CN100385996C - Method for positioning RTK based on TD-SCDMA - Google Patents
Method for positioning RTK based on TD-SCDMA Download PDFInfo
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- CN100385996C CN100385996C CNB2006100543959A CN200610054395A CN100385996C CN 100385996 C CN100385996 C CN 100385996C CN B2006100543959 A CNB2006100543959 A CN B2006100543959A CN 200610054395 A CN200610054395 A CN 200610054395A CN 100385996 C CN100385996 C CN 100385996C
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Abstract
In the positioning service field there is no any service that can meet the positioning request of user at state of high accuracy and high moving speed. The invention embeds both quasi RTK and RTK methods into TD-SCDMA system to design the positioning process, define the relevant communication interface and message and select different algorithm according to the user's QoS requirement to meet the need of positioning request in different accuracy level.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to TD-SCDMA (TD SDMA access) location technology.
Background technology
Location Based Services is called location service again, and (Location Based Services LBS), is a kind of value-added service that is provided by mobile radio communication.Existing wireless location technology is based on the communication of mobile terminal base station, affected by environment bigger, particularly more owing to high-lager building in the city, radio propagation environment is bad, signal is difficult to directly arrive from the base station travelling carriage, generally will pass through reflection, refraction and diffraction, so positioning accuracy can be affected, orientation range is 100～200 meters, and the ordinary circumstance location response time is between 3～6s.Can only satisfy the Location Request of domestic consumer, but can't satisfy some particular request of user, comprise the position requests under high accuracy and the high-speed mobile situation.
The data transmissions force rate 2G system of 3G system improves a lot, for provide abundanter information that the assurance of the network bandwidth is provided to the user, make the bigger positioning service of some amount of information realize becoming possibility by wireless network, as map demonstration, real-time navigation, even the 3D Map Services etc.Localization method that can satisfy the requirement of user's hi-Fix or the real-time dynamic positioning data are provided under high-speed moving state of design can remedy the deficiency that has the LBS business now in TD-SCDMA, enrich the data service type of TD-SCDMA system.
Summary of the invention
The present invention proposes the localization method that adopts the GPS-RTK technology in a kind of TD-SCDMA system, utilize the accuracy and the real-time dynamic of real-time dynamic positioning technology RTK (Real Time Kinematic) location, simultaneously accurate RTK and two kinds of algorithms of RTK are embedded in the navigation system flow process, can provide the different accuracy level other location-based service according to user's demand, satisfy TD-SCDMA mobile subscriber high accuracy and real-time and dynamic Location Request.
The technical solution adopted for the present invention to solve the technical problems is: embed RTK and two kinds of location algorithm modules of accurate RTK in the TD-SCDMA system, the positioning flow of design RTK, defining interface and message, the quality of service requirement that comprises in the Location Request according to the portable terminal transmission is selected RTK or accurate RTK location algorithm, and startup location Calculation unit PCU/QPCU, after mobile terminal locations calculating is finished in the location Calculation unit, positional information is sent in the location server stores, and send to terminal and show.
The definition interface and message comprise: the Uu of system definition and Iu interface, between CN and location server self-defining CN-LS interface, locating request message, GPS supplementary request message, GPS supplementary response message, location information requests message, locating information response message and location information message.
The Location Request that portable terminal sends comprises quality of service requirement and portable terminal place cell information, sends GPS assist location information request to location server simultaneously; After location server receives solicited message, the ephemeris information that will be stored in this sub-district visible satellite in the location server according to portable terminal place cell information sends to portable terminal, help terminal to search appropriate satellite rapidly, and obtain the required carrier phase data in location.Core network CN obtains terminal affiliated subdistrict position by Home Location Register HLR (Home Location Register) after receiving the Location Request of portable terminal, terminal request message after the Primary Location is sent to RNC module among the UTRAN, RNC selects a suitable location algorithm and locatees desired data to portable terminal and base station requests according to the portable terminal quality of service requirement, after receiving the two data of sending response, be transmitted to position calculation unit PCU, after calculate the PCU completing place, store being sent in the location server after the positional information calculation, and send to the terminal demonstration.
Framing signal measurements and calculations function can be finished on portable terminal, also can be distributed to TD-SCDMA grid side and finish, to alleviate the burden of portable terminal.
The invention has the beneficial effects as follows: in system, embed the location algorithm of two kinds of different accuracies simultaneously, can require to select different location algorithms, realize different positioning accuracies, increased the flexibility of LBS according to QoS of customer.Satisfy the hi-Fix of mobile subscriber in the TD-SCDMA system and the Location Request under the high-speed mobile situation.
Description of drawings
Location-based service architecture when Fig. 1 represents to be applicable to the high-precision real of TD-SCDMA system;
Fig. 2 represents the accurate RTK positioning flow of the RTK/ of side Network Based figure;
Fig. 3 represents the accurate RTK positioning flow of the RTK/ figure based on portable terminal.
Embodiment
RTK is a kind of real-time dynamic positioning technology of the carrier phase observation data that sends based on gps satellite, under the RTK mode of operation, base station sends its measured value and observation station coordinate information to rover station together by data chainning, rover station is not only by the data of data chainning acceptance from base station, also to gather the GPS observation data, and in system, form the difference measured value and handle in real time, provide positioning result simultaneously.RTK is divided into two classes: revised law and calculus of finite differences.The former is identical with pseudo range difference, and base station sends to subscriber station with the carrier phase correction, to correct its carrier phase, finds the solution coordinate then.The latter sends to rover station with the carrier phase of base station collection and asks poor, resolves coordinate.The former RTK technology that is as the criterion, its precision can reach decimeter grade; The latter is real RTK technology, can realize the Centimeter Level precision.
Location-based service architecture when as shown in Figure 1, having described the high-precision real of TD-SCDMA system.
Position measurement and computational process can be implemented at mobile terminal side, also can implement at network side.At TD-SCDMA system first stage of construction, integrated GPS chip in portable terminal, the position measurement of the accurate RTK of RTK/ location and computational process can be placed on end side and finish.When treating that network is ripe, location measurement unit LMU (Location Measurement Unit) and two position calculation unit are set in the UTRAN unit in the TD-SCDMA system, be as the criterion respectively RTK position calculation unit QPCU and RTK position calculation unit PCU (Position Calculation Unit), completing place measurements and calculations function.Thereby realize the equiblibrium mass distribution of calculated load.
UTRAN (Universal Terrestrial Radio Access Network) is made up of one or more RNS RNS.A RNS is made up of a radio network controller (RNC) and one or more Node B.Information between portable terminal and the UTRAN is followed TD-SCDMA wave point (Uu) standard and is communicated.Enable in network transmission process, to be identified.
Among the TD-SCDMA system core network C N, GMLC GMLC (GatewayMobile Location Centre) is responsible for receiving the Location Request that the mobile subscriber sends, comprise cell information and quality of service requirement QoS in the Location Request, request message sends to UTRAN by moving exchanging center MSC, the UTRAN module comprises base station and the radio network controller (RNC) of being with LMU, RNC is responsible for transmitting positioning request information to the base station, select location algorithm according to cell information that comprises in the Location Request and quality of service requirement QoS, and the locating information of base station in response is sent to the accurate RTK position calculation unit of RTK/.
Following the Iu interface standard that defines in the TD-SCDMA standard between CN and the UTRAN communicates, finish if be positioned in the network, then carry out among the location Calculation unit PCU/QPCU of location Calculation in UTRAN, otherwise will locate desired data and send to portable terminal, on terminal, finish location Calculation, at last position data is sent to location server by CN and store.
Location server is based on spatial database and support temporal index so that carry out inquiries such as scope, history, track.GPS receiver in the GPS grid of reference is connected with location server and is used for following the tracks of and collecting all satellites (satellite 1 ... satellite 24) supplementary such as ephemeris, follow the core network CN extracting position data of ICP/IP protocol from the TD-SCDMA system simultaneously and preserve, form is followed the hereinafter definition of CN-LS interface.
As shown in Figure 2, be illustrated in the accurate RTK positioning flow of the RTK/ figure that network side is implemented the location Calculation function.Be that signal measurement and location Calculation are distributed in the positioning flow figure when finishing among the UTRAN of TD-SCDMA network.
Send Location Request by portable terminal to the TD-SCDMA network, solicited message comprises quality of service requirement and cell information, terminal sends to location server by the TD-SCDMA network with self cell information and GPS supplementary, so that obtain the ephemeris information of visible satellite in this sub-district.After location server receives request, the cell information of sending according to terminal returns the ephemeris information of visible satellite in the sub-district, terminal utilizes this information satellite to be searched for and collected required carrier phase data, and sends the data to the position calculation unit among the UTRAN.RNC judges according to qos requirement after receiving the Location Request that CN sends, select accurate RTK or RTK location algorithm, come to the different locating information of base station requests with this, the base station receives after the request a series of information such as self accurate coordinates, differential data or carrier phase data is sent to corresponding position calculation unit by RNC.The enable position computing unit, position calculation unit (PCU/QPCU) is utilized the carrier phase data of terminal observation and is received the data that send the base station, comprise base station self-position coordinate, base station carrier phase observations value or base station carrier phase place correction value, call corresponding location algorithm, calculate mobile terminal locations, and result of calculation is sent to the location server storage by CN.
As shown in Figure 3, expression is based on the accurate RTK positioning flow of the RTK/ figure of portable terminal.Be signal measurement and the location Calculation positioning flow figure when all on terminal, finishing.Embedded RTK and accurate RTK location algorithm module in portable terminal, signal measurement and location Calculation are all finished on terminal.Terminal sends Location Request, obtain the supplementary that location server is sent, comprise information such as GPS visible satellite number, satellite ephemeris, terminal utilizes supplementary to carry out the visible satellite search of sub-district, portable terminal place obtaining required carrier phase data, and Search Results is kept on the terminal.On the other hand, the base station sends to terminal with this positioning request information by the Uu interface after receiving the positioning request information that portable terminal sends by CN, position calculation unit is according to the quality of service request in the positioning request information in the portable terminal, start RTK or accurate RTK algoritic module, utilize the carrier phase data of terminal observation and receive the data that send the base station, comprise base station self-position coordinate, base station carrier phase observations value or base station carrier phase place correction value, carry out mobile terminal locations and calculate, and result of calculation is sent to the location server storage.
In the position fixing process except that defined parts of TC-SCDMA system and interface standard, self-defining a plurality of functional part and communication interface and message have also been related to, three interfaces have mainly been used, the Uu and the Iu interface that comprise TD-SCDMA system definition, be used in respectively between portable terminal and the UTRAN, and carry out message communicating between URTAN and the CN; Between CN and location server, used self-defining CN-LS interface; The message that uses in the definition procedure mainly comprises: locating request message, GPS supplementary request message, GPS supplementary response message, location information requests message, locating information response message and location information message.Concrete implication and function are as shown in the table.
Table 1. functional part title and function
| Unit number | Component names | The present position | Major function |
| 1 | QPCU | RNC parts in the UTRAN module | Carry out accurate RTK position calculation |
| 2 | PCU | RNC parts in the UTRAN module | Carry out the RTK position calculation |
The explanation of table 2. communication interface
| Interface index | Interface name | The present position | Transmission means | Message format |
| 1 | The Uu interface | Between portable terminal and the UTRAN | The TD-SCDMA air-interface standard | Normative reference or provide by the system development merchant |
| 2 | The Iu interface | Between UTRAN and the CN | The TD-SCDMA air-interface standard | Normative reference or provide by the system development merchant |
| 3 | The CN-LS interface | Between CN and the location server | TCP/IP | The message-length message content |
The definition of table 3. message implication
| Message numbering | Message name | Message content | Affiliated interface |
| 1 | Location Request | Quality of service requirement, the portable terminal cell information | Uu interface Iu interface |
| 2 | The request of GPS supplementary | The portable terminal cell information | Uu interface Iu interface CN-LS interface |
| 3 | The response of GPS supplementary | The visible satellite ephemeris in sub-district, portable terminal place | Uu interface Iu interface CN-LS interface |
| 4 | Location information requests | Selected location algorithm | Uu interface RNC-base station |
| 5 | The locating information response | The carrier phase information of portable terminal observation, accurate RTK algorithm base station sends satellite ephemeris information, difference information and self accurate coordinates; RTK algorithm base station sends satellite ephemeris information, carrier phase information and himself accurate coordinates | Uu interface base station-RNC |
| 6 | Positional information | Final positioning result to terminal | Uu interface Iu interface CN-LS interface |
The present invention requires to select different location algorithms according to QoS of customer, realizes different positioning accuracies, has increased the flexibility of LBS.Satisfy the hi-Fix of mobile subscriber in the TD-SCDMA system and the Location Request under the high-speed mobile situation.
Claims (4)
1. localization method based on the TD-SCDMA system, it is characterized in that: in system, embed RTK and accurate RTK location algorithm module, definition Uu, Iu interface and CN-LS interface, the definition locating request message, GPS supplementary request message, GPS supplementary response message, location information requests message, locating information response message and location information message, select RTK or accurate RTK location algorithm according to the Location Request that comprises quality of service requirement and portable terminal place cell information that portable terminal sends, and startup location Calculation unit carries out mobile terminal locations calculating, after mobile terminal locations calculating is finished in the location Calculation unit, positional information is sent in the location server stores, and send to terminal and show.
2. localization method according to claim 1 is characterized in that: the location algorithm module is embedded in mobile terminal side or network side.
3. localization method according to claim 2 is characterized in that: when the location algorithm module is embedded in network side, positioning flow specifically comprises: portable terminal sends Location Request and the request of GPS assist location; After location server receives solicited message, the ephemeris information of sub-district, portable terminal place visible satellite is sent to portable terminal; Sub-district, mobile terminal to search place visible satellite, and obtain the carrier phase data; The quality of service requirement that comprises in the Location Request according to the portable terminal transmission, radio network controller (RNC) is selected location algorithm; Start the location Calculation unit that is positioned at network side, calculate mobile terminal locations and result of calculation is sent to location server.
4. localization method according to claim 2 is characterized in that: when the location algorithm module is embedded in mobile terminal side, positioning flow specifically comprises: portable terminal sends Location Request to network, and location server returns the GPS supplementary to portable terminal; Portable terminal is according to above-mentioned supplementary search sub-district, place visible satellite, to obtain the carrier phase data; Position calculation unit is according to the quality of service request in the positioning request information in the portable terminal, start RTK or accurate RTK algoritic module, utilize the carrier phase data of terminal observation and the data that send the base station, calculate mobile terminal locations and result of calculation is sent to location server.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101247161B (en) * | 2007-02-13 | 2012-01-18 | 天津通广集团振通电子有限公司 | Short wave low pass communication system |
| US8390512B2 (en) | 2009-06-05 | 2013-03-05 | Qualcomm Incorporated | On demand positioning |
| CN102098656B (en) * | 2009-12-15 | 2015-04-22 | 中国移动通信集团公司 | Method, system and device for acquiring position information of user terminal |
| CN102761961B (en) * | 2011-03-12 | 2015-02-18 | 广东工业大学 | DGNSS and NRTK system embedded in cellular network system |
| CN103792556B (en) * | 2012-11-02 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of select satellite-signal to carry out position and/or Time Calculation method and terminal |
| CN103852773B (en) * | 2012-11-30 | 2016-07-06 | 泰斗微电子科技有限公司 | A kind of alignment system based on cloud computing technology and localization method |
| CN108353246B (en) * | 2015-10-29 | 2020-08-07 | 华为技术有限公司 | Positioning method, server, base station, mobile terminal and system in mobile network |
| AU2016345346C1 (en) * | 2015-10-29 | 2019-09-05 | Huawei Technologies Co., Ltd. | Positioning method in mobile network, base station, and mobile terminal |
| CN110531391A (en) * | 2019-09-04 | 2019-12-03 | 北京麦飞科技有限公司 | Field navigation methods and systems based on dynamic carrier phase difference technology |
| CN112904372B (en) * | 2021-04-22 | 2024-01-12 | 电子科技大学 | Auxiliary satellite navigation system and positioning method thereof |
| CN114364014A (en) * | 2021-11-30 | 2022-04-15 | 国网安徽省电力有限公司信息通信分公司 | 5G terminal-based positioning method and system suitable for power system |
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