CN1066544A - The satellite letter signal system that the signal beam cross section is variable - Google Patents
The satellite letter signal system that the signal beam cross section is variable Download PDFInfo
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- CN1066544A CN1066544A CN 91102902 CN91102902A CN1066544A CN 1066544 A CN1066544 A CN 1066544A CN 91102902 CN91102902 CN 91102902 CN 91102902 A CN91102902 A CN 91102902A CN 1066544 A CN1066544 A CN 1066544A
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Abstract
The present invention relates to a satellite letter signal system (20) such as satellite paging system, its signal covers a very wide zone, it is characterized in that: be equipped with on the satellite position that is used to provide this satellite control antenna of antenna of the variable signal beam (27) of beam cross-section make its by predefined procedure with the tellurian a plurality of positions of beam position, antenna is designed to by its wave beam position change signal beam cross section (28) pointed, and wave beam (27) comprises that its speed can be according to the data-signal of beam cross-section (28) change.
Description
The present invention relates to have the very satellite letter signal system of bandwidth signals overlay area, specifically and not exclusively say, the present invention relates to for example can be used for the satellite letter signal system of satellite paging system.
The present age, satellite paging system comprised a fixed directional antenna that is installed on the synchronous satellite.Usually, in this system, antenna is fixed, and the signal beam of antenna footprint or " footprint " on earth can cover by the zone of satellite " look and "; That is to say, can cover about 1/3rd earth surface.
In the system of these prior arts, the intensity that is arrived ground by the signal of antenna emission is quite uniform in whole covering domain, yet its intensity is very faint.Consequent problem is consequently can not carry out paging in the overlay area because of ground signal is too weak, this in addition also be like this to the synchronous satellite of high transmit power, it for example is 400 watts synchronous satellite for a radiant power, concerning adopting with the selective call paging receiver of the up-to-date technology level of the POCSAG paging protocol of the bit rate of per second 510 bits, its signal margin only is 2db, in other words, signal intensity ratio on the ground exceeds two decibels for driving the most flat required of minimum of paging equipment.So the radio frequency paging signal reaches 20dB because most of buildings will be decayed, these systems can not be used to be positioned at the signal calling user of building.
In order to one of method of this difficult problem of solving present system is by data rate being reduced to 60 bauds or reducing the bandwidth of paging receiver to get off, yet in such event, therefore can only provide the viewpoint of small number of users from paging system, make this paging system seem extremely expensive and the usefulness that do not sound feasible.That is to say that low rate can only provide the paging communication of low capacity.
With the present invention for same inventor and transfer describe in same assignee's the pending application and declared a kind of than the current techniques advanced person the satellite paging system of Duoing, it uses the antenna of little " footprint " or minor beam width and the intensity of ground signal is improved greatly, and the sensing of antenna beam controlled, make to cover different geographic regions with a corresponding radiation pattern and obtain wide overlay area with this.With the high strength ground signal level that obtains thus, and with the scanning motion of wave beam on ground, and the synchronous beep-pager battery saving technique of the opening and closing of paging receiver and beam scanning combines, the signaling data speed that then is 512 bauds or 1200 bauds all can be used, thus for realize very wide zone or global satellite for the paging system in base provides first can practical way.
Yet this method itself also has some limitations, at first, promptly enables to reach the signal rate of 512 bauds or 1200 bauds, its high not enough user to the very big quantity that the global paging service of final realization is provided.Secondly, system can only handle the difference that regional population occupies collection by the time length that changes a scanning beam given area pointed.At last, it can not utilize such advantage: the most collection that occupies of the population of developed country is in the highdensity city of population.
So, the purpose of this invention is to provide a kind of improved satellite letter signal system with big information throughput.
Another object of the present invention provides and a kind ofly can adapt to the different satellite letter signal system of the density of population.
Another purpose of the present invention provides a kind of satellite letter signal system that a higher rate signal rate can be provided selectively.
A further object of the present invention is the satellite letter signal system that economy is provided for the user of sufficient amount.
The invention provides a kind of satellite letter signal system, it comprises that a satellite and a coupled antenna are used to provide a signal beam that beam cross-section is variable.Satellite can be controlled the sensing of antenna, makes signal beam point to tellurian a plurality of position with predetermined order.Antenna can change the cross section of signal beam by signal beam position pointed.Signal beam comprises a data-signal, system changes data rate according to beam cross-section, for example, if signal beam be meant a densely populated position, then change antenna beam cross section and data rate to provide the data-signal of a little beam cross-section and a high data rate.If signal beam is meant in underpopulated position, then change antenna beam cross section and data rate to provide the data-signal of a big beam cross-section and a low data rate.
So, we are appreciated that, utilize the movably antenna of the signal beam of variable beam cross-section of emission and variable-data-rate, beam cross-section and data rate can be by each certain location in to change, so that on the ground signal strength signal intensity is enough to realize the paging in the building is covered during each position, and by changing data rate so that the throughput maximum of signal system.
Can recognize also simultaneously that can move by predetermined order because antenna is design, so signal beam can be aimed at the geographic area of appointment successively, its result makes antenna scan a very wide zone, thereby realizes intercontinental or global covering.
Satellite letter signal system of the present invention is described middle with reference to the accompanying drawings embodiment.
Fig. 1 is the schematic diagram of the satellite paging system of prior art;
Fig. 2 is the schematic diagram of satellite paging system of the present invention;
Fig. 3 is the block diagram that comprises system of the present invention;
Fig. 4 is the flow chart that describes the operation principle of Fig. 3 system in detail;
Fig. 5 A is the schematic diagram that a down link signal that is launched of the present invention is criticized row;
Fig. 5 B is the schematic diagram of a collection of signal of a composition diagram 5A series part;
Fig. 5 C is a schematic diagram of forming the signal frame that is shown in the some of criticizing among Fig. 5 B;
Fig. 6 is a block diagram that can be used for that class paging receiver of new satellite letter signal system;
Fig. 7 is the timing diagram that describes the battery saving circuit of the beep-pager among Fig. 6 in detail;
Fig. 8 A and 8B show the flow chart of work of decoder of the beep-pager of Fig. 6.
Consult Fig. 1 earlier.The satellite paging system 2 of prior art comprises a fixed antenna on the geosynchronous satellite that is installed in the earth 8.Work by satellite 6 control antennas 4.
Antenna 4 is to be shown in dotted line among its circumference of the signal beam 10(Fig. 1 that is designed to by its emission) wave beam cut and can cover earth surface that 4 on satellite can " look and " partly.。As mentioned above, unless the data rate of signal beam 10 is reduced to below 60 bauds, otherwise because of signal strength signal intensity at the earth's surface is very low, and make satellite paging system 2 can not provide the paging in the building to cover.
Consult Fig. 2 now.For addressing these problems, the preferential embodiment according to the present invention, satellite paging system 2 comprise driving or antenna 22 movably on the geosynchronous satellite 24 that is contained in the earth 26.The motion of removable antenna 22 and operation are then by satellite 24 controls.
For example, to a satellite paging system with 400 watts of Effective Radiated Powers (ERP), diameter of section is that 800 miles wave beam can provide the ground signal intensity that is higher than paging level 20dB when signal rate is 600 bauds, and this signal strength signal intensity is enough to provide a good paging in building to cover a big underpopulated rural area.Because ground signal intensity becomes quadratic power to change approximately with the beam cross-section diameter, then diameter is reduced to 200 miles when dwindling four times from 800 miles, can make signaling data speed increase to 9600 bauds and still can remain the required same signal strength signal intensity nargin of paging service that guarantees in good building is realized in densely populated urban district.
By with the sensing of the removable antenna 88 of joining antenna control systems 94 controls of satellite paging controller 82, it is scanned by predefined procedure and the scheduled time specified geographic location to earth surface.When the wave beam of removable antenna 88 referred to a certain location, then downstream transmitter 86 will be via paging signal generator 84 in distributing to the time slot of this position, with the paging signal of foregoing batch form emission corresponding to assigned address.
During work, satellite 24 scans the surface of the earth 26 by with predefined procedure removable antenna 88 being pointed to one period scheduled time of tellurian specified geographic location.When removable antenna 88 referred to a certain location, beam cross-section 28 and signaling data speed were adjusted to therewith on the corresponding value of ad-hoc location.Then satellite 24 in distributing to the time slot of this position with batch form emission corresponding to the paging signal of assigned address.
Be used for the satellite paging controller 82 of application drawing 3, control logic is shown in the flow chart of Fig. 4.
Fig. 5 shows the exemplary expression by a signal of satellite antenna 22 emissions.Signal 40 is time-division multiplex binary system paging signals, and it comprises crowd 42-50 of a sequence.Criticize every batch of geographical position among the 42-50 corresponding to an appointment in the scanning area that covers by satellite 24.For example, criticize 42 and can criticize 44 corresponding to Boston, criticize 46 corresponding to Chicago corresponding to New York, or the like.Be transmitted into suitable position in order with every batch.For example, the POCSAG signaling protocol is used as the signaling format of each batch.
Fig. 5 B shows every batch (for example, 42) and comprises a preorder 62 and follow-up N frame 64.
At last, Fig. 5 C shows the exemplary expression of the frame in Fig. 5 A.Frame 61 comprises a synchronous code 63 and follow-up corresponding to by this wholesale unique address identification code 65 of penetrating the geographical position that is covered.Identification code 65 government office in feudal China are continuous to be used for to predetermined beep-pager address signal 66.
The form of frame 61 makes and can utilize synchronous code 63 that the battery in beep-pager is saved the scanning sequence synchronised of operating with removable antenna.If satellite 24 transmits to its geographical position, then in a single day by after synchronous, it just is powered with the decoding paging signal beep-pager of working in a specific geographical position.This can make the beep-pager battery that the long life-span is arranged.
In addition, the work at present position of the identification code of frame 61 identification beep-pager.So if beep-pager is outside normal operation region, then identification code 65 provides the positional information an of different working modes that may be displayed on the display or can be used to start beep-pager (for example " roaming " pattern) to beep-pager.
Utilize the synchronous code 62 of suitable batch signal, in the satellite-signal emission process, the beep-pager in paging system is to extremely suitable synchronously the criticizing of their battery economy systems.After in case the beep-pager quilt is synchronous, the paging signal that it is suitable that it is promptly decoded.
A more detailed description is made in the work that receives according to the paging in Fig. 6, the 7 and 8 pairs of new satellite systems now.
Fig. 6 is the block diagram that is applicable to the paging receiver in the satellite paging system.Except an exception, it is exactly the selective call paging receiver of the routine known in the prior art.This exception be exactly the signal rate and the detection bandwidth of receiver be the position of depending on receiver.These parameters then both can be set by giving each position different beep-pager of manufacturing in the satellite system, also can make these parameters by being stored in the information change in yard plug-in unit.About the details of beep-pager how to make a variable bit-rate and decode bandwidth the U.S. Patent No. 4 that is entitled as " Radio Commanication Receiver With Apparatus for Altering the Bit Rate of the Receivcr " at the Davis that transfers assignee of the present invention, detailed description is arranged in 816,820.
Receiver among Fig. 6 has used a decoder 124 based on microprocessor, and it is decoded as Fig. 5 A by programmed, the signaling protocol shown in 5B and the 5C.In the assignee's who transfers the phase inventor who is entitled as " Universal Paging Device With Poqer Conservafion " Davis U.S. Patent No. 4518961, done introduction.Radio receiver is by antenna 128 received signals.The output of receiver 126 is delivered to microprocessor decoder 124 through low pass filter 130 and data amplitude limiter 132.Low pass filter 130 carries out communication with receiver control logic 134, and control logic then is subjected to the control of microprocessor 124.Also can see, microprocessor decoder 124 also with sign indicating number axle spare address and Chooser 136, output signal device 138 and carry out communication by customer controller and user.
Specifically, decoder is programmed to be searched for the signal from satellite, makes the timing synchronised of its decode operation and riding then.For synchronous with signaling waveform, decoder stays open before it solves down link signal always.Then, make decoder operation and received signal Synchronization with well-known simultaneous techniques, this comprises with received signal sets up bit synchronous and frame synchronization.The bit synchronous process comprises that the bandwidth of adjusting low pass filter makes it be matched with the bit rate of received signal.Finish after this step, receiver utilize then in the program ROM that both can be included in microprocessor decoder 124 or be included in information in a sign indicating number axle part and the apolegamy memory 136.The predetermined regularly synchronised of transmission with the downgoing line of the operation of its battery saving circuit and satellite.As a result, only at satellite during geographic area, beep-pager place transmits, receiver battery economy system just drives beep-pager.For example, Fig. 7 A shows preorder 62 and its follow-up synchronous code and subsequent identification partly once more.Identification partly and address number 130 formed and be referred to as to organize 1 zone.Shown in Fig. 7 A, each group all comprises first and second addresses successively, and synchronous code repeats once through 8 groups.So if programme receiver in response to the address of organizing 4, then the battery saving circuit in the receiver will be at following drive beep-pager.During the search operation 132 of searcher receiver preorder 62 and synchronous code 63, during the time interval 134 that is sending in group 4 address with in each synchronous code at interval during 136.
Fig. 8 A and 8B are the flow charts of describing operation of receiver.After the initialization, receiver is opened (140 frame),, behind predetermined period, receiver cut out (145) in a predetermined search (frame 144) search bit synchronously (142 frame) in the cycle.If bit synchronous obtains (146 frame) before this predetermined search cycle stops, then receiver begins the search (148) of its synchronous code again.Again the assumes synchronization sign indicating number be before the predetermined search cycle stops (152 frame) then position code will detect (154 frame), and battery is saved timing circuit by synchronous (156 frame).Receiver begins to search for an address signal (158 frame) then.If an address signal detected (160) mutually then will produce alarm signal (162 frame).If address signal is not detected (160 frame), then receiver continues address signal of search, when the indication of battery saving timing circuit is the battery saving now (164 frame).If the end of criticizing does not also detect (166 frame), then timer will place frame wait (168 frame) down.If detected the end of criticizing, then timer places and waits for next batch (170 frame).Which kind of situation no matter is at an appropriate time (174) receiver will be opened (172) afterwards.
After initialization, receiver is opened, and attempts to set up in the cycle synchronously at a predetermined search.The search of bit synchronous comprised the data with the various bit rates that are used for system are searched for.If bit synchronous obtains before this predetermined search cycle stops, then receiver will begin its search to synchronous code.Hypothesis again, synchronous code is detected before the predetermined search cycle stops, and then position code will be detected and battery saving timing circuit will be by synchronously.Receiver will begin the search address signal then.If detect an address signal, then and then produce an alarm signal.If do not detect address signal, then receiver will continue the search address signal when the indication of battery economy system timing circuit is the battery saving now.If also do not detect the end of criticizing, then timer will be placed in the wait next frame.If the end of criticizing has been detected, then timer will be placed in and wait for following batch, and in any case, receiver will be opened in the suitable time.
So, be appreciated that the invention of being declared can provide the paging of the building clam of practicality to cover in very broad zone.
Can recognize that also the invention of being declared can be used to provide the paging of real nationwide or intercontinental scope to cover.In addition, the present invention can also match by existing continental rise paging system, can obtain real nationwide covering when a calling user leaves its common geographical position.
Claims (10)
1, a kind of satellite letter signal system is characterized in that:
Satellite and
One connects mutually with described satellite a signal beam with variable beam cross-section is provided, and wherein the described signal beam that is provided by described antenna comprises a data-signal that variable-data-rate is arranged, and described data rate depends on described beam cross-section.
2, according to the satellite letter signal system of claim 1, described signal beam points to a plurality of tellurian positions in proper order, and described Antenna Design must be according to the described beam cross-section of described position change.
3, according to the satellite letter signal system of claim 2, wherein point to when having densely populated zone when described signal beam, described antenna changes its beam cross-section and data rate so that a minor beam cross section and a high data rate to be provided.
4, according to the satellite letter signal system of claim 2, wherein when described signal beam points to underpopulated zone, described antenna changes its beam cross-section and data rate so that a big beam cross-section and a low data rate to be provided.
5, according to the satellite letter signal system of claim 2, wherein said data-signal is characterized in that a plurality of signals are criticized with predefined procedure and arranges, wherein each batch is respectively corresponding to a zone, and each batch has identification code and corresponding predetermined launch time of one of them position of identification
Above-mentioned satellite letter signal system is characterised in that: comprise an emitter, it is used for launching described data-signal, described emitter and described day line locking, like this, when one of them position of described antenna direction, described emitter is launched batch corresponding to a position in described predetermined launch time.
6, satellite letter signal system according to claim 5, it is characterized in that comprising a portable selection signal receiver that is positioned at a described zone, described portable selection signal receiver is characterized in that being included in the receiving system that selectively drives in corresponding predetermined launch time, and it receives only corresponding to one of them position one batch.
7, according to the satellite letter signal system of claim 5, it is characterized in that comprising a portable selection signal receiver, be used for receiving the decode described data signaling,
Wherein when the described position code of demodulation, described portable selection signal receiver can with batch corresponding to described one of them position.
8, according to the satellite letter signal system of claim 1, wherein said satellite is characterized in that:
A satellite receiver that is used for received communication and control information;
With described antenna and the joining control device of described first receiver, in order to controlling according to described control information that described antenna sequentially points to a plurality of positions and according to the described beam cross-section of described a plurality of position changes, and
First transmitter that is coupled with antenna, it is used for launching described data-signal, wherein said data-signal is characterized in that comprising a plurality ofly to be criticized by predefined procedure with the signal of a data speed emission, every batch corresponding to a position in described a plurality of positions, every batch has an identification code that is used for discerning a described corresponding position, and wherein said data rate depends on described beam cross-section; And
Its feature of described satellite letter signal system also is to comprise at least one selective call receiver, this receiver is arranged in a position of a plurality of positions, be used for receiving described paging signal, wherein at least one the selective call receiver in a described position only responds corresponding to one of a position in described a plurality of positions batch.
9, a kind of method that is used for satellite to tellurian a plurality of positions transmission signalings is characterized in that comprising step:
A) antenna that is installed on the earth-orbiting satellite is aimed at a position in tellurian described a plurality of positions;
B) provide a signal beam with a footprint by described antenna, described footprint is then determined according to a described position;
C) by the signal of communication that position emission have a data speed to described a plurality of positions in of described antenna a scheduled time, described data rate is determined according to the signal beam footprint;
D) (a) to (c) being repeated in the next position in described a plurality of positions goes on foot.
10, according to the method for claim 9, its feature also is also to comprise step on step c:
E) drive a communication control processor in the described scheduled time, described communication control processor receives described signal of communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102902 CN1029445C (en) | 1991-05-06 | 1991-05-06 | Satellite signalling system having signal beam with variable beam area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102902 CN1029445C (en) | 1991-05-06 | 1991-05-06 | Satellite signalling system having signal beam with variable beam area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1066544A true CN1066544A (en) | 1992-11-25 |
| CN1029445C CN1029445C (en) | 1995-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102902 Expired - Fee Related CN1029445C (en) | 1991-05-06 | 1991-05-06 | Satellite signalling system having signal beam with variable beam area |
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| Country | Link |
|---|---|
| CN (1) | CN1029445C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563951B (en) * | 2006-12-18 | 2013-05-01 | 皇家飞利浦电子股份有限公司 | Beacon transmission and reception using directional antennas |
| CN108141266A (en) * | 2015-10-21 | 2018-06-08 | 华为技术有限公司 | The method of communication device and operation communication device |
| CN108282862A (en) * | 2017-01-06 | 2018-07-13 | 华为技术有限公司 | A kind of paging method and device |
| CN110463297A (en) * | 2017-03-24 | 2019-11-15 | 三星电子株式会社 | Method and apparatus for executing paging in mobile communication system |
| US11743862B2 (en) | 2017-03-24 | 2023-08-29 | Samsung Electronics Co., Ltd | Method and device for performing paging in mobile communication system |
-
1991
- 1991-05-06 CN CN 91102902 patent/CN1029445C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563951B (en) * | 2006-12-18 | 2013-05-01 | 皇家飞利浦电子股份有限公司 | Beacon transmission and reception using directional antennas |
| CN108141266A (en) * | 2015-10-21 | 2018-06-08 | 华为技术有限公司 | The method of communication device and operation communication device |
| CN108141266B (en) * | 2015-10-21 | 2020-12-08 | 华为技术有限公司 | Communication device and method of operating a communication device |
| CN108282862A (en) * | 2017-01-06 | 2018-07-13 | 华为技术有限公司 | A kind of paging method and device |
| CN108282862B (en) * | 2017-01-06 | 2024-01-30 | 华为技术有限公司 | Paging method and device |
| CN110463297A (en) * | 2017-03-24 | 2019-11-15 | 三星电子株式会社 | Method and apparatus for executing paging in mobile communication system |
| US11463986B2 (en) | 2017-03-24 | 2022-10-04 | Samsung Electronics Co., Ltd | Method and device for performing paging in mobile communication system |
| US11743862B2 (en) | 2017-03-24 | 2023-08-29 | Samsung Electronics Co., Ltd | Method and device for performing paging in mobile communication system |
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| Publication number | Publication date |
|---|---|
| CN1029445C (en) | 1995-08-02 |
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