Rainfall foundation monitoring method based on GNSS signal depolarization effect

A rainfall intensity and depolarization technology, applied in rainfall/precipitation meters, measurement devices, ICT adaptation, etc., can solve problems such as unseen theoretical research and experimental results, and achieve rich signal resources, self-protection, and strong continuity Effect

Inactive Publication Date: 2014-03-05
PLA UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In 2010, E. Cardellach et al. proposed the concept of using GNSS polarized occultation signals received by low-orbit satellites to detect heavy rainfall, but no specific theoretical research and experimental results have been found in published literature so far.

Method used

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  • Rainfall foundation monitoring method based on GNSS signal depolarization effect
  • Rainfall foundation monitoring method based on GNSS signal depolarization effect
  • Rainfall foundation monitoring method based on GNSS signal depolarization effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] The GPS L1 frequency band signal (frequency 1575.42MHz) with right-hand circular polarization is taken as an example for analysis.

[0072] 1. Calculate the forward scattering amplitude

[0073] The GPS L1 frequency band signal that can be collected by the GNSS receiver after passing through the rain area is selected for calculation; assuming that when it rains, the temperature of the raindrop is 20°C, and the relative complex permittivity of the raindrop at this time is calculated using the Ray formula. According to the actual raindrop shape approximation model, the Rayleigh approximate ellipsoidal particle scattering algorithm is used to calculate the forward scattering amplitude f in the horizontal direction after the GPS signal of this frequency is incident on a single raindrop with different particle radii h and the forward scatter amplitude f in the vertical direction v .

[0074] 2. Calculate the propagation constant

[0075] According to the forward scatterin...

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PUM

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Abstract

The invention discloses a rainfall foundation monitoring method based on a GNSS signal depolarization effect. Relation of cross polarization discrimination (XPD) describing a GNSS signal depolarization effect and rainfall R can be calculated using a horizontal polarization component and a vertical polarization component of a GNSS forward scattering signal penetrating a rain area and combining distribution characteristics of a local raindrop spectrum; and the rainfall can be obtained using a value of the cross polarization discrimination (XPD) measured by a GNSS receiver and according to an XPD-R relation model. The rainfall foundation monitoring method based on the GNSS signal depolarization effect has important reference values for developing a relevant outfield experiment in next step, developing meteorology applications of the GNSS, estimating rainfall in real time, and observing rainfall in global areas; and the method also has significances for performing special advantages of the GNSS, developing a remote sensing technology over the ground, and novel detection technology for detecting area rainfall.

Description

technical field [0001] The invention belongs to the technical field of atmospheric remote sensing and atmospheric detection, and relates to a method for retrieving rainfall intensity by utilizing the depolarization effect of rainfall on air-ground link GNSS signals. Background technique [0002] Traditionally, people use rain gauges to directly obtain the rainfall intensity at a single point. Rain gauges have high precision in detecting single points of rainfall stations, and their measurement results are the basic data source for regional analysis. However, due to the sparseness of its layout and uneven distribution, the rain gauge observation is insufficient in the monitoring of precipitation in a large area. In recent years, the relationship between the reflectivity (Z), differential propagation phase shift (KDP), differential reflectivity factor (ZDP) and other parameters of ground-based meteorological radars and the relationship between rainfall intensity (R) has been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/14
CPCY02A90/10
Inventor 严卫安豪符养王迎强孙越强黄云仙艾未华韩英
Owner PLA UNIV OF SCI & TECH
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