利用最小二乘支持向量机(least squares support vector machine,LSSVM)来对GPS在轨卫星钟差数据进行拟合,针对LSSVM拟合钟差两端发散的现象,利用加窗的方法进行抑制。采用IGS提供的精密钟差进行算例分析,发现加窗LSSVM钟差拟合算法比...利用最小二乘支持向量机(least squares support vector machine,LSSVM)来对GPS在轨卫星钟差数据进行拟合,针对LSSVM拟合钟差两端发散的现象,利用加窗的方法进行抑制。采用IGS提供的精密钟差进行算例分析,发现加窗LSSVM钟差拟合算法比现有的钟差拟合算法精度更高,且基于多项式的核函数比较适合加窗LSSVM钟差拟合。展开更多
To reduce the error in transfer alignment caused by reference information delay,a time delay estimation method is developed based on least-squares curve fitting of the angular rate integration.First,the gyro sensor me...To reduce the error in transfer alignment caused by reference information delay,a time delay estimation method is developed based on least-squares curve fitting of the angular rate integration.First,the gyro sensor measurements of the main strapdown inertial navigation system（M-SINS） and the slave strapdown inertial navigation system（S-SINS） are recorded for a few seconds and the integration of the data is calculated.Then,the possible maximum range of the delay value is defined and the points of the curve at different intervals are moved.The square of the differences between the corresponding points are calculated.Finally,the delay estimation can be acquired by the least-squares curve fitting of the M-SINS and the S-SINS.A delay compensation method by local data shifting is also presented.The simulation results demonstrate the effectiveness of delay estimation and indicate that the estimation accuracy is independent of the delay value.And the local data shifting compensation method can effectively reduce the errors of the transfer alignment caused by the reference information delay.展开更多
文摘利用最小二乘支持向量机(least squares support vector machine,LSSVM)来对GPS在轨卫星钟差数据进行拟合,针对LSSVM拟合钟差两端发散的现象,利用加窗的方法进行抑制。采用IGS提供的精密钟差进行算例分析,发现加窗LSSVM钟差拟合算法比现有的钟差拟合算法精度更高,且基于多项式的核函数比较适合加窗LSSVM钟差拟合。
基金The National Basic Research Program of China(973 Program) (No. 613121030201)the Fundamental Research of Commission of Science,Technology and Industry for National Defense (No. C1420080224)
文摘To reduce the error in transfer alignment caused by reference information delay,a time delay estimation method is developed based on least-squares curve fitting of the angular rate integration.First,the gyro sensor measurements of the main strapdown inertial navigation system（M-SINS） and the slave strapdown inertial navigation system（S-SINS） are recorded for a few seconds and the integration of the data is calculated.Then,the possible maximum range of the delay value is defined and the points of the curve at different intervals are moved.The square of the differences between the corresponding points are calculated.Finally,the delay estimation can be acquired by the least-squares curve fitting of the M-SINS and the S-SINS.A delay compensation method by local data shifting is also presented.The simulation results demonstrate the effectiveness of delay estimation and indicate that the estimation accuracy is independent of the delay value.And the local data shifting compensation method can effectively reduce the errors of the transfer alignment caused by the reference information delay.
