CN1190509A - High capacity communications satellite - Google Patents
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- CN1190509A CN1190509A CN95197914A CN95197914A CN1190509A CN 1190509 A CN1190509 A CN 1190509A CN 95197914 A CN95197914 A CN 95197914A CN 95197914 A CN95197914 A CN 95197914A CN 1190509 A CN1190509 A CN 1190509A
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Abstract
A high capacity communication satellite uses a large number of parallel beams and optical processing to effect a fully interactive, high bandwidth, high channel capacity fully switched communication system. The satellite reuses its assigned bandwidth in each of the multiple beams. The beam are formed by either RF or optical means. The specific users in each beam are then separated optically using spatial light modulation (SLM) array correlation techniques. A single large SLM, or multiple smaller SLMs in combination, may be used. The individual customers are then repositioned in the array by optical SLM mixing and recorrelation. The result is then remodulated by another SLM array used as a mixer, and then recombined to reform the appropriate outgoing beams. The entire system then becomes a fully switched, high bandwidth, high channel capacity communications network on a single satellite.
Description
Background of invention
TECHNICAL FIELD OF THE INVENTION
The present invention relates to communication satellite, particularly, relate to the system that on single satellite, realizes high bandwidth, high channel capacity, full exchange, full interactive communication net.System of the present invention is a kind of large-capacity communication satellite, i.e. HCCS.
Description of related art
Satellite used in communication many years.The general use of satellite comprises: distribute transmission, for example C and Ku band communication satellite have the direct broadcasting satellite of one or two wave beam.These geo-synchronous orbit satellites (that is, their orbital velocity and highly make it be still in the sky of an ad-hoc location of earth surface) are broadcasted a series of whiles " program " to a large amount of earth stations in one direction.These satellites are not point-to-point or mutual (two-way).But they have quite wide bandwidth (typically, 100-500MHz).
The other use of communication satellite is that so-called point-to-point inlet type uses, and wherein received beam points to the reception parabolic antenna (for example, international communication) of the transmission beam position of big transmission parabolic antenna (for example, in Europe) and correspondence in the U.S..This system also be the earth synchronously and (100-500MHz) in broadband, still have only a limited number of wave beam (for example, for such system, 8 wave beams will be big figures very).In addition, these systems only cover limited zone, only allow limited exchange, also only handle a spot of communication channel even have.
Some newer system design (Iridium HEOS, caller communication) comprises the low-orbit satellite of (66 to 840) in a large number, transmits message and form a full Internet between these satellites.This design is to be limited in very complicated, the expensive system of low bandwidth (≌ 10KHz or lower) and under the situation of low capacity (50-200 channel in whole system).
Typical case's satellite communication system is subjected to the restriction of low bandwidth (for example, 50-500MHz only handles 50-500 channel), and utilization can be included in the switching network of the normal video exchange in the satellite only can handle the 10-100 translated channel.Even national telephone system only uses the very low audio frequency of bandwidth (≈ 10KHz) to exchange 1,000,000 users simultaneously at present.Land-based telephone systems comprises 10000-20000 Switching Module, also will be above 100,000,000 dollars on cost.
People are desirable to provide the satellite system with large volumes of channels and high bandwidth, and full exchange, mutual system are provided simultaneously.Though spatial light modulator (SLM) technology based on light is known, and can be used for transmission through air, for example, the application number of submitting to the inventor's name is that the unexamined patent application of No.08/133879 proves exactly, but application and road unknown by the people that this is used to provide the SLM technology of high power capacity satellite communication have only the inventor to understand so far.
Brief summary of the invention
The purpose of this invention is to provide a kind of satellite communication that does not have above-mentioned shortcoming.
Specific purposes of the present invention provide the optical processing and the switching system of the novelty of a kind of system that makes up a large amount of multi-antenna beams and a kind of SLM of use technology.
By using massive parallel wave beam (100-4000) and in each wave beam, distinguishing user (100-1000 user/wave beam) and the individual consumer is transferred on the suitable beamformer output and output frequency based on the spatial light modulator (SLM) of optical processing, therefore exchange when the present invention also allows to make 1MHz (full video) signal simultaneously up to 1,000,000 forms a complete mutual video network.
Opposite with a present desired 66-840 satellite, the bandwidth that is realized by the present invention is 100 times of bandwidth of expensive Low Earth Orbit system, and can handle user in the 5-20 multiple amount in single satellite.Therefore, system cost of the present invention is quite low.SLM is relative not expensive monolithic integrated circuit with beam-forming device, can make the weight of satellite be reduced to half of present design of satellites.
The HCCS system utilizes 100-4000 wave beam (basic design is 1000) simultaneously.Because if wave beam is suitably encoded separately, might in each wave beam, reuse whole frequency spectrums, every wave beam might be handled 500 users (in the total bandwidth of 500MHz, 1MHz/ user).Can use simultaneously for about 100 general-purpose families.
Remaining problem is how to exchange 500000 channels of going out.As mentioned above, existing phone system requires the voice-grade channel of the very low bandwidth of 10000-20000 module exchange equal number, and the HCCS system must exchange the video channel of the very high bandwidth (1MHz) of equal number in quite little satellite.
In the progress of the SLM that uses the quantum well technology, produced the capacity of 1024 * 1024 cell arrays in the recent period, this capacity can be driven into almost 0 reflection (surpassing the 40db dynamic range) from total reflection with the speed of IGHz.Though the array of this scale can be realized the present invention fully, and can be used as a preferred embodiment, in fact aspect the quantity and cost of needs, only less SLM is available.Using the combination (such as, as required or necessary, uses 2,4,8 or 16 or more) of a large amount of less SLM that the performance that can compare with performance that SLM realizes greatly is provided be the present invention's problem under consideration.
In preferred embodiment, at first 500 channels of every wave beam are encoded with Frequency Distribution or wideband encoding according to switching technology of the present invention.1024 * 1024 SLM cell arrays (being made of single SLM or a plurality of less SLM) will be mixed into base band from each incoming frequency of institute's dividing frequency then, and they are detected logical with band in base band.Under another situation, in the situation of wideband encoding, the signal of decoding is multiplied by input signal and comprehensive so that isolate 500 channels of every wave beam.In case separated and detect, they modulated again by other one group of SLM so that or shift them to suitable wave beam, perhaps produce the suitable wide bandwidth of every beamformer output, to resend this information.Whole system adopts about 7 to 10 1024 * 1024 SLM cell arrays, the linear array (1024 * 1) of a small amount of detector array and the suitable optics of a spot of utilization.
The additional optical components that makes the part of each wave beam turn back to its same area can also be used to handle the local call of desired more high power capacity in addition.
In institute of the present invention limit of consideration, increase some special circuits in addition as required, in order to further some channel is divided into 100 voice-grade channels, perhaps some combining channels are used for the transmission of Hi-Vision TV (HDTV).
The accompanying drawing summary
Characteristics of the present invention and advantage will become apparent from detailed description with the accompanying drawing, and identical label is represented corresponding feature and wherein all the time in each accompanying drawing:
Fig. 1 is the general picture as one embodiment of the present of invention of single satellite communication system;
Fig. 2 A is the more detailed figure that is used to produce a series of technology of multi-beam antenna according to of the present invention to 2C;
Fig. 3 is the more details drawing that is used to carry out the structure of optical processing in the first embodiment of the present invention;
Fig. 4 A and 4B describe the mechanism that is used for again a part of bandwidth of each wave beam being sent back to same area;
Fig. 5 describes another embodiment that utilizes digital coding to replace frequency coding;
Fig. 6 exchanges the detailed description that realizes a kind of " arbitrarily " according to the second embodiment of the present invention in length and breadth.
Detailed description of preferred embodiment
Fig. 1 represents according to large capacity satellite communication system of the present invention, wherein expresses every wave beam and has M user's N wave beam 2 simultaneously.These M user will only be the sub-fraction total user of this wave beam.Yet, because on any one time, individual consumer's only about 1% uses intercommunication system, and these M whiles, the user may represent so much potential user of 100 * M or terminal, and each user has a miniature antenna, transceiver and gamma camera and television set.
For 500 total signals in typical case's realization, this M while user (M is from 100 to 4000 here, and the typical case is 500) may have each Signal Compression some low-level approaching break-even video compression to 1MHz frequency band (or digital equivalent value).These each have 500 signals of 1MHz bandwidth by frequency coding or digital coding, so that be distinguished from each other them.Signal is by a reception in N the parallel beam 3 (typical N=1000) of the generation of the multi-beam antenna receiving system on the synchronous satellite (not shown) separately.
On satellite, these 1000 wave beams 3 (each comprise 500 simultaneously users) are sent to the multi-beam that the 1 * N SLM of utilization by laser illumination form M optical channel 6 and are formed device 5 along N channel 4.Then, each optical channel 6 utilizes to be dispersed circle and leans on lens and expand on the one-dimensional space, with the N * M SLM array that is radiated at single channel decomposer 7.。The suitable sinusoidal signal that this N * MSLM array is pulled after it drives, so that desired single channel is downconverted to video.After suitable detection and filtering, each channel of each wave beam decoded effectively and on a pixel of N * M detector array its signal isolated, produce N * M optical channel 8.
Then, a kind of effective crossbar switch 9 is used to any single channel is exchanged to any desired outgoing position.In its simple embodiment, this will be by the signal encoding in its source being realized, guaranteeing on the ground, in case detected, then this signal will be sent to desired receiving position in desired row.This should require not change in the operation " intelligence " and in satellite of right and wrong on satellite portion.
In a kind of complicated a little realization, add " double jump " ability possibly, wherein (or in all wave beams) ground transceiver may receive a signal and reselect it and is routed to desired end point in the wave beam of selecting.When needs, allow to change route.
In a kind of more general embodiment, selected pixel will be by optional frequency (or sign indicating number) " modulation again ", and down conversion and detection are handled and will be repeated to carry out in another kind of scheme.Can be moved on any other pixel at the signal on any pixel, allow the coupling in length and breadth of completely random ground.
In case signal is decoded and detection, they just are used to modulate other N * M SLM, to produce N * M photo-signal channel 10.Then, these paths are provided for an independent channel modulator 11, and this modulator comprises other SLM, and that pulls thereafter that (backplane) include suitable sinusoidal or sign indicating number modulation resends the bandwidth of wave beam with " filling ".Then, be provided for beam combination device 13 by the signal that N * M optical channel 12 is exported, this combiner comprises 1 * N detector array and cylinder type optical lens, produces N optical channel 14.Then, multi-beam forms device 15 and is used to produce appropriate signals 16, and then sequentially produces N and resend wave beam 17, and this wave beam is coaxial with N received beam.These wave beams (typical case is 1000) comprise 500 channels, and each channel is finished the cross-linked of full video, communication in the time of 1,000,000 users.
By dividing K direct channels 18 again, form device 5 from multi-beam and produce an additional via.If each channel is that for example one is directly returned filter, carries out frequency coding, this easiest accomplishing by a simple filter 19 on each wave beam.Each channel through filtering is added to multi-beam formation device 15 along K direct channels 20, connects in order to allow a large amount of local videos in each local wave beam.
Fig. 2 A-2C represents to produce the independent distinct methods of " multi-antenna beam ".Fig. 2 A represents to be commonly referred to many feeds of standard curved surface reflector design of Gregorian feed multi-beam antenna.In this antenna, a series of effective RF feeders 21 are positioned on the focussing plane of curved surface reflector 22, so that produce a series of wave beams 23 that may cover a big zone (for example, the U.S.).Fig. 2 B represents a kind of radio frequency Luneburq lens, and this is a kind of technology of utilizing dielectric spheres 24, and this ball has the variable dielectric constant as the function of radius, makes any parallel-beam focus on the point in this ball distally.If M feeder is positioned on the suitable position 25, will produce M the wave beam 23 that covers desired zone.
Above-mentioned two technology are known for those skilled in the art, here do not need to further describe.But when using in satellite system, these technology will certainly encounter problems.The more efficiently design of capacity is illustrated in Fig. 2 c, the figure shows a kind of Luneburg optical lens scheme, wherein the radio frequency multi-element array 27 of M the suitable element number of input wave beam 26 quilts is taken a sample and is divided generation M wave beam with empty, and its each unit is connected on N * M SLM 29 in the mode of a pixel to array element.Before outputing to SLM29, the output of array 27 in low-converter 28 by radio frequency down-conversion to base band.Laser 30 utilizes variable dielectric constant ball 33 that beamformer output is focused on the suitable M detector so that M wave beam sampled through suitable cylindrical lens 31 and half-reflecting mirror 32 irradiation SLM 29.M feeder 34 (can be diode laser) put together produces independent beamformer output.Obviously, the embodiment of Fig. 2 C will be simply more than the embodiment of figure A or 2B.
Fig. 3 represents to form by the beamformer output shown in Fig. 1 from the output 6 (N optical channel) of as shown in Figure 1 input Beam-former 5 inter-process of the input 14 of device 15 (N optical channel).With reference to Fig. 3, dividing other signal path 100 (typical case is 1000 paths) to form from the signal of importing Beam-former 5 by N antenna beam signal, each path contains M frequency or digitally coded synchronous signal (typical M=500).These signal paths are connected to 1 * N SLM array 101.This array is shone by collimating lens 104 and half-reflecting mirror 103 by laser 105, and the output of laser 105 is focused linear array 101 by cylindrical lens 102 then.Lens 102 are also expanded the wave beam of the reflected signal of each combination, to cover a complete line of other SLM array 106.This array makes every row quilt hardwired together, and by the modulation of the same signal in separate channel analyzer 107.First row are by frequency f
1Modulation, secondary series is by frequency 2f
1Modulation, the 3rd row are by frequency 3f
1Modulation, or the like.To the last row are by frequency Mf
1Modulation.Therefore, contain from f
1To Mf
1The wave beam of all frequencies multiplied each other by the reflectivity of each pixel, the position during each pixel is expert at according to it is also by f
1To Mf
1Modulation (above-mentioned process be actually homophase (I) and quadrature (Q) step carry out with the covering two-dimensional direction) therefore, frequency is " transfer " effectively, makes desired channel be transferred or downconvert to video.Then the array of signal by 103 reflect and collimated lens 108 focus on detector/accumulator array 109.This process is detection signal and for the required signal of each pixel low-pass filtering effectively.
Detector/accumulator array 109 is connected on the pixel by the pixel based on other SLM array 110, and array 110 is shone by collimating lens 112 and half-reflecting mirror 111 by laser 113.Here, each single channel has been detected and its signal is arranged on of N * M pixel of SLM array 110 fully.This image SLM array 114 that is reflected out then, each independent signal of this array " modulation again " is to fill the independent wave beam of output.Here, the N of an input wave beam still is expanded between going separately, and wherein wave beam 1 is a row 1, and wave beam 2 is row 2, or the like.Each row is represented the individual consumer in this wave beam now, row 1 representative of consumer 1, and row 2 representative of consumer 2, or the like.In this embodiment be identical with SLM array 106 but the other channel modulator 115 of half-twist list extracts these demodulation arrays and modulates signal corresponding to user 1 again, wave beam 1 arrives frequency f
1, the user 1, wave beam 2 to frequency 2f, or the like.Identical with SLM array 106, this process is carried out on homophase (I) and quadrature (Q) step.Then, after signal was reflected out half-reflecting mirror 111, they were compressed on the single pixel that becomes beamformer output 1 by cylindrical lens 116.Each wave beam will be compressed by this way, and each wave beam will output to N antenna feed sending end 118 through 1 * N detector array 117.This is possible, because modulation has realized utilizing the modulation of different frequency to each " user 1 " again, allows respectively to receive the user and distinguishes their calling separately.
Therefore, modulated again from each user J of all N wave beam, so as on frequency with separated and combination optical signal, produce new wave beam J.
For 1000 whiles of every wave beam user and 1000 wave beams, this embodiment that has just described will allow the individual consumer of a customer call in other each wave beam of each wave beam.Though the capacity of this system looks like sizable (1,000,000 while video circuits), it can not be complementary with the typical utilance of communicating by letter well.This is because in general, and a large amount of callings is local and non-indigenous, and all attempts to concentrate on high density area (for example, New York, Washington D.C.).
A kind of technology of calling out congestion problem that relaxes will be to place some repeaters in a large amount of utilance sensitive areas.These repeaters may use wave beam K as the relaying between originating point and desired destination.Though this mode may exhaust some capacity in the K zone that the K wave beam served, it also may provide tangible system flexibility.
Fig. 4 A and 4B describe and pass through frequency f
1To f
KSpecial-purpose do " local call ", with two kinds of mechanism of the quantity available that increases local call (that is, in the wave beam).This be can wave beam to the basis of wave beam by direct filtering--a kind of technology of describing with reference to Fig. 4 A,--perhaps at all f
1To f
KSignal is after by space filtering, by to they filtering--a kind of technology of describing with reference to Fig. 4 B, realization.Fig. 4 A describes the solution of a kind of electronics (traffic filter bypass), and Fig. 4 B has described a kind of optics solution, and this way comprises a variable N of light * M array 115 realization part bandwidth bypasses.In Fig. 4 A, input signal 200 is divided into two signals by splitter 201.A signal continues to enter 1 * N SLM array 101, so that according to former described processing.Another channel is filtered and directly make up with output signal from 1 * N detector array 117 in band pass filter 202.These signals carry out phase in adder 203 provided a sum signal, and this signal is used to drive the beamformer output 204 corresponding to identical input wave beam.
Fig. 4 B describes the optics solution for same problem.Signal by half-reflecting mirror 111 input is by the blocking-up of completely reflecting mirror 205 parts of 45 ° of orientations, and this signal reflex goes out perpendicular mirrors 206 and other 45 ° of mirrors 207 with the regional b that is mapped among the regional a.It should be noted that regional b has rotated 90 ° with respect to regional a.After suitable demodulation, the wave beam of output contains and the frequency f that transmits in same beam
1To f
KIdentical frequency f
1To f
K
A kind of replaceable embodiment that Fig. 5 represents to utilize digital code multiplication replacement down-conversion SLM 106 and modulates SLM 105 again.Used in this drawing buzz word represents that different sign indicating numbers can use in two-way communication.As shown in the figure, frequency f
1K+1 replaces by sign indicating number, frequency f
2Quilt sign indicating number K+2 replaces and the rest may be inferred is used for the down conversion processing, and frequency f
1Replaced frequency f by sign indicating number 3
2Quilt sign indicating number 2 replaces and the rest may be inferred is used for modulation treatment again.Fan She signal is carried out comprehensive with the desired signal of decoding then.This technology will allow much more very channels be comprised in one give in the bandwidth, the same with common code division multiple access (CDMA) system.
Simple embodiment, even utilize repeater in the wave beam and the bypass of part bandwidth increasing available local call, and this will be difficult under the situation of handling a large amount of callings between two discrete beams.Utilize the repeater technology, to each additional calls additional channel of using up.Therefore, for example, 10 callings between wave beam 10 (Lip river China fir base) and the wave beam 342 (Washington) may be adopted 19 channels of sum.The embodiment that exchanges in length and breadth arbitrarily fully shown in Figure 6 will handle such problem at an easy rate.
The realization that exchanges in length and breadth arbitrarily of Fig. 6 comprises all structures of Fig. 3, but has increased some optical elements between N * M SLM array 110 and detector/accumulator 109 that adds and SLM array 110.First detector/accumulator 109 and SLM array 110 are by each input user of row identification with by each wave beam of row identification.The output light signal of SLM 110 turns by half-reflecting mirror 301 and passes half-reflecting mirror 300, and is focused on any modulator SLM of the N * M array 303 (modulator # 1 arbitrarily) by lens 302.This array 303 is complicated N * M arrays, allows any frequency f
1-Mf
1Any pixel in modulation N * M array.Utilize any modulator # 1, each pixel can be different any Kf to each pixel
1Multiply each other.
Then, any modulated signals that reflects from array 303 is focused on the line and by second cylindrical lens 304 by first cylindrical lens 304 and expands by half-reflecting mirror 305 to the f of each pixel of down conversion to it
1-Mf
1Another SLM array 306.Image by array 306 outputs is arrived any modulator SLM of the 2nd N * M array 308 (modulator # 2 arbitrarily) by half-reflecting mirror 305 reflections by half-reflecting mirror 307 then, and this modulator utilization is different arbitrary value Lf to each pixel
1Multiply by each pixel.The output of SLM array 308 is reflected by half-reflecting mirror 307 and is transmitted by first and second cylindrical lenss 309,309, is similar to the processing of SLM array 303 outputs.Therefore each pixel is down converted to its f on SLM array 311
1-f
NThe position.
The one SLM array 306 moves the signal at plane # 1 effectively, and the 2nd SLM array 311 moves the signal at plane # 2 effectively, plane # 2 and plane # 1 quadrature.This signal is detected (for example, being undertaken by detector/accumulator 109) again and is used to modulate other SLM array (for example the SLM array 110) and makes up with initial spike from SLM array 110 then.Therefore, can be moved as any other signal, thereby produce greater flexibility from any other wave beam from any signal of any wave beam.
Though invention has been described with reference to preferred embodiment,, within scope and spirit of the present invention, make various changes and modification is conspicuous for the professional and technical personnel.Thereby we think that the present invention is only limited by the scope of accompanying Claim book.
Claims (31)
1. intercommunication system that only utilizes a satellite, described system comprises:
Be used to receive the receiving system of first group of N wave beam, each wave beam of described first group of N wave beam is served M user simultaneously, and wherein N and M are integers;
Be used for forming the optical channel formation device of first group of N optical channel from corresponding each wave beam of a described N wave beam;
Be used on the one dimension direction, expanding each described first group channel N optical channel to shine the expanding unit of the one N * M array;
Be used for to be present in any locational switch of locational handshaking to the two a N * M array of the one N * M array;
Be used for described the 2nd N * M array is constituted the expanding unit that goes of second group of N optical channel;
Be used for to be transformed to the beam-forming device of second group of N wave beam from second group of N the optical channel that removes expanding unit; With
Be used to send the dispensing device from second group of N wave beam of described beam-forming device, each wave beam of described second group of N wave beam is served M user simultaneously.
2. according to the system of claim 1, wherein said optical channel forms device and comprises one 1 * N spatial light modulator.
3. according to the system of claim 1, wherein said expanding unit comprises disperses cylindrical lens.
4. according to the system of claim 1, wherein said switch comprises:
Be used for being received in the channel decomposing device of N * M channel from the output of described expanding unit;
Be used to receive from the output of channel decomposing device and decode and isolate the switch in length and breadth of N * M channel; With
Be used to receive output and recompile N * M channel, so that utilize the described Channel Modulation device that goes expanding unit and described beam-forming device to carry out subsequent compression and conversion from described switch in length and breadth.
5. according to the system of claim 4, wherein said channel decomposing device comprises:
The one N * M spatial light modulator array is used to receive the output from described expanding unit;
The first laser beam source apparatus is used to utilize first laser beam to shine described the one N * M spatial light modulator array; With
First half-reflecting mirror by described first laser beam irradiation.
6. according to the system of claim 4, wherein said switch in length and breadth comprises:
N * M detector/accumulator is used to receive the output of described channel decomposing device and N * M output is provided on segregate each channel; With
The 2nd N * M spatial light modulator array has and is used for receiving any N of described N * M detector/accumulator * M output and via any other N * their N * M unit of output, M unit via any N * M unit.
7. according to the system of claim 4, wherein said Channel Modulation device comprises:
The 3rd N * M spatial light modulator array is used to receive the output from described switch in length and breadth;
The second laser beam source apparatus is used to utilize second laser beam to shine described the 3rd N * M spatial light modulator array; With
By second half-reflecting mirror of described second laser beam irradiation.
8. according to the system of claim 1, the wherein said expanding unit that goes comprises the convergence cylindrical lens.
9. according to the system of claim 1, wherein said beam-forming device comprises 21 * N spatial light modulator.
10. according to the system of claim 1, also comprise at least one ground transmitter, described at least one ground transmitter comprises and is used for the device of frequency coding by described M user's of each beams serves of a described N wave beam signal, so that by the described signal of distinguishing a concrete user who is subordinated to a described M user in other described signal of other user who is subordinated to a described M user, wherein said expanding unit provides N * M frequency coded signal from along described each signal of expansion described M the user who divides other light path separately.
11. according to the system of claim 10, wherein said switch in length and breadth comprises:
The one N * M spatial light modulator array is used for receiving the decode N * M frequency coded signal from described expanding unit according to the code frequency of separating that provides at described first spatial light modulator array, so that the signal of N * M decoding to be provided; With
The one N * M detector array is used to receive the signal of described N * M decoding and isolate described N * M decoded signal to N * M respective channel.
12. according to the system of claim 11, wherein said switch in length and breadth further comprises:
The 2nd N * M spatial light modulator array is used for being received in the described N * M decoded signal of described N * M respective channel and what its corresponding each channel of described N * M in office and sends described N * M decoded signal; With
The coding frequency, frequency modulation(FM) and the described N * M decoded signal of encoding again that provide according at described the 3rd spatial light modulator array are provided the 3rd N * M spatial light modulator array.
13. system according to claim 1, also comprise at least one ground transmitter, described at least one ground transmitter comprises that the signal that is used for by each described M user who serves of described N wave beam carries out digitally coded device, so that distinguish a specific user's who is subordinated to a described M user described signal in other the described signal by other user who is subordinated to a described M user.
14. according to the system of claim 13, wherein said switch in length and breadth comprises:
The one N * M spatial light modulator array is used to receive the decode the N * M digitally encoded signal from described expanding unit, with according to the decoded information that provides in described first spatial light modulator array, provides the signal of N * M decoding; With
The one N * M detector array is used for receiving described N * M decoded signal and described N * M decoded signal is partitioned into N * M respective channel.
15. according to the system of claim 14, wherein said switch in length and breadth comprises:
The 2nd N * M spatial light modulator array is used for being received in the described N * M decoded signal of described N * M respective channel and what its described N * M respective channel in office and sends described N * M decoded signal; With
The digital code information, modulation and the described N * M decoded signal of encoding again that provide according at described the 3rd spatial light modulator array are provided the 3rd N * M spatial light modulator array.
16. according to the system of claim 1, wherein N approximately is 1000.
17. according to the system of claim 1, wherein M approximately is 500.
18. according to the system of claim 10, wherein said switch comprises:
The decoded information that provides according at described first spatial light modulator array is provided the one N * M spatial light modulator array, receive the decode from described expanding unit N * M signal, so that N * M decoded signal to be provided;
The one N * M detector array is used to receive described N * M decoded signal and the described decoded signal of N * M is partitioned into first group of N * M respective channel;
The 2nd N * M spatial light modulator array is used for being received in the described N * M decoded signal of described N * M respective channel and sends described N * M decoded signal in any other channel of described first group of N * M respective channel;
The 3rd N * M spatial light modulator array is used for modulating described N * M decoded signal according to the independent pixel of N * M;
The 4th N * M spatial light modulator array is used for the independent pixel along the described N * M of first planar transfer;
The 5th N * M spatial light modulator array is with modulating the independent pixel of described N * M again, with the independent pixel that provides N * M to modulate again;
The 6th N * M spatial light modulator array is used for the independent pixel modulated again along the described N * M of second planar transfer that is orthogonal to described first plane, provides N * M through shifting each pixel of revising;
The 2nd N * M detector array, the described N * M that is used for receiving from described the 6th N * M spatial light modulator array organizes corresponding each channel detection of N * M and isolates described N * M through shifting each pixel of modification through each pixel of transfer modification with at said another;
The 7th N * M spatial light modulator array, corresponding each channel of N * M that is used to receive described another group corresponding each channel of N * M and sends any other described another group along corresponding each channel of any other described another group N * M; With
The 8th N * M spatial light modulator array, be used for according in the coded message that described the 8th N * the M spatial light modulator array provides, modulation and recompile are by the decoded signal of described the 7th N * M spatial light modulator array reception in corresponding each channel of the N * M of described another group.
19. system according to claim 1, also comprise being used to the device of being reselected route by the signal that sends to first destination along a particular channel from first source according to the predictive encoding Scheme Choice, right via destination/source in the middle of at least one under the occupied situation of described particular channel.
20. according to the system of claim 5, wherein said the one N * M spatial light modulator array comprises a N * M spatial light modulator.
21. according to the system of claim 5, wherein said the one N * M spatial light modulator comprises a plurality of spatial light modulators.
22. according to the system of claim 6, wherein said the 2nd N * M spatial light modulator array comprises a N * M spatial light modulator.
23. according to the system of claim 6, wherein said the 2nd N * M spatial light modulator array comprises a plurality of spatial light modulators.
24. according to the system of claim 7, wherein said the 3rd N * M spatial light modulator array comprises a N * M spatial light modulator.
25. according to the system of claim 7, wherein said the 3rd N * M spatial light modulator array comprises a plurality of spatial light modulators.
26. the system of claim 12, each of wherein said first to the 3rd N * M spatial light modulator array comprise a single N * M spatial light modulator.
27. the system of claim 12, each of wherein said first to the 3rd N * M spatial light modulator array comprises a plurality of spatial light modulators.
28. the system of claim 15, each of wherein said first to the 3rd N * M spatial light modulator array comprise a single N * M spatial light modulator.
29. the system of claim 12, each of wherein said first to the 3rd N * M spatial light modulator array comprises a plurality of spatial light modulators.
30. the system of claim 18, wherein said first to the 8th N * M spatial light modulator array comprises a single N * M spatial light modulator.
31. the system of claim 18, wherein said first to the 8th N * M spatial light modulator array comprises a plurality of spatial light modulators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95197914A CN1087532C (en) | 1995-05-12 | 1995-05-12 | High capacity communications satellite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95197914A CN1087532C (en) | 1995-05-12 | 1995-05-12 | High capacity communications satellite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1190509A true CN1190509A (en) | 1998-08-12 |
| CN1087532C CN1087532C (en) | 2002-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95197914A Expired - Fee Related CN1087532C (en) | 1995-05-12 | 1995-05-12 | High capacity communications satellite |
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| Country | Link |
|---|---|
| CN (1) | CN1087532C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857299A (en) * | 2012-08-23 | 2013-01-02 | 中国科学院苏州纳米技术与纳米仿生研究所 | Optical communication system and method |
| CN111052503A (en) * | 2017-04-10 | 2020-04-21 | 维尔塞特公司 | Coverage area adjustment for accommodating satellite communications |
-
1995
- 1995-05-12 CN CN95197914A patent/CN1087532C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857299A (en) * | 2012-08-23 | 2013-01-02 | 中国科学院苏州纳米技术与纳米仿生研究所 | Optical communication system and method |
| CN111052503A (en) * | 2017-04-10 | 2020-04-21 | 维尔塞特公司 | Coverage area adjustment for accommodating satellite communications |
| CN111052503B (en) * | 2017-04-10 | 2021-06-29 | 维尔塞特公司 | Method and system for adapting coverage area adjustment for satellite communications |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1087532C (en) | 2002-07-10 |
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