Direct Position Determination of Multiple Interference Sources for Satellite Navigation
Satellite navigation signals reach the ground very weakly and are susceptible to various interferences,which has an in-fluence on users;In view of this situation,for the multi-interference source positioning scenarios in satellite navigation systems,tradi-tional two-step positioning algorithms are greatly affected by parameter estimation accuracy.Although the minimum variance distor-tion response with direct position determination(DPD_MVDR)algorithm improves the disadvantage of estimating the number of tar-gets in the multiple signal classification(MUSIC)positioning algorithm,it is difficult for the fixed grid resolution to balance the posi-tioning accuracy and computational complexity.To solve the above problems,an improved DPD_MVDR direct location method is proposed.By applying adaptive mesh refinement in the key technology of direct location.Its biggest advantage is that it can only a-chieve multi-level refinement of the grid near the interference source location,and can effectively balance the positioning accuracy and computational complexity,avoiding the huge computational complexity caused by traditional exhaustive search methods.Firstly,the DPD_MVDR algorithm is used to perform initial location estimation under coarse mesh,and then the adaptive mesh refinement is it-erated at the estimated location to reduce the computational complexity and improve the positioning accuracy.Simulation results show that the improved algorithm is less complex and more accurate than the DPD_MVDR algorithm,with a grid resolution of 100 m.It is suitable for the scenarios that have certain requirements for positioning accuracy and real-time positioning.
satellite navigation systemdirect positioning determination of multiple targetsMVDRadaptive grid refinementMUSIC
万方数据
维普
