CN103762995A - Signal receiving unit and implementing method thereof - Google Patents
Signal receiving unit and implementing method thereof Download PDFInfo
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- CN103762995A CN103762995A CN201410041457.7A CN201410041457A CN103762995A CN 103762995 A CN103762995 A CN 103762995A CN 201410041457 A CN201410041457 A CN 201410041457A CN 103762995 A CN103762995 A CN 103762995A
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Abstract
The invention discloses a signal receiving unit and an implementing method thereof. The signal receiving unit comprises a first signal channel and a second signal channel, first polar signals are processed through a ceramic low pass filter in the first signal channel, second polar signals are processed through a ceramic high pass filter in the second signal channel, and then the processed first polar signals and the processed second polar signals are integrated. The ceramic high pass filter and the ceramic low pass filter can reduce interference between every two channels, can effectively remove unnecessary frequency bands, and therefore reduce interference among the frequency bands, the signal to noise ratio is increased, and a signal picture is clearer.
Description
Technical field
The invention belongs to signal process field, more precisely, relate to the processing of satellite-signal.
Background technology
Present satellite-based system is by more and more for TV transmission program.Conventionally, One Earth One Family synchronous satellite receives ground signal, and down link signal is to the ground-plane antenna that is positioned at satellite coverage.Ground-plane antenna generally includes a parabolic antenna and for amplification, filtering, is the intermediate frequency low noise module that can be coupled with receiver by the frequency inverted that receives signal.
In order to increase the bandwidth from satellite-signal, signal sends at the two poles of the earth.For example, when, the two poles of the earth are 90 ° of out-phase, can make the bandwidth of satellite-signal double.The low noise module of ground-plane antenna must be separated single polarized signal, and they are sent to reception receiving unit.
Sometimes, be difficult to receive best satellite-signal.For example, from a broadcasting channel, may disturb the reception that can reduce other channel.Concerning user, this can cause definition step-down, the signal to noise ratio of image higher.
Summary of the invention
The present invention, in order to solve problems of the prior art, provides a kind of signal processing unit.
In order to realize above-mentioned object, technical scheme of the present invention is: a kind of signal receiving unit, comprising:
First signal path, comprising:
The first polar signal input of low noise module loop, for receiving the input of the first polar signal, the frequency range of described the first polar signal is between 11.7GHZ to 12.2GHZ;
Be configured for the first amplifying stage of pre-amplification, for amplifying the first polar signal;
10.75GHZ local oscillator with the first amplifying stage coupling, for receiving the first polar signal after amplification, and converts thereof into 950 to 1450MHz secondary signal;
With the first intermediate frequency amplifier of 10.75GHZ local oscillator coupling, for receiving secondary signal, and with the ceramic low pass filter of the first intermediate frequency amplifier coupling;
Secondary signal path, comprising:
The first polar signal input of low noise module loop, for receiving the input of the second polar signal, the frequency range of described the second polar signal is between 11.7GHZ to 12.2GHZ;
Be configured for the second amplifying stage of pre-amplification, for amplifying the second polar signal;
10.10GHZ local oscillator with the second amplifying stage coupling, for receiving the second polar signal after amplification, and converts thereof into 1600 to 2100MHz the 3rd signal;
With the second intermediate frequency amplifier of 10.10GHZ local oscillator coupling, for receiving the 3rd signal, and with the ceramic high pass filter of the second intermediate frequency amplifier coupling.
Preferably, also comprise:
Signal synthetic apparatus, is communicated with the secondary signal through ceramic low pass filter, and the 3rd signal of the ceramic high pass filter of process.
Preferably, described the first amplifying stage is casacade multi-amplifier.
Preferably, described the second amplifying stage is casacade multi-amplifier.
The present invention also provides a kind of method that realizes above-mentioned signal receiving unit, comprises the steps:
In the first path, the first polar signal is coupled with 10.75GHZ local oscillator after amplifying, and changes into 950 to 1450MHz secondary signal; Secondary signal, after the first intermediate frequency amplifier amplifies, is carried out filtering through ceramic low pass filter;
In alternate path, the second polar signal is coupled with 10.10GHZ local oscillator after amplifying, and changes into 1600 to 2100MHz the 3rd signal, and the 3rd signal is after the second intermediate frequency amplifier amplifies, through ceramic high pass filter filters.
Preferably, by filtered secondary signal, the 3rd signal integration.
Signal receiving unit provided by the invention, ceramic high pass filter and ceramic low pass filter can reduce the interference of adjacent channel, can effectively remove unwanted frequency band, thereby reduce the interference between frequency band, have improved signal to noise ratio, make signal picture more clear.
Accompanying drawing explanation
Fig. 1 illustrates the composition structure of Satellite signal distribution system of the present invention.
Fig. 2 is the structural representation of signal receiving unit in one embodiment of the present invention.
Fig. 3 is the flow chart of realizing signal receiving unit of the present invention.
Embodiment
For the technical problem that the present invention is solved, the technical scheme of employing, the technique effect easy to understand of obtaining, below in conjunction with concrete accompanying drawing, the specific embodiment of the present invention is described further.
Fig. 1 shows the parts of the satellite-signal distribution system in the embodiment of the present invention.In Fig. 1, earth-orbiting satellite 1 sends down link signal 2, and is received by the antenna system being comprised of antenna bay 3 and loop assembly 4.
In an embodiment of the present invention, loop assembly 4 comprises a lnb feed horn (tuner), and this belongs to the common practise of this area.Conventionally, tuner comprises a circuit, be used for amplifying, and frequency down-converts down link signal 2 is intermediate frequency, its together with feed horn from antenna bay 3 receiving downlink signals.In an embodiment of the present invention, the Ku band signal that down link signal 2 is 11.7GHz to 12.7GHz.
In an embodiment of the present invention, system further comprises a receiver 6, and it is normally coupled and communicates with feedback device assembly 4 by coaxial cable.Receiver 6 receives the intermediate-freuqncy signal from loop assembly 4, selects the specific TV channel showing on TV 5 subsequently.
Fig. 2 is according to the schematic diagram of signal receiving circuit in the embodiment of the present invention 15.According to embodiments of the invention, signal receiving circuit 15 is the part in loop assembly 4 shown in Fig. 1.It should be noted that for simplicity, some assemblies that appear in Fig. 2 will be not described in detail.In Fig. 2, signal receiving circuit 15 comprises for the first signal path 14 of receiving downlink signal 2 and secondary signal path 23.In an embodiment of the present invention, first signal path 14 comprises the first polar signal input 7 for receiving the first polar signal.The first polar signal can be the signal of a perpendicular polarization.In one embodiment of this invention, the first polar signal is right-hand polarization signal.In another embodiment, the first polar signal is left-handed polarization signal.
In the present invention, first signal path 14 also comprises amplifying stage 8, before signal is mixed to required frequency, signal is amplified in advance.In one embodiment, amplifying stage 8 comprises a High Electron Mobility Transistor as low noise amplifier (LNA) (HEMT).In one embodiment, amplifying stage 8 is made by GaAs technology.In one embodiment, amplifying stage 8 is 3 grades of amplifiers.In another embodiment of the present invention, amplifying stage 8 is two-stage or one-stage amplifier.In one embodiment, first signal path 14 also comprises that a band pass filter 9 is to remove unwanted frequency component.In one embodiment, band pass filter 9 is a microstrip bandpass filter.
In one embodiment, first signal path 14 also comprises a frequency mixer 11 that is coupled with 10.75GHZ local oscillator 10.In one embodiment, frequency mixer 11 comprises a diode, as Schottky diode.In another embodiment, frequency mixer 11 comprises a field-effect transistor (FET).In another embodiment, frequency mixer 11 comprises monolithic integrated microwave circuit (MMIC).It should be noted that at embodiments of the invention and be not limited to above-mentioned specifically described mixer.
In one embodiment, first signal path 14 further comprises intermediate frequency amplifier 12.In one embodiment, intermediate frequency amplifier 12 is a dual-stage amplifier.In one embodiment, every grade of amplifier is distinguished by saturated bearing power separately.
In one embodiment, first signal path 14 also comprises the ceramic low pass filter 13 being coupled with intermediate frequency amplifier 12.Pottery low pass filter 13 makes the signal of expecting by removing unwanted frequency signal.
In one embodiment, ceramic low pass filter 13 has the band resistance of at least 30 decibels.In embodiments of the present invention, ceramic low pass filter 13 is coupled with signal synthetic apparatus 24.
In the present invention, secondary signal path 23 comprises amplifying stage 17, before signal is mixed into required frequency, by signal pre-amplification in advance.
In one embodiment, amplifying stage 17 comprises a High Electron Mobility Transistor as low noise amplifier (LNA) (HEMT).
In one embodiment, amplifying stage 17 is made by GaAs technology.Amplifier stage 17 is 3 grades of amplifiers; In other embodiments of the invention, amplifying stage 17 is two-stage or one-stage amplifier.
In operation, downstream signal 2 comprises for example, the first polarity in 10 passages of the first polarity (, vertical polarization) and 10 passages of the second polarity (as horizontal polarization).In another embodiment, described the first polarity is clockwise or counterclockwise polarity, and the second polarity is counterclockwise or clockwise polarity.
Frequency mixer 11 mixes the perpendicular polarization signal in down link signal 2 with the signal of 10.75 gigahertzs from local oscillator 10, to produce one, have the intermediate-freuqncy signal of 950 megahertzes (MHz) to 1450 megahertzes.Identical, frequency mixer 20 mixes the horizontal polarization signal in down link signal 2 with the signal of 10.1 gigahertzs from local oscillator 19, to produce an intermediate-freuqncy signal with 1600 megahertz to 2100 megahertzes.
In an embodiment of the present invention, the intermediate-freuqncy signal of exporting from intermediate frequency amplifier 12 is imported into ceramic low pass filter 13.Equally, the intermediate-freuqncy signal of exporting from intermediate frequency amplifier 21 is imported into ceramic high pass filter 22.Compared with traditional tuner, the ceramic filter (for example, the low pass filter 13 of pottery and ceramic high pass filter 22) using in the present invention has excellent effect.Pottery high pass filter 22 and ceramic low pass filter 13 can reduce the interference of adjacent channel.More specifically, compared with traditional design, embodiments of the invention have at least improved the Out-of-band rejection of 30 decibels.And unwanted frequency band can be effectively removed in design of the present invention.Thereby the interference between reduction frequency band, has improved signal to noise ratio, TV 5 is shown more clear.
In an embodiment of the present invention, apply two different local oscillators (10,19), polar signal is separately converted into the intermediate-freuqncy signal of 950 to 2100 megahertzes.Signal synthetic apparatus 24 receives from the intermediate-freuqncy signal of 950-1450MHz in first signal path 14 and from 1600 to 2100 intermediate-freuqncy signals in secondary signal path 23.
Fig. 3 is the flow process Figure 100 that realizes signal receiving unit of the present invention.In step 101, in first signal path, utilize ceramic low pass filter processing to input to the first polar signal in lnb feed horn.With reference to the description of figure 2, the first polar signal (for example, a vertical polarity, with clockwise polarity, or counterclockwise polarity) by the loop assembly 4 in first signal path 14, processed.In an embodiment of the present invention, first signal path 14 comprises ceramic low pass filter 13.
Step 102: in secondary signal path, utilize ceramic high pass filter, processes to input to the second polar signal in lnb feed horn.With reference to the description of figure 2, the second polar signal (for example, the polarity of a level, clockwise or anticlockwise polarity) is processed by the loop assembly 4 in secondary signal path 23.In an embodiment of the present invention, secondary signal path 23 comprises ceramic high pass filter 22.
As discussed above, embodiments of the invention, with respect to traditional design, have larger Out-of-band rejection and decay, and the interference between frequency band is few, has improved signal to noise ratio, can obtain image more clearly.
The present invention is by preferred embodiment having carried out detailed explanation.But, by studying carefully above, the variation to each execution mode and to increase be also that one of ordinary skill in the art institute is apparent.Being intended that all these variations and increasing of applicant all dropped in the scope that the claims in the present invention protect.
Similar numbering refers to similar element in the whole text.For clarity, may there is in the accompanying drawings the situation that some line, layer, element, parts or feature are amplified.
Term used herein is only for to be illustrated specific embodiment, and it is not intended to limit the invention.Unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) are all identical with one of ordinary skill in the art's of the present invention understanding.
Claims (6)
1. a signal receiving unit, is characterized in that comprising:
First signal path, comprising:
The first polar signal input of low noise module loop, for receiving the input of the first polar signal, the frequency range of described the first polar signal is between 11.7GHZ to 12.2GHZ;
Be configured for the first amplifying stage of pre-amplification, for amplifying the first polar signal;
10.75GHZ local oscillator with the first amplifying stage coupling, for receiving the first polar signal after amplification, and converts thereof into 950 to 1450MHz secondary signal;
With the first intermediate frequency amplifier of 10.75GHZ local oscillator coupling, for receiving secondary signal, and with the ceramic low pass filter of the first intermediate frequency amplifier coupling;
Secondary signal path, comprising:
The first polar signal input of low noise module loop, for receiving the input of the second polar signal, the frequency range of described the second polar signal is between 11.7GHZ to 12.2GHZ;
Be configured for the second amplifying stage of pre-amplification, for amplifying the second polar signal;
10.10GHZ local oscillator with the second amplifying stage coupling, for receiving the second polar signal after amplification, and converts thereof into 1600 to 2100MHz the 3rd signal;
With the second intermediate frequency amplifier of 10.10GHZ local oscillator coupling, for receiving the 3rd signal, and with the ceramic high pass filter of the second intermediate frequency amplifier coupling.
2. signal receiving unit according to claim 1, is characterized in that, also comprises:
Signal synthetic apparatus, is communicated with the secondary signal through ceramic low pass filter, and the 3rd signal of the ceramic high pass filter of process.
3. signal receiving unit according to claim 1, is characterized in that: described the first amplifying stage is casacade multi-amplifier.
4. signal receiving unit according to claim 1, is characterized in that: described the second amplifying stage is casacade multi-amplifier.
5. realize a method for signal receiving unit as claimed in claim 1, it is characterized in that comprising the steps:
In the first path, the first polar signal is coupled with 10.75GHZ local oscillator after amplifying, and changes into 950 to 1450MHz secondary signal; Secondary signal, after the first intermediate frequency amplifier amplifies, is carried out filtering through ceramic low pass filter;
In alternate path, the second polar signal is coupled with 10.10GHZ local oscillator after amplifying, and changes into 1600 to 2100MHz the 3rd signal, and the 3rd signal is after the second intermediate frequency amplifier amplifies, through ceramic high pass filter filters.
6. method according to claim 5, characterized by further comprising: by filtered secondary signal, the 3rd signal integration.
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| CN201410041457.7A CN103762995B (en) | 2014-01-28 | 2014-01-28 | Signal receiving unit and its implementation |
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| CN201410041457.7A CN103762995B (en) | 2014-01-28 | 2014-01-28 | Signal receiving unit and its implementation |
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| CN103762995A true CN103762995A (en) | 2014-04-30 |
| CN103762995B CN103762995B (en) | 2016-03-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294547A (en) * | 2017-08-07 | 2017-10-24 | 华讯方舟科技有限公司 | A kind of microwave frequency changer circuit and microwave converter |
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| CN1918805A (en) * | 2005-01-17 | 2007-02-21 | 松下电器产业株式会社 | Turner, and mobile device using the same |
| CN201075398Y (en) * | 2007-08-29 | 2008-06-18 | 郴州高斯贝尔数码科技有限公司 | Ku frequency band four-local oscillator two-way output low noise frequency demultiplier |
| US20090146764A1 (en) * | 2007-12-10 | 2009-06-11 | Tzong-Jyh Chen | Down-converter Having 90-Degree Hybrid Coupler with Open-circuited Transmission line(s) or Short-circuited Transmission line(s) Included Therein |
| CN201365248Y (en) * | 2009-02-18 | 2009-12-16 | 深圳翔成电子科技有限公司 | Double output circular polarization satellite low noise block |
| CN103259990A (en) * | 2013-03-21 | 2013-08-21 | 宁波森富机电制造有限公司 | Four-local-oscillator and single-output Ku-waveband tuner |
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2014
- 2014-01-28 CN CN201410041457.7A patent/CN103762995B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1918805A (en) * | 2005-01-17 | 2007-02-21 | 松下电器产业株式会社 | Turner, and mobile device using the same |
| CN201075398Y (en) * | 2007-08-29 | 2008-06-18 | 郴州高斯贝尔数码科技有限公司 | Ku frequency band four-local oscillator two-way output low noise frequency demultiplier |
| US20090146764A1 (en) * | 2007-12-10 | 2009-06-11 | Tzong-Jyh Chen | Down-converter Having 90-Degree Hybrid Coupler with Open-circuited Transmission line(s) or Short-circuited Transmission line(s) Included Therein |
| CN201365248Y (en) * | 2009-02-18 | 2009-12-16 | 深圳翔成电子科技有限公司 | Double output circular polarization satellite low noise block |
| CN103259990A (en) * | 2013-03-21 | 2013-08-21 | 宁波森富机电制造有限公司 | Four-local-oscillator and single-output Ku-waveband tuner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294547A (en) * | 2017-08-07 | 2017-10-24 | 华讯方舟科技有限公司 | A kind of microwave frequency changer circuit and microwave converter |
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| CN103762995B (en) | 2016-03-09 |
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Effective date of registration: 20211026 Address after: 518102 Guangdong, Shenzhen, Baoan District Xixiang street, thirty-seventh fields, 4 floor, 418 Patentee after: SHENZHEN HUAXUN FANGZHOU SATELLITE INDUSTRIAL TECHNOLOGY Co.,Ltd. Address before: 434000 No. 58, douhu Road, Shashi District, Jingzhou City, Hubei Province Patentee before: CHINA COMMUNICATION TECHNOLOGY(HUBEI) Co.,Ltd. |