Method for acquiring target scattering data in circular scanning mode

Abstract

The invention relates to a method for acquiring target scattering data in a circular scanning mode. The method belongs to the technical field of scattering measurement. The specific implementation manner of the method comprises the steps of: acquiring near-field frequency domain scattering data of a target in the circular scanning mode; performing inverse Fourier transform on the near-field frequency domain scattering data to determine near-field distance domain scattering data of the target; determining far-field distance domain scattering data of the target according to the near-field distance domain scattering data; and determining far-field frequency domain scattering data of the target according to the far-field distance domain scattering data of the target. The method can avoid the deconvolution problem of transforming from far-field scattering to near-field scattering, calculates a near-field scattering response reversely by means of far-field scattering, and expands the application range of the scattering test.

Description

technical field [0001] The invention relates to the technical field of scattering measurement, in particular to a method for acquiring target scattering data in a circular scanning mode. Background technique [0002] With the continuous improvement of radar frequency, the far-field conditions required for the test of electrically large-scale targets are becoming more and more difficult to meet. The measurement thus performed is only a kind of near-field scattering measurement. At this time, the output of the test system cannot represent the realness of the target. Scattering characteristics, the near-field test of scattering characteristics requires correlation transformation of the collected signals to obtain the real far-field scattering characteristics of the target. [0003] For fighter air combat, terminal guidance radar and radio fuze, what is encountered is the problem of near-field scattering. If the far-field RCS of the target is known, the characteristics of the a...

AI Technical Summary

Problems solved by technology

Obviously, the near-field response can also be reversely calculated from the far-field scattering of the target from this relationship, but due to the imperfection of the measurement system, there will be a serious deviation between the expected target quantity and the test quantity measured by the system

If we use this method to directly obtain the near-field characteristics of the target, we will rely heavily on the theoretically challenging deconvolution and signal restoration methods. Therefore, it is difficult to obtain the near-field scattering characteristics of the target by directly inverting the forward convolution relationship.

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