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Space-borne gnss-r mirror reflection point ocean tide correction positioning method and system

A specular reflection and positioning method technology, which is applied in the cross field, can solve the problems of not considering the difference between the ellipsoidal surface and the instantaneous sea surface elevation, and the large positioning error of the specular reflection point, so as to reduce the positioning error and improve the positioning accuracy.

Active Publication Date: 2021-09-07
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

The signal reflection surface of GNSS-R sea surface altimetry is the instantaneous sea surface, but the reflection reference surface closest to the actual sea surface selected by the current mirror reflection point geometric positioning method is the earth ellipsoid, and the elevation between the ellipsoid and the instantaneous sea surface is not considered Difference—Sea Surface Height (SSH), which leads to a large error in the positioning of specular reflection points

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  • Space-borne gnss-r mirror reflection point ocean tide correction positioning method and system
  • Space-borne gnss-r mirror reflection point ocean tide correction positioning method and system
  • Space-borne gnss-r mirror reflection point ocean tide correction positioning method and system

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Embodiment Construction

[0060] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments disclosed in the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0061] like figure 1 , in this embodiment, the spaceborne GNSS-R specular reflection point ocean tide correction positioning method includes:

[0062] Step 101, acquiring spatial position information of navigation satellites and receivers.

[0063] Step 102: Determine the specular reflection point S on the reference ellipsoid according to the acquired spatial position information of the navigation satellite and the receiver.

[0064] In this example, if figure 2 and image 3 , according to the acquired spatial position information of the navigation satellite and the receiver, the position vectors of the navigation satellite T, the receiver R, and the mirror reflection point S on the reference ellipsoid can be expressed as: and ...

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Abstract

The invention discloses a method and a system for correcting and positioning the sea tide of a satellite-borne GNSS-R mirror reflection point. The method includes: acquiring the spatial position information of the navigation satellite and the receiver; according to the acquired spatial position information of the navigation satellite and the receiver, Determine the specular reflection point S on the reference ellipsoid; obtain the static elevation correction amount and the time-varying elevation correction amount; Perform static correction and time-varying correction on S to obtain the specular reflection point S' on the ocean tidal surface; perform normal correction on the specular reflection point S' on the ocean tidal surface to obtain the specular reflection on the ocean tidal surface The position S" of the point S' on the normal vertical plane of the ocean tidal surface. The present invention improves the positioning accuracy of the spaceborne GNSS-R specular reflection point on the sea surface.

Description

technical field [0001] The invention belongs to the interdisciplinary technical fields of satellite altimetry, ocean gravity, and ocean tides, and in particular relates to a method and system for correcting and positioning ocean tides of satellite-borne GNSS-R mirror reflection points. Background technique [0002] Global navigation satellite signal reflection technology (GNSS-R) is a new generation of sea surface altimetry technology. Its principle is to use the distance difference between the GNSS sea surface reflection signal and the direct signal to reach the receiver to achieve altimetry. Compared with traditional satellite altimeters, GNSS-R altimetry has the advantages of rich signal sources, low payload cost, all-weather, all-time, and low power consumption. Based on multi-channel receivers, multiple sea surfaces can be obtained at the same time Reflected signals, combined with a network of multiple GNSS-R satellites, can achieve high spatial resolution global sea su...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/42G01S19/40
CPCG01S19/40G01S19/42
Inventor 郑伟吴凡李钊伟
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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