小而强大:新加坡大学的微型卫星将无线传感器网络带入太空
2014年8月26日 - 新加坡的一组工程师团队成功地试行了世界上第一个Zigbee无线传感器网络(WSN)进行卫星通信。
With the weight of payloads being a major constraint in satellite design, constructing a lightweight, low power-consuming, wireless communication system to do away with cabling inside the satellite has always been a challenge for system designers.
新加坡南南技术大学卫星研究中心的工程团队推出了Velox-I,该工程由一个重3.5公斤的纳米卫星组成,校园的两个最高点,体重为3.5公斤,重肩picosatellite,重1.5千克。旨在测试一个假设,即Zigbee是一种廉价但功能强大的无线系统,在太空中的性能同样出色,两个微型卫星都配备了Zigbee Wireless网络,并配备了小型传感器节点。这些节点在卫星内执行诸如局部传感,分布式计算和数据收集之类的功能,以支持卫星内通信。
发现这些卫星能够在很长的距离内保持卫星间的通信。
This experiment marks a breakthrough in aeronautical engineering, having been designed to evaluate the performance of WSNs in space. After conducting Received Signal Strength Indicator tests on the satellites’ radio frequency modules, a maximum range of 1 km was found to be achievable for inter-satellite communication in the campus environment. An even longer communication range can be expected in free space, due to the absence of signal attenuation caused by fading and diffraction.
为了估计自由空间中卫星间通信的范围,该团队根据Friis传输方程进行了链路预算分析,得出了4.186公里的平均理论距离,最大为15.552 km。这些发现发表在《无人系统的特刊》中,提出了一个令人信服的案例,用于进一步研究具有更复杂设计的卫星间通信系统。
The team also found that by replacing internally wired connections with wireless links, a satellite’s mass could be reduced by as much as 10%. With the twin pressures of minimizing development costs and maximising risk diversification imposing major constraints on satellite design, the production of comprehensive yet lightweight systems could benefit significantly from WSNs.
尽管近年来WSN已在广泛的应用中使用,但到目前为止,它们在太空应用中的使用一直保持有限。新加坡团队的数据驱动调查已建立了一个未来飞行卫星任务的合理平台,并且似乎有望在太空中创造随后的旋转。
他们的报告出现在无人系统的无线传感器网络和应用程序中。
For more information, visitwww.worldscientific.com。
提交以下:M2M(机器到机器)
