CN101015146A - Means for receiving data via satellite using at least two polarisations - Google Patents
Means for receiving data via satellite using at least two polarisations Download PDFInfo
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- CN101015146A CN101015146A CNA2005800232968A CN200580023296A CN101015146A CN 101015146 A CN101015146 A CN 101015146A CN A2005800232968 A CNA2005800232968 A CN A2005800232968A CN 200580023296 A CN200580023296 A CN 200580023296A CN 101015146 A CN101015146 A CN 101015146A
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- data
- signal
- low noise
- noise block
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D9/00—Demodulation or transference of modulation of modulated electromagnetic waves
Abstract
Apparatus is provided which allows the simultaneous reception, processing and availability of digital data which is transmitted in both linear and circular polarity formats, thereby allowing data over a greater frequency bandwidth to be available for selection and for selection and processing of data of different polarity formats to be achieved simultaneously. This therefore means that there is now the practical possibility to allow the continued broadcast of data in a circular polarity format over existing bandwidths and the additional broadcast of data in a linear polarity format in the same geographical region and over a larger frequency bandwidth thereby enlarging the amount of data which can be transmitted, and received and the user selections which are available and ensuring that the linear and circular polarity format data can be received and processed and be available in response to a user selection simultaneously.
Description
The invention that this patent application relates to and the reception of numerical data and handle relevantly, wherein the general transmission system via satellite of this numerical data is from remote position emission.Receive these data to be used for processing and generation video and/or audio subsequently in building, this video and/or audio will be shown to the user of equipment in the building.
In case receive data in building, then these data will be handled by the broadcast data receiving system, in the broadcast data receiving system, can handle to allow to produce video, audio frequency and/or auxiliary data data.Especially,, use video, audio frequency and/or auxiliary data and can be used to produce TV programme or broadcast program, and the user that the response user makes via receiving equipment selects to produce specific program although this is not unique.
Traditionally, the receiving equipment in the building comprises outside installed device and internal unit.This external equipment comprises antenna or " teledish " with waveguide and low noise block (LNB).External equipment connects via cable usually, and the data that receive are sent to internal unit.User and internal unit are mutual, and this internal unit is a broadcast data receiver, and can produce the signal of indication user interactions some service conditions with permission control and selection LNB, and via cable this signal are sent to LNB.
Data generally are transmitted into outside receiving equipment or a plurality of receiving equipment from satellite or a plurality of satellite with circular polarity format (such as in the U.S.) or linear polarity format (such as in most European countries).These two kinds of systems all are effectively, but there is following problem in the system of traditional circular polarity format: available bandwidth is relatively limited, is generally 12.2 to 12.7GHz, and this arrives 12.7GHz with respect to 10.7 in the linear polarity format system.Yet should be noted that this application is not limited to these frequency bands, and it also is used to the CP and the LP frequency band that mix.Because to can watching the increase in demand of program scope, and thus at any given time the level of the data of required emission increase, therefore find the available bandwidth deficiency of the system of circular polarity format.Yet, because the receiving equipment of the extensive use of current circular polarity format and a large amount of circular polarity format has been installed in the building, therefore only begin form with linear polarization send all data commercial be unpractiaca, this is with unavailable because of all existing equipment.
In addition, although be well known that the LNB that can receive the transmission of linear polarization or circular polarity format is provided, known LNB need switch between two kinds of condition of acceptances, in two kinds of condition of acceptances, a kind ofly is used to receive linear polarity format, a kind ofly is used to receive circular polarity format.This means that LNB can only receive and handle a kind of in the signal of linear polarity format or circular polarity format at any time.Therefore, this means that all receiving equipments that are connected to LNB must receive the identical linear polarization or the signal of circular polarity format at any given time, and therefore can only receive subclass with the emission data of the sort of form emission.When considering following situation gradually: building has a plurality of broadcast data receivers that are connected to external equipment, and each in the receiver and the operation independently of one another of other receivers, select thereby can distinguish the user who makes simultaneously on different receivers, the operational factor of so current LNB is nonconforming.Can know also that from patent application US2004/0029549 have a kind of feasible system, it can receive orthogonal signalling at input, use homodromy (diplexer) that frequency band is divided into two then.Has 10% gap at least between the frequency band that uses homodromy to receive, in fact this mean, purposes for many expectations, the system of this patent application does not propose to solve the practical solution of current problem, and this is because the frequency band that often needs to receive is very close to each other between same frequency band.
The purpose of this invention is to provide and have reception more than a kind of receiving equipment of ability of data-signal of form and data-signal with two or more forms of reception and/or the LNB that receives the ability of the data-signal on two or more range of frequency bandwidths be provided, thereby allow a plurality of broadcast data receivers to connect receiving data from LNB, and with other described equipment independent operatings.
In a first aspect of the present invention, a kind of low noise block that is used for receiving equipment is provided, the frequency place that this receiving equipment is used in scheduled frequency range receives the data-signal of emission via satellite, and this receiving equipment comprises:
Be used for receiving simultaneously and handling the circuit of the data-signal that has two kinds of polarization at least on scheduled frequency range; And
Be used for producing audio frequency and/or video and selectivity and can respond the circuit that at least one is selected via the user of receiving equipment with recovering from data-signal.
In one embodiment, receive any bandwidth, or any data-signal with the combination of circular polarity format and linear polarity format on the combination of bandwidth or the overlapping bandwidth.In one embodiment, the alternate transponders on the satellite can have circular polarity format or linear polarity format, wherein receives data-signal from this satellite, and data-signal can be received by current equipment.
In one embodiment, LNB is provided with a series of intermediate frequency (IF) data output, and wherein the data-signal of Jie Shouing is sent to broadcast data receiver (BDR) to select in response to the user via BDR from these data outputs.
Usually, each in the delivery outlet is independent controlled, makes each delivery outlet can be connected to BDR, and each BDR can determine these data in response to specific BDR service conditions from LNB delivery outlet reception data separately.According to the present invention, each BDR can select to receive data in response to the user who makes via this BDR, and because LNB of the present invention can receive and the data of handling different bandwidth and/or different polarization simultaneously, therefore available data or program range of choice can not be subjected to being connected to the influence or the effect of other BDR service conditionss of other delivery outlets of this LNB, make all data always available among the BDR that is connected to this LNB each.
Usually, in the LNB that uses linear polarization and circular polarization treatment circuit, data-signal is handled, and be from different frequency ranges and/or have linear polarity format or circular polarity format regardless of this data-signal.
If the data-signal that receives comprises some data-signals with linear polarity format and some and has the data-signal of circular polarity format, the specific program of selecting by the user is determined the data that BDR uses subsequently so, and the data that will be used for the sort of form of this program send to BDR.For example, if the channel of the TV programme of selecting is from producing via the data-signal institute data carried by data with circular polarity format, select so by the handled block of data signals of circular polarization treatment circuit among the LNB, and this block is sent to BDR to be used to produce the video and the audio frequency of selected TV programme.
Usually, the data of all receptions are all processed, but at each constantly, each BDR only uses these all reception data of special ratios.
Usually, for every group of data-signal with circular polarization that is launched, this LNB comprises hybrid circuit (hybrid).
In one embodiment, data-signal is by waveguide and waveguide probe, and its data-signal that is used for receiving is divided into two data paths, and under the situation of circular polarization, these two data paths have 90 ° differing.Preferably, first and/or the second level amplifier by phase place and amplitude balanced then from the data of each data probe, be divided into two data circuits then with this its: first circuit, it arrives hybrid circuit with data passes, and continue to be delivered to another LNA level, for the data with circular polarity format, this another LNA level is done in order to the recombination data signal; And second circuit, its data that allow to have linear polarity format are correctly passed through.So for every data path, data are by the process circuit of circular polarity format and the process circuit of linear polarity format.In every circuit, if data have the linear polarization and the circular polarization of mixing, some data will correctly be handled so, and some then can not.For example, the data of linear polarity format can not be handled by the circular polarity data process circuit meaningfully, vice versa, but end at circuit, guarantee all data to have been carried out correct processing with a kind of in two kinds of processing form, and all data all are available for subsequently processing thus, to allow to produce audio frequency and/or video.
Usually, LNB comprises each the switching member that is connected in the delivery outlet, selects from the appropriate data of appropriate data processing line access to allow the response user.
In one embodiment, provide data with the piece form to BDR, each piece comprises all data in the data set of reception, promptly with the data of characteristic frequency or have the data of particular polarization, and selected certain data block is to comprise realizing producing the needed data of data that the user via BDR selects.
In one embodiment of the invention, the circuit of use comprises the probe that quadrature is placed.Preferably, the output of the probe on microstrip keeps the phase matched of probe on the frequency band of whole service.Owing to this reason, probe needs quadrature to place and be arranged in the same plane of waveguide.Can prevent waveguide medium frequency variation phase error like this, perhaps it is reduced to acceptable level, and can prevent from microstrip, to propagate the frequency change phase error in the waveguide that can not be corrected.
Usually, LNB comprises feed horn, and it is designed to allow under the situation without any differential phase shift, keeps the CP of 90 degree to differ on whole frequency band.
In a preferred embodiment, use the distributor (splitter) of 3dB to come the specified data circuit, and the have no reason frequency band of limit design of result.
Because the present invention, system can receive and handle mixed C P and the LP signal in the identical frequency band, and the satellite repeater that promptly replaces can be used in CP or the LP polarization.
Although be illustrated with reference to a power divider, but should be understood that, this equipment can comprise more than one power divider and can move with more than one power divider, make power generally can punish into two or mulitpath at the Wilkinson node.
In current equipment, needn't use homodromy, and therefore there is no need as the situation of prior art, between the frequency band of operation, provide the gap.
In one embodiment, this equipment is used to receive the data of linear polarization (LP) form at 11.7-12.2Ghz frequency place, and the data that receive circular polarization (CP) form at 12.2Ghz-12.7Ghz place.
In a preferred embodiment, the amplifier stage that is arranged on shunt this equipment before of data path is that phase place and amplitude are complementary, so that for the CP signal that will correctly be handled, keeps differing and amplitude balanced of 90 degree.
In another aspect of this invention, a kind of receiving equipment that is used for data-signal is provided, the frequency place of this data-signal in scheduled frequency range launches via satellite, described receiving equipment comprises LNB, it receives and process data signal in frequency range simultaneously, and wherein said data-signal is at least from two kinds of polarization, and described data are handled by LNB, and can be used at any given time selecting, thereby select in response at least one user via receiving equipment to produce audio frequency and/or video.
Referring now to accompanying drawing, specific embodiments of the invention are described, wherein:
The receiving equipment that Fig. 1 schematically illustrates in the building and provides with certain arrangement form, and this invention is very suitable for arrangement form;
Fig. 2 has illustrated first embodiment of the data circuit among the LNB; And
Fig. 3 has illustrated second embodiment of the data circuit among the LNB.
At first with reference to Fig. 1, it has illustrated in the building 2 according to receiving equipment of the present invention.This equipment comprises the antenna 4 that is installed in the building outside, and this antenna 4 comprises and is provided as the wherein LNB 6 of parts.Provide and be provided with antenna and LNB receiving data, these data are from one or the emission of a series of playback equipment and be transmitted into each building via satellite, thereby received by the antenna and the LNB at each described building place.This LNB is connected to a series of broadcast data receivers (BDR) 10,12,14 that are arranged in the building via coaxial cable 8, and it is not generally as shown in the chummery.Each BDR that is provided with is used for user interactions, makes the user can operate each BDR and irrelevant with other BDR, thereby selects specific TV programme.After the user selects to specify specific program, signal sends to LNB from BDR, to allow for selected program, and the data or the data block at desired data place offered BDR, to be used for handling and producing video and/or audio, thereby make the program of generation offer the user, generally offer the user via the TV 16 that is connected.
Referring now to Fig. 2 and 3, it has illustrated two embodiment that are arranged on according to the data circuit among the LNB of the present invention, and the data that receive are passed through along this data circuit.
In every width of cloth figure, for ease of reference, public element is with identical digital note.
The data that receive enter LNB along the direction of arrow 20, and data are divided into two data paths 24,26 with phase quadrature at point 22.The data that should be appreciated that all receptions are treated in the same manner, and pass through along two data paths 24,26 that limited as waveguide probe 22.
Then, the first order (and/or second level) low noise amplifier (LNA) of the data in every data path 24,26 by separately is to 28,30.This LNA is to the 28, the 30th, phase place and amplitude balanced.
Then, utilize Wilkinson power divider 36,38 that every data path 24,26 is divided into two data circuit 32a and 32b and 34a and 34b respectively separately.
Set up two data circuit 32a and 34a to allow correctly to handle the data of linear polarity format.Set up two circuit 32b and 34b allowing correctly to handle the data of circular polarity format, two circuit 32b and 34b are provided with the hybrid circuit 40 of 3dB, and every circuit be respectively arranged with second level LNA to 42,44 one of them.Every circuit 32a, 32b, 34a, 34b are provided with frequency mixer 46 and intermediate frequency amplifier 48, and via switch controlling device visit and selection data, wherein switch controlling device is with subsequent introduction at this.
Like this, by identical reception data, and these data can be circular polarity format and linear polarity format along every data path 24,26.This LNA is used for that data are had a mind to the free burial ground for the destitute and amplifies, with realization data are accurately handled, and it is also important that, data path and circuit all are symmetrical, therefore thereby guarantee the minimal error in the data, and guarantee that data are acceptable and in the scope of admissible error parameter for subsequently processing.
For this example, these data are circular polarization and linear polarity format, and data of description is passed through along data path 24 now, in case these data then are divided into two circuit 32a and 32b by LNA 28.It all is that linear polarity format is handled that the data that road 32a along the line passes through are taken as, so the data of linear polarity format will correctly be handled, rather than the data of linear polarity format then can not correctly be handled.In circuit 32b, it all is that circular polarization is handled that data are taken as, and so in this case, the data of circular polarization are correctly handled, and the data of linear polarity format then can not correctly be handled.
This repeats in data circuit 34a and 34b, makes that the data from the linear polarity format of the output of data path 32a and 34a are available, and is available from the data of the circular polarization of the output of circuit 32b and 34b.When circular polarity data component road 32b along the line and 34b by the time, they are separated by the counteracting in the hybrid circuit of 3dB.
When in circuit, providing two when handling route, the two process circuit that provide in every data path and two data paths and circuit element symmetry allow to handle simultaneously and provide data, and no matter these data are circular polarity format or linear polarity format and/or no matter these data are identical form or different forms in different scheduled frequency ranges.
Therefore, any given instantaneous, the data of all appropriate forms all can be selected via the switch controlling device among the switch controlling device among Fig. 2 50 and Fig. 3 53.
In Fig. 2, switch is four to select a switch, this means to have the IF output 54 that can be connected to a BDR.Therefore, in this arrangement, at the BDR place of specific television program, the signal that the expression user selects sends to switch 50.This signal allows the position of this specific television program desired data of identification, and the output of switch visit data path, and the wherein required circular polarity format or the data of linear polarity format or data block are positioned at this output.Then, the data that identify are by switch 50, guide BDR into via output 54, and this BDR deal with data is to produce the video and/or audio of selected TV programme then.
In Fig. 3, switch 52 is 4 to select 4 switches, this means that it has four IF outputs 56,58,60,62.In these IF outputs each all can be connected to BDR, and each all allows to be independent of other outputs and provides data to each BDR.
Like this, for example, if the BDR that is connected to IF output 56 is controlled, produce the TV programme that the user selects in order to data from the circular polarity format that received, so the data of handling via path 32b and 34b are available, and are drawn towards IF output 56 from the data or the data block of appropriate data path output.If simultaneously the BDR that is connected to IF output 60 is controlled, produce user selected program in order to data from the linear polarity format that received, these data are correctly handled via path 32a and 32b so, and be available equally therefore, and therefore guide required data or data block into IF output 60.
Among the optional embodiment that specifies herein and particularly arrange about output,, each can be combined as the combination in any of single or multiple outputs to the IF data path of delivery outlet by using homodromy at output.In this arrangement, needn't provide the switch arrangement described in the figure.
Therefore, according to the present invention, a kind of LNB and treatment facility are provided, it allows to receive simultaneously, handle and utilizes the data of launching with linear polarity format and circular polarity format, allowing the data on the bigger frequency bandwidth thus is available for selecting, and is used to realize simultaneously the data of different polarization are selected and handled.Therefore this means, the shape property that has following reality now, promptly allow the data of circular polarity format on existing bandwidth, to continue broadcasting, and allow data additional broadcast on identical geographic area and bigger frequency bandwidth of linear polarity format, therefore, increase the data that are launched, and increased available user's selection, and guarantee the free and user's selection that makes an immediate response in institute, receive, handle and utilize the data of linear polarization and circular polarity format.
Claims (21)
1, the frequency place that a kind of low noise block that is used for receiving equipment, this receiving equipment are used in scheduled frequency range receives the data-signal of emission via satellite, and described receiving equipment comprises:
Be used for receiving simultaneously and handling the circuit of the data-signal that has two kinds of polarization at least in described scheduled frequency range; And
Be used for producing audio frequency and/or video and selectivity and can respond the circuit that at least one is selected via the user of receiving equipment with recovering from data-signal.
2, the described low noise block of claim 1 wherein is received in the data-signal with the combination of circular polarity format and linear polarity format on the combination of any bandwidth in the described scheduled frequency range, any bandwidth or the overlapping bandwidth.
3, the described low noise block of claim 2, wherein the alternate transponders on the satellite has circular polarity format or linear polarity format respectively, wherein receives data-signal from described satellite.
4, the described low noise block of claim 3, wherein said low noise block also comprises a plurality of intermediate frequencies (IF) data output, the user that each data output is used to respond via broadcast data receiver selects, and the data-signal that receives is outputed to described broadcast data receiver.
5, the described low noise block of claim 4, in the wherein said data output each is independent controlled, optionally output to the broadcast data receiver that is connected with the data-signal that will receive, in response to the service conditions of each specific broadcast data receiver, determine the data-signal of being exported.
6, the described low noise block of claim 5, wherein each broadcast data receiver is used to respond the user who makes via this broadcast data receiver and selects to receive data, and wherein available data or available program range of choice can not be subjected to being connected to the influence of service conditions of other broadcast data receivers of other data outputs of described low noise block.
7, the described low noise block of claim 6 also comprises: the linear polarization treatment circuit is used to handle the data-signal with linear polarity format; And the circular polarization treatment circuit, be used to handle data-signal with circular polarity format.
8, the described low noise block of claim 7, wherein the data-signal that is received comprises data-signal with linear polarity format and the data-signal with circular polarity format, and described low noise block is also based on the user's selection of specific program and the data mode of this program that has sent, to the broadcast data receiver dateout.
9, the described low noise block of claim 6, wherein said low noise block also comprises waveguide, the data-signal that is used for being received is divided into first data path and second data path.
10, the described low noise block of claim 9 also comprises:
The amplifier circuit that is used for every data path, it is phase place and amplitude balanced, and is used to amplify corresponding data-signal;
The demultiplexer circuit that is used for every data path, be used for data-signal is divided into first and second data circuits, wherein said first data circuit be used to the to recombinate data-signal of data-signal of circular polarity format, and wherein said second data circuit is used for the data-signal by linear polarity format.
11, the described low noise block of claim 9, the amplifier circuit of wherein said every data path are that phase place and amplitude are complementary, thereby keep the phase quadrature and the amplitude balanced of the data-signal of circular polarity format.
12, the described low noise block of claim 11 also comprises:
Switching circuit, be connected to each of data output and from selected data processing line access data to select in response to the user.
13, the described low noise block of claim 12, the data-signal that wherein offers broadcast data receiver provides with the piece form, each piece comprises the data in the data set of reception, this data set comprises the data of characteristic frequency or has the data of particular polarization, and selected data block comprises that realization produces the needed data of data that are used for via user's selection of described broadcast data receiver.
14, the described low noise block of claim 9, wherein said waveguide comprises the probe about orthogonal placement.
15, the described low noise block of claim 14, wherein said waveguide is used for keeping phase matched on the frequency band of whole service.
16, the described low noise block of claim 15 also comprises feed horn, is used under the situation that does not have differential phase shift substantially, keeps 90 ° circular polarization to differ on the frequency band of whole service.
17, the described low noise block of claim 15, wherein said allotter circuit comprises the 3dB distributor.
18, the described low noise block of claim 15, wherein said allotter circuit is used for described data-signal is divided into many data circuits.
19, the described low noise block of claim 15, wherein very close to each other between the frequency band of operation.
20, the described low noise block of claim 15 wherein first receives data-signal and is in 11.7-12.2GHz, and be linear polarization (LP) form, and the second reception data-signal is in 12.2-12.7GHz, and is circular polarization (CP) form.
21, the receiving equipment that is used for data-signal, wherein the frequency place of this data-signal in scheduled frequency range sends via satellite, described receiving equipment comprises low noise block (LNB), it receives and process data signal on described frequency range simultaneously, and wherein said data-signal is from two kinds of polarization at least, and described data are handled via LNB, and be available for selecting at any given time, select thereby respond at least one user, produce audio frequency and/or video via described receiving equipment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0410377A GB0410377D0 (en) | 2004-05-11 | 2004-05-11 | Dual polarisation receiving means |
| GB0410377.6 | 2004-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101015146A true CN101015146A (en) | 2007-08-08 |
Family
ID=32526743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800232968A Pending CN101015146A (en) | 2004-05-11 | 2005-05-11 | Means for receiving data via satellite using at least two polarisations |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1763931A1 (en) |
| CN (1) | CN101015146A (en) |
| CA (1) | CA2569594A1 (en) |
| EA (1) | EA010643B1 (en) |
| GB (1) | GB0410377D0 (en) |
| UA (1) | UA92321C2 (en) |
| WO (1) | WO2005109703A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7474173B2 (en) | 2006-06-27 | 2009-01-06 | Asc Signal Corporation | Cross-polar and co-polar transceiver |
| ATE474388T1 (en) | 2006-11-03 | 2010-07-15 | Rf Magic Inc | FREQUENCY TRANSMISSION AND STACKING OF SATELLITE SIGNALS |
| WO2008089318A2 (en) | 2007-01-19 | 2008-07-24 | Rf Magic, Inc. | Translational switching system and signal distribution system employing same |
| GB201416915D0 (en) * | 2014-09-25 | 2014-11-12 | Global Invacom Ltd | Apparatus for selected provision of linear and/or circular polarity signals |
| GB201912134D0 (en) * | 2019-08-23 | 2019-10-09 | Global Invacom Ltd | Apparatus for receiving and transmitting data via a satellite using at least two polarisations |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3414604B2 (en) * | 1996-12-27 | 2003-06-09 | シャープ株式会社 | Two-output low-noise downconverter circuit |
| US6424817B1 (en) * | 1998-02-04 | 2002-07-23 | California Amplifier, Inc. | Dual-polarity low-noise block downconverter systems and methods |
| JP3562985B2 (en) * | 1999-01-27 | 2004-09-08 | アルプス電気株式会社 | Converter for satellite broadcasting reception |
| US6507952B1 (en) | 1999-05-25 | 2003-01-14 | Rockwell Collins, Inc. | Passenger entertainment system providing live video/audio programming derived from satellite broadcasts |
| JP2001016128A (en) * | 1999-06-30 | 2001-01-19 | Maspro Denkoh Corp | Converter for two satellite receiving antenna |
| US6931245B2 (en) * | 2002-08-09 | 2005-08-16 | Norsat International Inc. | Downconverter for the combined reception of linear and circular polarization signals from collocated satellites |
| JP2004140594A (en) * | 2002-10-17 | 2004-05-13 | Sharp Corp | Satellite broadcast receiver |
-
2004
- 2004-05-11 GB GB0410377A patent/GB0410377D0/en not_active Ceased
-
2005
- 2005-05-11 WO PCT/GB2005/001812 patent/WO2005109703A1/en active Application Filing
- 2005-05-11 CN CNA2005800232968A patent/CN101015146A/en active Pending
- 2005-05-11 EP EP05747223A patent/EP1763931A1/en not_active Withdrawn
- 2005-05-11 EA EA200602078A patent/EA010643B1/en not_active IP Right Cessation
- 2005-05-11 UA UAA200612967A patent/UA92321C2/en unknown
- 2005-05-11 CA CA002569594A patent/CA2569594A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EA200602078A1 (en) | 2007-06-29 |
| EP1763931A1 (en) | 2007-03-21 |
| UA92321C2 (en) | 2010-10-25 |
| WO2005109703A1 (en) | 2005-11-17 |
| GB0410377D0 (en) | 2004-06-16 |
| EA010643B1 (en) | 2008-10-30 |
| CA2569594A1 (en) | 2005-11-17 |
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Application publication date: 20070808 |