High-precision insect body axis orientation extracting method based on polarization scattering matrix estimation

A technology of polarization scattering matrix and extraction method, applied in the field of insect radar, can solve the problems of poor orientation accuracy and pollution, and achieve the effects of good performance, high precision and robustness

Active Publication Date: 2017-06-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

This assumption is only valid when the body length of the insect is small compared to the radar wavelength, and is polluted by radar noise, and the accuracy of extracting the orientation is poor

Method used

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  • High-precision insect body axis orientation extracting method based on polarization scattering matrix estimation
  • High-precision insect body axis orientation extracting method based on polarization scattering matrix estimation
  • High-precision insect body axis orientation extracting method based on polarization scattering matrix estimation

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Embodiment Construction

[0051] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0052] Firstly, the insect echo signals in each polarization direction collected by the rotating polarization radar are modeled. Regardless of the Faraday rotation effect, in the case of a single station, the PSM is a symmetric matrix, assuming that the PSM of the insect is

[0053]

[0054] Among them, a 1 、a 2 、a 3 Respectively represent the magnitude of each element, φ 1 , φ 2 , φ 3 represent the phase of each element, respectively.

[0055] For rotating linearly polarized radars, the transmitted signal E t The polarization direction of (t; α) is rotated by α and expressed as

[0056]

[0057] Where t is time, α is the antenna polarization direction, and s(t) represents the signal waveform. Assuming that the polarization mode of the receiving antenna is the same as that of the transmitting antenna, after the transmitted signal is scattere...

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Abstract

The invention discloses a high-precision insert bdy axis orientation extracting method based on polarization scattering matrix estimation. The high-precision insert axis orientation extracting method can be used for extracting an insect body axis orientation by means of a rotation-polarized insect radar with a vertical beam. According to the high-precision insert body axis orientation extracting method, an insect echo signal model of orientation directions which are acquired by the rotation-polarized insect radar is established; furthermore a method of extracting the polarization scattering matrix from an insect echo signal through a two-order polynomial approximate iteration method is presented; and then a method of extracting the insect body axis orientation from the polarization scattering matrix is introduced; and effectiveness and accuracy of a body axis orientation extraction algorithm are verified through insect data which are actually measured by an S-waveband radar.

Description

technical field [0001] The invention belongs to the technical field of insect radar, and in particular relates to a high-precision insect body axis orientation extraction method based on polarization scattering matrix estimation. Background technique [0002] The emergence of insect radar provides a powerful tool for monitoring high-altitude insect migration. At present, the vertical beam radar mainly used can obtain biological parameters such as mass, wing frequency, body axis orientation, displacement speed, displacement direction, trajectory, and height of insects flying through its beam through rotating polarization and beam nutation. , population density and other behavioral parameters. According to these parameters, we can judge the species of insects, biological flux, and predict the direction of insect migration, so as to make early warnings. This is of great significance for preventing outbreaks of pests and diseases and studying the theory of insect migration. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88
CPCG01S13/88
Inventor 胡程王锐李卫东龙腾曾涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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