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Method of estimation of equivalent radar surface

一种雷达截面、模型估算的技术，应用在无线电波测量系统、仪器等方向，能够解决不允许确定RCS、难以应用复杂目标形状等问题

Inactive Publication Date: 2010-02-17
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, the bright spot method proves difficult to apply to complex target shapes and, in any case, does not allow determination of RCS at low frequencies

Method used

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  • Method of estimation of equivalent radar surface
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  • Method of estimation of equivalent radar surface

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Embodiment Construction

[0058] The target will then be considered, for which it is desired to estimate a monostatic or bistatic RCS, preferably but not exclusively at low frequencies in the sense defined above.

[0059] In general, for a given frequency f, the bistatic RCS description of a target can be expressed as a 2N×2N-dimensional matrix:

[0060]

[0061] where, for polarization π e = Direction of H or V for an incident wave with polarization π r =H or V receiving direction Each element is the value of the observed RCS. direction and (i, j=1, . . . , N) are advantageously but not necessarily equally distributed within the solid angle 4π. For example, the directions may be angularly equidistributed in azimuth and roll. It will be appreciated that the larger N is, the more accurate the description of the RCS will be. Advantageously, N will be chosen such that the sampling in terms of azimuth and roll satisfies the Nyquist criterion.

[0062] Matrix ∑ b It can also be expressed in...

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Abstract

The present invention concerns an estimation method for the equivalent radar surface (RES) of a given object by using a diffraction model for this object. The model is used for determining a base adapted to said object on which is projected a measure vector. The projected vector provides a reconstructed vector which is more complete than the measure vector in terms of directions / incident wave polarizations and diffracted wave observation, and the components whereof have a better signal / noise ratio than the measures. The reconstructed vector is then used for calculation of the SER. The invention also concerns a computer program for implementing the said estimation method.

Description

technical field [0001] The present invention relates to the field of radar markings and more particularly to the determination of radar cross sections. Background technique [0002] Radar cross section or RCS is the basic characteristic quantity of a target. It is used in the military field as well as in the civilian field (eg for aviation control) in order to identify objects (typically aircraft). [0003] The RCS of a radar target is generally defined by the balance of the power of the waves transmitted towards the target and the power of the waves received by the radar. In the far field and by approximating the wave as a plane wave, the radar equation is actually written as: [0004] P r = P e G e 1 4 πd 2 σ 1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 奥利维耶·瓦楚茨西尔万·莫尔万
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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