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Method for supporting medium and long distance pseudorange differential positioning

A pseudo-range differential, medium and long-range technology, applied in the field of satellite navigation and positioning, can solve problems such as the influence of ionospheric delay error, and achieve the effect of reducing observation noise

Active Publication Date: 2021-04-30
NANJING NORTH OPTICAL ELECTRONICS
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for supporting medium and long-distance pseudo-range differential positioning, which overcomes the traditional pseudo-range differential positioning method when dealing with medium and long baselines of 50km-200km problems that are seriously affected by ionospheric delay errors

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  • Method for supporting medium and long distance pseudorange differential positioning
  • Method for supporting medium and long distance pseudorange differential positioning
  • Method for supporting medium and long distance pseudorange differential positioning

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] to combine figure 1 , a method for supporting medium and long-distance pseudo-range differential positioning, the steps are as follows:

[0018] Step 1. Set up a dual-frequency receiver on the reference point for receiving broadcast ephemeris, dual-frequency carrier phase and dual-frequency pseudorange;

[0019] Step 2. Calculate the three-dimensional position of the satellite in the current epoch (X S ,Y S ,Z S ) and the satellite clock error Δt, and calculate the geometric distance from the satellite to the reference station

[0020] Step 3. Obtain the dual-frequency pseudo-range observation value P according to the dual-frequency pseudo-range 1 and P 2 , using the dual-frequency pseudorange observation P 1 and P 2 Construct the ionosphere-free combination equation to generate the ionosphere-free combination pseudo-range observation value P...

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Abstract

The invention discloses a method for supporting medium and long distance pseudorange differential positioning, which comprises the following steps of: when calculating a pseudorange differential correction number, constructing an ionosphere-free combination by using a double-frequency GNSS signal so as to eliminate an ionosphere delay error term and expand the service range of the pseudorange differential correction number from 50km to 200km, and meanwhile, smoothing a pseudorange by using a carrier phase, smoothing the ionosphere-free combined pseudo-range observation value by using a low-noise carrier phase observation value, so that the observation noise of the ionosphere-free combined pseudo-range observation value is reduced, a low-noise and high-precision differential correction number can be generated, and medium and long distance pseudo-range differential positioning is facilitated.

Description

technical field [0001] The invention belongs to satellite navigation and positioning technology, in particular to a method for supporting medium and long distance pseudo-range differential positioning. Background technique [0002] In satellite positioning, when the pseudo-range observation value is used for single-point positioning, the real-time positioning accuracy is about 10 meters. Pseudo-range differential positioning technology refers to the use of one or more reference stations with known coordinates in a certain area to receive the three-dimensional position of the satellite in real time and independently calculate the correction number of its own pseudo-range difference, and then broadcast it to the rover through the data transmission link for pseudo-range difference Positioning, to achieve meter-level or even sub-meter-level positioning accuracy of the rover. However, the traditional single-station pseudo-range differential technology has a short range, and the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/29G01S19/41G01S19/43
CPCG01S19/24G01S19/29G01S19/41G01S19/43Y02A90/10
Inventor 徐学永周叶夏羽徐波吴波王琛琛惠孟堂汤深权蒋虎施金金王伟李哲白天阳张浩山金俭俭姜秋晨
Owner NANJING NORTH OPTICAL ELECTRONICS
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