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4D天线阵列布局设计
2022-07-23 05:47:00 【lightninghenry】
本篇主要讨论4D雷达天线阵列设计。4D毫米波雷达天线并不是说这个天线有4个维度,而是从目标特性的角度讲,被探测的目标有物理空间3个维度+频谱1个维度的特性。

而与天线设计有关的是方位向和俯仰向,以前的3D车载雷达是没有俯仰向的,所以4D比3D多的是俯仰向的信息。
车载毫米波雷达天线阵列指标包括:
- 天线视场角FoV
- 角分辨率
- 测角不模糊范围
- 测角精度
- 测角稳健性
这些指标相互制约,而且指标实际效果与波形、DOA算法、硬件设计、制造工艺相关。不同的应用需求,设计要求会有略微差异。因此,天线设计追求的是最合适最合理,而不是最完美。
1 阵列布局
基于车载毫米波雷达的3D-FFT处理,那么在俯仰维我们很容易联想到4D-FFT,那么利用MIMO雷达虚拟孔径技术的生成VAA(Virtual Antenna Array)也必须是均匀的面阵,于是就有了如下两种收发阵列设计方案(Jan Mietzner等提出)。
方案1: 方案2:
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