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Symmetric polarization RCS (radar cross-section) testing method for targets at near fields

A technology of symmetrical polarization and testing method, which is applied in the field of target electromagnetic scattering characteristic measurement, can solve the problems that the direct measurement of the dipole probe antenna is difficult to meet the requirements, the test background interference is low, and the RCS measurement capability is low, so as to improve reusability, Effects of reducing measurement cost and increasing recognition probability

Active Publication Date: 2012-04-04
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

It can be seen that the test of symmetrically polarized RCS of near-field targets must solve the problems of reducing test background interference and improving low RCS measurement capabilities, and it is difficult to meet the requirements by direct measurement with dipole probe antennas

Method used

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  • Symmetric polarization RCS (radar cross-section) testing method for targets at near fields
  • Symmetric polarization RCS (radar cross-section) testing method for targets at near fields
  • Symmetric polarization RCS (radar cross-section) testing method for targets at near fields

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0038] Taking the target of dihedral angle combination as an example, the specific implementation of the symmetrical polarization RCS measurement of the near-field target is described (the frequency of the electromagnetic wave is 16 GHz, the transmission adopts symmetrical polarization, and the reception adopts vertical polarization):

[0039] Step 1: Observation antenna circular trajectory rotation scanning control and target binding

[0040] Different from the fixed observation antenna position in the usual RCS test, the symmetrically polarized RCS measurement here will use the stepping motor to drive the observation antenna to rotate off-axis to realize the circular trajectory scanning of the observation antenna: the distance between the observation antenna and the stepping motor shaft is The connecting rod is fixed, and the main beam point...

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Abstract

The invention relates to technology for measuring electromagnetic scattering properties of targets, and aims to provide an effective and feasible symmetric polarization RCS (radar cross-section) testing method for targets at near fields. An observation antenna rotationally scans along a peripheral track, the position and the posture of the observation antenna are changed, simulative symmetric polarization non-uniform illumination fields are combined, multiple times of target scattering measurements are successively carried out and realize coherent combination, symmetric polarization RCS measurement for the targets at the near fields is realized, and the shortcoming that measurement of polarization electromagnetic scattering data of the targets at the near fields is incomplete is overcome.

Description

technical field [0001] The invention relates to the measurement technology of target electromagnetic scattering characteristics. technical background [0002] In short-distance situations, target radar cross section (RCS) can be divided into basic polarization types such as vertical, horizontal and symmetrical, and the near-field target electromagnetic scattering data related to the actual horn antenna can be expressed as these basic polarization RCS (including amplitude and phase information). Since the symmetrically polarized RCS is mainly aimed at the non-uniform illumination of the short-range narrow-beam radar, its measurement requires that the measured target be in the non-uniform illumination area near the ideal dipole axis, that is, the illumination electric field in the area where the target is located is required to be on the equi-phase plane The amplitude above satisfies the change relationship of sinθ (where θ is the angle with the dipole axis); at the same time...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S7/40
Inventor 梁子长陈奇平张元
Owner SHANGHAI RADIO EQUIP RES INST
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