Low power and agile sensor data retrieval using dual interface passive RF tag
Low power and agile sensor data retrieval using dual interface passive RF tag
复制标题
使用双接口无源射频标签进行低功耗和敏捷的传感器数据检索
DOI：
10.1109/rfid-ta.2010.5529869
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Murai
中科院分区：
文献类型：
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作者：
Kenichi Sugimoto;J. Mitsugi;Osamu Nakamura;J. Murai
考虑这样一种情况：希望通过移动的询问器从任意环境检索传感器数据。例如，路灯和管道中的电气设备的维修。该系统的基本问题是：1)传感器功耗与询问者数据检索率之间的权衡关系；2)移动询问者数据检索的敏捷性。较高的占空比会增加传感器的功耗，而较低的占空比会导致较低的可靠检索率。尽管已经有了从数据包到达率出发的“自适应睡眠周期控制”等努力，但它们并没有系统地解决这个问题，特别是对于移动询问器环境。本文提出了一种分离传感器采样时序和传感器数据检索时序的解决方案。异步数据检索机制是由一个双接口超高频无源射频标签，称为“记录器标签”，作者一直在开发。本文研究了一个原型记录器标签的功耗构成。从“传感器采样间隔与电池寿命”的角度讨论了所提数据检索方法的功耗效率，并与现有方法进行了比较。作者还评估了通过移动询问器检索传感器数据的可行性。我们特别考察了“询问者移动速度与数据检索成功率”之间的关系。测试表明，使用商用1.2V可充电电池，记录仪标签在30分钟的采样间隔下持续21天的亮度和温度传感，将传统电池寿命延长了10倍，同时仍然保持100%的传感器数据检索时间。当使用优化电路时，预计功耗将是效率的八倍。在模拟衰落环境下进行的实验表明，当移动询问器与记录器之间的最大相对速度小于3km/h时，数据检索率最高，27dBm EIRP询问器的最佳分离距离为10cm。通过优化防碰撞程序和提高记录仪标签的灵敏度，可以提高3公里/小时的移动速度。
Consider a situation where one desires to retrieve sensor data from an arbitrary environment via a moving interrogator. Maintenance of street lights and electric apparatus in conduits for example. The fundamental problems with this system have been 1)the trade-off relation between power consumption by sensor and the data retrieval rate for the interrogator, and 2)the data retrieval agility for the moving interrogator. A higher duty ratio incurs more power consumption in sensors whereas a lower duty ratio leads to a less reliable retrieval rate. Even though there have been such efforts as" adaptive sleep period control "which was derived from the packet arrival rate, they didn't systemically solve the problem, particularly for moving-interrogator environment. This paper presents a solution of separating the timing of sensor-sampling and the timing of sensor-data retrieval. The asynchronous data retrieval mechanism is facilitated by a dual interfaced UHF passive RF tag known as a "recorder tag" which the authors have been developing. This paper examines the power consumption composition of a prototype recorder tag. The power consumption efficiency of the proposed data-retrieval method is discussed in comparison with that of the existing method in terms of "Sensor Sampling Interval vs. Battery Life Expectancy." The authors also evaluated the viability of retrieving sensor data through a moving-interrogator. We specifically inspected the relationship of "Interrogator's Moving Speed vs Successful Data Retrieval Rate." The tests showed that with a commercial 1.2V rechargeable battery, the recorder tag lasts for 21 days forluminance and temperature sensing using a 30 minute samplinginterval, extending the traditional battery lifespan ten times longer, yet still preserving 100% time availability for sensor data retrieval. The power consumption is expected to be eight times as efficient when using optimized circuitry. Experiments in an emulated fading environment reveal that the data retrieval rate is observed to be the highest when the maximum relative speed between the moving-interrogator and the recorder tag is less than 3km/h, with an optimized distance of separation being 10cm for a 27dBm EIRP interrogator. The moving speed, 3km/h, can be improved by optimizing the anti-collision procedure and by enhancing the sensitivity of the recorder tag.