Intrusion Detection System with Remote Signalling for Vehicles Using an Arduino Controller and Radio-Frequency Technology

Malicious activities or policy violations have been a concern for the past years. For example, many people have been victims of robbery on vehicles. A conceptual diagram of an Intrusion Detection System (IDS) [1] [2] for vehicles with remote signaling using an Arduino controller and radio-frequency technology is proposed in this paper. To address malicious activities on vehicles, two aspects are considered here, namely: notifier and detector. Firstly, an object-oriented C module that puts on and off a controller (installed inside the vehicle) and an anti-theft electronic editing that powered using an alternator and supported by a back-up battery are implemented. Secondly, a magnetic intrusion sensor, controlled by a proximity detector using radio-frequency technology, has been installed on each vehicle door. To enable IDS, a user needs to activate the monitoring system when leaving their vehicle. This is done using a remote system. In case the user does not activate the monitoring system while leaving the vehicle, a 5-meter-proximity detector will automatically lock the system and set off the monitoring system whenever the user is outside the detection zone. The detection zone is a 5-meter radius area centered at the controller. Here, monitoring consists of geolocating any intruders within the detection zone. This means, if any of the vehicle doors is opened while the system is still locked, the controller will activate the vehicle alarm for a few seconds, thereafter send an SMS notification to the owner. The system automatically unlocks as soon as the proximity detector is within the detection zone. The contribution of this paper, as compared to other similar work, is to reinforce the electronic implementation of IDS.

Radio Frequency Fingerprint-Based Satellite TT&C Ground Station Identification Method

This study presents a radio frequency(RF)fingerprint identification method combining a convolutional neural network(CNN)and gated recurrent unit(GRU)network to identify measurement and control signals.The proposed algorithm(CNN-GRU)uses a convolutional layer to extract the IQ-related learning timing features.A GRU network extracts timing features at a deeper level before outputting the final identification results.The number of parameters and the algorithm’s complexity are reduced by optimizing the convolutional layer structure and replacing multiple fully-connected layers with gated cyclic units.Simulation experiments show that the algorithm achieves an average identification accuracy of 84.74% at a -10 dB to 20 dB signal-to-noise ratio(SNR)with fewer parameters and less computation than a network model with the same identification rate in a software radio dataset containing multiple USRP X310s from the same manufacturer,with fewer parameters and less computation than a network model with the same identification rate.The algorithm is used to identify measurement and control signals and ensure the security of the measurement and control link with theoretical and engineering applications.

Combined disturbance-observer-based control and iterative learning control design for pulsed superconducting radio frequency cavities

The development of iterative learning control combined with disturbance-observer-based(DOB)control for the digital low-level radio frequency(LLRF)system of the International Linear Collider project is presented.The objective of this study is to compensate for both repetitive(or predictable)and unpredictable disturbances in a radio frequency system(e.g.,beam loading,Lorentz force detuning,and microphonics).The DOB control approach was verified using the LLRF system at the Superconducting Test Facility(STF)at KEK in the absence of a beam.The method comprising DOB control combined with an iterative learning control algorithm was then demonstrated in a cavity-simulator-based test bench,where a simulated beam was available.The results showed that the performance of the LLRF system was improved,as expected by this combined control approach.We plan to further generalize this approach to LLRF systems at the STF and the future International Linear Collider project.

Aerodynamic actuation characteristics of radio-frequency discharge plasma and control of supersonic flow

In this paper, aerodynamic actuation characteristics of radio-frequency(RF) discharge plasma are studied and a method is proposed for shock wave control based on RF discharge. Under the static condition, a RF diffuse glow discharge can be observed; under the supersonic inflow, the plasma is blown downstream but remains continuous and stable.Time-resolved schlieren is used for flow field visualization. It is found that RF discharge not only leads to continuous energy deposition on the electrode surface but also induces a compression wave. Under the supersonic inflow condition, a weak oblique shock wave is induced by discharge. Experimental results of the shock wave control indicate that the applied actuation can disperse the bottom structure of the ramp-induced oblique shock wave, which is also observed in the extracted shock wave structure after image processing. More importantly, this control effect can be maintained steadily due to the continuous high-frequency(MHz) discharge. Finally, correlations for schlieren images and numerical simulations are employed to further explore the flow control mechanism. It is observed that the vortex in the boundary layer increases after the application of actuation, meaning that the boundary layer in the downstream of the actuation position is thickened. This is equivalent to covering a layer of low-density smooth wall around the compression corner and on the ramp surface, thereby weakening the compressibility at the compression corner. Our results demonstrate the ability of RF plasma aerodynamic actuation to control the supersonic airflow.

Application of Radio Frequency Identification (RFID) in Dairy Information Management

As a kind of brand-new technology, radio frequency identification management, data control and acquisition. This paper introduced food safety system construction, analyzed the advantages and problems in dairy modem suggestions for solution according to the practical situation. （RFID） plays an important role in dairy information tracing and culture function extension of managing breeding technology, and finally put forward some

Influences of the inner diameter of the solid shielding tube on the characteristics of the radio-frequency cold atmospheric plasma jet

Active control of the local environment of the cold atmospheric plasma(CAP) jet is of great importance in actual applications since the CAP operates in an open atmosphere with the inevitable entrainment of the surrounding cold air. In this paper, the solid shielding effects of the cylindrical quartz tubes with different inner diameters on the characteristics of the CAP jets driven by a radio-frequency(RF) power supply are studied experimentally. The experimental results show that the total length of the shielded plasma jet can be increased significantly by an appropriate combination of the quartz tube inner diameter and that of the plasma generator nozzle exit with other parameters being unchanged. This phenomenon may be qualitatively attributed to the loss of diffusion of the charged particles in the radial direction under different inner diameters of the quartz tubes. Compared with the plasma free jet, the plasma shielding jet is produced with optimized parameters including longer plasma jet length, higher concentrations of chemically reactive species, higher rotational, vibrational, and electron excitation temperatures when the inner diameters of the solid shielding tube and the generator nozzle exit are the same. A maximum plasma jet length of 52.0 cm is obtained in contrast to that of 5.0 cm of the plasma free jet in this study. The experimental results indicate that the solid shielding effect provides a new method for the active control of the local environment of the RF-CAP jet operating in an open atmosphere.

Regulation and Control of Electromagnetic Field in Radio-Frequency Circuits and Systems

Since the first demonstrations of radio-frequency(RF)circuits,the physics of the electromagnetic(EM)field and its regulation and control with codesigned circuits,have become essential competencies of RF circuit designers.Leveraging advanced regulation or control methods,numerous high-performance circuits have been developed at RF and millimeter-wave(mm-wave)frequencies.Three main methods of electromagnetic regulation have been widely utilized,namely,the separation of electric and magnetic coupling paths,the manipulation of electromagnetic energy through the coupling of multiple tanks or multiple resonators,and the regulation of electromagnetic fields in air cavities or meta-substrates.The separated coupling paths of electric and magnetic fields provide guidance for designing a high-performance filter topology with a quasielliptical response through additional zeros.The manipulation of the EM field through electrical and magnetic intercouplings of multitanks or multiresonators,such as are used in oscillators,power amplifiers(PAs),etc.,results in remarkable power efficiency,size reduction,and wide bandwidth.The regulation of electromagnetism through an air cavity,patterned substrate,or metasubstrate reduces dielectric losses and size,especially when using a substrate integrated suspended line(SISL)platform.Many excellent circuits have been reported based on SISL with low loss,high integration,and self-packaging.Here,we present state-of-the-art cases that demonstrate the benefits of EM field regulation and control.

智慧矿山系统工程及关键技术研究与实践

针对智慧矿山复杂巨系统建设过程中存在的问题,提出了智慧矿山建设的总体技术架构,并分别从智慧矿山系统模型构建、地下空间重构与模型动态更新、机器视觉测量技术、瓦斯环境射频防爆测试方法、矿山安全闭环管控体系、智慧矿山标准体系等方面进行了详细阐述。将智慧矿山分为信息感知支撑层、边缘计算层、云数据中心、多型网络、矿山智能生产管控平台、矿山智能生产系统、智慧矿山运维管理系统,构建了基于多系统深度融合的智慧矿山技术架构。基于智慧矿山知识图谱及信息抽取技术,构建了以数据创新为驱动、通信网络为基础、数据算力为核心的智慧矿山系统模型。构建了以机器视觉感知信息为主、其他感知信息为辅的矿山井下三维视觉空间模型,提出了矿山井下场景三维视觉与空间重建框架,实现了矿山井下三维空间重构与动态更新。开发了基于机器视觉技术的井下设备位姿与煤岩界面识别算法,实现了对井下综采装备群及煤岩分界面的同时空测量。探讨了井下瓦斯环境下现行防爆标准对5G基站功率的限制及存在的不足,设计开发了射频电磁能防爆专用试验装置,为提升井下5G基站功率阈值提供了方法借鉴。提出了融合灾害信息全面感知、防控方案自主决策、防控装备协同控制的矿井灾害闭环管控系统技术架构,实现井下灾害的超前预测预警与协同防控。构建了智能化煤矿标准体系框架,剖析了我国煤矿与金属矿山智能化建设典型案例,提出了智慧矿山建设发展趋势及建议。

微波开关自动测试系统设计

针对当前微波开关指标测试流程复杂、测试方法自动化程度低问题,提出了一套集指标测试、数据采集和数据管理功能于一体的自动化测试系统;该系统基于微波开关生产及试验环节的实际使用需求,通过软件平台实现对通用测量仪器及遥控遥测设备、射频开关矩阵等设备的自动化控制,单次可满足最多16个微波开关的同步测试,可实现同轴型和波导型两类开关的S参数、切换时间、门限电压、接触电阻、跑荷等总计18种指标参数的测试和试验数据管理,达到了测试效率和试验质量的双提升。

RFID技术在食品智能包装和供应链追溯中的应用研究

目的介绍RFID技术,综述其在智能包装、食品供应链追溯的应用进展,以期为RFID技术的发展提供一定的理论基础。方法阐述RFID系统的组成、分类、工作原理及该技术的优点;分析RFID技术在监测食品包装内温度、湿度、pH、气体含量等参数的应用潜力;综述RFID技术在整个食品供应链(生产、加工、储运和销售环节)中的追溯进展;讨论目前RFID技术在实际应用中面临的问题和今后的发展方向。结论通过全面综述RFID技术在智能包装、食品溯源等方面的应用,表明RFID技术在食品领域具有广泛的应用前景,这对食品质量控制具有重要的意义。

基于射频电极群独立控制的适形消融系统设计

该研究旨在开发一种射频电极群独立控制系统,用于实现不规则组织的适形消融。与传统单一射频电压不同的是,该研究采用高频变压器隔离和射频负载匹配技术,将射频信号源分割为8组独立且具有相同相位和频率,但不同电压值的射频信号。实验结果表明,所设计的系统可分别独立输出多种组合射频信号。实际输出电压与理论计算电压的相对误差控制在6%以内,频率误差小于0.5%,且各组信号的相位相差小于1°。在仿生物组织加热实验中,控制电极群中各电极的电压,可实现不同形状的消融,且消融深度与施加的射频电压呈正相关。

儿童非囊肿型先天性梨状窝瘘的诊断及内镜微创治疗效果

目的探讨儿童非囊肿型先天性梨状窝瘘(CPSF)的诊断和内镜下微创手术治疗效果。方法回顾性分析2017年10月-2022年5月该院收治的76例非囊肿型CPSF患儿的临床资料,行喉镜、颈部彩超、食道钡餐、颈部CT和磁共振成像(MRI)检查,于全身麻醉支撑喉镜引导下,行低温等离子射频消融术。结果喉镜下可见梨状窝处内瘘口,影像学检查可见瘘管与咽部相通;术后发生暂时性声者嘶哑3例,乳牙脱落3例;术后随访12~40个月,46例初治患儿复发1例,30例非初治患儿复发1例,再次行内镜下低温等离子烧灼,术后随访均无复发。结论CPSF症状无特异性,内镜下发现内瘘口是诊断的金标准,超声可作为初筛手段,食道钡餐联合CT检查可提高诊断率,MRI可作为辅助诊断;支撑喉镜下低温等离子射频消融术具有安全、微创、美观、便捷和可重复操作等优点,可作为儿童非囊肿型CPSF治疗的首选方法。

L波段全国产化2.5 kW级脉冲模块设计

随着国防和民用技术的迅速发展,高性能的L波段脉冲模块成为雷达和通信领域的关键组件。文章介绍了一个全国产化的2.5 kW级L波段脉冲模块的设计流程。该模块采用先进的射频放大技术和脉冲形成网络设计,结合本土材料和工艺技术的优势,实现模块的高性能和低成本生产。仿真和实验验证表明,设计的模块满足了所有预期的技术参数,包括功率水平、脉冲宽度和效率,通过了严格的质量控制和可靠性评估。

低温等离子射频消融术治疗小儿鼾症的效果观察

目的分析低温等离子射频消融术(TCAR)治疗小儿鼾症的临床价值。方法选取2021年1月-2022年12月该院收治的120例小儿鼾症作为观察对象,采取随机数表法分为对照组(n=60,接受鼻内镜下扁桃体摘除+腺样体切除治疗)和观察组(n=60,采用鼻内镜下TCAR切除患者腺样体和扁桃体),比较两组患儿临床疗效、手术相关情况和睡眠质量。结果观察组有效率为93.33%,明显高于对照组的76.67%,差异有统计学意义(P<0.05);观察组术中出血量少于对照组,手术时间、症状缓解时间和住院时间短于对照组,VAS低于对照组,差异均有统计学意义(P<0.05);术前,两组患儿魁北克睡眠问卷(QSQ)评分、艾普沃斯嗜睡量表(ESS)和儿童阻塞性睡眠呼吸暂停低通气综合征疾病特异性生活质量调查(OSA-18)量表评分比较,差异均无统计学意义(P>0.05);术后,观察组ESS和OSA-18量表评分低于对照组,QSQ评分高于对照组,差异均有统计学意义(P<0.05);术后,两组患儿QSQ评分高于术前,ESS和OSA-18量表评分低于术前,差异均有统计学意义(P<0.05);观察组术后并发症发生率为1.67%,明显低于对照组的11.67%,差异有统计学意义(P<0.05)。结论采用鼻内镜下TCAR切除扁桃体和腺样体治疗小儿鼾症,相比于传统术式,有利于提高临床疗效,可进一步改善患儿通气功能,减轻患儿痛苦,缩短症状缓解时间,改善患儿睡眠质量和生活水平,减少术后并发症发生风险。

基于物联网技术的医院楼宇智能控制系统

当前系统控制效果差,智能化程度低,为此设计基于物联网技术的医院楼宇智能控制系统。物联网模块包括射频识别、网络传感器等单元,选择两种总线进行数据通信,以ARM构架为基础设计控制器芯片,通过对继电反馈PID控制算法实施PID参数求解,实现各种系统运行调度控制,通过智能策略模块,设置各种系统设备的开关状态,并采用在某大型医院作为测试对象,结果表明,所设计系统能够实现送排风系统、电梯系统、消防系统的全面智能控制,可以有效节省医院建筑电力消耗,具有较高的实际应用价值。

基于RFID与条码技术的离散制造生产线控制方法

为提高企业产品生产效率,降低企业离散制造生产线控制成本,研究基于射频识别(Radio Frequency IDentification,RFID)与条码技术的离散制造生产线控制方法。利用条码技术为每个物料分配一个条码,使用RFID技术为同类别的产品分配一个RFID标签,通过扫描标签与条码实现对生产过程和库存管理的控制,以及对离散制造生产线的全面控制。经过实践检验,该方法可以有效缩短产品出库、入库时间,提高产品生产效率,应用效果良好。

多模式家居门禁系统设计与实现

针对传统家居门禁系统功能模式单一且智能性不高,本文设计了一款结合数字密码、射频、生物识别的多模式家居门禁系统。该系统采用STM32F103C8T6主控芯片与数字密码输入按键模块、生物识别指纹模块、LCD1602显示模块、射频电路、蜂鸣器报警电路、开锁电路等,通过C语言编写各模块相关程序,完成数字密码的写入、存储及修改功能,生物识别信息的录入和识别功能、IC卡注册与删除功能。该电路的数字密码不仅可以多次修改,而且具有误输入时蜂鸣器长鸣警敌的作用。系统功能实测结果验证了该电路设计的可行性,能够满足家居门禁系统的控制要求,给用户带来人性化的体验且有一定的实际应用价值。

冷库轨迹光寻货及库位温差管控系统研究

在冷链产业快速发展、冷库运营数字化转型升级过程中,普遍缺少对库内库外的货物信息监控、管理和数据交互,冷库业务各阶段状态管理不足、信息模糊缺失,冷库运营效率低、能耗大。本文根据冷库行业的经营特点和管理模式,结合冷库管理与信息技术有机融合的发展趋势,系统阐述了一种冷库业务管控系统优化方案,针对性解决冷库业务数据模糊、能耗管控弱、货物寻找便捷性差等问题,旨在提升冷库作业全流程管理效率和冷库管理的自动化、智能化水平。

Self-adapting radiation control method for RFS in tracking

The aim of this paper is to achieve the radio frequency stealth(RFS) during the course of tracking by controlling the radiation energy and the interval of a radar. Firstly, we build the model of probability of interception with the once radiation during the course of tracking. Secondly, we establish the model of the cumulative probability of interception to describe the effect of RFS throughout the tracking process and obtain two solutions that are minimizing the probability of interception and the radiation times to reduce the cumulative probability of interception. Thirdly, we propose a self-adapting radiation energy control method(SARE)to minimize the probability of interception. Fourthly, we propose a self-adapting radiation interval control method(SARI) to minimize radiation times. Fifthly, combining SARE with SARI, we propose a SARE-SARI control method(SAEI) during the course of tracking.Finally, we compare SAEI with two others by simulation, and the results show the effect of RFS of SAEI is better than the other two,but we have to make a trade-off between the ability of RFS and the effect of tracking.

RFC中数字锁相环的设计

本文介绍了以可编程逻辑器件CPLD实现RFC中数字锁相环的设计，分析了设计原理，列出了详细的设计过程并例举数据以及仿真结果。