针对组合导航姿态估计中无味四元数估计(unscented quaternion estimation,USQUE)的噪声协方差矩阵参数无法准确给出等问题,提出基于粒子群优化的USQUE(USQUE based on particle swarm optimization,PSO-USQUE)算法。通过粒子群算法对...针对组合导航姿态估计中无味四元数估计(unscented quaternion estimation,USQUE)的噪声协方差矩阵参数无法准确给出等问题,提出基于粒子群优化的USQUE(USQUE based on particle swarm optimization,PSO-USQUE)算法。通过粒子群算法对噪声协方差矩阵Q和R进行寻优,获取优化的噪声协方差矩阵等滤波先验条件;分别进行仿真实验和微机电惯导系统/GPS车载实验。实验结果表明,对于USQUE的姿态估计问题,PSO-USQUE算法相比常规算法具有更高的精度,验证了所提算法的有效性。展开更多
With the rapid development of lnternet technology, the volume of data has increased exponentially. As the large amounts of data are no longer easy to be managed and secured by the owners, big data security and privacy...With the rapid development of lnternet technology, the volume of data has increased exponentially. As the large amounts of data are no longer easy to be managed and secured by the owners, big data security and privacy has become a hot issue. One of the most popular research fields for solving the data security and data privacy is within the scope of big data governance and security, In this paper, we introduce the basic concepts of data governance and security. Then, all the state-of-the-art open source frameworks for data governance and security, including Apache Falcon, Apache Atlas, Apache Ranger, Apache Sentry and Kerberos, are detailed and discussed with descriptions of their implementation principles and possible applications.展开更多
文摘针对组合导航姿态估计中无味四元数估计(unscented quaternion estimation,USQUE)的噪声协方差矩阵参数无法准确给出等问题,提出基于粒子群优化的USQUE(USQUE based on particle swarm optimization,PSO-USQUE)算法。通过粒子群算法对噪声协方差矩阵Q和R进行寻优,获取优化的噪声协方差矩阵等滤波先验条件;分别进行仿真实验和微机电惯导系统/GPS车载实验。实验结果表明,对于USQUE的姿态估计问题,PSO-USQUE算法相比常规算法具有更高的精度,验证了所提算法的有效性。
文摘With the rapid development of lnternet technology, the volume of data has increased exponentially. As the large amounts of data are no longer easy to be managed and secured by the owners, big data security and privacy has become a hot issue. One of the most popular research fields for solving the data security and data privacy is within the scope of big data governance and security, In this paper, we introduce the basic concepts of data governance and security. Then, all the state-of-the-art open source frameworks for data governance and security, including Apache Falcon, Apache Atlas, Apache Ranger, Apache Sentry and Kerberos, are detailed and discussed with descriptions of their implementation principles and possible applications.
