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In order to obtain accurate gradient data and build the gravity gradient reference database for the gravity gradient aided inertial navigation system (GGAINS), the fast frequency method for digital elevation model forward gravity gradient was investigated in detail. The Parker's forward method based on discrete cosine transform (DCT) had been deduced to calculate the full tensor gravity gradient,...
To analyze the relationship between referenced gravity map and location precision in gravity-aided navigation, this paper analyzes the characteristics of gravity map using the method of mathematics. According to the research on the navigability of different areas, we select the more suitable area for realizing high-precision navigation. The effect on the area's navigability of each statistical parameter...
To restrain the error of inertial navigation system (INS), gravity-aided navigation system is introduced. The principle of gravity-aided navigation system is expatiated. By using Kalman Filter, error correcting of inertial navigation system comes true. Extended Kalman Filter (EKF) model is derived, and a method of gravity filed linearization is given. Based on the analysis of the shortage of EKF,...
In order to investigate the influence of gravity gradiometer instrument (GGI), gyroscope, and accelerator on navigation precision, simulation program of gravity gradient aided inertial navigation system is established in this paper. The detailed mathematical model of gravity gradient aided navigation system is given. Simulation results under Matlab environment prove that remarkably promotion of navigation...
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