CN1066161A - Satellite communication system - Google Patents
Satellite communication system Download PDFInfo
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- CN1066161A CN1066161A CN 91102542 CN91102542A CN1066161A CN 1066161 A CN1066161 A CN 1066161A CN 91102542 CN91102542 CN 91102542 CN 91102542 A CN91102542 A CN 91102542A CN 1066161 A CN1066161 A CN 1066161A
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Abstract
The present invention relates to satellite communication system.Ground station (70) receives the paging signal of the paging system in the earth scope, and uplink radio frequency sending set (76) sends to the satellite that moves on the Earth's orbit with the control signal of paging signal and satellite controller (74) via antenna (80).The uplink receiver (78) that is contained on the satellite receives paging and control signal via first antenna (72).Downgoing line transmitter (86) and antenna (88) coupling mutually, according to the control of control system (94), antenna beam can send to the earth with the paging signal by many positions on the predefined procedure directed towards ground.
Description
The present invention relates to have the satellite communication system that the large tracts of land signal covers.The present invention but is not ad hoc to relate to the satellite communication system that for example can use in the satellite paging system particularly.
The satellite paging system that is just using at present comprises an antenna that is contained in the constant bearing on the geosynchronous satellite.Usually in such system, antenna and beam pattern thereof are all fixed, so that the spot of signal beam or " footprint " only are covered with that part of the earth that satellite can see; Its area is about 1/3rd of earth surface.
The signal that antenna sent is quite uniform in the intensity of ground level in the zone that is covered; But signal strength signal intensity is very faint.This just produces a problem, even for the synchronous satellite of maximum power, because the ground level signal strength signal intensity is too faint, so that can not consider that indoor paging covers.For example, be 400 watts synchronous satellite for radiant power, adopt the POCSAG rules, with existing, the signal margin that the paging receiver has only 2dB of calling that selective power is arranged of the bit rate work of per second 512 bits; In other words, on the ground, average signal strength is 2dB on the minimum levels that makes calling device work just.A kind of solution is exactly to use the signal of 60 bauds or littler low bit speed rate, to reduce the bandwidth of paging receiver.Yet this is quite expensive and impracticable because its user that can serve is less with regard to causing paging system.That is to say that low bit speed rate only can be supported the paging business of low capacity.
Therefore, the object of the present invention is to provide a kind of that improved, overcome above shortcoming or alleviated the satellite communication system of above deficiency at least.
According to the present invention, the satellite system signals that is provided comprises: a ground station is used to receive the paging signal from ground paging terminal; Uplink transmitter and antenna are used for that paging signal and control signal are sent to satellite and get on; Satellite around Earth's orbit; Be used to receive paging signal and control signal and be installed in line road receiver on the satellite; With the antenna of the steerable beam downgoing line radio frequency sending set of coupling mutually, satellite is equipped with the system of control downgoing line antenna beam azimuth, and when the paging signal is sent to terrestrial time, antenna beam points to tellurian many places by predefined procedure.
It is also understood that because antenna is provided with to such an extent that can move by predefined procedure, so signal beam just can sequentially point to specific geographic area, thereby makes antenna to scan very big scope, this just provides continent or global covering.
In others of the present invention, paging receiver in this system contains battery save device circuit, this circuit can make the motion of receiver on-off conversion operations and downgoing line wave beam realize synchronously, like this, receiver has only when the region of wave beam forward pager sends signal " leading to " or is in complete running status.
Now, satellite communication system of the present invention is described by embodiment and referring to accompanying drawing.
Fig. 1 is the sketch of prior art satellite paging system.
Fig. 2 is the sketch according to satellite paging system of the present invention.
Fig. 3 is the former existing sketch of explanation satellite paging system of the present invention work.
Fig. 4 is the flow chart of the explanation satellite beams course of work.
Fig. 5 A-5C is the sketch of explanation by each basic group signal of satellite paging system transmission of the present invention.
Fig. 6 is the block diagram that is suitable for the typical paging receiver that uses together with satellite paging system of the present invention.
Fig. 7 A-7B is the timing diagram of battery save device circuit working process in the explanation paging receiver shown in Figure 6.
Fig. 8 A-8B is the flow chart of the pager course of work in the key diagram 6.
At first referring to Fig. 1, the satellite paging system of prior art comprises a fixed antenna 4 that is contained on the satellite 6 of the earth 8 geo-stationary orbits operation again, and the work of this antenna 4 is subjected to satellite 6 controls.
The installation of antenna 4 will make its perimeter line with dashed lines 9 of signal beam 10(and 11 expressions that sent by this antenna 4) there are a wave beam zone, this zone to be covered with that part of the floor surface that satellite 4 sees.This wave beam is spotlight formula wave beam normally.As mentioned above because the signal strength signal intensity that goes up at the earth's surface is very faint, remove data rate is reduced to about 60 bauds or lower, this satellite paging system can not provide indoor calling covering.
From the paging signal of ground based terminal 31, be sent to reception antenna 30 on the satellite 6 through antenna 33.It is by 32 expressions of radio frequency (RF) uplink.
Come now referring to Fig. 2 again, in order to overcome the problems referred to above, comprise a movable or controlled antenna 22 according to the satellite paging system 20 of most preferred embodiment of the present invention, this antenna is contained on the satellite 24 of the geo-stationary orbit operation of the earth 26.The motion of movable antenna or action are subjected to satellite 24 controls.
According to this bright satellite paging system, can work in the following manner.
Referring to Fig. 3, will give uplink transmitter 76 from the paging signal of ground based terminal 70 with from the control signal of ground station's satellite controller 74.Uplink signal by paging data-signal and the desired signal of control satellite work (this satellite is controlled movable antenna 88 actions again) are formed sends to uplink receiver 78 by uplink transmitter 76 through transmitting antenna 80 and reception antenna 72.Be understood that the uplink data can adopt the data rate far above the downgoing line transmission to send.
Give satellite control system 81 and satellite paging controller 82 with the output of uplink receiver 78.Paging signal generator 84 receives information and the control signal from satellite paging controller 82, and the paging signal of pattern noted earlier is sent to the block diagram of the machine that has paging receiver 92 through downgoing line transmitter 86 and movable antenna 88.
Fig. 7 A-7B is the timing diagram of battery save device circuit working process in the explanation paging receiver shown in Figure 6.
Fig. 8 A-8B is the flow chart of the pager course of work in the key diagram 6.
At first referring to Fig. 1, the satellite paging system of prior art comprises a fixed antenna 4 that is contained on the satellite 6 of the earth 8 geo-stationary orbits operation again, and the work of this antenna 4 is subjected to satellite 6 controls.
The installation of antenna 4 will make its perimeter line with dashed lines 9 of signal beam 10(and 11 expressions that sent by this antenna 4) there are a wave beam zone, this zone to be covered with that part of the floor surface that satellite 4 sees.This wave beam is spotlight formula wave beam normally.As mentioned above because the signal strength signal intensity that goes up at the earth's surface is very faint, remove data rate is reduced to about 60 bauds or lower, this satellite paging system can not provide indoor calling covering.
From the paging signal of ground based terminal 31, be sent to reception antenna 30 on the satellite 6 through antenna 33.It is by 32 expressions of radio frequency (RF) uplink.
Come now referring to Fig. 2 again, in order to overcome the problems referred to above, comprise a movable or controlled antenna 22 according to the satellite paging system 20 of most preferred embodiment of the present invention, this antenna is contained on the satellite 24 of the geo-stationary orbit operation of the earth 26.The motion of movable antenna or action are subjected to satellite 24 controls.
According to this bright satellite paging system, can work in the following manner.
Referring to Fig. 3, will give uplink transmitter 76 from the paging signal of ground based terminal 70 with from the control signal of ground station's satellite controller 74.Uplink signal by paging data-signal and the desired signal of control satellite work (this satellite is controlled movable antenna 88 actions again) are formed sends to uplink receiver 78 by uplink transmitter 76 through transmitting antenna 80 and reception antenna 72.Be understood that the uplink data can adopt the data rate far above the downgoing line transmission to send.
Give satellite control system 81 and satellite paging controller 82 with the output of uplink receiver 78.Paging signal generator 84 receives information and the control signal from satellite paging controller 82, and the paging signal of pattern noted earlier is sent to the pager user 90 who has paging receiver 92 through downgoing line transmitter 86 and movable antenna 88.
Pager in the paging system utilizes as the synchronous code of the proper signal that illustrates below, suitable basic group simultaneous operation in the battery save device that makes pager and the satellite emission signal.In case pager is by synchronous and addressing, it will be to the paging signal interpretation.
Fig. 4 is the flow chart of explanation satellite beams controllable action.By weak beginningization back (102), select next beam. position (104) in system.Wave beam is moved to selected position (106) and satellite beams is started (112).Send the one section preset time of paging signal (116) that points to ad-hoc location then.After during this period of time, cut off satellite beams (118) and if the operation (120) that is not under an embargo of this system, select next beam. position (104).
Fig. 5 A represents to represent 40 by the typical case of the signal of satellite antenna 88 transmissions.This signal 40 is time division multiplexing binary system paging signals, and is made up of the sequence of basic group 42-50.Each basic group of basic group 42-50 is corresponding to the specific geographical position in the scanning area of satellite covering.For example, basic group 42 can be corresponding to New York, and 44 pairs of basic groups should be in Boston, and basic group 46 is corresponding to Chicago, or the like.Each basic group benchmark chronologically is sent to corresponding position.For instance, the POCSAG rules are used as the form of signal in each basic group.
Fig. 5 B illustrates each basic group (for example, 42), is made up of preceding pulse 62 and N the frame 64 that is connected on thereafter.
At last, Fig. 5 C has drawn, and the typical case of the frame in each frame 64 represents 61 among Fig. 5 B.Frame 61 is made up of synchronous code 63 and the unique regional identity code 65 that is connected on thereafter, and this identification code is corresponding to sent the geographical position that is covered by this basic group.Connect address signal 66 after the identification code 65 as the predetermined pager of visit.
The form of above-mentioned frame 61 can make the work of the battery save device in each pager owing to utilizing synchronous code 63 to be synchronized with the scanning sequency of movable antenna 24.In a single day the pager of working in specific geographical position only just is being powered after synchronously, if so that satellite 24 is when this geographical position sends signal, to the paging signal interpretation.This just provides paging battery life preferably.
In addition, the position of the pager of the present work of identification code 65 identifications of frame 61.Therefore, if pager is outside its normal operation region, identification code 65 provides positional information to pager, and this information can be presented on the display or can be used to start the different working modes of pager, for example, and " trip slowly " pattern.
Fig. 6 is a paging receiver block diagram used in satellite paging system of the present invention.It is habitually practise, selective power is arranged call the paging receiver, it comprises a radio-frequency transmitter 122, this radio-frequency transmitter is through antenna 120 received signals.The output of radio-frequency transmitter 122 is added on the microcomputer decoder 124, handles contained information in the received signal.As can be seen, microcomputer decoder 120 and output pad 126, code connector address and selection memory 128, and the user control on pager are kept in touch.The course of work of the paging receiver of pattern shown in Figure 6 is known, and being called in name in " the general paging device that has power reserves ", 1985,05,21 U.S. Patent No.s 4,518,961 of publishing has explanation.
In order in satellite paging system of the present invention, to finish its function, program for microprocessor decoder 124, with accompanying drawing 5A, the signal rules shown in 5B and the 5C are deciphered.Especially will be to decoder programming so as search from the signal of satellite and make its work decoding be synchronized to the timing of riding thereafter.In order to be synchronized to signal waveform, decoder at first works on till it translates the signal of downgoing line.It utilizes known simultaneous techniques then, makes its work decoding and the signal Synchronization that is received.Finish after these, receiver then utilizes and is included in the ROM program of microcomputer decoder or the information in code connector and the selection memory of being included in makes the work of battery save circuit of itself synchronous with the scheduled timing of satellite downlink road transmission.As a result, receiver battery save device only just starts pager at satellite in the time interval of pager location transmission signal.For example, draw the again preceding pulse 62 of in basic group 42 (Fig. 5 A) of Fig. 7 A, synchronous code 63 thereafter and the regional identification burst 65 after the synchronous code.Area identification burst 65 and No. 2 address 130 formation groups 1.Each subsequent group contains the 1st and the 2nd address, shown in Fig. 7 A.After the 8th group, repeat synchronous code 63.Therefore, if the program that receiver is worked out is according to group 4 each address, battery save device circuit in this receiver only during the search work 132 of searcher receiver preceding pulse 62 and synchronous code 63 in, startup pager in each synchronous code time interval 136 again during time interval 134 of transmission group 4 each address and thereafter.This is shown among Fig. 7 B.Certainly, in during the basic group 44,46,48 in other geographical position and 50, do not start pager.
Fig. 8 A and 8B are the flow charts of explanation operation of receiver process.After initialization, receiver be switched on (140) and during predetermined search (144) search bit synchronous code (142), after this, receiver is cut off (145).If realized bit synchronization before this predetermined searching period (146) is ended, receiver will begin its search to synchronous code (148).Have, the assumes synchronization sign indicating number was detected before predetermined searching period (152) is ended again, and position code is with decoded (154) and battery save timing circuit quilt synchronous (156).Receiver then will begin search address signal (158).If address signal is detected (160), will produce alarm signal (162).If location, location signal is not detected (160), receiver will continue the search address signal up to battery save device timing circuit till to indicate this be time of battery save (164).If do not detect the terminal (166) of basic group, timer will be placed in waits for next frame (168).If detect the terminal of basic group, timer will be placed to wait for next basic group (170) again.In both cases, receiver all will be switched on (174) behind reasonable time.
Can be learnt by above, utilize steerable antenna, the invention of the patent protection of asking can provide practical indoor paging to cover in sizable area.In addition, the scanning work of wave beam can be used to provide wide zone to cover, and when pager battery save device is synchronized to the motion of wave beam, also can prolong the pager battery life.
Can learn that further the paging in the nationwide or full continent that the invention of the patent protection of asking can be used to provide real covers.Also have in addition, it also can use with existing ground paging system, so that when the paging user leaves his common place, provides real nationwide covering.
Claims (9)
1, a kind of satellite communication system is characterized in that comprising:
The satellite of earth orbital operation,
The antenna that is used to provide signal beam that is connected with described satellite, described signal beam have little beam area and comprise the data-signal with many signal basic groups, arrange described satellite to control the orientation of described antenna,
Be used for described signal beam being pointed to the device of many positions on the earth by predefined procedure, wherein, described signal basic group is pressed predefined procedure and is arranged, each basic group of described many signal basic groups corresponding to a position and contain identification code for be used for discerning a pairing position, described many positions and
Be arranged in described many positions the signal receiver that selective power is arranged of the lightweight in the position, be used to receive described data-signal, start signal receiver described lightweight, that selective power is arranged, so that receive a basic group in described many basic groups, this basic group is corresponding to a position described in described many positions.
2, satellite communication system according to claim 1 is characterized in that described minor beam area is not more than 800 sq mis.
3, satellite communication system according to claim 1 is characterized in that signal receiver described lightweight, that selective power is arranged also contains the device to described data-signal decoding, and described code translator is determined the position of receiver according to described data-signal.
4, satellite communication system according to claim 1 is characterized in that signal receiver described lightweight, that selective power is arranged also has following feature:
Be used to receive the receiver section of described data-signal, with when described satellite offers a position at signal receiver place lightweight, that selective power is arranged described in described many positions with described signal beam, as start described receiver section and when described satellite offers described signal beam all the other positions in described many positions rather than the described position in described many positions as the battery save device circuit of the described receiver section of cut-out.
5, satellite communication system according to claim 1 is characterized in that the device that is used for many positions on the described signal beam sensing earth comprises:
First receiver is used to receive paging information and control information;
First transmitter is connected to described first receiver of described antenna, is used for sending and the corresponding described data-signal of described paging information;
Control device is connected to described antenna and described first receiver, is used to control described antenna, makes it according to described control information, and described steerable beam is sequentially pointed in described a plurality of position each.
6, satellite communication system according to claim 3, it is characterized in that: each basic group in described many signal basic groups contains the identification code as each position in the described many positions of identification, and the described device of the described decoding data signals in ground contains the device that described identification code is deciphered.
7, satellite communication system according to claim 5, the described device that it is characterized in that being used to controlling described signal beam also contain and are useful on second transmitter that described paging information and control information is sent to described first receiver.
8, be used for receiving by satellite with signal sequence send to each regional information of many presumptive areas, selective power is arranged call radio-frequency transmitter, it is characterized in that comprising:
Be used to receive the receiver section of described signal, with a zone time that just information is being sent to radio-frequency transmitter place described in described many presumptive areas when described satellite in starting described receiver section, and when all the other zones in described satellite forward described 6 many presumptive areas rather than this zone transmission signal in described many presumptive areas, be used to cut off the described battery save device circuit that connects ripple machine part.
9, a kind of from the earth station system terminal to the method that is positioned at the satellite communication of many communication control processors of many positions on the earth, it is characterized in that comprising following steps:
(a) send by control information and the signal formed from the basic group communication information of earth station system terminal,
(b) receive described signal by first antenna on the satellite that is connected to earth orbital operation,
(c) will be connected to a position in the described many positions of second antenna alignment on the satellite, determine a described position in described many positions according to described control information,
(d) provide the signal beam that contains from the described second antenna footprint, determine described footprint according to described control information,
(e) start described many communication control processors by some receivers that are in a position described in described many positions,
(f) signal of communication that will contain described communication information basic group is given position described in described many positions from described antenna transmission,
(g) receive the described signal of communication that contains described communication information basic group by the more described receivers in described many communication control processors,
(h) cut off some receivers described in described many communication control processors, and
(i) for next position repeating step (a) in described many positions to (h).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102542 CN1066161A (en) | 1991-04-22 | 1991-04-22 | Satellite communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102542 CN1066161A (en) | 1991-04-22 | 1991-04-22 | Satellite communication system |
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| Publication Number | Publication Date |
|---|---|
| CN1066161A true CN1066161A (en) | 1992-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102542 Pending CN1066161A (en) | 1991-04-22 | 1991-04-22 | Satellite communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108031C (en) * | 1995-12-04 | 2003-05-07 | 摩托罗拉公司 | Method and apparatus for call establishment in satellite communication system |
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1991
- 1991-04-22 CN CN 91102542 patent/CN1066161A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108031C (en) * | 1995-12-04 | 2003-05-07 | 摩托罗拉公司 | Method and apparatus for call establishment in satellite communication system |
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