Low-orbit navigation constellation enhanced network RTK (real-time kinematic) method

A low-orbit constellation and global navigation satellite technology, applied in the field of navigation and positioning, can solve the problem of low positioning accuracy

Inactive Publication Date: 2019-06-28
WUHAN UNIV
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Problems solved by technology

[0005] The invention provides a network RTK method for low-orbit navigation constellation enhanceme

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specific Embodiment approach

[0133] Combine below Figure 1 to Figure 6 Introduce the specific embodiment of the present invention, specifically comprise the following steps:

[0134] Step 1, design the global navigation and positioning constellation and various low-orbit constellation schemes. Configure the key parameters of the constellation and judge the service performance of various constellations.

[0135] As a preference, the constellation design scheme described in step 1 is:

[0136]For the simulation of low-orbit constellations, in terms of the number of satellites, the present invention considers the situation of selecting 60, 96, 192 and 288 stars for analysis, wherein the scheme of 60 stars is adopted by the "Swan Goose" constellation of China Aerospace Science and Technology Corporation, 288 The 1-star solution was once selected by the US Teledesic (global satellite communication network) low-orbit constellation. For the cases of 96 and 192 stars, the numbers are 1 / 3 and 2 / 3 of 288 stars r...

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Abstract

The invention belongs to the technical field of navigation and positioning and discloses a low-orbit navigation constellation enhanced network RTK (real-time kinematic) technology. The low-orbit navigation constellation enhanced network RTK technology comprises the following steps: design of a global navigation and positioning constellation and multiple low-orbit constellation schemes, a low-orbitsatellite collecting orbit determination and inter-satellite link autonomous orbit determination method, design of a low-orbit satellite broadcast ephemeris and a high, medium and low-orbit satellitefusion processing unified mathematical model. The problem in the prior art that the network RTK method is low in positioning precision is solved, the baseline distance can be increased, the network density can be reduced, the cost can be reduced, the precision and the ambiguity fixing rate are increased, and the convergence time can be shortened. The sub-satellite point track coverage range of the low-orbit constellation is wide and even covers polar regions, the three-dimensional orbit errors of 60 and 192-star constellation are 46 cm and 18 cm correspondingly, the forecast precision is increased by about 30 percent compared with that of a klobuchar model, and the final positioning precision is at horizontal millimeter and height centimeter level.

Description

technical field [0001] The invention relates to the technical field of navigation and positioning, in particular to a network RTK method for low-orbit navigation constellation enhancement. Background technique [0002] A low-orbit satellite system generally refers to a large-scale satellite system composed of multiple satellites that can process real-time information, and the distribution of satellites is called a satellite constellation. Low-orbit satellites are mainly used for military target detection, and it is easy to obtain high-resolution images of targets by using low-orbit satellites. Low-orbit satellites are also used for mobile phone communications. The low orbital altitude of the satellites makes the transmission delay short and the path loss small. A communication system composed of multiple satellites can achieve true global coverage, and frequency reuse is more effective. Technologies such as cellular communication, multiple access, spot beam, and frequency ...

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Application Information

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IPC IPC(8): G01S19/44
Inventor 石莹覃楚仪王秋逸李若莹余琪黄昊
Owner WUHAN UNIV
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