal input parts, through frequency conversion, filtering and phase-locked after, carry out the A/D conversion with obtaining after the signal level sampling of carrier wave, form data flow, behind interface circuit, send into shift register displacement, waiting for CPU reads in pointer in buffer.CPU will read the error rate of two signals simultaneously this moment, put into RAM.After the CPU access, CPU compares processing with this data flow.Meanwhile, the emission power output numerical value that reads in interface of data flow.Under the control of CPU, by adjusting instruction the gain of high power amplifier and upconverter is adjusted, or adjusted, thereby make received signal level reach normal condition by the earth station supervisory control system, resist various interference.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the circuit theory diagrams of an embodiment of the utility model.
Fig. 2 is with the device of Fig. 1 embodiment schematic diagram as the anti-interference power control system part of whole satellite digital broadcast television earth station.
Embodiment
Embodiment one
The device of present embodiment as shown in Figure 1, the descending carrier signal output part of transmitting antenna connects two groups of frequency converters (F7HZ0184), A/D converter (HY57V16161), interface circuit, shift register displacement (P9952AY), data latches respectively through two signal input parts of branch, and then connects the signal input part PI mouth of CPU (AT89C52).Communication terminal TXD, the RXT of CPU by electronic switch (74HC245D) and I/O mouth respectively sending and receiving penetrate power output numerical value interface 1 and interface 2 and 3.
For the ease of observing control, the demonstration output P0 mouth of CPU connects LED display module (FM1602C).
During practical application, this device both can use separately, also can be as shown in Figure 2, and as a part of the anti-interference power control system of whole satellite digital broadcast television earth station.
When using separately, collect mail with transmitting antenna and to return the reception of carrier wave as loop, the descending carrier signal is after overdamping, branch, send into two signal input parts, through frequency conversion, filtering and phase-locked after, obtain wanted carrier A, B (A is given capable carrier wave by our station, and B is given capable carrier wave by adjacent station).To carry out the A/D conversion after the sampling of the signal level of A, B carrier wave, form eight bit data stream, after interface circuit is handled, itself and cpu clock are kept synchronously, send into shift register then and be shifted, waiting for CPU reads in pointer in buffer.This moment, CPU read A simultaneously, and the error rate of two signals of B is put into RAM.After the CPU access, CPU compares processing with this data flow, meanwhile, the emission power output numerical value that data flow is read in interface 1, the LCD display module by CPU sends into 16 is presented on the cabinet panel.When the result of calculation of CPU is thought, when power output need adjust, the I/O mouth that the adjustment instruction is chosen by electronic switch is adjusted the gain of high power amplifier and upconverter, or adjust by the earth station supervisory control system that (position of electronic switch is by program control, when the high power amplifier gain of adjustment can not reach demand, switch is connected interface 2 automatically, and gain is adjusted to upconverter; When switch connection interface 3, UPC adjusts power output by the our station supervisory control system), make received signal level reach normal condition.
When being the transmitting-receiving closed-loop regulating system of center pie graph 2, can carry out discriminatory analysis to four kinds of accepting states (coupling, near-end, far-end, adjacent carrier) and beacon level with this device.When needs carry out power adjustments, send and adjust instruction to control computer (also can directly regulate) to power, by the control computer power amplifier or upconverter are regulated.Whole system its working principles very simple----is judged corresponding increase and decrease power to decline and interference.Owing to be not only an equipment, but a system, so the accuracy of its judgement, reliability further increase.
Conclusion is got up, and present embodiment has following characteristics:
1, program controlled software is the core of this anti-interference output control device, and program has the multiple error-correcting function;
2, beacon level sampling, the level (normal condition is a constant) that beacon receiver receives is for judging reference point;
3, the sampling of making an uproar is carried in reception, the received power level sampling is judged interference;
4, image comparison is compared from the image of articulating receipts and the image of standard receiving antenna; SI information comparison in comparison of image code stream packet and the code stream;
5, adopt big earlier ring back to judge, make it to have got rid of the caused erroneous judgement of upstream plant fault from the pattern of ring;
6, in video, (do not influence normal reception) with a random code is multiplexing.Be used for judgement to interference signal;
7, can be automatic to the gain of high power amplifier, also can manually adjust;
8, program controlled software can write down the adjustment time, and adjustment process and adjustment result be connected when using with monitoring, but tracer signal are interrupted situation;
9, the judging point data are undesired, will send alarm signal.
According to the data that judging point is got,, when power output need adjust,, the gain of high power amplifier is adjusted adjusting the interface of instruction by high power amplifier when the result of calculation of CPU is thought.Finish less than 4 seconds from determining whole work, make received signal level reach normal condition, facts have proved its adjustment rate of accuracy reached to 100%.
In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (3)
1. anti-interference output control device of satellite digital broadcast television earth station, comprise transmitting antenna, it is characterized in that: the descending carrier signal output part of described transmitting antenna connects two groups of frequency converters, A/D converter, interface circuit, shift register displacement, data latches respectively through two signal input parts of branch, and then connecing the signal input part of CPU, the communication terminal of described CPU connects high power amplifier by electronic switch and adjusts interface.
2. according to the anti-interference output control device of the described satellite digital broadcast television earth station of claim 1, it is characterized in that: the demonstration output port of described CPU connects the LED display module.
3. according to the anti-interference output control device of the described satellite digital broadcast television earth station of claim 2, it is characterized in that: the communication terminal of described CPU connects high power amplifier respectively by electronic switch and I/O mouth and adjusts interface and upconverter gain adjustment interface and power output adjustment interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520072082 CN2802875Y (en) | 2005-05-26 | 2005-05-26 | Anti-interference power control device of satellite digital broadcast TV. earth station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520072082 CN2802875Y (en) | 2005-05-26 | 2005-05-26 | Anti-interference power control device of satellite digital broadcast TV. earth station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2802875Y true CN2802875Y (en) | 2006-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520072082 Expired - Fee Related CN2802875Y (en) | 2005-05-26 | 2005-05-26 | Anti-interference power control device of satellite digital broadcast TV. earth station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2802875Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763292A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-interference mobile digital broadcasting signal transmission method |
| CN106452553A (en) * | 2016-10-31 | 2017-02-22 | 航天恒星科技有限公司 | Power control method and system for radio and television uplink station satellite signal |
-
2005
- 2005-05-26 CN CN 200520072082 patent/CN2802875Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763292A (en) * | 2014-01-13 | 2014-04-30 | 宁波大学 | Anti-interference mobile digital broadcasting signal transmission method |
| CN106452553A (en) * | 2016-10-31 | 2017-02-22 | 航天恒星科技有限公司 | Power control method and system for radio and television uplink station satellite signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |