【 Notes 】WLPS Preliminary Introduction

wireless local positioning systems ( WLPSs )

WLPS is a hybrid TOA and DOA positioning method. Based on the classification discussed in Figure 1.1 , it can also be considered as an active remote positioning system.

Figure 1.1

The system comprises a monitoring mobile unit (or dynamic base station [ DBS ]) and a target mobile unit (or active target) [2, 15] . The target mobile unit is also called the transceiver (TRX). The active target contains a transponder and is assigned a unique identification (ID) code.

该系统包括监视移动单元（或动态基站[DBS]）和目标移动单元（或活动目标）[2,15]。 目标移动单元也称为收发器（TRX）。 活动目标包含转发器并被分配唯一标识（ID）代码。

As shown in Figure 1.4 a, the DBS sends the ID request ( IDR ) signal to all active targets in its vicinity. The active targets respond by each transmitting a packet that includes its ID code back to the DBS, which recognizes each target by its unique ID code.

如图1.4a所示，DBS将ID请求（IDR）信号发送到其附近的所有活动目标。 活动目标通过每个将包括其ID码的分组发送回DBS来响应，DBS通过其唯一ID码识别每个目标。

For positioning, the TOA and DOA of the target are estimated by DBS. As described earlier, DOA is estimated using antenna arrays mounted on the DBS. Using these measured values, the positions of active targets can be localized relative to the known position of the DBS.

对于定位，目标的TOA和DOA由DBS估计。 如前所述，使用安装在DBS上的天线阵列估计DOA。 使用这些测量值，可以相对于DBS的已知位置定位活动目标的位置。

WLPS can be considered as a node in a wireless ad hoc network, enabling all nodes (or specifi c nodes equipped with DBS) to localize all nodes located in their coverage area. The complexity of these systems lies mainly in the DBS, as they use antenna arrays for localization. The cost and complexity of TRX nodes is very low.

WLPS可以被视为无线ad hoc网络中的节点，使所有节点（或配备有DBS的特定节点）能够本地化位于其覆盖区域中的所有节点。 这些系统的复杂性主要在于DBS，因为它们使用天线阵列进行定位。 TRX节点的成本和复杂性非常低。

In many applications, such as battlefi eld command and control, a small number of DBS nodes (expensive units carried by commanders) and a larger number of active targets (low - cost units carried by soldiers) are required. Thus, the overall cost of these systems across all nodes is minimal.

在许多应用中，例如战场指挥和控制，需要少量DBS节点（指挥官携带的昂贵单位）和大量活动目标（士兵携带的低成本单位）。 因此，跨所有节点的这些系统的总成本是最小的。

In the WLPS system, each node can independently find the location of the transceivers located in its coverage area.

在WLPS系统中，每个节点可以独立地找到位于其覆盖区域中的收发器的位置。

multipath effects reduce TOA and DOA estimation performance. Therefore, the localization performance of each DBS node could be low. Multiple DBS nodes can cooperate to reduce the estimation error of the TRX nodes in their coverage area .

多径效应会降低TOA和DOA估计性能。 因此，每个DBS节点的定位性能可能很低。 多个DBS节点可以协作以减少其覆盖区域中TRX节点的估计误差。

The WLPS can be used for space, outdoor, and indoor applications [18] . For outdoor and indoor applications, direct sequence code division multiple access ( DS - CDMA ) integrated with beamforming (supported by antenna arrays) provides a reasonable level of detection performance. WLPS enables many applications such as road safety, security, defense, and robotic collaboration and coordination.

WLPS可用于空间，室外和室内应用[18]。 对于室外和室内应用，与波束成形集成的直接序列码分多址（DS-CDMA）（由天线阵列支持）提供了合理的检测性能水平。 WLPS支持许多应用，例如道路安全，安全，防御以及机器人协作和协调。

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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