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Conformal array low sidelobe pattern synthesis method and system based on aperture field inversion

A technology of pattern synthesis and conformal array, which is applied in the microwave field to improve the comprehensive efficiency and avoid the complicated solution process

Active Publication Date: 2019-12-20
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: how to effectively improve the efficiency of conformal array low sidelobe pattern synthesis and provide a conformal array low sidelobe pattern synthesis method based on aperture field inversion, which is applicable to any curved surface The conformal array antenna greatly improves the comprehensive efficiency of the low sidelobe pattern of the conformal array antenna, and provides a new way for the low sidelobe pattern synthesis of the conformal array antenna, and the aperture field inversion optimizes the conformal array into a planar array Optimization, avoiding the cumbersome solution process of cross-polarization and non-coplanar phase centers, it is worthy of promotion and use

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  • Conformal array low sidelobe pattern synthesis method and system based on aperture field inversion
  • Conformal array low sidelobe pattern synthesis method and system based on aperture field inversion
  • Conformal array low sidelobe pattern synthesis method and system based on aperture field inversion

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Embodiment 1

[0045] Such as figure 1 Shown is the overall flow chart of the pattern synthesis method of the present invention. This embodiment provides a technical solution: a conformal array low-sidelobe pattern synthesis method based on aperture field inversion, including the following steps:

[0046] S1: caliber field inversion

[0047] Obtain the planar near-field data of the conformal array antenna, perform uniform normal weighting and superposition of the data to obtain the planar approach data of the conformal array antenna, define the aperture field plane according to the scanning direction of the conformal array antenna, and reverse the planar near-field data of the conformal array antenna In the aperture field plane, aperture field inversion converts conformal array optimization into planar array optimization, avoiding the tedious solution process of cross-polarization and non-coplanar phase centers, and is worthy of popularization;

[0048] S2: Unit amplitude and phase compensation

[0...

Embodiment 2

[0073] In this implementation, an arbitrary curved surface conformal array low-sidelobe pattern synthesis method based on aperture field inversion is used to optimize a conformal array antenna. The conformal surface is taken from an aircraft wing, and the antenna works in the 2.5GHz~3GHz frequency band. , The front size is 18 (azimuth) * 8 (elevation), and the antenna polarization direction is horizontal polarization. It is required that the sidelobe level of the azimuth plane is lower than -30dB when not scanning.

[0074] Such as figure 2 As shown, figure 2 This is a flow chart of the implementation of the method for synthesizing the low sidelobe pattern of the conformal array in this embodiment. First, complete the antenna erection in a microwave anechoic chamber, and collect the planar near-field data when each unit is individually excited by means of a planar near-field acquisition system and a multi-channel switch. Then the normal pattern synthesis is performed, and the ...

Embodiment 3

[0080] The conformal curved surface selected in this embodiment is taken from the fuselage of an aircraft, the antenna works in the frequency band between 3.2 GHz and 3.5 GHz, the front scale is 6 (azimuth) * 16 (elevation), and the antenna polarization direction is horizontal polarization. It is required that the sidelobe level of the pitch plane is lower than -30dB when the pitch sweep is 45 degrees.

[0081] Such as Image 6 Shown is the horizontal polarization pattern of the elevation plane when the array antenna is tilted and scanned at 45 degrees without weighting at 3.5 GHz. First, in the microwave anechoic chamber, the multi-channel switch is used to complete the acquisition of the planar near-field data when each unit is individually excited, and then the 45-degree planar near-field data synthesis is performed on the elevation scan, and the far-field pattern is obtained through the near-far field transformation.

[0082] Then select the aperture field plane perpendicular t...

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Abstract

The invention discloses a conformal array low sidelobe pattern synthesis method and system based on aperture field inversion and belongs to the technical field of microwave. The method comprises the following steps of S1, carrying out the aperture field inversion; S2, carrying out unit amplitude and phase compensation; S3, carrying out weighting amplitude optimization; and S4, synthesizing a far-field pattern. In the S2 and the S4, methods for obtaining conformal array antenna plane near-field data and synthesizing the far-field pattern are a time sharing data synthesizing conformal array testing method. The method and the system are applicable to an arbitrary curved surface conformal array antenna. Conformal array low sidelobe pattern synthesis efficiency is greatly improved. A new way for the conformal array low sidelobe pattern synthesis is provided. Through the aperture field inversion, conformal array optimization is transformed into plane array optimization. A cross polarizationand phase center non-co-planar complex solving process is avoided. The method and the system are deserved to be popularized.

Description

Technical field [0001] The invention relates to the field of microwave technology, in particular to a method and system for integrating low sidelobe pattern of conformal arrays based on aperture field inversion. Background technique [0002] Conformal antenna refers to an antenna conformal to a certain surface, and its shape is determined by other factors besides its electromagnetic characteristics, such as aerodynamics and fluid mechanics. Compared with the planar phased array antenna, the conformal antenna can provide wide-angle coverage; the profile is low and does not affect the aerodynamic performance of the carrier; while saving the limited space of the carrier, it also increases the available aperture. [0003] Array antenna pattern synthesis refers to the design of the antenna system according to the requirements, so that the pattern produced by the system closely approximates the required pattern. In the radar receiving state, the low sidelobe characteristics of the patte...

Claims

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Application Information

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IPC IPC(8): H01Q21/00
CPCH01Q21/00H01Q21/0087
Inventor 朱庆超张小林方佳金谋平苗菁
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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