CN102540225A - Programmable smart mobile phone based CORS (continuous operational reference system) positioning implementing method - Google Patents

Abstract

The invention discloses a programmable smart mobile phone based CORS positioning implementing method which comprises the following steps: (1) initializing a system; (2) acquiring positioning data; (3) acquiring CORS center correction numbers; (4) extracting the latitude and longitude information and the correction numbers and transmitting to a calculating module and a precision evaluating module; (5) obtaining the corrected coordinate and elevation and transmitting to a coordinate converting module and the precision evaluating module; (6) obtaining the final coordinate and elevation; (7) analyzing the obtained coordinate and elevation precision by using the precision evaluating module to obtain precision information; and (8) displaying. Due to the correction number of the CORS, the high-precision nano-scale positioning of the smart mobile phone can be truly realized.

Description

Implementation method based on the CORS of programmable, intelligent mobile phone location

Technical field

The invention belongs to the Real-time and Dynamic pseudo range difference location technology in the GPS applied technical field; Mainly comprise continuous operation satnav integrated service system (Continuous Operational Reference System; CORS) technology; The real-time positioning real time differential resolves technology, smart mobile phone secondary exploitation technology etc.Especially based on the implementation method of the CORS of programmable, intelligent mobile phone location.

Background technology

CORS is the important ingredient of spatial data infrastructure, builds up in the many cities of China and puts into operation, has covered the whole nation in some country.Operation satnav integrated service system is through in certain regional extent continuously; Set up some nonvolatil continuous operation position location satellite DRSs (abbreviation reference station); Utilize modern communication technology to accept each reference station satellite data and handle, the system of various high precision space orientation services and diversification information service is provided for the user.The technical foundation of operation satnav integrated service system is the GPS (GPS) and the communication technology continuously, is the product of satellite positioning tech development, is satellite positioning tech Application Expansion and in-depth.

Mobile Phone Locating is meant the positional information (latitude and longitude coordinates) of obtaining cell phone or terminal user through specific location technology, on electronic chart, marks the technology or the service of the position of the object that is positioned.Location technology has two kinds, a kind of location (5-10 rice) that is based on GPS, a kind of location (30 meters) that is based on the base station of moving operation network.Based on the locator meams of GPS is to utilize GPS locating module on the mobile phone that oneself position signalling is sent to the backstage, location to realize Mobile Phone Locating.The location, base station then is to utilize the base station that the measuring and calculating distance of the distance of mobile phone is confirmed mobile phone location.The latter does not need mobile phone to have the GPS station-keeping ability, but precision largely depends on the distribution of base station and the size of coverage, has the time error can be above one kilometer.The former bearing accuracy is higher.

RFDC is a kind of communication mode through the radiowave data information.It is on the basis of wired data communication, to grow up, and can realize the data communication under the mobile status.Existing wireless communication technology mainly contains GPRS, CDMA, GSM etc.

Through the secondary development to mobile phone, the realization mobile phone can directly be accepted the original locator data (pseudorange) of cellphone GPS module serial ports, accepts the correction at CORS center, and uses certain algorithm to correct, and finally obtains the high-precision location data.

Summary of the invention

The deficiency that the present invention is directed to prior art provides a kind of implementation method of locating based on the CORS of programmable, intelligent mobile phone.

A kind of implementation method of locating based on the CORS of programmable, intelligent mobile phone may further comprise the steps:

1) system initialization; Select the coordinate system and the elevation system of positioning result output by the user, such as the coordinate of latitude and longitude information, Beijing 54 coordinate system coordinates and elevation or Chongqing coordinate system and elevation etc.;

2) obtain locator data; The GPS module that mobile terminal of mobile telephone carries is gathered locator data, and data mainly contain latitude and longitude information, geodetic height, and height anomaly, satellite state information and positioning states, and send parsing module to; What its data owner will be followed is the NMEA-0183 agreement;

3) obtain CORS center correction; Mobile terminal of mobile telephone passes through wireless network mode Connection Service devices such as GPRS/CDMA, and obtains the correction data of CORS system through communication module; Be transferred to parsing module then;

4) parsing module is according to NMEA-0183 with the RTCM data layout extracts latitude and longitude information and correction is transferred to computing module and accuracy assessment module;

5) computing module is handled data through weighted mean algorithm model or linear interpolation algorithm model or low order surface model, coordinate and elevation after obtaining correcting, and be transferred to coordinate transferring and accuracy assessment module to coordinate and the elevation after correcting;

6) coordinate transferring is according to the demand information of user input in the first step, and coordinate and elevation after the correction that step 5) is obtained carry out coordinate conversion, obtain final coordinate and elevation; Be transferred to accuracy assessment module and display module to coordinate and elevation then;

7) the accuracy assessment module is according to step 2) coordinate transformation method that adopted of the computation model that adopted of gained locator data, step 5) and step 6); Analytical procedure 6) precision of the coordinate of gained and elevation; Obtain precision information, and precision information is transferred to display module;

8) the display module step display 6) coordinate of gained and the precision information of elevation and step 7) gained.

Compare prior art, the present invention has following beneficial effect:

1, the Mobile Phone Locating precision is higher.Existing mobile terminal of mobile telephone all is to realize Mobile Phone Locating through assistant GPS, integrated GPS, Wi-Fi network or cell phone network, and its bearing accuracy can reach 5-10 rice at most, even lower.The present invention can realize the positioning result of decimeter grade, really realizes the hi-Fix of mobile phone.

2, mobile phone application is more extensive.The location of existing mobile phone is mainly reflected in mobile phone gross navigation aspect because the influence of its bearing accuracy makes its range of application narrow at present, and other application is less.The present invention makes mobile phone can be used for precise navigation and location, general engineering survey, urban pipeline investigation etc.

3, realize hi-Fix, need not to change mobile phone hardware, can directly realize through the mobile phone secondary development.

Description of drawings

Fig. 1 is the inventive method key diagram;

Fig. 2 is the inventive method data flow figure.

Embodiment

Below in conjunction with specific embodiment, the present invention is elaborated.

Embodiment 1

With reference to figure 1, be system works flow process figure of the present invention, be the method that obtains the hi-Fix result through the correction data solver of mobile phone utilization CORS system.With reference to figure 2, be the data flow figure of system of the present invention.

Step is following:

1) system initialization.Select the coordinate system and the elevation system of positioning result output by the user, such as the coordinate of latitude and longitude information, Beijing 54 coordinate system coordinates and elevation or Chongqing coordinate system and elevation etc.;

2) locator data obtains.The GPS module that mobile terminal of mobile telephone carries is gathered locator data, and data mainly contain latitude and longitude information, geodetic height, and height anomaly, satellite state information and positioning states, and send parsing module to.What its data owner will be followed is the NMEA-0183 agreement.

Have the GPS module to existing portable terminal itself, and smart mobile phone all provides secondary development.So this explanation adopts a kind of Carbide C++ that develops software of symbian system to realize the extraction of cellphone GPS module raw data.

Existing C arbide C++ can realize the collection of data.It is an ActiveX control of simplifying serial communication programming under the windows, for application program provides the method through serial line interface sending and receiving data.During communication, outer handset software sends command frame to the GPSOEM plate, and request the other side beams back Frame.Comprising effective data length, initial value etc. in this Frame comes through the order biography.The Frame that the GPSOEM plate of frame of receiving orders send to specify requires is to the other side.

3) CORS center correction obtains.Mobile terminal of mobile telephone passes through wireless network mode Connection Service devices such as GPRS/CDMA, and obtains the correction data (mainly being RTCM V2.0/2.1 pseudo range difference update information) of CORS system through communication module.Be transferred to parsing module then.

4) parsing module is according to NMEA-0183 with the RTCM data layout extracts latitude and longitude information and correction is transferred to computing module and accuracy assessment module.

5) computing module is handled data through weighted mean algorithm model or linear interpolation algorithm model or low order surface model, coordinate and elevation after obtaining correcting, and be transferred to coordinate transferring and accuracy assessment module to coordinate and the elevation after correcting.

Method of weighted mean is with the weighted mean value of each the base station correction correction as the user.The choosing method of power, commonly used also is to weigh method simply the most surely, is to leave the principle that the distance of base station is inversely proportional to according to the power of correction and user, thereby makes this method take the influence of position to differential correcting into account.

Linear interpolation can independently be selected the primary standard station, therefore uses more flexible.Taken the influence of change in location to differential correcting in the model into account, user's the bearing accuracy difference of more singly standing is significantly improved, but when the user be positioned at the polygonal region that constitutes by base station in addition the time effect just not ideal.

For low order surface model method, the number of base station depends on the variable number and the number of times of low order surface model in the LAN, uses areal model usually, and minimum number is 4.This method has not only been considered the space correlation error, but also has considered non-space correlated error such as multipath effect etc.

6) coordinate transferring is according to the demand information of user input in the first step, and coordinate and elevation after the correction that step (5) is obtained carry out coordinate conversion, obtain final coordinate and elevation.Be transferred to accuracy assessment module and display module to coordinate and elevation then.

The locator data of the GPS module collection that mobile terminal of mobile telephone carries is under the WGS84 coordinate system; And the coordinate system that the user often uses is the coordinate system in Beijing 54 coordinate systems, Xi'an 80 coordinate systems or area, exists the relation of rotation and translation and ratio between different coordinate systems.The key of coordinate conversion is the coordinate transformation parameter of obtaining between different coordinates, and existing main method has seven parametric methods and three parametric methods.

7) coordinate transformation method that adopted of the computation model that adopted according to step (2) gained locator data, step (5) of accuracy assessment module and step (6); The coordinate of analytical procedure (6) gained and the precision of elevation; Obtain precision information, and precision information is transferred to display module.

Influence the final bearing accuracy of native system and depend on several aspects.The one, the bearing accuracy of mobile terminal of mobile telephone GPS itself.The 2nd, the computation model that computing module adopted.The 3rd, coordinate conversion error is transformed into the projection error that required coordinate system causes by WGS84, distortion inaccuracy etc., and error, middle relatively error were carried out accuracy assessment to positioning result during the accuracy assessment module adopted according to above-mentioned several respects factor.

8) precision information of the coordinate of display module step display (6) gained and elevation and step (7) gained.

Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of accompanying claims of the present invention according to above-mentioned explanation.

Claims (1)

1. the implementation method based on the CORS location of programmable, intelligent mobile phone is characterized in that, may further comprise the steps:

1) system initialization; Select the coordinate system and the elevation system of positioning result output by the user, such as the coordinate of latitude and longitude information, Beijing 54 coordinate system coordinates and elevation or Chongqing coordinate system and elevation etc.;

2) obtain locator data; The GPS module that mobile terminal of mobile telephone carries is gathered locator data, and data mainly contain latitude and longitude information, geodetic height, and height anomaly, satellite state information and positioning states, and send parsing module to; What its data owner will be followed is the NMEA-0183 agreement;

3) obtain CORS center correction; Mobile terminal of mobile telephone passes through wireless network mode Connection Service devices such as GPRS/CDMA, and obtains the correction data of CORS system through communication module; Be transferred to parsing module then;

4) parsing module is according to NMEA-0183 with the RTCM data layout extracts latitude and longitude information and correction is transferred to computing module and accuracy assessment module;

5) computing module is handled data through weighted mean algorithm model or linear interpolation algorithm model or low order surface model, coordinate and elevation after obtaining correcting, and be transferred to coordinate transferring and accuracy assessment module to coordinate and the elevation after correcting;

6) coordinate transferring is according to the demand information of user input in the first step, and coordinate and elevation after the correction that step 5) is obtained carry out coordinate conversion, obtain final coordinate and elevation; Be transferred to accuracy assessment module and display module to coordinate and elevation then;

7) the accuracy assessment module is according to step 2) coordinate transformation method that adopted of the computation model that adopted of gained locator data, step 5) and step 6); Analytical procedure 6) precision of the coordinate of gained and elevation; Obtain precision information, and precision information is transferred to display module;

8) the display module step display 6) coordinate of gained and the precision information of elevation and step 7) gained.

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