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Near-field backward rcs measurement system and method based on chain relation

A measurement method and measurement system technology, which is applied in the field of near-field backscattering radar cross-section measurement system, can solve problems such as unsatisfactory needs, and achieve the effects of convenient target transportation, improved conversion efficiency, and small interference clutter

Active Publication Date: 2021-04-06
BEIHANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

For large-scale RCS measurement systems, general-purpose instruments can no longer meet the needs

Method used

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  • Near-field backward rcs measurement system and method based on chain relation
  • Near-field backward rcs measurement system and method based on chain relation
  • Near-field backward rcs measurement system and method based on chain relation

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0061] figure 1 It is a schematic diagram of the current international point source near-field backward RCS test system. The size of the rectangular echo chamber in the picture is about: 40m(W)×60m(L)×25m(H), with an area of ​​2400 square meters. The radar transmitting antenna emits spherical waves, and the receiving antenna is the same as the transmitting antenna and placed at the same point.

[0062] The typical size of the measured target is: length 20m, height 5m. When the operating frequency is 8GHz, the far-field conditions in the horizontal and vertical directions are respectively:

[0063]

[0064] The test distance of the near-field RCS measurement system is about 50m to 200m. Regardless of the horizontal direction (φ direction) or the vertical direction (θ direction), it is difficult to meet the above far-field conditions.

[...

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Abstract

The invention discloses a near-field backward RCS measurement system and method based on a chain relationship. Using a line source perpendicular to the ground to generate cylindrical waves, the cylindrical field satisfies the far-field condition only in the height direction. In order to reduce side wall interference clutter, a "conical" anechoic chamber is designed. The echo level of the back wall of the cylindrical field is 10dB lower than that of the compressed field, which is beneficial to open the door of the darkroom on the back wall and facilitate the transportation of the target. The invention proposes a radar system for near-field RCS measurement, which includes a target and environment part, a microwave amplitude and phase measurement part, and a part that performs NFFFT and high-resolution imaging. The implementation method of near-field RCS measurement is also proposed, including the vector background cancellation between the bracket and the environment, and the measurement of the near-field scattering coefficient F. N The calibration, NFFFT and the second calibration in the NFFFT process, etc. It has advantages: ①NFFFT transform is simplified from two-dimensional to one-dimensional; ②Only the multiple diffraction in the horizontal direction on the target will cause errors; ③The interference clutter generated by the darkroom floor, roof gaps and steps is small.

Description

technical field [0001] The invention belongs to the field of low-observable technology and radar technology, in particular to a near-field backward radar cross-section (RCS) measurement system and method based on a chain relation. Background technique [0002] The traditional methods of RCS static measurement are external field and compact field. The outfield occupies a large area, is costly, has many sources of environmental interference, and has low measurement efficiency due to weather effects. The compact field works indoors, which overcomes the shortcomings of the external field, but the cost of the compact field increases with the size of the quiet zone. At present, it is mainly used in the RCS test of scaled models and components. [0003] The near-field RCS measurement system occupies a small area, works indoors, and its cost is much lower than that of a compact field. It is suitable for super-large target RCS measurement, so it has attracted attention at home and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 何国瑜李志平武建华王正鹏
Owner BEIHANG UNIV
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