CN103762995B - Signal receiving unit and its implementation - Google Patents
Signal receiving unit and its implementation Download PDFInfo
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- CN103762995B CN103762995B CN201410041457.7A CN201410041457A CN103762995B CN 103762995 B CN103762995 B CN 103762995B CN 201410041457 A CN201410041457 A CN 201410041457A CN 103762995 B CN103762995 B CN 103762995B
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Abstract
The invention discloses a kind of signal receiving unit and its implementation, comprise the first signal path and secondary signal path, in first signal path, first polar signal is through ceramic low pass filter process, in secondary signal path, second polar signal is through ceramic high pass filter, processes, then the first polar signal after treatment and the second polar signal are integrated, pottery high pass filter and ceramic low pass filter can reduce the interference of adjacent channel, can effectively remove unwanted frequency band, thus the interference between reduction frequency band, improve signal to noise ratio, make signal picture more clear.
Description
Technical field
The invention belongs to signal transacting field, more precisely, relate to the process of satellite-signal.
Background technology
Present satellite-based system is increasingly used for TV transmission program.Usually, One Earth One Family synchronous satellite receives ground signal, and down link signal is to the ground-plane antenna being 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 of Received signal strength.
In order to increase the bandwidth from satellite-signal, signal sends at the two poles of the earth.Such as, the bandwidth of satellite-signal can be made to double when the two poles of the earth are out-phase 90 °.They by single polarized signal separately, and must be sent to reception receiving unit by the low noise module of ground-plane antenna.
Sometimes, be difficult to receive best satellite-signal.Such as, the reception that can reduce other channel may be disturbed from a broadcasting channel.Concerning user, this can cause the definition step-down of image, signal to noise ratio 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:
First polar signal input of low noise module loop, for receiving the input of the first polar signal, the frequency range of described 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;
The frequency mixer being coupled with 10.75GHZ local oscillator be coupled with the first amplifying stage, for receiving the first polar signal after amplification, and converts thereof into the secondary signal of 950 to 1450MHz;
With the first intermediate frequency amplifier of mixer couples being coupled with 10.75GHZ local oscillator, for receiving secondary signal, and the ceramic low pass filter be coupled with the first intermediate frequency amplifier;
Secondary signal path, comprising:
Second polar signal input of low noise module loop, for receiving the input of the second polar signal, the frequency range of described 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;
The frequency mixer being coupled with 10.10GHZ local oscillator be coupled with the second amplifying stage, for receiving the second polar signal after amplification, and converts thereof into the 3rd signal of 1600 to 2100MHz;
With the second intermediate frequency amplifier of mixer couples being coupled with 10.10GHZ local oscillator, for receiving the 3rd signal, and the ceramic high pass filter be coupled with the second intermediate frequency amplifier.
Preferably, also comprise:
Signal synthetic apparatus, is communicated with the secondary signal through ceramic low pass filter, and through the 3rd signal of ceramic high pass filter.
Preferably, described first amplifying stage is casacade multi-amplifier.
Preferably, described second amplifying stage is casacade multi-amplifier.
Present invention also offers a kind of method realizing above-mentioned signal receiving unit, comprise the steps:
In the first path, the first polar signal after amplifying be coupled with the mixer couples of 10.75GHZ local oscillator, change into the secondary signal of 950 to 1450MHz; Secondary signal, after the first intermediate frequency amplifier amplifies, carries out filtering through ceramic low pass filter;
In alternate path, second polar signal after amplifying be coupled with the mixer couples of 10.10GHZ local oscillator, change into the 3rd signal of 1600 to 2100MHz, the 3rd signal through second intermediate frequency amplifier amplify after, 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, thus reduce the interference between frequency band, improve 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 realizing signal receiving unit of the present invention.
Embodiment
The technical problem solved to make the present invention, the technical scheme of employing, the technique effect easy to understand obtained, below in conjunction with concrete accompanying drawing, be described further the specific embodiment of the present invention.
Fig. 1 shows the parts of the satellite-signal distribution system 100 in the embodiment of the present invention.In FIG, earth-orbiting satellite 101 sends down link signal 102, and by the antenna system reception be made up of antenna bay 105 and loop assembly 106.
In an embodiment of the present invention, loop assembly 106 comprises a lnb feed horn (tuner), and this belongs to the common practise of this area.Usually, tuner comprises a circuit, is used for amplifying, and frequency down-converts down link signal 102 is intermediate frequency, its together with feed horn from antenna bay 105 receiving downlink signal.In an embodiment of the present invention, down link signal 102 is the Ku band signal of 11.7GHz to 12.7GHz.
In an embodiment of the present invention, system 100 further comprises a receiver 110, and it to be normally coupled with feedback device assembly 106 by coaxial cable and to communicate.Receiver 110 receives the intermediate-freuqncy signal from loop assembly 106, selects the specific TV channel of display on TV 111 subsequently.
Fig. 2 is the schematic diagram according to signal receiving circuit in the embodiment of the present invention 200.According to embodiments of the invention, signal receiving circuit 200 is the part in the assembly of loop shown in Fig. 1 106.It should be noted that for simplicity, some occur that assembly in fig. 2 will be not described in detail.In fig. 2, signal receiving circuit 200 comprises the first signal path 210 for receiving downlink signal 102 and secondary signal path 220.In an embodiment of the present invention, the first signal path 210 comprises the first polar signal input 201 for receiving the first polar signal.First polar signal can be the signal of a perpendicular polarization.In one embodiment of this invention, the first polar signal is right-hand polarized signals.In another embodiment, the first polar signal is left-hand polarized signals.
In the present invention, the first signal path 210 also comprises amplifying stage 202, before signal is mixed to required frequency, is amplified in advance by signal.In one embodiment, amplifying stage 202 comprises a High Electron Mobility Transistor as low noise amplifier (LNA) (HEMT).In one embodiment, amplifying stage 202 is made up of GaAs technology.In one embodiment, amplifying stage 202 is 3 grades of amplifiers.In another embodiment of the invention, amplifying stage 202 is two-stage or one-stage amplifier.In one embodiment, the first signal path 210 also comprises a band pass filter 203 to remove unwanted frequency component.In one embodiment, band pass filter 203 is a microstrip bandpass filter.
In one embodiment, the first signal path 210 also comprises the frequency mixer 205 that is coupled with 10.75GHZ local oscillator 204.In one embodiment, frequency mixer 205 comprises a diode, as Schottky diode.In another embodiment, frequency mixer 205 comprises a field-effect transistor (FET).In another embodiment, frequency mixer 205 comprises monolithic integrated microwave circuit (MMIC).It should be noted that and be not limited to above-mentioned specifically described mixer at embodiments of the invention.
In one embodiment, the first signal path 210 comprises intermediate frequency amplifier 206 further.In one embodiment, intermediate frequency amplifier 206 is a dual-stage amplifier.In one embodiment, every grade of amplifier is distinguished by respective saturated bearing power.
In one embodiment, the first signal path 210 also comprises the ceramic low pass filter 207 be coupled with intermediate frequency amplifier 206.Pottery low pass filter 207 makes the signal of expectation pass through and remove unwanted frequency signal.
In one embodiment, ceramic low pass filter 207 has the band resistance of at least 30 decibels.In embodiments of the present invention, ceramic low pass filter 207 is coupled with signal synthetic apparatus 230.
Secondary signal path 220 comprises the second polar signal input 221 for receiving the second polar signal.
In the present invention, secondary signal path 220 comprises amplifying stage 222, before signal is mixed into required frequency, by signal pre-amplification in advance.
In one embodiment, amplifying stage 222 comprises a High Electron Mobility Transistor as low noise amplifier (LNA) (HEMT).
In one embodiment, amplifying stage 222 is made up of GaAs technology.Amplifier stage 222 is 3 grades of amplifiers; In other embodiments of the invention, amplifying stage 222 is two-stage or one-stage amplifier.
Secondary signal path 220 also comprises a band pass filter 223 to remove unwanted frequency component.In a specific embodiment, band pass filter 223 is a microstrip bandpass filter.
First signal path 220 also comprises the frequency mixer 225 that is coupled with 10.1 gigahertz local oscillators 224.Frequency mixer 225 can be a diode, as the example of Schottky diode.In another embodiment, frequency mixer 225 is field-effect transistors (FET).In another embodiment, frequency mixer 225 is a monolithic integrated microwave circuit (MMIC).It should be noted that and be not limited to above-mentioned specifically described mixer at embodiments of the invention.
Secondary signal path 220 also comprises an intermediate frequency amplifier 226.In one embodiment, intermediate frequency amplifier 226 comprises a dual-stage amplifier.In one embodiment, every grade of amplifier is distinguished with respective saturated bearing power.
Secondary signal path 220 also comprises the ceramic high pass filter 227 be coupled with intermediate frequency amplifier 226.Pottery high pass filter 227 is to allow the signal needed pass through and to remove unwanted frequency signal.In an embodiment of the present invention, ceramic high pass filter 227 has the band resistance of at least 30 decibels.In embodiments of the present invention, ceramic high pass filter 227 is coupled with signal synthetic apparatus 230.
In operation, downstream signal 102 comprises 10 passages of the first polarity in 10 passages of the first polarity (such as, vertical polarization) and the second polarity (as horizontal polarization).In another embodiment, described first polarity is clockwise or counterclockwise polarity, and the second polarity is counterclockwise or clockwise polarity.
The signal of perpendicular polarization signal in down link signal 102 with 10.75 gigahertzs from local oscillator 204 mixes by frequency mixer 205, has the intermediate-freuqncy signal of 950 megahertzes (MHz) to 1450 megahertzes to produce one.Identical, the signal of the horizontal polarization signals in down link signal 102 with 10.1 gigahertzs from local oscillator 224 mixes by frequency mixer 225, to produce the intermediate-freuqncy signal that has 1600 megahertz to 2100 megahertzes.
In an embodiment of the present invention, the intermediate-freuqncy signal exported from intermediate frequency amplifier 206 is imported into ceramic low pass filter 207.Equally, the intermediate-freuqncy signal exported from intermediate frequency amplifier 226 is imported into ceramic high pass filter 227.Compared with traditional tuner, the ceramic filter (such as, the low pass filter 207 of pottery and the high pass filter 227 of pottery) used in the present invention has excellent effect.Pottery high pass filter 227 and ceramic low pass filter 207 can reduce the interference of adjacent channel.More specifically, compared with traditional design, embodiments of the invention at least improve the Out-of-band rejection of 30 decibels.And design of the present invention can effectively remove unwanted frequency band.Thus the interference between reduction frequency band, improve signal to noise ratio, TV 111 is shown more clear.
In an embodiment of the present invention, apply two different local oscillators (204,224), respective polar signal is converted into the intermediate-freuqncy signal of 950 to 2100 megahertzes.Signal synthetic apparatus 230 receives from the intermediate-freuqncy signal of 950-1450MHz in the first signal path 210 and from 1600 to 2100 intermediate-freuqncy signals in secondary signal path 220.
Fig. 3 is the flow chart realizing signal receiving unit of the present invention.In step 310, in the first signal path, ceramic low pass filter process is utilized to input to the first polar signal in lnb feed horn.With reference to the description of figure 2, the first polar signal (such as, a vertical polarity, with clockwise polarity, or polarity counterclockwise) processed by the loop assembly 106 in the first signal path 210.In an embodiment of the present invention, the first signal path 210 comprises ceramic low pass filter 207.
Step 320: in secondary signal path, utilizes 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 (such as, the polarity of a level, clockwise or anticlockwise polarity) is processed by the loop assembly 106 in secondary signal path 220.In an embodiment of the present invention, secondary signal path 220 comprises ceramic high pass filter 227.
As discussed above, embodiments of the invention, relative to traditional design, have larger Out-of-band rejection and decay, and the interference between frequency band is few, improves 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, to the change of each execution mode with to increase also be that one of ordinary skill in the art institute is apparent.Being intended that all these changes and increasing of applicant has all dropped in scope that the claims in the present invention protect.
Similar numbering refers to similar element in the whole text.For clarity, the situation of some line, layer, element, parts or feature being amplified may be had in the accompanying drawings.
Term used herein is only and is illustrated specific embodiment, and it is also not intended to limit the invention.Unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) are all identical with the understanding of one of ordinary skill in the art of the present invention.
Claims (4)
1. a signal receiving unit, is characterized in that comprising:
First signal path, comprising:
First polar signal input of low noise module loop, for receiving the input of the first polar signal, the frequency range of described 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;
The frequency mixer being coupled with 10.75GHZ local oscillator be coupled with the first amplifying stage, for receiving the first polar signal after amplification, and converts thereof into the secondary signal of 950 to 1450MHz;
With the first intermediate frequency amplifier of mixer couples being coupled with 10.75GHZ local oscillator, for receiving secondary signal, and the ceramic low pass filter be coupled with the first intermediate frequency amplifier; Secondary signal path, comprising:
Second polar signal input of low noise module loop, for receiving the input of the second polar signal, the frequency range of described 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;
The frequency mixer being coupled with 10.10GHZ local oscillator be coupled with the second amplifying stage, for receiving the second polar signal after amplification, and converts thereof into the 3rd signal of 1600 to 2100MHz;
With the second intermediate frequency amplifier of mixer couples being coupled with 10.10GHZ local oscillator, for receiving the 3rd signal, and the ceramic high pass filter be coupled with the second intermediate frequency amplifier; And signal synthetic apparatus, be communicated with the secondary signal through ceramic low pass filter, and through the 3rd signal of ceramic high pass filter.
2. signal receiving unit according to claim 1, is characterized in that: described first amplifying stage is casacade multi-amplifier.
3. signal receiving unit according to claim 1, is characterized in that: described second amplifying stage is casacade multi-amplifier.
4. 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 after amplifying be coupled with the mixer couples of 10.75GHZ local oscillator, change into the secondary signal of 950 to 1450MHz; Secondary signal, after the first intermediate frequency amplifier amplifies, carries out filtering through ceramic low pass filter;
In alternate path, second polar signal after amplifying be coupled with the mixer couples of 10.10GHZ local oscillator, change into the 3rd signal of 1600 to 2100MHz, the 3rd signal through second intermediate frequency amplifier amplify after, through ceramic high pass filter filters; And
By filtered secondary signal, the 3rd signal integration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 CN103762995A (en) | 2014-04-30 |
| CN103762995B true CN103762995B (en) | 2016-03-09 |
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| CN107294547B (en) * | 2017-08-07 | 2019-09-06 | 华讯方舟科技有限公司 | A kind of microwave frequency changer circuit and microwave converter |
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| JP4639809B2 (en) * | 2005-01-17 | 2011-02-23 | パナソニック株式会社 | Electronic tuner and portable 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 |
| TW200926575A (en) * | 2007-12-10 | 2009-06-16 | Wistron Neweb Corp | Down-converter having 90 degree hybrid coupler with open-circuit transmission line(s) or short-circuit 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 |
| CN103259990B (en) * | 2013-03-21 | 2016-04-06 | 宁波森富机电制造有限公司 | A kind of four local oscillator lists export Ku wave band tuner |
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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. |