Distributed Beidou position service center RTK product positioning method and positioning device

A location service and positioning method technology, applied in the field of satellite positioning, can solve problems affecting the accuracy of network RTK positioning, and achieve the effects of improving user experience, saving costs, and reducing transmission distances

Active Publication Date: 2022-04-15
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In network RTK, in order for RTK to obtain a fixed solution continuously and quickly, the RTK mobile station must continuously, reliably and quickly receive the data link signal sent by the reference station, so the choice of data link transmission frequency and transmission mode will affect the network A key factor of RTK performance. In addition, the ionospheric delay in the area where the mobile station is located is also one of the main errors affecting the positioning accuracy of the network RTK. The empirical ionospheric correction model cannot well adapt to the ionospheric delay correction in each area.

Method used

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  • Distributed Beidou position service center RTK product positioning method and positioning device
  • Distributed Beidou position service center RTK product positioning method and positioning device
  • Distributed Beidou position service center RTK product positioning method and positioning device

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Embodiment 1

[0066] See figure 1 and figure 2 , figure 1 It is a schematic flow diagram of a distributed Beidou location service center RTK product positioning method provided by an embodiment of the present invention, figure 2 A schematic flow chart of ionospheric delay correction provided by an embodiment of the present invention.

[0067] The satellite signal is a kind of electromagnetic wave, and the phase velocity propagating in the ionosphere (the propagation velocity of the phase of the satellite signal of a single frequency) V p and the phase refractive index n in the ionosphere P There is the following relationship between:

[0068]

[0069] Among them, c is the speed of light in vacuum, n P is the phase refractive index in the ionosphere.

[0070] while the phase refractive index n P Can be expressed as:

[0071] no p =1-K 1 Nef -2 ±K 2 Ne(H 0 cosθ)f -3 -K 3 Ne 3 f -4 (2)

[0072] In formula (2),

[0073]

[0074] In formulas (2) and (3), Ne is the ele...

Embodiment 2

[0167] See Figure 5 , Figure 5 A structural schematic diagram of a distributed Beidou location service center RTK product positioning device provided by an embodiment of the present invention, the positioning device includes:

[0168] The data processing module is used to calculate the total electron content in the zenith direction of each piercing point according to the observation data.

[0169] A model building module, connected to the data processing module, used to establish a quasi-real-time ionospheric correction model in the low-density network area according to the total electron content in the zenith direction on the L×m×n puncture points, and calculate the model coefficient.

[0170] The parameter prediction module is connected with the model building module, and is used to predict the ionospheric correction parameters of the target period after the observation period according to the quasi-real-time ionospheric correction model of the low-density network area a...

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Abstract

The invention relates to a distributed Beidou position service center RTK product positioning method and device, and the method comprises the steps: selecting an observation time period, carrying out the observation of n satellites from m monitoring stations under L observation epochs in the observation time period, and obtaining the observation data of L * m * n puncture points; calculating the total electron content of each puncture point in the zenith direction according to the observation data; according to the total electron content in the zenith direction on the L * m * n puncture points, establishing a low-density network region quasi-real-time ionosphere correction model, and calculating a model coefficient; according to the ionosphere correction model and the model coefficient, predicting ionosphere correction parameters of a target time period after the observation time period; and in combination with the ionosphere correction parameters, performing real-time positioning by using a real-time carrier phase difference positioning technology to obtain a positioning result. According to the positioning method, the regional ionosphere correction model is established through the ground observation network, the transmission distance between the control center and the base station and the transmission distance between the control center and the moving station are reduced, short-distance transmission is achieved, and meanwhile the real-time performance of RTK is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of satellite positioning, and in particular relates to a positioning method and a positioning device for RTK products of a distributed Beidou location service center. Background technique [0002] The Beidou location service center is a Beidou comprehensive service platform that provides high-precision location information services for the entire industry and region based on the Beidou satellite navigation technology and cloud computing technology. Utilizing the open and shared system architecture of cloud technology, the global navigation satellite system (Global Navigation Satellite System, GNSS), geographic information system (Geographic Information System, GIS), remote sensing technology (Remote Sensing, RS) and other related location and time services Infrastructure, data resources, and service platforms are integrated into one system to provide comprehensive services based on location information for g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/44
CPCY02A90/10
Inventor 成芳沈朋礼肖厦卢晓春李艳红刘东亮李晓婉
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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