GNSS-R technology-based river flow velocity measurement method and system

A technology for flow velocity measurement and rivers, applied in the field of remote sensing, can solve problems such as research is still blank, and achieve the effect of simple and fast algorithm, high-precision measurement, and wide application range

Active Publication Date: 2015-08-26
NAT SPACE SCI CENT CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] It is worth noting that although GNSS-R technology has carried out a lot of research in oceans, lakes, land and ice and snow areas, the research on rivers, especially on river velocity, is still blank

Method used

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  • GNSS-R technology-based river flow velocity measurement method and system
  • GNSS-R technology-based river flow velocity measurement method and system
  • GNSS-R technology-based river flow velocity measurement method and system

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Embodiment Construction

[0050] The present invention will be further described now in conjunction with accompanying drawing.

[0051] figure 1 It is a schematic diagram of the application scenario of measuring the river velocity. It can be seen from the figure that the signal transmitted by the GNSS satellite is controlled by a receiver carrier running above the river (such as figure 1 The receiver in the aircraft) receives, to realize the method of the present invention, the receiver needs to collect two types of signals: direct signal and reflected signal. The direct signal refers to the signal of the visible GNSS satellite that can be received directly; the reflected signal refers to the signal received after the GNSS signal is reflected by a reflecting surface (land surface or water surface). The two types of signals are respectively received by two antennas, and the antenna receiving the direct signal is called a direct antenna, and the antenna receiving the reflected signal is called a reflect...

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Abstract

The invention relates to a GNSS-R technology-based river flow velocity measurement method. The method at least comprises the following steps that: down-conversion and sampling are performed on received direct signals and reflected signals; the received direct signals are processed, so that the tracking frequency, pseudo-range and carrier phase observation value of the direct signals can be obtained; data screening is performed on the received GNSS satellite reflected signals, and eligible GNSS satellite reflected signals are selected, and the tracking frequency of the direct signals is adopted as a local reference frequency, and the selected GNSS satellite reflected signals are processed through adopting an open-loop tracking method, so that the residual phases of the GNSS satellite reflected signals can be obtained; and the flow velocity of a river can be obtained through inversion by combing the pseudo-range and the carrier phase observation value and by using the output values of the residual phases of the eligible GNSS satellite reflected signals.

Description

technical field [0001] The invention relates to the technical field of remote sensing, in particular to a method and system for measuring river velocity based on GNSS-R technology. Background technique [0002] The Global Navigation Satellite System (GNSS) is a collection of all global navigation satellite systems and their augmentation systems, including the GPS of the United States, the GLONASS of Russia, the GALILEO of the European Union and the Beidou navigation system of my country. As one of the most influential and practical space technology achievements, GNSS not only provides powerful tools for navigation and positioning, surveying and mapping, but also has rapid development in marine surveying. Some scholars have found that GNSS Reflected signals can be received and utilized, thus opening up a new research field - GNSS-R technology, and a new discipline based on this technology - GNSS-R ocean remote sensing. [0003] GNSS-R (Global Navigation Satellite Systems Ref...

Claims

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Application Information

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IPC IPC(8): G01S19/14G01P5/00
CPCG01S7/02G01S13/88G01S19/14G01P5/00
Inventor白伟华孙越强杜起飞王先毅孟祥广柳聪亮王冬伟吴迪李伟蔡跃荣吴春俊赵丹阳
OwnerNAT SPACE SCI CENT CAS