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Parallel and vertical insect distinguishing method based on characteristic phase

An insect and phase technology, applied in the field of insect radar, can solve problems such as identification errors, and achieve the effect of high success rate

Active Publication Date: 2020-04-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, this method will have discrimination errors for insects whose polarization invariants are near the critical value, and this method is only applicable to the X-band

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  • Parallel and vertical insect distinguishing method based on characteristic phase
  • Parallel and vertical insect distinguishing method based on characteristic phase
  • Parallel and vertical insect distinguishing method based on characteristic phase

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Embodiment Construction

[0032] The present invention provides a parallel and vertical insect discrimination method based on eigenphase, its basic idea is, first use insect scattering matrix to solve 2 eigenvalues, then calculate the phase difference between large eigenvalue and small eigenvalue, namely eigenphase, Finally, the characteristic phase is used as a parameter to identify the insect species. The basis for identification is: if the characteristic phase is less than 0, the insect is a parallel insect; if the characteristic phase is greater than 0, the insect is a vertical insect.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0034] Let the insect scattering matrix (SM) be:

[0035]

[0036] where, s 11 , s 12 , s 21 and s 22 are the amplitudes of each element of the scattering matrix, respectively, and β, β′, and γ are the corresponding phases. For monostatic radar, s 12 =s 21 And β=β'.

[0037] The p...

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Abstract

The invention discloses a parallel and vertical insect distinguishing method based on a characteristic phase. A radar is used for measuring a scattering matrix of an insect target, two characteristicvalues are solved, then the phase difference, namely the characteristic phase, of a large characteristic value and a small characteristic value is calculated, finally the characteristic phase serves as a parameter to distinguish the type of the insect, and the distinguishing basis is that if the characteristic phase is smaller than 0, the insect is a parallel insect, and if the characteristic phase is larger than 0, the insect is a vertical insect. The method can distinguish whether the insect is a parallel insect or a vertical insect, is used for overcoming a 90-degree orientation error whenthe traditional insect radar is used for estimating the insect body axis orientation, and improves the orientation estimation accuracy. The method is helpful for researching migratory flight behaviorsof insects, predicting migratory flight directions of the insects, and early warning against outbreak of plant diseases and insect pests.

Description

technical field [0001] The invention belongs to the technical field of insect radar, and in particular relates to a method for distinguishing parallel and vertical insects based on characteristic phases. Background technique [0002] Insect radar is an important tool for insect migration monitoring. The current insect radar is mainly ZLC (vertical to the sky, linear polarization, conical scanning) system X-band vertical observation radar. By rotating the polarization and the nutation of the beam, the system radar can obtain the biological parameters such as mass, wing frequency, and body axis orientation of insects flying through its beam, as well as the behavior of displacement speed, displacement direction, trajectory, height, and population density. learning parameters. According to these parameters, the species and biological flux of insects can be judged, and the migration direction of insects can be predicted, so as to give early warning. This is of great significan...

Claims

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Application Information

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IPC IPC(8): G01S13/88G01S7/02G01S7/41
CPCG01S13/88G01S7/024G01S7/41
Inventor 胡程王锐李卫东曾涛龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY