Capability Statement: Not applicable. Conflicts of Interest: The authors declare no conflict of interest.
applied sciencesArticlePolar Area Integrated Navigation Approach Primarily based on Pretilachlor supplier covariance TransformationYongjian Zhang, Lin Wang , Guo Wei and Chunfeng GaoCollege of Sophisticated Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; [email protected] (Y.Z.); [email protected] (G.W.); [email protected] (C.G.) Correspondence: [email protected]: Aircraft flying the trans-arctic routes typically apply inertial navigation mechanization in two unique navigation frames, e.g., the regional geographic frame along with the grid frame. Nevertheless, this adjust of navigation frame will bring about filter overshoot and error discontinuity. To solve this Atabecestat Description challenge, taking the inertial navigation system/global navigation satellite program (INS/GNSS) integrated navigation method as an example, an integrated navigation technique based on covariance transformation is proposed. The relationship from the system error state involving different navigation frames is deduced as a implies to accurately convert the Kalman filter’s covariance matrix. The experiment and semi-physical simulation benefits show that the presented covariance transformation algorithm can proficiently solve the filter overshoot and error discontinuity caused by the alter of navigation frame. Compared with non-covariance transformation, the system state error is thereby decreased drastically. Search phrases: covariance transformation; integrated navigation; polar regionCitation: Zhang, Y.; Wang, L.; Wei, G.; Gao, C. Polar Region Integrated Navigation Method Based on Covariance Transformation. Appl. Sci. 2021, 11, 9572. https://doi.org/ ten.3390/app11209572 Academic Editors: Kamil Krasuski and Damian Wierzbicki Received: 8 June 2021 Accepted: 12 October 2021 Published: 14 October1. Introduction Considering that the distance of a fantastic circle flight route is shorter, employing trans-arctic routes can accomplish fantastic savings in flying time when aircraft make transcontinental flights. Due to the demands of flight security, every aircraft commonly makes use of an INS/GNSS integrated navigation system to supply high-precision navigation info. The INS/GNSS integrated navigation technique has broad development prospects. Earlier literature [1] proposed an integrated navigation scheme based on INS and GNSS single-frequency precision point positioning, which is expected to be an advantage for low-cost precise land automobile navigation applications. A number of researchers [2,3] have discussed the application of GNSS/INS on railways. Classic INS/GNSS-integrated navigation algorithms are primarily based on a north-oriented geographic frame. Even so, because the latitude increases, the traditional algorithms shed their efficacy inside the polar area due to the meridian convergence. To solve this problem, when the aircraft is within the polar area, pilots generally program their route primarily based on polar-adaptable coordinate frames, which include the Earth-centered Earth-fixed frame (e-frame) [4], transversal Earth frame (t-frame) [5,6], pseudo-Earth frame [7], wander frame [8] and grid frame (G-frame) [9,10]. Despite the fact that these coordinate frames are adaptable to polar regions, they can’t achieve profitable international navigation individually due to the fact some of them have specific mathematical singularities, like the t-frame, pseudo-Earth frame, wander frame, and G-frame. These coordinate frames are often adopted only in the polar reg.