Carrier phase height measurement device based on GNSS-R technology and method thereof

A carrier phase, altimetry device technology, used in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation and other directions

Inactive Publication Date: 2010-09-29
NAT SPACE SCI CENT CAS
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The patent uses a closed-loop method and...

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  • Carrier phase height measurement device based on GNSS-R technology and method thereof
  • Carrier phase height measurement device based on GNSS-R technology and method thereof
  • Carrier phase height measurement device based on GNSS-R technology and method thereof

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[0086] The invention is described with reference to various details set forth below and illustrated by the accompanying drawings. The following description and drawings are only examples for the present invention and should not be construed as limiting the present invention.

[0087] The GNSS-R data acquisition system of the present invention is a software receiver system. After the direct and reflected signals are respectively received by the antenna, the frequency is down-converted at the front end of the radio frequency, and input into the hard disk of the data receiving computer through the USB interface, and finally the direct signal and the reflected signal received at the same time are obtained. IF sampled raw data of the reflected signal.

[0088] The original sampling data passes through the preprocessing unit of the GNSS-R data acquisition system (including direct signal and reflected signal processing unit, open-loop tracking is an important part of reflected signal...

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Abstract

The invention relates to a carrier phase height measurement device based on a GNSS-R technology and a method thereof. The device comprises a GNSS-R receiving module, a direct signal processing module, a reflected signal processing module and a reflected signal carrier phase height measurement module, wherein the reflected signal carrier phase height measurement module comprises an open-loop tracking unit and a time differential phase height measurement unit; the open-loop tracking unit takes the direct signal tracking frequency as the local reference frequency so as to effectively track the GNSS reflected signal and obtain the reflected signal carrier phase observed quantity; and the time differential phase height measurement unit utilizes the single-frequency reflected signal phase observed quantity obtained by the open-loop tracking unit to invert accurate water level in a time differential phase height measurement method. The height measurement method accurately measures the water level by the GNSS water surface reflected signal carrier phase, and effective reflected signal phase observed quantity can be obtained by open-loop tracking. A time differential phase height measurement algorithm is simple and can realize high-accuracy height measurement of the water level within a short time.

Description

technical field [0001] The invention relates to the technical field of GNSS-R remote sensing, in particular to a device and method for retrieving water surface height by a GNSS-R open-loop differential phase method. Background technique [0002] GNSS-R ocean remote sensing technology is a technology that uses GNSS ocean reflection signals for remote sensing measurement. It mainly has the advantages of no need for a separate transmitter, rich signal sources, global coverage, all-weather and strong real-time performance. GNSS-R technology to measure ocean height is an important part of GNSS-R ocean remote sensing. There are two main ways to retrieve sea surface height by GNSS-R. One is to measure the height by using the code delay of the direct signal and the reflected signal. Carrier phase altimetry using reflected signals. [0003] Code delay altimetry has a wide range of applications, but requires long-term averaging to obtain centimeter-level measurement accuracy. For ca...

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Application Information

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IPC IPC(8): G01S19/14G01S13/02
Inventor 白伟华孙越强朱光武杜起飞
Owner NAT SPACE SCI CENT CAS
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