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GNSS-R sea surface height measurement precision and along-track spatial resolution reconstruction method and system

A spatial resolution, along-track technology, applied in the cross field, can solve the problems of unmanned iGNSS-R comprehensive analysis altimetry accuracy and accuracy

Pending Publication Date: 2022-02-11
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

However, there is no comprehensive analysis of airborne iGNSS-R comprehensive analysis of altimetry precision and accuracy and along-track spatial resolution

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  • GNSS-R sea surface height measurement precision and along-track spatial resolution reconstruction method and system
  • GNSS-R sea surface height measurement precision and along-track spatial resolution reconstruction method and system
  • GNSS-R sea surface height measurement precision and along-track spatial resolution reconstruction method and system

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Embodiment Construction

[0065] 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.

[0066] Accuracy and along-track spatial resolution are key parameters to characterize the high performance of iGNSS-R (Interferometric Global Navigation Satellite Systems Reflectometry) sea surface measurement, and the two are closely related through signal processing time. If a higher measurement accuracy is obtained in the observation area, a longer signal processing time is required, and part of the spatial resolution along the track will be lost. On the contrary, obtaining higher spatial resolution along the track requires more intensive time sampling, which ultimately leads to unsatisfactory measurement accuracy. Taking the airborne iGNSS-R measured data as an example, the present invention studies and analyzes the relationship be...

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Abstract

The invention discloses a GNSS-R sea surface height measurement precision and along-track spatial resolution reconstruction method and system. The method comprises steps that original data is processed, and a complex waveform is obtained; the complex waveform is processed to obtain a power waveform, and resolving is carried out to obtain the average height measurement accuracy corresponding to the N mirror surface points; the mirror point time delay is corrected, a vertical distance from the sub-satellite point sea surface of the receiver to the reference ellipsoid surface is obtained through inversion, and average height measurement accuracy corresponding to the N mirror points is obtained through calculation; average height measurement precision and average height measurement accuracy obtained at different signal processing times are obtained; reconstruction of GNSS-R sea surface height measurement precision and along-track spatial resolution is realized by combining the relationship between the along-track spatial resolution and signal processing time. According to the method, the relation between the airborne iGNSS-R height measurement precision and the along-track spatial resolution is comprehensively analyzed from two aspects of height measurement precision and accuracy, and a reference is provided for balance consideration of relevant parameters of a satellite-borne iGNSS-R height measurement task in the future.

Description

technical field [0001] The invention belongs to the interdisciplinary technical fields of satellite altimetry and marine surveying and mapping, and in particular relates to a GNSS-R sea surface surveying high-precision and along-track spatial resolution reconstruction method and system. Background technique [0002] Global Navigation Satellite System Reflectometer (GNSS-R technology) can use GNSS reflected signals to measure a series of physical parameters on the earth's surface, including sea surface wind speed, sea surface height and soil moisture. Among them, GNSS-R sea surface altimetry is a new type of bistatic radar remote sensing technology. By measuring the path delay between the direct signal and the reflected signal, the height of the earth's reflective surface relative to the reference ellipsoid can be obtained. Since Martin-Neira et al. first proposed the concept of GNSS-R sea surface altimetry in 1993, this technology has been verified on various platforms such ...

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Application Information

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IPC IPC(8): G01S19/14G01S19/23G01S19/37
CPCG01S19/14G01S19/23G01S19/37
Inventor 郑伟吴凡刘宗强
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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