On the basis of an analysis of the error sources in multibeam echosounding system,a data processing method for compensating systematic errors in multibeam survey is proposed.In order to improve the accuracy of overall...On the basis of an analysis of the error sources in multibeam echosounding system,a data processing method for compensating systematic errors in multibeam survey is proposed.In order to improve the accuracy of overall swath,a data fusion technique using single beam survey data as control information for single beam and multibeam echosounding is then presented.Some questions involved in solving the adjustment problem,such as its feasibility and the numerical stability,are discussed in detail,and a two_step adjustment method is suggested.Finally,a practical survey data set is used as a case study to prove the efficiency and reliability of the proposed methods.展开更多
Single passive sensor tracking algorithms have four disadvantages: bad stability, longdynamic time, big bias and sensitive to initial conditions. So the corresponding fusion algorithm results in bad performance. A new...Single passive sensor tracking algorithms have four disadvantages: bad stability, longdynamic time, big bias and sensitive to initial conditions. So the corresponding fusion algorithm results in bad performance. A new error analysis method for two passive sensor tracking system is presented and the error equations are deduced in detail. Based on the equations, we carry out theoretical computation and Monte Carlo computer simulation. The results show the correctness of our error computation equations. With the error equations, we present multiple 'two station'fusion algorithm using adaptive pseudo measurement equations. This greatly enhances the tracking performance and makes the algorithm convergent very fast and not sensitive to initial conditions.Simulation results prove the correctness of our new algorithm.展开更多
针对无人农业机器人在复杂作业环境中因频繁非视距(non line of sight,NLOS)通信导致超宽带(ultrawide band,UWB)定位系统量测波动大、精度低的问题,提出一种改进误差状态卡尔曼滤波(error-state Kalman filter,ESKF)的UWB与惯性导航单...针对无人农业机器人在复杂作业环境中因频繁非视距(non line of sight,NLOS)通信导致超宽带(ultrawide band,UWB)定位系统量测波动大、精度低的问题,提出一种改进误差状态卡尔曼滤波(error-state Kalman filter,ESKF)的UWB与惯性导航单元(inertial measurement unit,IMU)紧耦合定位技术。首先,采用非对称双面双向测距法结合线性拟合校准优化UWB量测数据,设计基于改进的均值滤波算法剔除离群值;其次,基于改进ESKF框架实现UWB-IMU协同定位,利用IMU状态预测信息构建自适应因子,动态调整量测噪声协方差矩阵以削弱NLOS误差影响;最后,搭建四轮无人农业机器人平台,在典型NLOS农业场景下进行静态及动态目标定位试验验证。结果表明,在动态轨迹跟踪中,相较于纯UWB和传统EKF算法,总体定位精度分别提升53.38%和25.15%。该方法在复杂遮挡环境下具有良好的鲁棒性,可为无人农业机器人实现高精度自主导航定位提供技术支撑。展开更多
文摘On the basis of an analysis of the error sources in multibeam echosounding system,a data processing method for compensating systematic errors in multibeam survey is proposed.In order to improve the accuracy of overall swath,a data fusion technique using single beam survey data as control information for single beam and multibeam echosounding is then presented.Some questions involved in solving the adjustment problem,such as its feasibility and the numerical stability,are discussed in detail,and a two_step adjustment method is suggested.Finally,a practical survey data set is used as a case study to prove the efficiency and reliability of the proposed methods.
文摘Single passive sensor tracking algorithms have four disadvantages: bad stability, longdynamic time, big bias and sensitive to initial conditions. So the corresponding fusion algorithm results in bad performance. A new error analysis method for two passive sensor tracking system is presented and the error equations are deduced in detail. Based on the equations, we carry out theoretical computation and Monte Carlo computer simulation. The results show the correctness of our error computation equations. With the error equations, we present multiple 'two station'fusion algorithm using adaptive pseudo measurement equations. This greatly enhances the tracking performance and makes the algorithm convergent very fast and not sensitive to initial conditions.Simulation results prove the correctness of our new algorithm.
文摘针对无人农业机器人在复杂作业环境中因频繁非视距(non line of sight,NLOS)通信导致超宽带(ultrawide band,UWB)定位系统量测波动大、精度低的问题,提出一种改进误差状态卡尔曼滤波(error-state Kalman filter,ESKF)的UWB与惯性导航单元(inertial measurement unit,IMU)紧耦合定位技术。首先,采用非对称双面双向测距法结合线性拟合校准优化UWB量测数据,设计基于改进的均值滤波算法剔除离群值;其次,基于改进ESKF框架实现UWB-IMU协同定位,利用IMU状态预测信息构建自适应因子,动态调整量测噪声协方差矩阵以削弱NLOS误差影响;最后,搭建四轮无人农业机器人平台,在典型NLOS农业场景下进行静态及动态目标定位试验验证。结果表明,在动态轨迹跟踪中,相较于纯UWB和传统EKF算法,总体定位精度分别提升53.38%和25.15%。该方法在复杂遮挡环境下具有良好的鲁棒性,可为无人农业机器人实现高精度自主导航定位提供技术支撑。
