摘要
文章针对未来小行星表面探测的需要,研究了一种基于ZigBee组网技术的无线星表探测装置及其定位方法。探测装置采用迷你立方体构型设计,每个装置配备多个ZigBee模块,模块的天线围绕立方体呈对称分布式安装,以确保当探测装置落到小行星表面后,至少有一个ZigBee模块的通信状况良好且可进行组网。撒布在小行星表面的多个探测装置可以组成一个无线网络,以实现探测数据的传输和系统的定位。针对多探测装置无线网络拓扑结构的数学建模问题,提出了一种通过提取分析接收信号强度指示值(RSSI)来确定探测装置间相对距离的测量方法;基于对传统三边测量法的改进,实现了网络中探测装置的自主定位。在实验室环境下,搭建平台对系统的组网和定位功能进行了实验研究,验证了方案的正确性。
An asteroid surface probing device and its localization method are studied based on ZigBee network technology. The device is designed to have a miniature cubic configuration equipped with multiple ZigBee modules which are symmetrically installed on the cube. Such design guarantees at least one ZigBee module in the healthy communication state for networking after the distribution of the probing devices on the asteroid surface. The Received Signal Strength Indicator( RSSI)is extracted and analyzed to calculate the relative distance between devices for the modeling of the network topology. The classical trilateration is modified to accomplish the self-localization of the devices relative to the network and an experimental platform is designed to verify the proposed technology of networking and positioning in the lab environment. The simulation and experimental results demonstrated that the system has wide probing coverage and strong robustness, which implies that the system is of application value in asteroid surface exploration.
引文
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