This letter investigates the optimal sensor placement strategy for single static target localization using the hybrid received-signal-strength (RSS), angle-of-arrival (AOA) and time-of-arrival (TOA) measurements on the 2-dimensional (2D) plane. Firstly, the problem formulation is introduced. Secondly, the theoretical smallest trace of the Cramér-Rao lower bound (CRLB), which is equivalent to the smallest estimation mean-squared-error (MSE), is derived using the A-optimality criterion. Besides, we propose that the reachable smallest trace of the CRLB (tr(CRLB)) will be determined, once the number and characters of the sensors are selected. Thirdly, the corresponding optimal sensor placement strategies are proposed and concluded in two observations. Finally, the findings are demonstrated by simulation examples.

中文翻译：

---

使用混合 RSS、AOA 和 TOA 测量进行目标定位的最佳传感器放置

这封信研究了使用混合接收信号强度 (RSS)、到达角 (AOA) 和到达时间 (TOA) 测量在二维 (2D) 上进行单个静态目标定位的最佳传感器放置策略） 飞机。首先，介绍问题的表述。其次，Cramér-Rao 下界 (CRLB) 的理论最小迹线相当于最小估计均方误差 (MSE)，使用 A 最优性准则导出。此外，我们建议一旦选择了传感器的数量和字符，就可以确定 CRLB 的可达最小轨迹（tr(CRLB)）。第三，在两个观察中提出并总结了相应的最佳传感器放置策略。最后，通过仿真实例证明了研究结果。