CN1096910A - Adopt the radio frequency broadcasting systems and the method for two low-cost geosynchronous satellites - Google Patents
Adopt the radio frequency broadcasting systems and the method for two low-cost geosynchronous satellites Download PDFInfo
- Publication number
- CN1096910A CN1096910A CN93107630A CN93107630A CN1096910A CN 1096910 A CN1096910 A CN 1096910A CN 93107630 A CN93107630 A CN 93107630A CN 93107630 A CN93107630 A CN 93107630A CN 1096910 A CN1096910 A CN 1096910A
- Authority
- CN
- China
- Prior art keywords
- signal
- satellite source
- frequency
- satellite
- broadcasting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Radio Relay Systems (AREA)
Abstract
By utilizing two geostationary satellites that are on the same track to transmit identical signal basically simultaneously, thereby multichannel decline and foliage decay have been eliminated basically, provide high-quality audio broadcasting with radio frequency to earth surface or near mobile receiver, allowed to utilize space section cheaply.
Description
In the past few years, FCC (FCC) and International Telecommunications Union (ITU) the someone advise, from geostationary satellite to mobile platform (as automobile) and other movably and the receiver broadcast radio program in the fixing occasion.Because geostationary satellite is positioned at apart from the about 42300 kilometers nearly equatorial orbit of earth surface, is inactive state with respect to ground observer.Satellite can be observed about 1/3rd of earth surface under it, so radio broadcasting also can cover this anti-big zone, then be the principal character of radio broadcast via satellite as a country because tens million of square kilometres overlay area of the radio broadcast service that this potential the providing in very little zone run through ConUS (or other country /region) only is provided at common ground AM/FM radio broadcasting station so perhaps utilize directive antenna on the satellite only to cover a zonule.
Radio broadcast via satellite receives in the still fixed location of moving all will use special receiver, and this is because the requirement of technical measures and Frequency Distribution/interference is limit.Therefore, in order to set up such system, advised using the UHF frequency in about 300-3000MHz scope.Fig. 1 has shown typical radio broadcast via satellite system.Other satellite also can use to provide extra or additional channel or the two to have both at the same time with the satellite among Fig. 1 is common.Fig. 1 shows most important transmission path, the path from satellite to mobile or fixed platform.Since mobile platform need one can be at the antenna of all orientation and most elevations angle receiving satellite signal, so the mobile platform antenna gain must lower (for example, relatively more typical gain be 2-4dB).For this reason, satellite must make the receiver of mobile platform can receive the appropriate signals level by the bigger radio-frequency emission power of radiation.
Except satellite needs the transmitter of higher-wattage, also need extra transmitting power, be called " emission margin ", to overcome multichannel decline and foliage decay.The multichannel decline betides the situation that satellite-signal is received by two or more paths by the mobile platform receiver.One paths is direct visual route (line-of-sight) or desired path.At another paths, the signal that satellite sends is at first from ground, and building or truck reflection are received by the mobile platform receiver, as shown in Figure 2 then.Disturb in these other paths, and its degree depends on the factors such as loss that take place in the reflection process.
The method that being used in radio system reduces the multichannel decline has following several:
Between transmitter and receiver for desired signal provides the second path, this path is different from first path of this signal physically.This is called space diversity, and uses when one of two paths are influenced strongly by the multichannel decline at any time;
Between transmitter and receiver for desired signal provides second transmission frequency, be called frequency diversity, and use when one of two frequencies influences strongly by multichannel decline at any time;
3. the signal modulation that the decline of opposing multichannel is provided is as the broadening frequency spectrum.This method be when being formed certain opposing by bigger modulating frequency bandwidth, and receiver works when refusing certain opposing that undesirable broadening sign indicating number forms.
For the radio broadcast via satellite system that works in the UHF frequency, estimation, big scope have been measured and have protected by the expert about 9-12dB in order to overcome the emission margin that multichannel declines or the foliage decay is required.Multichannel decline and foliage decay take place seldom simultaneously fortunately.But meaning satellites transmits power, the 9-12dB emission margin must increase 9-12dB again at original maximum level.The radio broadcasting satellite that works in this power level will be very huge, complicated and expensive.At present, owing to its expensive not this kind business system comes into operation.
System and method of the present invention has overcome above problem, promptly almost side by side sends identical radio signals to reduce the influence of multichannel decline and foliage decay, as shown in Figure 3 by two or three geostationary satellite sources of separating certain track radian.
Move or fixed platform on receiver receive two signals by two physically different paths in the mode of space diversity, and select stronger signal or two signals combined.The modulation that this signal can utilize the opposing multichannel to disturb on identical frequency, or on different radio frequencies, the modulation that utilizes or do not utilize the opposing multichannel to disturb.Come across two satellites because tree or foliage are few extremely in the direct-view path at synchronization.
In most preferred embodiment, the radio broadcasting that these system and methods provide from geostationary satellite only need single satellite power demand 1/8th or still less.Because the cost of satellite directly is directly proportional with the transmitting power of satellite, thus the cost of the employed satellite of radio broadcasting system of the present invention be single satellite system cost 1/8th or still less.Reduce the satellite quality and also can allow to use the low-cost emission of low capacity delivery vehicle.Both made and utilized two emission delivery vehicles, the cost of the satellite portion of system of the present invention also to only reach about 25% of single satellites transmits system.
Because eliminated many obstacle losses, native system has improved the quality of reception basically.The obstacle loss occurrence is in the visual circuit that is in when object such as building or mountain peak between satellite and the receiver time.As shown in Figure 4, the obstacle loss betides two satellite path simultaneously.Foliage signal attenuation also is shown among Fig. 4 has been reduced, because this decay results from the part signal obstacle.
The present invention relates to a kind of system of two or more satellites, these satellites are the position that separates of identical geostationary orbit operation substantially aloft, each is all preferably in the frequency range with 300-3000MHz, basic simultaneously at the earth's surface or near receiver send or the identical radio signals of transfer.The apart of satellite is enough to reduce the multichannel decline, and foliage is decayed or reduced simultaneously.Preferably separate about 25 °-50 ° between any two satellites.These signals are preferably digital modulation realizing high-fidelity, but also can be for simulation.
System and method of the present invention can be understood better with reference to accompanying drawing, wherein:
Fig. 1 has shown the UHF radio broadcasting satellite system of utilizing single satellite source;
Fig. 2 has shown the multichannel decay of the UHF radio broadcasting that betides satellite;
Fig. 3 has shown and utilizes two to be in the substantially embodiment of the UHF radio frequency broadcasting systems of the satellite source of the apart of same geostationary orbit according to the present invention;
Fig. 4 has shown the situation that reduces all or part of obstacle loss decay among Fig. 3 in the binary-star system;
Fig. 5 has shown single relationship type frequency radio broadcast via satellite receiver altogether, is used with the dual-satellite system embodiment shown in Fig. 3 and Fig. 4;
Fig. 6 shown with Fig. 3 and Fig. 4 in be used one two relationship type of dual-satellite system embodiment radio broadcast via satellite receiver frequently altogether;
Fig. 7 has shown the double frequency satelline radio receiver that the two broadcasting-satellite system embodiment in Fig. 3 and 4 use.
Among the common frequency embodiment in Fig. 5 and Fig. 6, being in basically, two satellites of same geostationary orbit send or the essentially identical signal of transfer with essentially identical frequency.As a result, receiving the receiver of this radio signal can be very simple and cost is low.The modulator approach of using is preferably resisted multichannel and is disturbed and prevent to cause disturbing certainly mutually of signal jump.Preferably use broadening spectrum modulation (for example, direct order or frequency agility) to realize Code Division Multiplex (CD-MA).
The receiver that uses in mobile platform such as vehicle is preferably standard, and single channel is order broadening frequency spectrum detection device directly.This device can be from system arbitrary satellite picked up signal sign indicating number.The sign indicating number that is used for two satellite-signals is preferably identical, and this can be by allowing the satellite reception realize from the signal that will be sent to mobile receiver of the connecting station on ground.This connecting station one of two sign indicating numbers of can delaying time in time obtain quickly allowing.In mobile receiver, when descending one, signal level is lower than the fixing predetermined amount of threshold value, and as the amount greater than 2dB, the sign indicating number ring is opened, and only catches any signal that is better than threshold value, shown in Fig. 5 block diagram.In Fig. 5, antenna receives from each radiofrequency signal in two satellites.Signal is amplified by radio frequency amplifier.Specific intermediate frequency is selected by the frequency of local oscillator.On basis at random, obtain and detect one of two signals by broadening frequency spectrum demodulator, and another signal is left in the basket.The signal level of detection signal is delivered to signal level memory and threshold compataror.Deliver to audio frequency amplifier and loud speaker then so that listen to.The signal level memory receives detection signal level continuously and itself and the signal level value of before having sent is compared.Be forced to obtain again signal when the current value of signal level is low in certain amount (promptly give and put thresholding) broadening frequency spectrum demodulator, and reentried greater than the signal of threshold level value until signal level.
In addition, the receiver in the mobile platform can have public antenna, radio frequency and intermediate frequency (IF) equipment.IF is fed to two correlators, and each is called independently a broadening Spectrum Code acquisition cuicuit and a testing circuit, as shown in Figure 6.
In Fig. 6, antenna receives from each radiofrequency signal in two satellites.This signal is amplified by radio frequency amplifier.Convert signal to intermediate frequency (IF) from radiofrequency signal by down-converter.Specific intermediate frequency is selected by the frequency of local oscillator, down-converter output is divided into two parts by dispenser, and deliver to each broadening frequency demodulator acquisition and detect one of binary signal, this two signal or utilize the different sign indicating number prefaces of each signal to discern also can utilize the prior time migration between two signal same code prefaces to discern.Each broadening frequency spectrum demodulator is with detection signal or deliver to amplitude sensitive switch (signal of its output strong (high level) supplies with amplifier and loud speaker is used to listen to) or deliver to phase corrector and adder (its changes signal phase makes its homophase and addition).Addition result delivers to audio frequency amplifier and loud speaker is used to listen to.In addition, phasing can be realized in broadening frequency spectrum demodulator.Can be basic identical from the signal code of satellite but skew or mutually orthogonal were arranged on the time.Each detection signal all obtains from correlator.These signals can be selected separately, or the output signal of the single addition of generation that mutually combines.
Receiver is preferably with one or both method output signals.Simpler method is the signal amplitude of two satellite sources relatively, and selects stronger signal and be used for output.In addition, the phase place of two signals is adjusted until consistent with each other.Two signal plus produce an output signal then.This method has been avoided receiver is switched to another signal from a signal, and is not affected when the transmission path of two signals, or be subjected to partly just that multichannel decline or foliage decay influence the time signal than good quality can be provided.Above-mentioned phase place adjustment is necessary, although because two satellite sources send essentially identical signal substantially at the same time, is different with the distance of each satellite usually between platform, has different phase places so arrive the signal of mobile platform receiver.
In double frequency embodiment, the essentially identical broadcast singal of two satellite transmissions or transfer, but carry out with the cardinal principle different frequency.Owing to can obtain space diversity and frequency diversity simultaneously, this embodiment has only less multichannel decline.This embodiment also allows to use multichannel opposing modulation.But, receive comparatively complicated.As shown in Figure 7, this receiver comprises two down-converter, intermediate frequency amplifier and demodulator circuits.In Fig. 7, antenna each received RF signal from two satellites.Signal is amplified by radio frequency amplifier.The output of radio frequency amplifier is divided into two parts and delivers to each down-converter by dispenser.Change signal into intermediate frequency (IF) from radio frequency by down-converter.Local oscillator is made as suitable frequency and makes signal frequency F
1And F
2Convert identical IF to.IF from following line transformer delivers to demodulator.Demodulator removes signal modulation, and with the signal that detects or deliver to amplitude sensitive switch (strong (high level) signal of its output is used to listen to audio frequency amplifier and loud speaker) or deliver to phase corrector and adder (its change signal phase makes its identical and addition).Addition result exports audio frequency amplifier to and loud speaker is used to listen to.In addition, phasing also can be finished in demodulator.
Double frequency embodiment can also can be rapid conversion hysteria between two signal frequencies for by shown in Figure 7, maybe can utilize Digital Signal Processing.Output signal from receiver can be selected by the amplitude that compares two input signals, and utilizes stronger signal, and perhaps Shu Ru signal can tune to same phase place and produced an output signal mutually.
Claims (21)
1, a kind of method that is used to reduce the multichannel decline in radio broadcasting system is applicable to the signal with frequency in about 300MHz-3000MHz scope, comprising:
Utilize the broadening spectrum modulation to broadcast first signal from first satellite source that operates on the geostationary orbit;
Utilize the broadening spectrum modulation substantially side by side to broadcast secondary signal from second satellite source of described geostationary orbit, and having content and the frequency identical with first signal, described second satellite source apart predetermined number of degrees of first satellite source declines with the reduction multichannel and reduces the signal attenuation that causes because of the object in first signal and the secondary signal path;
A plurality of be arranged in earth surface or near fixed receiver and mobile receiver place produce an output signal from first signal and secondary signal.
2, the method according to claim 1 also comprises the intensity of measuring described first and second signals and select stronger signal from described first signal and secondary signal.
3, the method for claim 1 also comprises in conjunction with described first and second signals to form described output signal.
4, the process of claim 1 wherein that described first and second signals are modulated to be enough to resist the multichannel decline.
5, the method for claim 2, wherein said first and second signals are modulated to be enough to resist the multichannel decline.
6, the method for claim 3, wherein said first and second signals are modulated to be enough to resist the multichannel decline.
7, be used for reducing the method for the satellites transmits acc power of radio broadcasting system, described system is suitable for broadcasting the signal with the frequency in about 300-3000MHz scope, comprising:
Broadcast first signal from first satellite source that operates in geostationary orbit;
Substantially side by side broadcast the secondary signal that has with basic identical content of first signal and frequency from second satellite source that operates in described geostationary orbit, described second satellite source at a distance of predetermined number of degrees of first satellite source to reduce the required power of first and second signal to earth surface or near receiver emission;
Be arranged in earth surface or near a plurality of fixing receiver and a plurality of mobile receiver produce required signal from described first signal and secondary signal.
8, be used to reduce the method for satellites transmits acc power in radio broadcasting system, this system is suitable for the radio signal of broadcasting frequency in about 300MHz-3000MHz scope, comprising:
Broadcast first signal from first satellite source that operates in geostationary orbit;
Substantially side by side broadcast and the essentially identical secondary signal of first signal content from second satellite source that operates in described geostationary orbit, second satellite source is launched the required power of first and second signal at a distance of predetermined number of degrees of first satellite source earthward to reduce, and described secondary signal has the frequency different with first signal;
At the earth's surface or near many fixed receivers and mobile receiver place, from first and second signal, produce output signal.
9, in radio system, be used to improve the method that signal receives, comprise:
From operating in first signal of the first satellite source broadcasting frequency in about 300-3000MHz scope on the geostationary orbit;
From second satellite source broadcasting and the basic identical or different secondary signal of the first signal content same frequency that operates in described geostationary orbit, described second satellite source at a distance of predetermined number of degrees of first satellite source with improvement at the earth's surface or near a plurality of fixed receivers and mobile receiver to the reception of first and second signal;
From described first and second signal, produce output signal at described a plurality of fixed receivers and mobile receiver place.
10, in being suitable for the radio broadcasting system of broadcasting frequency in about 300-3000MHz scope, be used to reduce the method for foliage decay, comprise:
From operating in first signal of the first satellite source broadcasting frequency in described scope of geostationary orbit;
Substantially side by side broadcast secondary signal identical with first signal content and that frequency is basic identical or different from motion at second satellite source of described geostationary orbit, described second satellite source is decayed to reduce foliage at a distance of predetermined number of degrees with respect of first satellite source;
At the earth's surface or near a plurality of fixed receivers or mobile receiver place, from first and second signal, produce an output signal.
11, be suitable for the UHF radio system of broadcasting frequency signal in the 300MHz-3000MHz scope, comprise:
Broadcast the device of first signal from first satellite source that operates in geostationary orbit;
From the device of second satellite source broadcasting secondary signal that operates in described geostationary orbit, described second satellite source at a distance of predetermined number of degrees with respect of first satellite source to reduce the signal attenuation that multichannel declines and waters and cause because of the object in first signal and the secondary signal path;
At the earth's surface or neighbouring a plurality of receivers and mobile receiver, be used to receive first and second signal, and from first and second signal, produce the sound that to hear.
12, the system of claim 11 also is included in being used in the described receiver to measure device from the intensity of the signal of first and second satellite source, and selects the device of strong signal from first and second signal.
13, the system of claim 11, wherein said receiver comprises the device that is used in conjunction with described first and second signal.
14, claim 11 and 12 or 13 system also comprise being used to modulate described first and second signal to reduce the device of multichannel decline.
15, claim 11 or 12 or 13 system, wherein said second satellite source produces the secondary signal with the first signal different frequency.
16, claim 11 or 12 or 13 system also comprise a UHF receiver, comprising the device of measuring described first and second signal strength signal intensity, and the device that forms and export an output signal from described first and second signal.
17, claim 11 or 12 or 13 system, wherein said first satellite source comprises the satellite of at least two separation.
18, claim 11 or 12 or 13 or 14 system, wherein said second satellite source comprises the satellite of at least two separation.
19, claim 7 or 9 or 10 method comprise that also wherein the frequency of first signal is basic identical with secondary signal with described first and second signal of polarization mode broadcasting.
20, claim 11 or 12 or 13 method, broadcaster wherein is with described first and second signal of relative polarization broadcasting, and wherein the frequency of first signal is basic identical with secondary signal.
21, any method among the claim 1-20, wherein said predetermined number of degrees with respect is in the scope of 25-50 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93107630A CN1049314C (en) | 1993-06-25 | 1993-06-25 | Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93107630A CN1049314C (en) | 1993-06-25 | 1993-06-25 | Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1096910A true CN1096910A (en) | 1994-12-28 |
| CN1049314C CN1049314C (en) | 2000-02-09 |
Family
ID=4986782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93107630A Expired - Lifetime CN1049314C (en) | 1993-06-25 | 1993-06-25 | Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1049314C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506229A (en) * | 2014-12-19 | 2015-04-08 | 南京邮电大学 | Satellite network fault diagnosis method based on clustering |
| CN105659510A (en) * | 2013-07-25 | 2016-06-08 | 意大利广播电视股份公司 | System, decoder, and method for transmitting satellite signals |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US732905A (en) * | 1903-04-10 | 1903-07-07 | Harry Blackburn Alden | Envelop-sealing machine. |
| USRE32905F1 (en) * | 1980-10-20 | 1992-11-10 | Satellite communications system and apparatus |
-
1993
- 1993-06-25 CN CN93107630A patent/CN1049314C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105659510A (en) * | 2013-07-25 | 2016-06-08 | 意大利广播电视股份公司 | System, decoder, and method for transmitting satellite signals |
| CN105659510B (en) * | 2013-07-25 | 2019-06-18 | 意大利广播电视股份公司 | It is used for transmission system, decoder and the method for satellite-signal |
| CN104506229A (en) * | 2014-12-19 | 2015-04-08 | 南京邮电大学 | Satellite network fault diagnosis method based on clustering |
| CN104506229B (en) * | 2014-12-19 | 2017-08-01 | 南京邮电大学 | A Fault Diagnosis Method for Satellite Networks Based on Clustering |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1049314C (en) | 2000-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5319673A (en) | Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites | |
| US6983123B2 (en) | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals | |
| US5485485A (en) | Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites and hemispherical coverage antennas | |
| US6600730B1 (en) | System for distribution of satellite signals from separate multiple satellites on a single cable line | |
| EP1044523B1 (en) | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals | |
| CN1096910A (en) | Adopt the radio frequency broadcasting systems and the method for two low-cost geosynchronous satellites | |
| US6892050B1 (en) | Apparatus and method for transmitting terrestrial signals on a common frequency with satellite transmissions | |
| KR970007605B1 (en) | Radio frequency broadcasting systems | |
| AU767516B2 (en) | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals | |
| KR100412972B1 (en) | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals | |
| Maddocks et al. | Experimental work to assist in planning a DAB single-frequency network | |
| JPH08288866A (en) | Signal transmission system | |
| AU2003254739A1 (en) | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals | |
| MXPA99003334A (en) | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals | |
| AU1948500A (en) | Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SIRIRATH RIES SATELLITE RADIO COMPANY Free format text: FORMER NAME OR ADDRESS: CD RADIO INC. |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: CD Radio Inc. Patentee before: CD Radio Inc. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130625 Granted publication date: 20000209 |