Complementary Kalman Filter as a Baseline Vector Estimator for GPS-Based Attitude Determination

The Global Positioning System (GPS) offers the interferometer for attitude determination by processing the carrier phase observables. By using carrier phase observables, the relative positioning is obtained in centimeter level. GPS interferometry has been firstly used in precise static relative positioning, and thereafter in kinematic positioning. The carrier phase differential GPS based on interferometer principles can solve for the antenna baseline vector, defined as the vector between the antenna designated master and one of the slave antennas, connected to a rigid body. Determining the unknown baseline vectors between the antennas sits at the heart of GPS-based attitude determination. The conventional solution of the baseline vectors based on least-squares approach is inherently noisy, which results in the noisy attitude solutions. In this article, the complementary Kalman filter (CKF) is employed for solving the baseline vector in the attitude determination mechanism to improve the performance, where the receiversatellite double differenced observable was utilized as the measurement. By using the carrier phase observables, the relative positioning is obtained in centimeter level. Employing the CKF provides several advantages, such as accuracy improvement, reliability enhancement, and real-time assurance. Simulation results based on the conventional method where the least-squares approach is involved, and the proposed method where the CKF is involved are compared and discussed.     

高校网络安全建设的探索与思考

The construction of cybersecurity is an important part of the information construction in university. It is an indispensable condition to help the information construction and a strong guarantee to serve the information support of teachers and students in uni- versity. The cybersecurity environment, atmosphere and guarantee ability of university need to be improved. Based on the related work and achievements of cybersecurity construction, some general schemes are put forward to provide reference for cybersecurity construction in university.     

控制点CGCS2000坐标的联测及解求

CGCS2000坐标系是我国目前精度最高的坐标系,其推广使用具有重大意义。文中在安装并学习美国高精度GPS基线处理软件GAMIT软件基础上,以4个无坐标信息观测墩为例,进行观测数据采集与数据处理方案的设计,以期获取4个观测墩的CGCS2000坐标。最终结果表明,各质量指标均满足限差要求,且平差后最弱边中误差满足《工程测量规范》(GB50026-2007)三等工程控制网的要求。     

提高沥青路面平整度的几项措施

根据沥青路面施工监理实践 ,介绍了提高沥青路面平整度的 10项措施 ,并对各项措施的施工关键点及有关注意事项进行了说明 ,以更好地解决平整度的问题。     

北京银泰中心楼盖体系舒适度设计

针对银泰中心刚度和阻尼较小的楼板系统的舒适度问题,提出了楼板系统舒适度设计的原理和计算方法。参照美国钢结构协会标准(AISC标准)中楼板系统竖向振动的计算公式和评定标准,对北京银泰中心工程三座主塔楼做了舒适度分析计算。通过计算可以看出,楼板体系的刚度、阻尼和有效重量对其竖向振动加速度起决定作用。     

荧光免疫层析试条光电信号处理及特征量选取

荧光免疫层析定量检测技术是一种正在兴起的即时检验技术。在前期荧光免疫层析定量检测仪的研究基础上,采用小波算法对A/D采样后的荧光信号进行去噪处理,选用中值滤波剔除基线漂移,最后比较了采用测试线峰值和面积作为特征量的定量检测效果。数据显示,去噪后信噪比提高10 d B,相对均方差减小30.4%;采用峰值和面积值作为定量特征量的测量CV值分别为5.1%和0.4%,测量误差分别为9.1%和0.9%。结果表明采用积分面积作为特征量对荧光信号进行定量检测具有更好的准确度和重复性。     

甚长基线近区时差测向联合定位及特性分析

双站协同无源制导是一种全新的反辐射导引体制,具有隐蔽性高、抗干扰能力强等特点。针对此应用中末制导阶段的目标无源协同定位问题,构建了甚长基线近区时差测向无源定位模型,分析了在这个模型下测距精度随测向夹角的变化规律,以及在各种攻击方向上所能达到的定位精度,并利用这个结果分析了无源末制导阶段导弹攻击阵位的优选条件,提高了无源定位精度。最后通过仿真验证了理论分析的有效性,从而为双站协同无源制导和反辐射精确打击等应用提供了新的参考。     

基于执业能力基准的工程管理专业“三型”人才培养

在国家新型城镇化建设战略背景下,土建类专业承担着为建筑业培养高水平人才的重任,现行的执业资格制度为高校人才培养模式改革提供了动因。文章通过剖析国际项目管理专业人士执业能力的知识、经验和素质三重要素,从复合型专业课程体系、应用型实践教学体系和外向型校园文化体系等视角,探讨了土建类专业"三型"人才培养体系的建构与路径。     

双波长红外激光诱发痛觉刺激研究

搭建红外波段双波长(1940 nm和980 nm)激光诱发痛觉刺激系统,探索基线温度控制、激光吸收导热涂层、致痛区域控制对痛觉刺激效果的影响。利用热电偶测温模块实时监测基线温度控制及涂抹20%氧合血红蛋白溶液时离体猪皮皮肤表面温度的变化;利用滤光片实现致痛区域控制。利用1940 nm激光模块实现了40℃基线温度控制,结合980 nm脉冲激光模块完成了联合痛觉刺激实验;皮肤表面涂抹20%氧合血红蛋白溶液时温降时间(110 ms)远低于空白对照(1.2 s)和风冷散热(341 ms),可提升痛觉信号质量;列举了三种不同尺寸滤光片下的温度场分布情况,证明了致痛区域的可控性。双波长红外激光诱发痛觉系统提出的三种技术对痛觉刺激效果有较好的促进作用,证明了这种痛觉刺激模式的可行性和可信性。     

Food safety assurance systems in Hong Kong

Hong Kong is the top food safety city in China. It is a large consumer-oriented city, with more than 95% of the food imported from abroad. The overall food safety rate has been 99.7% for the past 6 years. This paper discusses food safety assurance system in Hong Kong, specifically the food safety status of Hong Kong, its food safety regulation agencies and food safety assurance systems. The food safety assurance systems in Hong Kong developed to protect consumers could benefit China as a whole and other developing countries.