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A Calibration Device Oriented to Measurement of Very Low RCS Targets

A technology of target measurement and calibration, which is applied in the field of radar scattering cross-sectional area measurement, can solve the problems of increased calibration error, test error, and large error, and achieve the effect of avoiding coupling problems and improving accuracy

Active Publication Date: 2017-11-24
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the metal cylinder is determined by the scattering level of the test target. For an extremely low RCS target (generally below -50dBsm), due to the small RCS, the size of the corresponding calibration metal cylinder is also smaller, resulting in the distance between the metal cylinder and the low-scattering support. Coupling and the effects of low-scattering mounts increase calibration errors
[0003] "Application of triangular plate corner reflector in RCS calibration test" provides a method of calibration test using triangular plate reflector. The shortcoming of this method is that it is only suitable for calibration test with large target RCS value. ; Standard metal balls are usually used for calibration tests with small target RCS values, but the disadvantage is that if the traditional calibration method is used, when performing calibration tests on extremely low RCS targets, due to the small size of the standard metal balls The RCS value is small, and the error introduced by the low-scattering bracket will be relatively large. The method of hanging the calibration method with a dielectric rope can avoid the additional scattering caused by the metal bracket. Perturbation will bring test error

Method used

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  • A Calibration Device Oriented to Measurement of Very Low RCS Targets
  • A Calibration Device Oriented to Measurement of Very Low RCS Targets
  • A Calibration Device Oriented to Measurement of Very Low RCS Targets

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Effect test

Embodiment 1

[0023] refer to image 3 The present invention is a calibration device for extremely low RCS target measurement, which includes a medium rope and a metal cylinder. The medium rope is a "Y"-shaped nylon rope, one end is connected to the metal cylinder, and the other two ends are fixed on the roof of the darkroom.

[0024] refer to figure 1 , figure 2 The metal cylinder has a diameter of 20mm and a height of 20mm. Four circular holes with a diameter of 0.1mm and a depth of 10mm are evenly distributed on its upper surface at a distance of 5mm from the central axis, which are used to inject mercury to adjust the attitude of the metal cylinder. A circular hole with a diameter of 0.1mm and a depth of 5mm is opened at the central axis of the upper surface of the metal cylinder, and the medium rope is fixed by cementing.

[0025] The described calibration device for the measurement of very low RCS targets takes the following steps to carry out preparatory work before calibration: ...

Embodiment 2

[0029] A calibration device for the measurement of extremely low RCS targets, including a dielectric rope and a metal cylinder. The medium rope is a "Y"-shaped nylon rope, one end is connected to a metal cylinder with a diameter of 5mm and a height of 5mm, and the other two ends are fixed on the roof of the darkroom. The upper surface of the metal cylinder is evenly distributed with 3 to 4 circular holes with a diameter of 0.1 mm and a depth of 3 mm from the central axis, and the openings of the circular holes are located on the upper plane of the cylindrical surface.

Embodiment 3

[0031] A calibration device for the measurement of extremely low RCS targets, including a dielectric rope and a metal cylinder. The medium rope is a "Y"-shaped nylon rope, one end is connected to a metal cylinder with a diameter of 80mm and a height of 80mm, and the other two ends are fixed on the roof of the darkroom. The upper surface of the metal cylinder is evenly distributed with 3 to 4 circular holes with a diameter of 3 mm and a depth of 50 mm from the central axis, and the openings of the circular holes are located on the upper plane of the cylindrical surface.

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Abstract

The invention belongs to the measurement filed of radar scattered sections, particularly relates to a calibration device capable of facing very low radar cross-section (RCS) targets to measure, which comprises a medium rope and a metal cylinder, wherein the medium rope is of a Y type, one end of the medium rope is connected with the metal cylinder, the other two ends are fixed on a high position, and round holes are uniformly distributed on the upper surface of the metal cylinder far away a distance with a center axial line. When measuring and calibrating very low RCS targets, the level posture of the metal cylinder can be adjusted by injecting mercury into the round holes, thereby solving the coupled problem of cylinders and a low scattering support when the cylinders are calibrated and the difficult problems that the level postures of the metal cylinder is difficult to guarantee by adopting the medium rope to hang the metal cylinder.

Description

technical field [0001] The invention belongs to the measurement category of radar scattering cross-sectional area, and specifically relates to a calibration method and device for extremely low RCS target measurement. By using a medium rope to suspend a metal cylinder with an adjustable center of gravity structure, the problem of cylinder calibration is solved. The coupling problem between the body and the low-scattering support and the difficulty in ensuring the horizontal attitude of the metal cylinder suspended by the dielectric rope. Background technique [0002] As a common calibration body for microwave radar cross-section measurement, metal cylinders have accurate theoretical values. Compared with standard metal ball openings, they have less influence on electromagnetic waves and can better eliminate the influence of background clutter. The size of the metal cylinder is determined by the scattering level of the test target. For an extremely low RCS target (generally be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 郑理吴亚齐张松靖戴全辉黄兴军
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH