MEMS四元数卡尔曼滤波算法的电梯姿态估计

将多维MEMS传感器应用于电梯监测,根据电梯的工作特点,优化四元数互补滤波方法修正陀螺仪数据求解电梯的实时姿态,然后应用卡尔曼滤波方法进一步提高姿态监测精度.实际验证表明,该方法可以提高电梯姿态监测数据的准确性,利用运行的姿态角和加速度峰度进行分析、比对可为电梯安全舒适度评估提供关键的数据依据.     

基于嵌入式系统的红外通讯解码应用

红外遥控是目前无线通讯中使用较为广泛的一种,具有协议简单、功耗低、适应性强的优点.基于红外遥控的通信协议,提出一种基于嵌入式系统的红外通讯方法,将波形采集和数据分析解码工作各自独立,具有波形采集完整、兼容性高和移植性强等优点.     

Achieving cost-efficient fail-operational behavior based on inherent redundancy at the system level

To fulfill their safety requirements, modern embedded systems are increasingly often expected to deliver a guaranteed minimum level of functionality at all times. In practice, such fail-operational systems are often based on fault tolerance mechanisms that are inadequate for use in cost-driven environments such as the automotive domain. In this work, we consider safety-critical embedded systems with a certain degree of spare resources at the system level and propose a cost-efficient fault tolerance approach that protects a pair of execution units from severe hardware faults. The concept requires no replication of an execution unit. Instead, it employs a state-preserving proxy unit that communicates with low-level devices such as sensors or actuators and handles faults of one execution unit by dynamically migrating the safety-critical portion of its functionality to the redundant counterpart. Based on the application of this concept to an example scenario from the automotive domain, we analyze the resource overhead of the proxy unit and evaluate both the achieved fault handling time and the generated computational overhead experimentally.     

Leakage free helper data storage in microcontroller based PUF implementation

Physical Unclonable Function (PUF) generates a unique identifier of a device, based on variations during a manufacturing process. Such identifier is difficult to predict or clone. It is used usually as a cipher key. Its weakness is, in general, a high sensitivity to changes in environmental conditions. In order to ensure stability, post-processing methods with error correction codes are usually applied. Unfortunately, these methods reveal, in many cases, sensitive data. We present a novel way to apply error correction code for the PUF. It is called Code Word Masking construction. This construction allows to generate PUF response in more secure way. Helper data are formed just by properly selecting PUF response bits. Therefore, helper data do not leak sensitive information. The selection is performed according to code words of the error correction code used. The method can be used for any type of weak PUF and many types of error correction codes. The error correction capability of the construction depends only on the capability of the error correction code. We describe this construction, and present an example of the PUF implementation based on the non-initialized values of the static random access memory using a 32-bit microcontroller. The implementation is more secure and has lower entropy loss compared to existing solutions. The reliability of the solution was proved through measurements under various environmental conditions. The implementation is improved by identifying and excluding the unreliable (’dark’) bits.     

基于Gradient Boosting算法的ERMS辐射数据预测

影响核辐射监测站点辐射监测HPIC剂量率实时数据准确性的组成因素多且复杂,如自然因素的降雨、温湿度、风向及太阳辐射等,客观因素的设备异常及放射性状况等;以致在实际应用中发现辐射监测状态异常时,很难分析出是什么原因导致的监测数据偏离.结合ERMS海量历史辐射序列监测数据,深入挖掘降雨、温湿度、气压、风向、太阳辐射天顶方向电子量及周边各站点辐射数值等特征因子集,基于Gradient Boosting算法（简称GB算法）建立起HPIC剂量率辐射数据的在线预测模型,有效融合自然特征因子,降低了自然因子对HPIC剂量率辐射监测数值异常的分析及判读的干扰作用,提高了对ERMS辐射异常发现的辅助判断能力及维保效率.     

DGA: Distributed geographic-sensing addressing method for linear-zone internet of things

Several applications of Internet of Things (IoT) have hundreds of nodes, and the expansibility and flexibility of the network can be greatly improved if the nodes can address themselves automatically and dynamically.Existing nodes addressing methods are mainly based on the logical relationships between nodes and routers. In this paper, the automatic geographic-sensing addressing method is studied for end-node (sensor/actuator) without satellite positioning device (such as global positioning system or Beidou system) for the application of IoT deployed in a linear area. The nodes ID is determined by its geographical location, which is very important for location-based routing and transmitting strategies. First, a sniffer method is designed to realize automatic addressing in an ideal state. Then, according to the actual application scenario, two distributed ID estimation algorithms based on received signal strength indicator(RSSI) and ranging are proposed. Through the deployment of LoRa-2.4 GHz wireless node for testing, results show that when the deployment distance between nodes is greater than twice the ranging error, the reliability of our algorithm can be guaranteed.     

基于北斗RDSS的核辐射监测应急通讯方法

北斗RDSS的短报文功能,特别适用于我国广袤崇山峻岭及荒凉孤岛等区域的电子传播,为突发事件的应急通讯提供支持.采用北斗通讯作为第二通信通道,根据其通信特点,结合核辐射数据的随机性特征,提出一种北斗应急通讯方法,提高了核辐射监测网的通讯应急能力.