Abstract:
Copyright © SGEM WORLD SCIENCE (SWS) Society 2020. This work focuses on the creation of a selenocentric satellite simulation navigation system (SSSNS) using a set of reference objects on the lunar surface. The latter is based on the data from the modern space missions "LRO", "Clementine", "GRAIL"(all - NASA, USA), "SELENE"(JAXA, Japan), and "SMART-1"(European Space Agency). The SSSNS was created to transform measurements taken from in-orbit satellite into the selenocentric inertial reference system. The measurements should be taken by on-board altimeter and laser interferometer. The reliability assessment of the data produced is performed by the methods of regression simulation. The transformation procedures for the coordinate systems also include photogrammetric referencing of an in-orbit satellite to the reference objects and the accuracy assessment of the lunar surface digital maps. As a result, it was determined that the cartographic support for the near side of the Moon is more accurate compared to the far one. The difference was found to be up to 7 km. The highest accuracy is provided by synthetic coordinates, i.e. the ones obtained by combining satellite and ground-based observations. Our studies show that various systems of lunar maps are not equally accurate and differ in reference systems. The SSSNS might be used not only for the Moon. Introducing the changes to the system of main parameters of the simulation model, one may apply it to other celestial bodies too. The estimation of data produced is performed by means of the adaptive regression modeling. The accuracy of coordinate referencing of an object observed on the lunar surface is ±40 m in plane coordinates, the accuracy of radius vector is ±80 m. Currently, the estimated landing ellipse is 9×13 km. The use of the theoretical digital simulation model (DSM) of orbital referencing of lunar objects optical observations will therefore allow reducing the size of the landing ellipse by several orders of magnitude. The analysis of the method for creating a navigation network in the lunar orbit has shown that the modern selenographic models are not equally accurate and the data presented in these models refer to different reference systems. The simulation model of coordinate support allows to perform modeling for the determination of navigation positions of the desired objects on the Moon's surface using on-board goniometrical measurements with laser interferometer from the board of the spacecraft and the spacecraft itself using the measurements from the surface of the Moon. The results produced will be applied for determining selenographic parameters for lunar bases and also for preparing and implementing lunar space missions. The SSSNS could also be used for the robotic exploration of Mars and its moons.
