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Measurable range expansion method and system of scattering test supporting suspension system

A technology that expands the method and scope, applied in low-observable fields, and can solve problems such as lack of data completeness

Active Publication Date: 2018-07-06
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

However, the existing great-circle scanning method of two cranes and one crane system indirectly obtains the measurement results of radar cross section (RCS) through nonlinear matrix transformation. This measurement method does not have the completeness of data. In the mode, the actual measurable range is only 64%, and the unmeasurable range reaches 36%.

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  • Measurable range expansion method and system of scattering test supporting suspension system
  • Measurable range expansion method and system of scattering test supporting suspension system
  • Measurable range expansion method and system of scattering test supporting suspension system

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Embodiment Construction

[0034] The specific implementation of the expansion of the measurable range of the scattering test support and suspension system of the present invention is as follows:

[0035] ①Roll angle β=0, for a series of discrete pitch angles α, turntable azimuth angle rotation;

[0036] ②Azimuth angle α=0, for a series of discrete roll angles β, the azimuth angle of the turntable rotation;

[0037] ③ Combine the two measurement results.

[0038] All the curves of the pitch angle α in the range of ±15° fall in Figure 7 In the area between the two red curves in a, the area is Figure 4 The mapping of the area shown in the target coordinate system is also the actual measurable data range of the great circle scan, such as Figure 7 shown. It is not difficult to calculate that the area of ​​the measurable area accounts for 64% during great circle scanning, such as Figure 7 as shown in b.

[0039] An important reason for data loss in the general working mode of the two-support an...

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Abstract

The invention discloses a measurable range expansion method and system of a scattering test supporting suspension system. An optimal work pattern is provided for a great circle scanning mode adopted by an existing double-support one-suspension system and used for expanding the measurable range of the double-support one-suspension system of a scattering test. Since a measurement result of a radar scattering cross section is obtained through non-linear matrix conversion in the great circle scanning mode of the double-support one-suspension system, the measurement mode has no data integrity. In the optimal work pattern, firstly, by changing the length of a lifting rope, measurement is conducted at different pitch angles alpha, then by changing the height difference between two supporting rods, measurement is conducted at different cross rolling angles beta, and the two measurement results are comprehensively used. According to calculation, compared with a normal work pattern, the measurable range expansion method has the advantage that the measurable range can be increased from 64% to 90%. In a mechanical design aspect of a bracket system, only the micro-adjustment degree of freedom of a transverse space between the supporting rods needs to be increased, the augmented cost for the change is limited, the stress of the supporting rods is basically not changed, and the system reliability and safety cannot be influenced.

Description

technical field [0001] The invention belongs to the low-observable technical field, and in particular relates to a method and technology for expanding the measurable range of a target support system in RCS measurement of a real combat stealth aircraft. Background technique [0002] In addition to traditional foam stents and low-reflection metal stents, a two-piece one-hanging support system has recently appeared, and their performance is shown in Table 1. In the scale model RCS measurement, foam brackets and metal brackets are mainly used. In the 1:1 full-scale aircraft measurement, the foam bracket is no longer convenient to use, and the metal bracket and the two-piece-one-lift system are used instead. The turntable of the metal bracket is on the top of the bracket (called the turn top). When measuring, a hole is opened on the target to be measured, and the turn top is embedded in the hole (to eliminate the reflection of the turn top). [0003] Table 1 Comparison of three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64F5/60
CPCB64F5/60
Inventor 何国瑜李志平武建华王正鹏
Owner BEIHANG UNIV
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