CN1049314C - Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites - Google Patents
Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites Download PDFInfo
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- CN1049314C CN1049314C CN93107630A CN93107630A CN1049314C CN 1049314 C CN1049314 C CN 1049314C CN 93107630 A CN93107630 A CN 93107630A CN 93107630 A CN93107630 A CN 93107630A CN 1049314 C CN1049314 C CN 1049314C
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Abstract
The present invention has the technical scheme that the same signal is basically and simultaneously transmitted by two geosynchronous satellites positioned in the same orbit and has the advantages that multiplex fading and cluster leaf attenuation are basically eliminated, high-quality audio broadcasts are supplied to the earth surface or nearby mobile receivers by radio frequency, and low-cost space sections can be used.
Description
The present invention relates to the radio frequency broadcasting systems and the method for two low-cost geosynchronous satellites of a kind of employing.
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 earth surface at about 42300 kilometers nearly equatorial orbit, is inactive state with respect to ground observer.Satellite can be observed the about 1/3rd of earth surface under it, so radio broadcasting also can cover so big zone, perhaps utilizes the directive antenna on the satellite only to cover a zonule as a country.Because common ground AM/FM radio broadcasting station only covers very little zone, then is the principal character of radio broadcast via satellite so this potential providing runs through tens million of square kilometres overlay area of the radio broadcast service of ConUS (or other country /region).
No matter radio broadcast via satellite is moving, and still the fixed location receives and all will use special receiver, and this is owing to 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.U.S. Patent No. 4.291.409,4.291.410,4.532.635 etc. disclose several radio broadcast via satellite system respectively.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 1 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 the decay of multipath fading and foliage.Multipath fading 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 1 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 multipath fading 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 multipath fading at any time;
Between transmitter and receiver for desired signal provides second transmission frequency, be called frequency diversity, and when one of two frequencies are influenced strongly by multipath fading at any time, use;
3. the signal modulation that the opposing multipath fading is provided is as spread-spectrum.This method be when being formed certain opposing by bigger modulating frequency bandwidth, and receiver works when refusing certain opposing that undesirable extended code forms.
For the radio broadcast via satellite system that works in the UHF frequency, measure and estimation big scope by the expert about 9-12dB in order to overcome the required emission margin of multipath fading or foliage decay.The decay of multipath fading and foliage takes 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.
The present invention has overcome above problem, promptly almost side by side sends identical radio signals to reduce the influence of multipath fading and foliage decay, as shown in Figure 3 by two or three geostationary satellite sources (1,2) 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 multipath to disturb on identical frequency, or on different radio frequencies, the modulation that utilizes or do not utilize the opposing multipath 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.Even utilize two emission delivery vehicles, the cost of the satellite portion of system of the present invention also only reaches about 25% of single satellites transmits system.
The present invention proposes a kind of method that in radio broadcasting system, is used to reduce multipath fading, be applicable to signal, it is characterized in that with frequency in about 300MHz-3000MHz scope:
Utilize spread-spectrum modulation to broadcast first signal from first satellite source that operates on the geostationary orbit;
Utilize spread-spectrum modulation substantially side by side to broadcast from second satellite source of described geostationary orbit and have the content identical and the secondary signal of frequency with first signal, described second satellite source at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source to reduce multipath fading and to reduce 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.
The invention allows for a kind of method that is used for reducing 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, it is characterized in that:
First signal that comprises audio program information from first satellite source that operates in geostationary orbit in the broadcasting of first path;
Substantially side by side broadcast second broadcast singal that has with the first broadcast singal identical content and frequency in second path from second satellite source that operates in described geostationary orbit, described second satellite source and described second path at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source and first path to reduce the required power of first and second signal to earth surface or near receiver emission;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel the fixed receiver place and a plurality of to have a mobile receiver of channel that at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal synthetic and produce described broadcast singal as an output signal from described the first broadcast singal and described the second broadcast singal.
In addition, the invention allows for a kind of method that is used for reducing 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, it is characterized in that:
First broadcast singal that comprises audio program information from first satellite source that operates in geostationary orbit in the broadcasting of first path;
Substantially side by side broadcast second broadcast singal of identical content in second footpath from second satellite source that operates in described geostationary orbit, to reduce the required power of first and second signal to earth surface or near receiver emission, the frequency of described second broadcast singal is different from described first broadcast singal at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source and first path for described second satellite source and described second path;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel fixed receiver and a plurality of to have a mobile receiver of channel that at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal synthetic and produce described broadcast singal as an output signal from described the first broadcast singal and described the second broadcast singal.
Secondly, the invention allows for a kind of method that in radio system, is used to improve the signal reception, it is characterized in that:
From operating in first satellite source on the geostationary orbit at first broadcast singal that contains audio program information of the first path broadcasting frequency in about 300-3000Mhz scope;
From second satellite source that operates in described geostationary orbit at broadcasting of second path and the second identical or different broadcast singal of the first broadcast singal content same frequency, described second satellite source and described second path at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source and first path with improve at the earth's surface or near a plurality of fixed receivers and mobile receiver to the reception of first and second broadcast singal;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel the fixed receiver place and a plurality ofly have at least one channel that is used for receiving described the first broadcast singal and at least one to be used for receiving described first broadcast singal in mobile receiver place of channel of described the second broadcast singal and described the first broadcast singal synthetic and produce described broadcast singal as an output signal.
Again secondly, the present invention proposes a kind of method that in being suitable for the radio broadcasting system of broadcasting frequency in about 300-3000MHz scope, is used for reducing foliage decay and signal attenuation, it is characterized in that from the radio-frequency path obstacle:
In the 300-3000Mhz scope, comprise audio program information first broadcast singal in the first path broadcasting frequency from first satellite source that operates in geostationary orbit;
Substantially side by side broadcasting second broadcast singal identical with the first broadcast singal content and that frequency is basic identical or different in second path from second satellite source that operates in described geostationary orbit, decays and minimizing radio-frequency path obstacle to reduce foliage at a distance of the predetermined number of degrees with respect of a 25-50 degree of first satellite source and first path in described second satellite source and second path;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel the fixed receiver place and a plurality of to have a mobile receiver place of channel that at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal synthetic and produce described broadcast singal as an output signal from described the first broadcast singal and described the first broadcast singal.
At last, the present invention proposes a kind of UHF radio system that is suitable for the broadcast singal of broadcasting frequency in 300MHz arrives the 3000MHz scope, it is characterized in that:
One first broadcast source is used for broadcasting first signal that comprises audio program information in first path from first satellite source that operates in geostationary orbit;
One second broadcast source, be used for substantially side by side broadcasting in second path and essentially identical second broadcast singal of the first broadcast singal content from second satellite source that operates in described geostationary orbit, second satellite source and described second path are at a distance of predetermined interruption and the decay of the number of degrees to reduce described first and second broadcast singals of a 25-50 degree in first satellite source and first path; And
A plurality of fixing receivers and a plurality of mobile receiver, be used to receive described first and second broadcast singals, each described receiver fixing and that move be positioned at or be in earth surface or near, each described receiver can produce the described broadcast singal as an output signal from described first and second broadcast singals, each described receiver comprises that channel that at least one receives described first broadcast singal and at least one receive the channel of described second broadcast singal.
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 multipath fading 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 multipath and is disturbed and prevent to cause disturbing certainly mutually of signal jump.Preferably use spread-spectrum modulation (for example, direct order or frequency agility) to realize code division multiple access (CDMA).
The receiver that uses in mobile platform such as vehicle is preferably standard, the direct sequence spread spectrum checkout gear of single channel.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, S1 is the radiofrequency signal from satellite 1 of frequency F1, and S2 is the radiofrequency signal from satellite 2 of frequency F1, and 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 the spread-spectrum demodulator, and another signal is left in the basket.The signal level of detection signal is delivered to audio frequency amplifier and loud speaker so that listen to then to signal level memory and threshold compataror.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) spread-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 spread-spectrum code acquisition cuicuit and a testing circuit, as shown in Figure 6.
In Fig. 6, antenna receives from each RF signal S 1 in two satellites, S2.This signal is amplified by radio frequency amplifier.Convert signal to intermediate frequency from radiofrequency signal by descending translator.Specific intermediate frequency is selected by the frequency of local oscillator, descending translator output is divided into two parts by dispenser, and deliver to each extension 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 spread-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 the spread-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 multipath fading 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, so this embodiment has only less multipath fading.This embodiment also allows to use multipath 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, S2 ' be frequency F2 from satellite 2 ' radiofrequency signal, 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 by dispenser and delivers to each down-converter, changes 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.
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.
Claims (24)
1. a method that is used to reduce multipath fading in radio broadcasting system is applicable to the signal with frequency in about 300MHz-3000MHz scope, it is characterized in that:
Utilize spread-spectrum modulation to broadcast first signal from first satellite source that operates on the geostationary orbit;
Utilize spread-spectrum modulation substantially side by side to broadcast from second satellite source of described geostationary orbit and have the content identical and the secondary signal of frequency with first signal, described second satellite source at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source to reduce multipath fading and to reduce 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. according to the method for claim 1, it is characterized in that also being included in the step that ground receiver is measured the intensity of described first and second signals and select stronger signal from described first signal and secondary signal.
3. the method for claim 1, it is characterized in that also being included in ground receiver in conjunction with described first and second signals to form the step of described output signal.
4. the method for claim 1, it is characterized in that described first and second signals are modulated onto is enough to resist multipath fading.
5. the method for claim 2, it is characterized in that described first and second signals are modulated onto is enough to resist multipath fading.
6. the method for claim 3, it is characterized in that described first and second signals are modulated onto is enough to resist multipath fading.
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, it is characterized in that:
First signal that comprises audio program information from first satellite source that operates in geostationary orbit in the broadcasting of first path;
Substantially side by side broadcast second broadcast singal that has with the first broadcast singal identical content and frequency in second path from second satellite source that operates in described geostationary orbit, described second satellite source and described second path at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source and first path to reduce the required power of first and second signal to earth surface or near receiver emission;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel the fixed receiver place and a plurality of to have a mobile receiver of channel that at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal synthetic and produce described broadcast singal as an output signal from described the first broadcast singal and described the second broadcast singal.
8. 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, it is characterized in that:
First broadcast singal that comprises audio program information from first satellite source that operates in geostationary orbit in the broadcasting of first path;
Substantially side by side broadcast second broadcast singal of identical content in second footpath from second satellite source that operates in described geostationary orbit, to reduce the required power of first and second signal to earth surface or near receiver emission, the frequency of described second broadcast singal is different from described first broadcast singal at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source and first path for described second satellite source and described second path;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel fixed receiver and a plurality of to have a mobile receiver of channel that at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal synthetic and produce described broadcast singal as an output signal from described the first broadcast singal and described the second broadcast singal.
9. in radio system, be used to improve the method that signal receives, it is characterized in that:
From operating in first satellite source on the geostationary orbit at first broadcast singal that contains audio program information of the first path broadcasting frequency in about 300-3000Mhz scope;
From second satellite source that operates in described geostationary orbit at broadcasting of second path and the second identical or different broadcast singal of the first broadcast singal content same frequency, described second satellite source and described second path at a distance of the predetermined number of degrees of a 25-50 degree of first satellite source and first path with improve at the earth's surface or near a plurality of fixed receivers and mobile receiver to the reception of first and second broadcast singal;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel the fixed receiver place and a plurality ofly have at least one channel that is used for receiving described the first broadcast singal and at least one to be used for receiving described first broadcast singal in mobile receiver place of channel of described the second broadcast singal and described the first broadcast singal synthetic and produce described broadcast singal as an output signal.
10. in being suitable for the radio broadcasting system of broadcasting frequency in about 300-3000MHz scope, be used for reducing the method for foliage decay and signal attenuation, it is characterized in that from the radio-frequency path obstacle:
In the 300-3000Mhz scope, comprise audio program information first broadcast singal in the first path broadcasting frequency from first satellite source that operates in geostationary orbit;
Substantially side by side broadcasting second broadcast singal identical with the first broadcast singal content and that frequency is basic identical or different in second path from second satellite source that operates in described geostationary orbit, decays and minimizing radio-frequency path obstacle to reduce foliage at a distance of the predetermined number of degrees with respect of a 25-50 degree of first satellite source and first path in described second satellite source and second path;
Be arranged in or near earth surface a plurality of have at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal channel the fixed receiver place and a plurality of to have a mobile receiver place of channel that at least one channel that is used for receiving described the first broadcast singal and at least one be used for receiving described the second broadcast singal synthetic and produce described broadcast singal as an output signal from described the first broadcast singal and described the first broadcast singal.
11. the method for claim 7 or 8 or 9 or 10 is characterized in that described synthesis step comprises that described first broadcast singal of selection and second broadcast singal are used for exporting from least one described receiver.
12. the method for claim 7 or 8 or 9 or 10 is characterized in that described synthesis step comprises in conjunction with described first broadcast singal and second broadcast singal to produce described output signal at least one described receiver.
13. the method for claim 7 or 8 or 9 or 10 is characterized in that described predetermined number of degrees with respect is enough to make all receivers to be in the visual line of sight of first satellite source and second satellite source.
14. the method for claim 7 or 8 or 9 or 10 is characterized in that also being included in the described broadcasting and utilizes spread-spectrum modulation.
15. a UHF radio system that is suitable for the broadcast singal of broadcasting frequency in 300MHz arrives the 3000MHz scope is characterized in that:
One first broadcast source is used for broadcasting first signal that comprises audio program information in first path from first satellite source that operates in geostationary orbit;
One second broadcast source, be used for substantially side by side broadcasting in second path and essentially identical second broadcast singal of the first broadcast singal content from second satellite source that operates in described geostationary orbit, second satellite source and described second path are at a distance of predetermined interruption and the decay of the number of degrees to reduce described first and second broadcast singals of a 25-50 degree in first satellite source and first path; And
A plurality of fixing receivers and a plurality of mobile receiver, be used to receive described first and second broadcast singals, each described receiver fixing and that move be positioned at or be in earth surface or near, each described receiver can produce the described broadcast singal as an output signal from described first and second broadcast singals, each described receiver comprises that channel that at least one receives described first broadcast singal and at least one receive the channel of described second broadcast singal.
16. the described system of claim 15, it comprises the device of the signal strength signal intensity that is used to measure described first and second signals to it is characterized in that also comprising a UHF wireless receiver, and the device that forms and export an output signal from described first and second signals.
17. the system of claim 15, its feature also are included in being used in the described receiver and measure device from the intensity of the signal of first and second satellite source, and select the device of strong signal from first and second signal.
18. the system of claim 15 is characterized in that described receiver comprises the device that is used in conjunction with described first and second signal.
19. the system of claim 15 is characterized in that described broadcast source adopts spread-spectrum modulation.
20. the system of claim 15 or 17 or 18, it is characterized in that also comprising a UHF wireless receiver, it comprises the device of the signal strength signal intensity that is used to measure described first and second signals, and forms from described first and second signals and the device of output broadcast singal.
21. the system of claim 15 or 17 or 18 is characterized in that described second satellite source can produce and the second different broadcast singal of the described first broadcast singal frequency.
22. the system of claim 15 or 17 or 18 is characterized in that described first satellite source and described second satellite source separate a distance, this distance is enough to make all described receivers all in the visual line of sight of described first and second satellite sources.
23. the system of claim 15 is characterized in that comprising being used to modulate described first and second broadcast singal to reduce the spread-spectrum device of multipath fading.
24. the system of claim 20 is characterized in that comprising being used to modulate described first and second broadcast singal to reduce the spread-spectrum device of multipath fading.
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| CN93107630A CN1049314C (en) | 1993-06-25 | 1993-06-25 | Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites |
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| CN93107630A CN1049314C (en) | 1993-06-25 | 1993-06-25 | Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites |
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| CN104506229B (en) * | 2014-12-19 | 2017-08-01 | 南京邮电大学 | A kind of satellite network failure diagnostic method based on sub-clustering |
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| US732905A (en) * | 1903-04-10 | 1903-07-07 | Harry Blackburn Alden | Envelop-sealing machine. |
| USRE32905E (en) * | 1980-10-20 | 1989-04-11 | Equatorial Communications Company | Satellite communications system and apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US732905A (en) * | 1903-04-10 | 1903-07-07 | Harry Blackburn Alden | Envelop-sealing machine. |
| USRE32905E (en) * | 1980-10-20 | 1989-04-11 | Equatorial Communications Company | Satellite communications system and apparatus |
| USRE32905F1 (en) * | 1980-10-20 | 1992-11-10 | Satellite communications system and apparatus |
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