A method for controlling grating lobes of an ultra-sparse array based on node position optimization

By designing node positions and optimizing using genetic algorithms, a multi-lobe emission pattern is formed, which solves the problem of low search efficiency in traditional radar and achieves a balance between efficient target search and spatial processing gain.

CN116819457BActive Publication Date: 2026-06-30UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Filing Date
2023-05-11
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional phased array radars have low search efficiency in ultra-sparse arrays, and MIMO mode suffers severe loss of spatial processing gain, making it difficult to balance spatial processing gain and target search efficiency.

Method used

By designing node positions, a transmission pattern with grating lobes is formed. Combined with digital simultaneous multi-beam technology, multi-grating lobe transmission and reception are realized. Genetic algorithms are used to optimize node positions to meet grating lobe conditions, thereby improving search efficiency.

Benefits of technology

While keeping the node aperture unchanged, the number of transmit beams is significantly reduced, improving search efficiency, while keeping the computational resources for the receive beams unchanged, thus enhancing the overall search performance of the radar.

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Abstract

This invention proposes a method for controlling the grating lobe of an ultra-sparse array radiation pattern based on node position optimization. By designing the node positions, a transmission radiation pattern with grating lobes is formed, allowing transmitted energy to radiate simultaneously in multiple directions. The target echo signal received at the receiver may originate not only from the main lobe direction but also from the grating lobe direction. Digital simultaneous multi-beam technology is employed to form a single main lobe receiving beam in each grating lobe direction, distinguishing the target in each potential direction. The multi-grating lobe operating mode effectively reduces the number of transmission beams, thereby significantly improving search efficiency. Since receiving beamforming can utilize digital simultaneous multi-beam technology, it only consumes computational resources and does not affect search efficiency.
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