CN103558607B - A kind of active broadcasting method of ionized layer TEC of position-based information and system - Google Patents
A kind of active broadcasting method of ionized layer TEC of position-based information and system Download PDFInfo
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- CN103558607B CN103558607B CN201310488613.XA CN201310488613A CN103558607B CN 103558607 B CN103558607 B CN 103558607B CN 201310488613 A CN201310488613 A CN 201310488613A CN 103558607 B CN103558607 B CN 103558607B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/07—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
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Abstract
The present invention relates to a kind of active broadcasting method of ionized layer TEC and system of position-based information, method comprises: user is on the subscriber terminal by User Interface or API transmitting terminal geographic location and temporal information; The information that user submits to is passed to physical server by virtual server; Physical server calculates ionized layer TEC according to the ionospheric model preset and feeds back to virtual server; Ionized layer TEC is turned back to user terminal by virtual server; Ionized layer TEC is converted to Ionospheric delay correcting information by user terminal.Compared with prior art, the mathematical method of ionosphere modeling is separated with user by the inventive method, the ionized layer TEC that user only needs receiving system to broadcast and without the need to ionospheric model coefficient, effectively reduce the complexity of receiver end data processing, facilitate the unitarity of receiver end data processing module, the present invention has the advantages such as high-performance, high security, extensibility, controllability and universality.
Description
Technical field
The present invention relates to the one application of survey field location-based service, especially relate to a kind of active broadcasting method of ionized layer TEC and system of position-based information.
Background technology
Ionosphere delay error is the most significant error source in satellite navigation location.GNSS (GlobalNavigationSatelliteSystem) dual-frequency receiver user can adopt double frequency iono-free combination method to eliminate most errors of ionosphere delay.And for vast single frequency receiving user, still need at present to rely on ionospheric model to correct ionosphere delay.Conventional ionospheric model has Klobuchar model, multinomial model, trigonometric function model, the humorous model of ball, grid model etc.GPS and the Big Dipper are all broadcast Klobuchar model coefficient by broadcast ephemeris thus are realized Ionospheric delay correcting.Klobuchar ionospheric model simplifies based on Bent ionosphere empirical model, can react ionospheric basic variation characteristic, ensure that the reliability of ionospheric forecast from large scale.But this model is difficult to take ionospheric localized variation characteristic into account, and precision is restricted.Experience shows, this model only can correct 50 ~ 60% of ionosphere effect, is no more than 75% under best-case.Regional ionospheric model provides high-precision Ionospheric delay correcting information, is that GNSS single frequency receiving corrects the ideal and effective method of ionosphere delay impact.Regional ionospheric model is compared the empirical models such as Klobuchar and is compared and can simulate the disturbance of local electric absciss layer better, for region GNSS single frequency receiving user provides the Ionospheric delay correcting information of degree of precision.The research of domestic many scholars to regional ionospheric model achieves abundanter achievement, sets up ionospheric model as adopted generalized trigonometric series function, utilizes spherical cap harmonic to set up regional ionospheric model, based on the three-dimensional ionospheric model of Empirical Orthogonal Function, the foundation of graticule mesh ionospheric model and the trial result etc.It is east longitude 70 ~ 145 ° that China's Beidou satellite navigation system D2 navigation message contains coverage, north latitude 7.5 ~ 55 °, amounts to 320 grid points ionosphere vertical delay parameters.User only needs Ionospheric delay correcting grid points ionosphere delay interpolation being obtained observation satellite point of puncture place, then uses mapping function can obtain the Ionospheric delay correcting of signal propagation direction.The mode that this use navigation message is broadcasted ionosphere delay information, can meet the demand that the most of public users (as cellphone subscriber, vehicle mounted guidance user) in regional is located, but differ precision measurement users such as meeting measurement type receiver surely.For the GNSS single frequency receiving user of precision measurement, regional ionospheric model is needed to be provided high-precision Ionospheric delay correcting information.Structure due to each ionospheric model have employed different mathematical methods, be difficult to determine which model is more excellent, the model coefficient using various model to calculate needed for ionosphere delay is different on value volume and range of product, and the Ionospheric delay correcting taked during Data processing of receiver depends on adopted ionospheric model.If build the mathematical method that adopts of ionospheric model when upgrading or change, the data processing module of all uses this kind of ionospheric model correspondingly must be upgraded, larger difficulty is caused to the maintenance of software and renewal.And in fact no matter adopting which kind of ionospheric model, receiver finally only needs to obtain ionosphere total electron content (TotalElectronContent, TEC) and then convert to obtain Ionospheric delay correcting information and can correct ionosphere delay.
Summary of the invention
Object of the present invention is exactly provide a kind of active broadcasting method of ionized layer TEC and system of position-based information to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions: a kind of active broadcasting method of ionized layer TEC of position-based information, is characterized in that, comprise the following steps:
(1) user passes through geographic position and the temporal information at User Interface or API transmitting terminal place on the subscriber terminal;
(2) information that user submits to is waited for and received to virtual server;
(3) information that user submits to is passed to physical server by virtual server;
(4) position that virtual server transmits and temporal information are waited for and received to physical server;
(5), after physical server receives position and temporal information, calculate ionized layer TEC according to the ionospheric model preset and feed back to virtual server;
(6) ionized layer TEC is turned back to user terminal by User Interface or API by virtual server;
(7) user terminal receives ionized layer TEC, and is converted into Ionospheric delay correcting information.
A kind of active broadcasting system of ionized layer TEC of position-based information, it is characterized in that, comprise user terminal, virtual server and physical server, described user terminal and virtual server are connected to each other, described virtual server and physical server are connected to each other, and described physical server is set up ionospheric model.
Described user terminal is mobile phone, computer or GNSS receiver.
Described physical server is multiple stage workstation or distributed type assemblies.
Described virtual server is provided with multiple.
Compared with prior art, the present invention has the following advantages:
1, high-performance, present system not only adopts Linux+Nginx+MySQL+PHP service architecture, and have employed the server that " actual situation " combines, scientific algorithm part is separated with user interactions, give full play to the calculating usefulness of physical server, the request of energy fast processing user, avoids waiting as long for, greatly improves the performance of system service;
2, security, present system adopts " actual situation " mix server, the not direct user oriented of physical server, probability under attack reduces greatly, there is multiple virtual server as backup simultaneously, once the under attack and machine of delaying of main virtual server, can be switched to rapidly virtual servers of other backups thus implementation platform continues safe operation, the safety continuous of safeguards system runs and the privacy of user;
3, extensibility, virtual server can select suitable virtual server configuration according to number of users, configures as required, cost-saving;
4, controllability, for space-time in particular cases, the present invention artificially can add the TEC precision of random perturbation to appointed area in computing module beyond the clouds and control;
5, universality, the present invention can set up corresponding ionospheric model according to demand on physical server, match with extendible virtual server again and can serve region or Global Subscriber, be applicable to region, on a large scale so the ionized layer TEC in the whole world broadcast service;
6, cross-terminal, what user can obtain ionized layer TEC by the plurality of devices such as computer, panel computer, mobile phone, GNSS receiver broadcasts service.
Accompanying drawing explanation
Fig. 1 is the block schematic illustration of present system;
Fig. 2 is the logical schematic of the inventive method.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, the active broadcasting system of a kind of ionized layer TEC, it is characterized in that, comprise user terminal 1, virtual server 2 and physical server 3, described user terminal 1 is connected to each other with virtual server 2, described virtual server 2 is connected to each other with physical server 3, and described physical server 3 is set up ionospheric model.Described user terminal 1 is mobile phone, computer or GNSS receiver.Described physical server 3 is multiple stage workstation or distributed type assemblies.Described virtual server 2 is provided with multiple, and one of them is main virtual server, and remaining is standby virtual server, when main virtual server delays machine, is then switched to standby virtual server.
The present embodiment adopts Ubuntu12.04 as the operating system of present system server, adopt Nginx+MySQL+PHP website service framework, and have employed eight kinds of programming languages such as C++, Fortran, PHP, HTML, CSS, JavaScript, XML, XSL and complete present system, be respectively: the acquisition adopting HTML, CSS and JavaScript language completing user end-user interface and terminal geographic position and temporal information; The information adopting PHP language to realize user submits to sends virtual server to and result of calculation is fed back to user terminal; C Plus Plus is adopted to realize the logical process of virtual server and physical server master routine; Fortran is adopted to realize the linear calculating section of physical server ionospheric model and core; XML format is adopted to be the file layout that returns results using as application programming interface; Returning results of storing in xml format is converted to the user interface that HTML is presented in user terminal by employing XSL language.
As shown in Figure 2, the active broadcasting method of a kind of ionized layer TEC, is characterized in that, comprise the following steps:
Step 101, user passes through geographic position and the temporal information at User Interface or API transmitting terminal place on the subscriber terminal;
Step 102, the information that user submits to is waited for and received to virtual server;
Step 103, the information that user submits to is passed to physical server by virtual server;
Step 104, the position that virtual server transmits and temporal information are waited for and received to physical server;
Step 105, after physical server receives position and temporal information, calculates ionized layer TEC according to the ionospheric model preset and feeds back to virtual server;
Step 106, ionized layer TEC is turned back to user terminal by User Interface or API by virtual server, turns back to user terminal according to User Interface, then need first by XSL language, XML format to be converted to html format;
Step 107, user terminal receives ionized layer TEC, and is converted into Ionospheric delay correcting information.
Present system can support that internet, mobile Internet and API tri-kinds of channels obtain ionized layer TEC, is below respectively the concrete implementation step that employing three kinds of channels obtain ionized layer TEC:
A, interconnected network mode
101) by browser access system homepage http://iris.geodesy.cn;
102) in system homepage input time, latitude, these three parameters of longitude, as the time: 20131007200416, latitude: 39.4792, longitude: 120.7130;
103) click " acquisition ionized layer TEC " button, submit step 102 to) three parameters inputting;
104) virtual server receiving step 102) three parameters inputting, and they are passed to physical server;
105) physical server receiving step 104) three parameters transmitting of virtual server, and to calculate the value of ionized layer TEC according to ionospheric model be 8.29936TECu;
106) value of ionized layer TEC is fed back to virtual server by physical server;
107) virtual server user is submitted to time, longitude and latitude and ionized layer TEC value document in xml format output to the browser of user terminal;
108) XML document is formatted as HTML according to the XSL preset in advance and shows user by browser.
B, mobile interchange net mode
For mobile interchange net mode, the public platform interface of the micro-letter of mobile communication software that the present embodiment adopts one of internet integrated service provider maximum at present of China company of Tengxun to develop is developed.By the geographical location information that micro-letter interface user submits to, and then be submitted to high in the clouds and carry out calculating and ionized layer TEC being pushed to user.Concrete implementation step is as follows:
201) use first need add micro-letter account geodesy first;
202) add successfully and open communication window, click "+" ejection function menu;
203) " position " icon is selected, loading position information;
204) click transmission button, submit information to;
205) virtual server analyzing step 204) information submitted to is time, longitude, latitude;
206) virtual server receiving step 202) three parameters inputting, and they are passed to physical server;
207) physical server receiving step 204) three parameters transmitting of virtual server, and calculate the value of ionized layer TEC according to ionospheric model;
208) value of ionized layer TEC is fed back to virtual server by physical server;
209) virtual server user is submitted to time, longitude and latitude and ionized layer TEC the information such as value export;
210) Tengxun's micro-telecommunications services device receives the output information of virtual server and is fed back to micro-letter window interface.
C, API mode
301) use programming language to realize socket connection API address or use wget or curl to access API address, as http://iris.geodesy.cn/tec/? ut=20131007202949 & lat=39.4792 & lon=-84.7130, wherein ut, lat, lon represent UT time, latitude, longitude three parameters respectively;
302) read step 301 is realized with programming language) XML document that obtains, thus obtain ionized layer TEC value.
Satellite navigation and location-based service, for the whole world, remain a small new industry at present.The mapping application technology of development position-based information and cloud computing and service mode, both can meet the application needs that the cloud epoch are about to bring, and Surveying and Mapping Industry and public user also will be made to enjoy technical development and serve the income that model innovation brings.
Claims (4)
1. the active broadcasting method of the ionized layer TEC of position-based information, is characterized in that, realized by the system comprising user terminal, virtual server and physical server, described system is the system that " actual situation " combines, and described broadcasting method comprises the following steps:
(1) user passes through geographic position and the temporal information at User Interface or API transmitting terminal place on the subscriber terminal;
(2) information that user submits to is waited for and received to virtual server;
(3) information that user submits to is passed to physical server by virtual server;
(4) position that virtual server transmits and temporal information are waited for and received to physical server;
(5), after physical server receives position and temporal information, calculate ionized layer TEC according to the ionospheric model preset and feed back to virtual server;
(6) ionized layer TEC is turned back to user terminal by User Interface or API by virtual server;
(7) user terminal receives ionized layer TEC, and is converted into Ionospheric delay correcting information.
2. the active broadcasting method of ionized layer TEC of a kind of position-based information according to claim 1, is characterized in that, described user terminal is mobile phone, computer or GNSS receiver.
3. the active broadcasting method of ionized layer TEC of a kind of position-based information according to claim 1, is characterized in that, described physical server is multiple stage workstation or distributed type assemblies.
4. the active broadcasting method of ionized layer TEC of a kind of position-based information according to claim 1, it is characterized in that, described virtual server is provided with multiple.
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| CN102216922A (en) * | 2008-10-08 | 2011-10-12 | 卡沃有限公司 | Cloud computing lifecycle management for n-tier applications |
| CN102291673A (en) * | 2011-07-13 | 2011-12-21 | 同济大学 | Location information inquiry method based on base station positioning |
| CN102411749A (en) * | 2011-08-24 | 2012-04-11 | 厦门市鼎朔信息技术有限公司 | Virtual guiding system based on positioning information and network display terminal |
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| US6215441B1 (en) * | 1997-04-15 | 2001-04-10 | Snaptrack, Inc. | Satellite positioning reference system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102216922A (en) * | 2008-10-08 | 2011-10-12 | 卡沃有限公司 | Cloud computing lifecycle management for n-tier applications |
| CN102291673A (en) * | 2011-07-13 | 2011-12-21 | 同济大学 | Location information inquiry method based on base station positioning |
| CN102411749A (en) * | 2011-08-24 | 2012-04-11 | 厦门市鼎朔信息技术有限公司 | Virtual guiding system based on positioning information and network display terminal |
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