CN101509970A - Network differential correcting information generating and publishing method - Google Patents

Abstract

The invention discloses a method for generating and issuing network difference correcting messages, belonging to the technical field of GPS difference position in network transmission. The method comprises the following steps: network carrier phase difference correcting messages and network code difference correcting messages are generated and issued, by taking a continuous running reference station service system as a platform, all reference stations send relevant data to a control center by a data communication network, then the control center gathers the messages of the continuous running reference stations and establishes a relevant spatial information model, a mobile user uploads the self outline coordinates to the control center, and the control center estimates and generates corresponding network difference correcting messages and sends the messages by networks according to an interpolation calculating model. The method enlarges effective service range of a baseline network greatly and can realize centimeter and real-time dynamic positioning with uniform precision and high reliability within the area coverage.

Description

A kind of generation of network differential correcting information and dissemination method

Technical field

The difference information that the present invention relates to positioning service system generates and issue, relates in particular to a kind of generation and dissemination method of network differential correcting information, belongs to GPS differential position field in the Network Transmission.

Background technology

Be accompanied by wireless telecommunications and development of internet technology, and move base station net (Continuous OperationalReference System continuously, CORS) extensive foundation in the world, make GPS middle and long distance high precision real-time dynamic positioning become possibility, GPS network differential location technology is just arisen at the historic moment like this.

The conventional differential position of GPS mainly comprises carrier phase difference (RTK) and sign indicating number difference (RTD) technology at present, the usage space of GPS has greatly been expanded in the appearance of this technology, make the GPS location technology be widely used in geodetic surveying and other field relevant with positional information, but conventional GPS differential technique has obvious weak point: along with the increase of base length, the correlativity of troposphere and ionosphere equal error weakens even disappears, the systematic error residual error increases rapidly, causes bearing accuracy to descend; Need set up the base station when using in addition, cause the application process complexity, require the higher and cost burden weight of user's professional skill.

Summary of the invention

The present invention is for improving bearing accuracy, expanding generation and dissemination method that effective service range proposes a kind of network differential correcting information.

A kind of generation of network differential correcting information and dissemination method are platform with the reference station service system of continuous operation, comprise the generation and the issue of following two kinds of differential correcting informations:

(1) generation of network carriers phase difference correcting information and issue: each CORS sends to control center with observation data by data communication network, control center gathers each CORS observation information, utilize network parameter to set up the space correlation error model, the mobile subscriber uploads self rough coordinates to control center, control center selects main reference station and estimates space correlation error between rover station and main reference station according to the interpolation computation model, generate network carriers phase difference correcting information in conjunction with main reference station observed reading then, send by network at last, wherein: correlated error comprises atmosphere errors, orbit error, multipath effect, observation noise; The correlated error model comprises ionospheric error computation model, tropospheric error computation model, the orbit error computation model, and the multipath error weakens model; The interpolation computation model comprises ionospheric error interpolation computation model and troposphere interpolation computation model;

(2) generation of network code differential correcting information and issue: each CORS is according to observation information and self accurate WGS84 coordinate generated code correcting information, and issue control center by data communication network, control center gathers each CORS sign indicating number correcting information and sets up network ISN correcting information model, the user uploads self rough coordinates to control center, control center calculates the sign indicating number correcting information that the mobile subscriber locates by interpolation model, sends by network at last.

The inventive method is by the long-time observation to a plurality of CORSs, set up the correlated error model between reference station, accurately estimate the movement station positioning error, and provide real-time correcting information for the movement station user by the modern communications means, the user utilizes above-mentioned information to weaken the space correlation error, thereby expanded effective service range of baseline network greatly, realized centimetre-sized, uniform precision, high reliability, real-time dynamic positioning in the regional extent.

Description of drawings

Fig. 1 is a realization system framework synoptic diagram of the present invention.

Fig. 2 is the inventive method process flow diagram, and wherein: (a) being the generation issue process flow diagram of network carriers phase difference correcting information, (b) is the generation issue process flow diagram of network code differential correcting information.

Embodiment

In conjunction with illustrated in figures 1 and 2, a kind of generation of network differential correcting information and dissemination method are platform with the reference station service system of continuous operation, comprise the generation and the issue of following two kinds of differential correcting informations:

A. the generation of network carriers phase difference correcting information and issue:

(1) each CORS is issued control center with observation data by data communication network;

(2) control center sets up the space correlation error model according to each CORS observation information and network parameter:

The space correlation error comprises atmosphere errors, orbit error, and multipath effect, observation noise are each control information component of refining, and adopts error separating and classification model construction method, to all kinds of control information classification extractions and by the Model Calculation of refining; Set up ionospheric error computation model, tropospheric error computation model, orbit error computation model, multipath error weakening model for this reason respectively, realized that each error component high precision corrects;

(3) select main reference station:

The mobile subscriber sends self rough coordinates (NMEA form) to data processing and control center, and main reference station is selected according to mobile subscriber's rough coordinates by control center;

(4) according to the space correlation error between interpolation computation model estimation rover station and main reference station:

Space correlation error between rover station and main reference station is calculated by interpolation model by space correlation error between reference station, is mainly the atmosphere errors interpolation and calculates, and is consistent for making interpolate value and actual value, selects for use low order surface fitting method to carry out interpolation; According to atmosphere errors component own characteristic, set up ionospheric error interpolation computation model and troposphere interpolation computation model respectively, realized accurately obtaining of atmosphere errors interpolate value, provide safeguard for generating high-accuracy network carrier phase difference correcting information;

(5) utilize the observed reading of the space correlation sum of errors master reference station between rover station and main reference station to set up network carriers phase difference correcting information:

The CORS that control center selects participation to resolve according to the rough coordinates of mobile subscriber in network, automatically select network baseline to constitute network and resolve the unit, and will resolve the main reference station of selection in the unit, after the space correlation error that obtains by Model Calculation between rover station and main reference station, in conjunction with main reference station observed reading, control center can generate carrier phase difference correcting information according to network carriers phase difference correction model, sends by network at last, realizes the RTK location.

The network carriers phase difference correcting information robotization generation model that resolves the unit Network Based, control center generates high-precision network carriers phase difference correcting information according to this model;

B. the generation of network code differential correcting information and issue:

(1) the sign indicating number correcting information extracts:

Each CORS is according to observation information and self accurate WGS84 coordinate generated code correcting information;

(2) the sign indicating number correcting information gathers:

Each CORS will be gone up the sign indicating number correcting information that the step generates and issue control center by data communication network, and control center gathers and sets up network ISN correcting information model;

(3) user transmits rough coordinates:

The mobile subscriber inserts by communication network, sends self rough coordinates (NMEA form) to data processing and control center;

(4) interpolation is calculated mobile subscriber's sign indicating number correcting information:

According to the rough coordinates that the network ISN correcting information model of having set up and mobile subscriber upload, control center calculates the sign indicating number correcting information at user place by interpolation model;

(5) the sign indicating number correcting information sends:

Control center sends the sign indicating number correcting information by communication network to rover station, and rover station can be realized the RTD location.

Claims (1)

1, a kind of generation of network differential correcting information and dissemination method are platform with the reference station service system of continuous operation, it is characterized in that comprising the generation and the issue of network carriers phase difference correcting information and network code differential correcting information:

(1) generation of network carriers phase difference correcting information and issue: each CORS sends to control center with observation data by data communication network, control center gathers each CORS observation information, utilize network parameter to set up the space correlation error model, the mobile subscriber uploads self rough coordinates to control center, control center selects main reference station and estimates space correlation error between rover station and main reference station according to the interpolation computation model, generate network carriers phase difference correcting information in conjunction with main reference station observed reading then, send by network at last, wherein: correlated error comprises atmosphere errors, orbit error, multipath effect, observation noise; The correlated error model comprises ionospheric error computation model, tropospheric error computation model, the orbit error computation model, and the multipath error weakens model; The interpolation computation model comprises ionospheric error interpolation computation model and troposphere interpolation computation model;

(2) generation of network code differential correcting information and issue: each CORS is according to observation information and self accurate WGS84 coordinate generated code correcting information, and issue control center by data communication network, control center gathers each CORS sign indicating number correcting information and sets up network ISN correcting information model, the user uploads self rough coordinates to control center, control center calculates the sign indicating number correcting information that the mobile subscriber locates by interpolation model, sends by network at last.

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