【 Notes 】DOA estimation Preliminary introduction

DOA estimation

In DOA estimation, base nodes determine the angle of the arriving signal (see Fig. 1.2 d). To allow base stations to estimate DOA, they should be equipped with antenna arrays, and each antenna array should be equipped with radio frequency ( RF ) front - end components. However, this incurs higher cost, complexity, and power consumption.

在DOA估计中，基节点确定到达信号的角度（见图1.2d）。 为了允许基站估计DOA，它们应配备天线阵列，每个天线阵列应配备射频（RF）前端组件。 然而，这导致更高的成本，复杂性和功耗。

Potential target location will lie on a line whose direction (θ 1 ) is determined by peak incoming energy signal using antenna array.

潜在目标位置将位于其方向（θ1）由使用天线阵列的峰值输入能量信号确定的线上。

Final target location will be a point that passed through the intersection of two lines whose directions (θ 1 ) and (θ 2 ) are determined by peak incoming energy signals using antenna arrays at two base nodes.

最终目标位置将是通过两条线的交点的点，其方向（θ1）和（θ2）由使用两个基节点处的天线阵列的峰值输入能量信号确定。

Similar to TOA and TDOA estimation, in DOA estimation, the positions of base nodes should be known. However, unlike TOA and TDOA, for the known position of a base node and a coplanar scenario, only two base nodes along with two DOA measurements are required. For a non - coplanar case, three base nodes are required. To determine the DOA, the main lobe of an antenna array is steered in the direction of the peak incoming energy of the arriving signal.

与TOA和TDOA估计类似，在DOA估计中，应该知道基节点的位置。 然而，与TOA和TDOA不同，对于基本节点的已知位置和共面场景，仅需要两个基本节点以及两个DOA测量。 对于非共面情况，需要三个基节点。 为了确定DOA，天线阵列的主瓣在到达信号的峰值输入能量的方向上被操纵。

最后，从上面的叙述我们知道，使用DOA估计目标的位置，需要使用天线，后面我们会更一步介绍这些内容。现在可能还不是太懂，天线阵列的内容，有缘后面再见！

DOA estimation techniques are discussed in Chapter 9 (Part II) of this handbook.

文章来源: reborn.blog.csdn.net，作者：李锐博恩，版权归原作者所有，如需转载，请联系作者。

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