CN1407347A - Satellite positioning method by utilizing synchronous satellite - Google Patents
Satellite positioning method by utilizing synchronous satellite Download PDFInfo
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- CN1407347A CN1407347A CN 01108762 CN01108762A CN1407347A CN 1407347 A CN1407347 A CN 1407347A CN 01108762 CN01108762 CN 01108762 CN 01108762 A CN01108762 A CN 01108762A CN 1407347 A CN1407347 A CN 1407347A
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Abstract
The method is used for location by three synchronous satellites. The user receiver takes the signals which transmit by a ground station to three satellites and then go back to the ground and records the time differences of the said signals from the three satellites respectively. A computer can calcualte out the longitude and latitude of the user according to the time differences and the height of the user's location.
Description
(1) technical field of the present invention:
The invention belongs to the radio direction finding field, belong to the positioning signal that at least 3 satellites of utilization send especially and on receiver user, receive the formed mistiming, and in conjunction with the sea level elevation information of receiver user, by calculating the method for locating.
(2) background technology:
At present, the global positioning satellite method mainly contains following several: method 1. is set up by the DOD of U.S. Department of Defense, by 24 (comprising 3 Hot Spare stars) relatively earth high-speed cruising, constitute apart from floor level about 20,000 kilometers specific satellite and respective receiver; The Double-Star Positioning System system of method 2. China development utilizes 2 earth synchronous satellites to position; Method 3. Chinese patent application (number of patent application is 95119688.1) disclose " adopting the location and the communication system of a plurality of satellite constellations ", adopt the synchronous satellite of 6 above earth basic synchronization of two constellations to position; Method 4. Chinese patent application (number of patent application is 99110536.2) disclose " carrying out the method and apparatus of passive ground positioning estimation in the satellite communication system ", utilize the high-speed mobile of satellite with respect to ground, the satellite multi-beam is scanned the user, thereby position according to wave beam information and satellite information.These methods have following shortcoming, and method 1. is 1.. and system needs a large amount of specific satellite, and investment is big, the construction period is long, operating cost is high; 2.. receiver need receive 4 specific satellite signals of not stopping transport capable at least, thereby the directional antenna of inconvenience employing high directivity, and is easily disturbed; 3.. because the satellite that runs up inevitably produces big orbital drift, make system's positioning error bigger; Method 2. is 1.. can not carry out three-dimensional localization to the user; 2.. positioning signal has the time-delay of long period, can not carry out real-time positioning; 3.. each is with taking certain satellite channel separately per family, user's usage charges height; 4.. system is subjected to the restriction of satellite communication capacity, and number of users is limited; 5.. Double-Star Positioning System belongs to replys the formula location, outside transmitting radio slope, confidentiality is poor; Method 3: 1.. belong to equally and reply the formula location, outside emitting radio wave, confidentiality is poor; 2.. 6 satellites of 2 constellations of minimum need, method, equipment complexity, cost height; Method 3: 1.. the repeatedly satellite information that this invention needs to receive in the certain hour section could be located, and can not carry out real-time positioning; 2.. satellite needs to make high-speed motion in ground highly relatively at distance ground 500-1000 kilometer, and utilizes multiple-beam antenna to ground based scanning, and bearing accuracy is lower, and the directional antenna of user's inconvenience employing high directivity, and is easily disturbed; 3.. satellite-signal must be used the high-performance satellite antenna emission of high precision, multi-beam, and must form cellular signal cell on ground could locate, satellite equipment, complex structure, cost is higher, and is subjected to factor affecting such as atmospheric environment bigger.
(3) content of the present invention:
In view of this, how a kind of positioning service is provided, utilizes existing satellite as far as possible, by minimum number of satellite and rent communication channel on it again in conjunction with user's sea level elevation information, just can realize zone or global user's location needs, the present invention grinds wound motivation place just.
Purpose of the present invention provides a kind of satellite positioning method.It can utilize existing satellite resource, small investment, and precision height, strong interference immunity, good confidentiality, characteristics that cost is low are arranged.
For realizing above-mentioned purpose of the present invention, the invention is characterized at least 3 satellite 1,2,3 emission positioning signals at diverse location, measured point P receiver receives the signal of satellite 1,2,3 respectively, the positioning signal that determines synchronous satellite 1,2,3 arrives the time difference that measured point P forms, and, can calculate the longitude and latitude at place, measured point by mathematical computations in conjunction with the sea level elevation information at P receiver place, measured point.
The satellite of 3 diverse locations that is further characterized in that of the present invention is the synchronous stationary satellite that is positioned at the synchronous geo-stationary orbit of the earth; Tracking telemetry and command station is quoted high precision clock, according to the range difference of different satellites and tracking telemetry and command station, not to 3 synchronous satellites, 1,2,3 emission positioning signals, makes the synchronous satellite of diverse location transmit positioning signal synchronously earthward with the certain hour difference; Or synchronous satellite 1,2,3 utilizes satellite clock to send positioning signal synchronously earthward under the monitoring of tracking telemetry and command station; The information that in the positioning signal of satellite transmission, includes satellite-orbit information, satellite-signal is synchronous and eliminates positioning error; The receiving antenna of receiver can be directional antenna or high directivity antenna; The sea level elevation information at receiver user place can be obtained by height indicator, the digital map that receiver user is provided for oneself or the user manually sets.
The present invention can utilize existing satellite resource, send positioning signal earthward as long as on each selected satellite, rent one road communication channel, as long as the user is equipped with the receiver through permission, and the height indicator of providing for oneself by receiver user, digital map obtains or the artificial sea level elevation information of setting of user, the user just can calculate voluntarily and determine residing position, so small investment, cost are low; According to conventional theoretical, 3 synchronous stationary satellites can cover earth all surface except that south, Arctic Realm, therefore, the positioning service of scope covering the whole world, need only rent three groups of satellites, and every group of 3 satellites can provide the global location service.Receiver can adopt directional receiving antenna or high directivity antenna receiving satellite signal, makes this method strong interference immunity; Satellite positioning signal adopts the forms of broadcasting to play earthward, thereby system user quantity is unrestricted; Owing to adopt earth synchronous satellite, satellite is motionless with respect to geostationary, apart from the sea level about 3.6 ten thousand kilometers, the relative ground of satellite drift speed is little, station accuracy is high, and but utilizing meteorological date propagates the error that causes to satellite positioning signal and accurately revises in atmospheric envelope, so the present invention also has the high characteristics of precision.
(4) description of drawings:
The present invention is described further below in conjunction with accompanying drawing.
Fig. 1 is a signal transmitting and receiving synoptic diagram of the present invention;
Fig. 2 is a signal flow graph of the present invention;
Fig. 3 is a synoptic diagram of setting up the earth and measured point coordinate system of the present invention;
Fig. 4 is the process flow diagram that receiver signal of the present invention is handled.
(5) principle of the present invention and specific implementation:
Measured point, ground P receiver receives the positioning signal of synchronous satellite 1,2,3 respectively, the positioning signal that determines satellite 1,2,3 arrives the time difference that measured point P forms, because satellite 1,2,3 is constant ρ=35784000m apart from the height on terrestrial equator sea level, the orbit coordinate of satellite 1,2,3 is to know number the sixth of the twelve Earthly Branches, and radio propagation speed is constant v.As the positioning signal of satellite 1 and the positioning signal arrival measured point P formation time difference C1 of satellite 2; The positioning signal of the positioning signal of satellite 1 and satellite 3 arrives measured point P formation time difference C3; The positioning signal of the positioning signal of satellite 2 and satellite 3 arrives measured point P formation time difference C2.Referring to Fig. 3, with ground ball center is true origin O, equatorial plane is the XOY coordinate surface, Z axle forward energized north hemisphere is set up coordinate system, sea level elevation, earth spherical equation in conjunction with P place, measured point, according to knowing condition above-mentioned the sixth of the twelve Earthly Branches, can obtain the longitude and the latitude at P place, measured point by mathematical computations, thereby finish the location.The method of mathematical computations has many kinds, is here to receive standard signal with ground control station and satellite 1,2,3 sending and receiving to form signal to transmit net be that example describes: P point warp, latitude are:
α is a P point longitude in the formula, and β is a P point latitude.((X-XS1)
2+ (Y-YS1)
2+ (Z-ZS1)
2)
1/2-((X-XS2)
2+ (Y-YS2)
2+ (Z-ZS2)
2)
1/2=C1*V ((X-XS1)
2+ (Y-YS1)
2+ (Z-ZS1)
2)
1/2-((X-XS3)
2+ (Y-YS3)
2+ (Z-ZS3)
2)
1/2=C3*V ((X-XS2)
2+ (Y-YS2)
2+ (Z-ZS2)
2)
1/2-((X-XS3)
2+ (Y-YS3)
2+ (Z-ZS3)
2)
1/2=C2*V finds the solution with mathematical method above-mentioned system of equations, calculates X, Y, the Z that can try to achieve in the formula in conjunction with P point sea level elevation, earth spherical equation again, thereby calculates warp, latitude that P is ordered, to finish satnav.
Referring to Fig. 1 and Fig. 2.Tracking telemetry and command station 4 sends positioning signal with the certain hour difference respectively to synchronous satellite 1,2,3, makes positioning signal arrive synchronous satellite 1,2,3 simultaneously; After stationary satellite 1,2,3 is received positioning signal synchronously, transponder via satellite again, launch positioning signal earthward, the antenna that is positioned at the location receiver P (as being positioned at ground, waterborne, aerial etc.) of any position of the earth receives the positioning signal of transmitting from satellite 1,2,3 respectively.
Because the distance between location receiver P and the synchronous satellite 1,2,3 has nothing in common with each other, and has certain range difference, so the positioning signal arrival location receiver P that synchronous satellite 1,2,3 is transmitted also exists the regular hour poor.Referring to Fig. 4." satellite signal receiver " unit in location receiver P receives positioning signal, and detect after each positioning signal arrives time difference that receiver P forms, locating information, again should the time difference, locating information and sea level elevation information and other positioning signal send processor unit to.Under the cooperation of storer, clock, I/O unit, warp, latitude computing method according to measured point P of the present invention, calculate warp, the latitude of P point position, and show by display unit, export this information by I/O unit again, use for other equipment of user, to finish the location of measured point P.
In sum, the solution of the present invention can be utilized 3 satellites of existing diverse location, by renting a transponder channel on each satellite, just can realize that the receiver user of being equipped with through permission locatees voluntarily, as long as satellite sent positioning signal in 24 hours, then the user just can enjoy 24 hours positioning service.Obviously the present invention is the new design of a kind of novelty, progress and dark tool practicality.The above is specific embodiments of the invention and the know-why used, if the equivalence of doing according to conception of the present invention changes, when the function that it produced does not exceed spiritual that instructions and accompanying drawing contain yet, all should be within the scope of the invention, explanation hereby.
Claims (7)
1. method of utilizing satnav, it is characterized in that at least 3 satellites (1), (2), (3) emission positioning signal at diverse location, measured point P receiver receives the positioning signal of satellite (1), (2), (3) emission respectively, the positioning signal that determines synchronous satellite (1), (2), (3) emission arrives the time difference that measured point P forms, the sea level elevation information of measured point P is obtained in the digital map that is equipped with by measured point P receiver, height indicator or artificial setting again, and promptly available mathematical method calculates longitude, the latitude at P place, measured point.
2. the method for utilizing satnav according to claim 1 is characterized in that the satellite of 3 diverse locations is the satellite that is positioned at the synchronous geo-stationary orbit of the earth.
3. the method for utilizing satnav according to claim 1 and 2, it is characterized in that tracking telemetry and command station quotes high precision clock, range difference according to different satellites and tracking telemetry and command station,, the satellite of diverse location is transmitted synchronously earthward sent positioning signal to 3 satellites (1), (2), (3) emission positioning signal with the certain hour difference; Or satellite (1), (2), (3) utilize its clock to send positioning signal synchronously earthward under the monitoring of tracking telemetry and command station.
4. the method for utilizing satnav according to claim 1 and 2 is characterized in that in the positioning signal of satellite transmission, the information that includes satellite drift, satellite-signal is synchronous and eliminates positioning error.
5. the method for utilizing satnav according to claim 3 is characterized in that in the positioning signal of satellite transmission, the information that includes satellite drift, satellite-signal is synchronous and eliminates positioning error.
6. the method for utilizing satnav according to claim 1, the receiving antenna that it is characterized in that location receiver can be directional antenna or high directivity antenna.
7. the method for utilizing satnav according to claim 1 and 2 is characterized in that location receiver is equipped with digital map, height indicator or the artificial setting device that can obtain user's sea level elevation information.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108762 CN1407347A (en) | 2001-08-16 | 2001-08-16 | Satellite positioning method by utilizing synchronous satellite |
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| CN 01108762 CN1407347A (en) | 2001-08-16 | 2001-08-16 | Satellite positioning method by utilizing synchronous satellite |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323856A (en) * | 2013-06-27 | 2013-09-25 | 中国空间技术研究院 | Method for locating non-cooperative wireless signal source based on high-rail three-satellite time-difference system |
| CN103727919A (en) * | 2014-01-16 | 2014-04-16 | 中国地质调查局西安地质调查中心 | Digital finder method employing geostationary satellite of stationary orbit |
-
2001
- 2001-08-16 CN CN 01108762 patent/CN1407347A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323856A (en) * | 2013-06-27 | 2013-09-25 | 中国空间技术研究院 | Method for locating non-cooperative wireless signal source based on high-rail three-satellite time-difference system |
| CN103727919A (en) * | 2014-01-16 | 2014-04-16 | 中国地质调查局西安地质调查中心 | Digital finder method employing geostationary satellite of stationary orbit |
| CN103727919B (en) * | 2014-01-16 | 2016-06-08 | 中国地质调查局西安地质调查中心 | A kind of stationary orbit geostationary satellite numeral method for searching star |
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