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Near field backward RCS measuring system and method based on chain relation formula

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, small interference clutter, and reduced interference clutter level

Active Publication Date: 2018-03-09
BEIHANG UNIV
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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 measuring system and method based on chain relation formula
  • Near field backward RCS measuring system and method based on chain relation formula
  • Near field backward RCS measuring system and method based on chain relation formula

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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 measuring system and method based on a chain relation formula; the method uses a line source vertical to the ground to form cylindrical waves, and a cylindrical surface field satisfies far field conditions only in the height direction; in order to reduce side wall interference clutters, a conical microwave darkroom is designed; the cylindrical surface field rear wall echo level is smaller than a compact field by 10dB, thus setting the darkroom door in the rear wall, and facilitating target transport. The invention provides a near field RCS measuring radar system comprising a target and environment portion, a microwave amplitude and phase measuring portion, and a NFFFT and high resolution imaging portion; the invention also provides a near field RCS measuring method comprising the following steps: support and environment vector background cancellation, measuring near field scattering coefficient FN scaling, and secondary scaling of the NFFFT and in a NFFFT process. The advantages are that 1, NFFFT transformation is simplified from two-dimension into one-dimension; 2, multi-diffraction in the horizontal direction of the target will cause errors; 3, interference clutters caused on the darkroom ground, roof slits and steps can be reduced.

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 Applications(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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