AI 中文总结
比较2比特反射阵列和时空调制反射阵列，提出幅度感知合成技术，通过引入相位容限窗口等，利用STM状态空间幅度分集，最大化孔径效率，降低STM反射阵列增益损失并抑制旁瓣。
AI 中文摘要
本文全面分析了2比特反射阵列架构引入的相位误差，并研究其对波束控制应用中孔径合成的影响。在此基础上，提出一种基于时空调制（STM）反射阵列的幅度感知合成技术，以减轻与基于STM的等效相位生成相关的主波束增益退化，同时保留时间编码实现的增强相位分辨率。考虑一个10λ×10λ、阵元间距为λ/2的反射阵列孔径，利用四个2比特相位状态在（L）个时间段内所有可能组合生成的可实现反射系数库合成所需孔径相位分布。该方法引入相位容限窗口并在允许相位范围内选择反射率最高的反射状态，利用STM状态空间的固有幅度分集最大化孔径效率并保持所需波束控制相位分布。数值结果表明，该方法大幅降低了与STM反射阵列通常相关的增益损失，并提供了显著旁瓣抑制。
英文摘要
This paper presents a comprehensive analysis of the phase errors introduced by 2-bit reflectarray architectures and investigates their impact on aperture synthesis for beam-steering applications. Building upon this analysis, an amplitude-aware synthesis technique based on space-time modulated (STM) reflect-arrays is proposed to mitigate the main-beam gain degradation commonly associated with STM-based equivalent phase generation while preserving the enhanced phase resolution enabled by temporal coding. A 10λby 10λ reflect-array aperture with λ/2 inter-element spacing is considered, where the desired aperture phase distribution is synthesized using a library of achievable reflection coefficients generated from all possible combinations of four 2-bit phase states distributed across (L) temporal segments. The proposed approach introduces a phase-tolerance window and selects the reflection state with the highest reflectance within the allowable phase range. By exploiting the inherent amplitude diversity of the STM state space, the proposed approach maximizes aperture efficiency while maintaining the desired beam-steering phase distribution. Numerical results demonstrate that the method substantially reduces the gain penalty typically associated with STM reflect-arrays along with providing significant sidelobe suppression.
