Geoid-vertical line deviation correction method and system for GNSS-R specular reflection point

Abstract

The invention discloses a geoid-vertical line deviation correction method and system for a GNSS-R specular reflection point. The method comprises the steps of acquiring spatial position information ofnavigation satellites and a receiver; determining a specular reflection point on the reference ellipsoid according to the spatial position information of the navigation satellites and the receiver; introducing the elevation correction amount, iteratively correcting the specular reflection point on the reference ellipsoid to the geoid to obtain a specular reflection point on the geoid; calculatingthe spatial geometric relationship between the normal projection of the geoid and the reflection path, determining the vertical line deviation correction amount of the specular reflection point, anditeratively correcting the normal direction of the reflection path to the normal direction of the geoid, and carrying out iterative correction on the specular reflection point on the geoid to obtain afinal specular reflection point corrected by the vertical line deviation on the geoid. The geoid-vertical line deviation correction method and system improve the positioning accuracy of the specularreflection point and provide support for acquiring a marine gravity field with high spatial resolution and high precision.

Description

technical field [0001] The invention belongs to the intersecting technical fields of satellite altimetry, marine surveying and mapping, gravity and the like, and in particular relates to a geoid-perpendicular deviation correction method and system for GNSS-R mirror reflection points. Background technique [0002] GNSS-R (Global Navigation Satellite System-Reflection Technology), as a new microwave remote sensing method, has the advantages of abundant signal sources, low cost, low power consumption, and wide application, and can obtain global sea surface height (SSH) with high temporal and spatial resolution. , sea surface wind field, ocean salinity, sea ice and other ocean dynamics and environmental parameters. [0003] In 1993, Martin Neria first proposed the feasibility of using GPS reflection signals for altimetry; in 1994, Auber first detected GNSS-R signals in the receiver of the aircraft test in July 1991; in 1996, NASA first proposed GNSS-R It can be applied to sea s...

AI Technical Summary

Problems solved by technology

The existing mirror reflection point positioning methods all use the standard sphere or the CGCS2000 ellipsoid as the reflection reference surface, and do not consider the positioning error caused by the elevation difference between the actual sea surface and the CGCS2000 ellipsoid and the vertical line deviation, and this difference cannot be ignored. low precision problem

Images