Improvement of batch TRN using mean removal and two step search method for lunar lander

Author

Ku, Pyung Mo ; Park, Young Bum ; Park, Chan Gook

Author_Institution

Department of Mechanical and Aerospace Engineering/ASRI, Seoul National University, South Korea

fYear

2015

fDate

May 31 2015-June 3 2015

Firstpage

1

Lastpage

6

Abstract

In this paper, to reduce batch process TRN (Terrain Relative Navigation) correlation problem caused by large position errors and for the improvement of computational effort, MRT (Mean Removal technique) and two step search methods are applied for lunar lander. MRT is the method subtracting the mean of both the measurement and DEM profile is applied. And two step search is the method using overall coarse and partially fine DEM. To meet position accuracy for precise lunar landing, a lunar navigation is operated by combination of INS (Inertial Navigation System) and TRN using altimeter, LIDAR etc. Until altimeter and LIDAR are operated, kilometers of cumulative errors caused by INS with time occur. Since these position errors induce bad correlation with measured terrain height profile and DEM (Digital Elevation Map) profile and cause wrong position fix, TRN considering large position error should be studied. By using MRT and two step search method, improvement of TRN position correction is shown in simulation.

Keywords

Batch production systems; Correlation; Extraterrestrial measurements; Moon; Sea measurements; Search methods; Vehicles; DEM fusion; Initial position error; MRT; Terrain Relative Navigation (TRN);

fLanguage

English

Publisher

ieee

Conference_Titel

Control Conference (ASCC), 2015 10th Asian

Conference_Location

Kota Kinabalu, Malaysia

Type

conf

DOI

10.1109/ASCC.2015.7244677

Filename

7244677