In this paper, a method of orbit determination is presented according to the principle of unit vector method (UVM). The model and arithmetic are improved and it not only suits initial orbit determination with short ar...In this paper, a method of orbit determination is presented according to the principle of unit vector method (UVM). The model and arithmetic are improved and it not only suits initial orbit determination with short arc data, it also suits orbit improvement with data longer. It is also suitable for orbit of any eccentricity and any inclination. It omits most partial derivatives of all the elements which must be calculated in classical differential orbit improvement (DOI), so, it is more efficient than DOI, and the accuracy of orbit determination and convergence of algorithm are also improved appreciably.展开更多
The Unit Vector Method(UVM)is an orbit determination method extensively applied.In this paper,the UVM and classical Differential Orbit Improvement(DOI)are compared,and a fusion method is given for the orbit determinat...The Unit Vector Method(UVM)is an orbit determination method extensively applied.In this paper,the UVM and classical Differential Orbit Improvement(DOI)are compared,and a fusion method is given for the orbit determination with different kind data.Based on non-orthogonal decomposition of position and velocity vectors,an approximation scheme is constructed to calculate the state transition matrix.This method simplifies the calculation of the approximate state transition matrix,analyzes the convergence mechanism of the UVM,and makes clear the defect of weight strategy in UVM.Results of orbit the determination with simulating and real data show that this method has good numerical stability and rational weight distribution.展开更多
文摘In this paper, a method of orbit determination is presented according to the principle of unit vector method (UVM). The model and arithmetic are improved and it not only suits initial orbit determination with short arc data, it also suits orbit improvement with data longer. It is also suitable for orbit of any eccentricity and any inclination. It omits most partial derivatives of all the elements which must be calculated in classical differential orbit improvement (DOI), so, it is more efficient than DOI, and the accuracy of orbit determination and convergence of algorithm are also improved appreciably.
文摘The Unit Vector Method(UVM)is an orbit determination method extensively applied.In this paper,the UVM and classical Differential Orbit Improvement(DOI)are compared,and a fusion method is given for the orbit determination with different kind data.Based on non-orthogonal decomposition of position and velocity vectors,an approximation scheme is constructed to calculate the state transition matrix.This method simplifies the calculation of the approximate state transition matrix,analyzes the convergence mechanism of the UVM,and makes clear the defect of weight strategy in UVM.Results of orbit the determination with simulating and real data show that this method has good numerical stability and rational weight distribution.
