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关键词： ZigBee   RFID技术   智能网关  

摘要： 本项目拟研发了一款新型儿童多功能智慧书包,以ZigBee作为主控制器,采用水位传感器模块检测儿童是否出现溺水情况,采用射频识别技术(RFID)实现对小孩的跟踪,采用了智能网关WiFi模块和GPS模块,让家长实时掌握小孩的位置信息,为儿童安全问题提供保障。

关键词： 危险化学品   射频识别技术   信息化技术   物联网  

摘要： 为提升危险化学品行业的整体安全水平,减少运输装卸、储存保管和使用等环节的安全隐患,利用物联网、地理信息化、云计算、大数据等先进技术,建设危险化学品监管信息化平台,采用智能化、信息化的监管模式,有助于危险化学品管理,减少事故发生。这种主动式、精细化、智能化的安全监管,是危险化学品监管的发展方向。

关键词： 室内分布系统   RFID   可监控天线   智能运维  

摘要： 为消除传统室分监控盲区,提出基于RFID技术的室分天线监控方案,有效弥补了传统室分无源哑资源的管理劣势,实现了建设质量可管可控、智能运维和端到端室分资源管理的目标。

关键词： RFID   relative positioning   self-checkout  

摘要： Self-checkout services in today's retail stores are well received as they set free the labor force of cashiers and shorten conventional checkout lines. However, existing self-checkout options either require customers to scan items one by one, which is troublesome and inefficient, or rely on deployments of massive sensors and cameras together with complex tracking algorithms. On the other hand, RFID-based item-level tagging in retail offers an extraordinary opportunity to enhance current checkout experiences. In this work, we propose Taggo, a lightweight and efficient self-checkout schema utilizing well-deployed RFIDs. Taggo attaches a few anchor tags on the four upper edges of each shopping cart, so as to figure out which cart each item belongs to, through relative positioning among the tagged items and anchor tags without knowing their absolute positions. Specifically, a full-dimension ordering technique is devised to accurately determine the order of tags in each dimension, as well as to address the negative impacts from imperfect measurements in indoor surroundings. Besides, we design a holistic classifying solution based on probabilistic modeling to map each item to the correct cart that carries it. We have implemented Taggo with commercial RFID devices and evaluated it extensively in our lab environment. On average, Taggo achieves 90% ordering accuracy in real-time, eventually producing 95% classifying accuracy.

关键词： Resonators   RFID tags   Design methodology   Sensitivity   Antenna measurements   K-band   Chipless RFID   corner reflector   misalignment tolerant  

摘要： Chipless RFID is a relatively new and rapidly growing field that faces some practical implementation challenges. One of these challenges is extreme sensitivity to small misalignments between the tag and the reader antenna. These tilts and translations can lead to erroneous responses which can then be interpreted as incorrect IDs or sensing parameter values in identification and sensing applications, respectively. While there has been some work to mitigate this limitation through reading and post-processing methods, the problem has yet to be sufficiently addressed from the tag design perspective. This work proposes a misalignment-tolerant chipless RFID tag design methodology that utilizes trihedral corner reflector bases loaded with resonators to produce tags that are tolerant of pitch and yaw rotations up to +/- 40 degrees and roll rotations up to +/- 180 degrees (i.e., orientation independence as it is commonly defined in the chipless RFID field). This approach allows for linearly polarized monostatic reading schemes to be used and provides for a large radar cross-section and resonance depth, which increases the detectability of the tag response.

关键词： Castor fiber   Eurasian beaver   fixed readers   microchips   noninvasive methods   PIT tags   radio‐   frequency identification   remote monitoring   RFID  

摘要： The use of radio-frequency identification (RFID) offers new potential in remote wildlife monitoring to reduce the invasive nature of studies requiring direct contact with study animals. Facilitated by the emergence of new technology, RFID can remotely identify individual animals implanted with passive-integrated-transponder (PIT) tags. We aimed to establish and assess a new technique for remote RFID for remotely and noninvasively monitoring a wild population of a semi-aquatic mammal, the Eurasian beaver (Castor fiber). A fixed reader was installed from June 2018 to July 2019 at beaver lodges within the territories of 8 family-groups in Vestfold and Telemark, Norway, for 3 nights per lodge, with RFID antennas at lodge entrances. Microchipped beavers were detected when entering or leaving the lodge. The family-group size recorded using RFID was compared to the known family-group size based on live capture records and direct observations. The family-group size recorded using RFID was smaller than the known family-group size. However, testing suggested that individuals inhabiting a lodge with a fixed reader installed had a high probability of detection (98.44%). Fixed readers are effective where the identification of individuals at a focal point is appropriate, with unique applications for monitoring species with high fidelity to lodges or dens, or species that exhibit central-place foraging behavior. Research using RFID through fixed PIT tag readers should be given priority for noninvasive beaver population monitoring. Whereas fixed PIT tag readers may not record entire beaver family-groups, they provide an accurate and efficient alternative to other monitoring techniques. (c) 2021 The Authors. Wildlife Society Bulletin published by Wiley Periodicals LLC on behalf of The Wildlife Society.

关键词： Localization   Kalman filtering   Machine learning   RFID   Visible light localization   LOS localization  

摘要： Prior to the 21st century, positioning technologies had limited applications including air traffic control, air and sea navigation, satellite communications and related military uses. Today, positioning technologies have deeply merged with daily life and enabled many novel sensors, systems and services. For example, navigation systems are the enablers of road traffic prediction, assisted and autonomous driving, and several aspects of healthcare. They have also facilitated worldwide services provided by companies such as Uber and Lyft. In fact, in many aspects of modern life, localization systems are deemed essential to day-to-day living and are contributing to our general well-being, the economy, and security. Accordingly, position location technologies have become key components of many worldwide industries. These positioning technologies include the Global Positioning System (GPS), WiFi-based indoor localization, cell-phone based localization (including the fusion of GPS, cell-tower based localization and dead-reckoning), and inertial/dead-reckoning techniques. Tracking technologies are also considered key components for localization, as are the more recently integrated concepts of machine learning and artificial intelligence. This paper provides a review of the history of localization, the main technological enablers of localization and assesses the future directions of localization methods.

关键词： RFID tag   body feature   Deep learning  

摘要： Person identification plays a critical role in a large range of applications. Recently, RF based person identification becomes a hot research topic due to the contact-free nature of RF sensing that is particularly appealing in current COVID-19 pandemic. However, existing systems still have multiple limitations: i) heavily rely on the gait patterns of users for identification;ii) require a large amount of data to train the model and also extensive retraining for new users and iii) require a large frequency bandwidth which is not available on most commodity RF devices for static person identification. This paper proposes RF-Identity, an RFID-based identification system to address the above limitations and the contribution is threefold. First, by integrating walking pattern features with unique body shape features (e.g., height), RF-Identity achieves a high accuracy in person identification. Second, RF-Identity develops a data augmentation scheme to expand the size of the training data set, thus reducing the human effort in data collection. Third, RF-Identity utilizes the tag diversity in spatial domain to identify static users without a need of large frequency bandwidth. Extensive experiments show an identification accuracy of 94.2% and 95.9% for 50 dynamic and static users, respectively.

关键词： Resonant frequency   Radiofrequency identification   Couplings   Impedance   Switching circuits   Eddy currents   Mathematical model   Ferrite sheet   printed-coil resonator   radio frequency identification (RFID)   single-pole four-throw (SP4T) switch   tunable matching circuit  

摘要： The communication distance of Radio Frequency Identification (RFID) system is affected by the environment. This study presents a compact ferrite-less frequency-tuned printed-coil (PC) resonator, which introduces the additional PC resonators as well as the tunable matching circuits to the coil-based antennas, to address the rear metallic effect and the impedance mismatch effect caused by the environment variation for RFID system. The tunable matching circuit using the proposed negative voltage generator achieves low power consumption of only 0.5 mW. The usefulness of the proposed technique is experimentally validated with the rear metallic plate and the interference of water. Measurements show that compared with the commercial PC resonator, the proposed technique reduces the gaps between the coil and the rear metallic plate from 2.9 mm to 1.1 mm when the detected distance is 4.1 mm and, furthermore, improves the detected distance of the system from 3 mm to 17 mm with the interference of water.

关键词： RFID tags   UHF antennas   Surface impedance   Antenna measurements   Impedance   Internet of Things   radio frequency identification (RFID)   RFID tags   sensors   ultrahigh-frequency (UHF) communication  

摘要： A novel dual-band ultrahigh-frequency (UHF) radio frequency identification (RFID) sensor tag, designed to operate on metallic surfaces, is proposed. This particular UHF RFID sensor tag is capable of operating in both the main RFID frequency bands of the European Telecommunications Standards Institute (ETSI) and the Federal Communication Commission (FCC). The dual-band operation of the UHF RFID sensor tag is based on a very simple concept;by flipping the UHF RFID sensor tag on a metallic surface, it can operate either in the ETSI or FCC RFID frequency bands. The impedance and radiation characteristics of the UHF RFID sensor tag are presented with an extensive analysis of the effects of the metallic surface on the UHF RFID sensor tag. In addition, an equivalent model of the UHF RFID sensor tag, which includes the effects of the metallic surface on the sensor tag, is proposed. The UHF RFID sensor tag has a small form factor and presents a satisfying read range of around 3 m for both the operating frequency bands in a metallic environment as well as a read range of 1.4 m when operating in free space.