THE DEVELOPMENT OF A SELENOCENTRIC SATELLITE SIMULATION NAVIGATION SYSTEM BY MEANS OF THE LUNAR SURFACE MODEL

2020 ◽  
Author(s):  
Alexey Andreev ◽  
Natalya Demina ◽  
Rene Hudec ◽  
Leonid Nefediev ◽  
Yury Nefedyev
Keyword(s):  
Lunar Surface ◽  
Navigation System ◽  
Surface Model

Optimizing the Beacon Positions on the Lunar Surface in a Radio Navigation System

2021 ◽  
Vol 41 (8) ◽  
pp. 759-761
Author(s):  
E. V. Akimov ◽  
S. Yu. Bakharev ◽  
D. A. Kozorez ◽  
D. M. Kruzhkov
Keyword(s):  
Lunar Surface ◽  
Navigation System ◽  
Radio Navigation ◽  
Radio Navigation System

scholarly journals VISUAL-BASED INTEGRATED NAVIGATION SYSTEM APPLIED TO A SIMULATION OF LUNAR MODULE LANDING

2020 ◽  
Vol XLIII-B1-2020 ◽  
pp. 305-313
Author(s):  
C. T. Kuo ◽  
Y. T. Tien ◽  
K. W. Chiang
Keyword(s):  
Lunar Surface ◽  
Navigation System ◽  
Poor Performance ◽  
Initial Position ◽  
Relative Navigation ◽  
Integrated Navigation ◽  
Space Technology ◽  
Integrated Navigation System ◽  
Lunar Landing ◽  
Landing Module

Abstract. With the development of space technology, more and more lunar researches are performed by different countries. For the lunar landing mission success, the lunar landing module should equip with advanced Positioning and Orientation System (POS) for the navigation requirements. For the pinpoint landing mission formulated by NASA, a good POS with error less than 100 meters is needed in order to make the lunar module land safely at the exact destination on lunar surface. However, the existing technologies for lunar navigation, such as satellite positioning and star tracker, have poor performance for the navigation requirements. The visual-based positioning technology is an alternative way to make sure a lunar landing module reaches the destination. There are two types of visual-based positioning technology, absolute and relative navigation. The relative navigation system can provide the solution at a higher rate, but the error would accumulate over time. On the contrary, the absolute navigation could provide an initial position or updates of position and attitude for relative navigation. Thus, the integrated navigation system from those two methods can take advantage of both stand-alone systems. On the other hand, the Inertial Navigation System (INS) can help it overcome the disadvantage that the images much closer to the lunar surface are not available. This study shows an integrated navigation system that integrates a visual-based navigation system and an INS, which is implemented in a simulated lunar surface.

A navigation system for shoulder arthroscopic surgery

2007 ◽  
Vol 221 (7) ◽  
pp. 801-812 ◽  
Author(s):  
K Tyryshkin ◽  
P Mousavi ◽  
M Beek ◽  
R E Ellis ◽  
D R Pichora ◽  
...  
Keyword(s):  
Navigation System ◽  
Shoulder Arthroscopy ◽  
Dimensional Space ◽  
Arthroscopic Surgery ◽  
Three Dimensional ◽  
Surgical Instruments ◽  
Surface Model ◽  
Ultrasound Images ◽  
Computed Tomography Images ◽  
Three Dimensional Models

The general framework and experimental validation of a novel navigation system designed for shoulder arthroscopy are presented. The system was designed to improve the surgeon's perception of the three-dimensional space within the human shoulder. Prior to surgery, a surface model of the shoulder was created from computed tomography images. Intraoperatively optically tracked arthroscopic instruments were calibrated. The surface model was then registered to the patient using tracked freehand ultrasound images taken from predefined landmark regions on the scapula. Three-dimensional models of the surgical instruments were displayed, in real time, relative to the surface model in a user interface. Laboratory experiments revealed only small registration and calibration errors, with minimal time needed to complete the intraoperative tasks.

scholarly journals Dual-Satellite Lunar Global Navigation System Using Multi-Epoch Double-Differenced Pseudorange Observations

Aerospace ◽  
2020 ◽  
Vol 7 (9) ◽  
pp. 122
Author(s):  
Toshiki Tanaka ◽  
Takuji Ebinuma ◽  
Shinichi Nakasuka
Keyword(s):  
Digital Elevation Model ◽  
Lunar Surface ◽  
Navigation System ◽  
Satellite Navigation ◽  
Navigation Systems ◽  
Position Accuracy ◽  
Digital Elevation ◽  
Navigation Algorithms ◽  
Global Navigation ◽  
Elevation Model

In view of the upcoming missions to obtain resources from the lunar surface, it is essential to have highly-accurate navigation systems to locate surface vehicles in shadowed regions. In response, we propose a dual-satellite lunar navigation system that is based on a multi-epoch double-differenced pseudorange observations (MDPO) algorithm. We used multi-epoch observations in a new way that reduces the number of navigation satellites required. In addition, the double-differenced pseudorange is used in order to eliminate the bias effects of the satellite and user clocks that conventional dual-satellite navigation algorithms did not fully take into account. Furthermore, a pre-known lunar digital elevation model is used to reduce the number of observations. The theoretical behavior of the MDPO algorithm was confirmed by simulation and the results indicate that user position accuracy can be several tens of meters with 95% probability (2drms) within a one-minute observation.

scholarly journals Interactive 3D Navigation System for Image-guided Surgery

2009 ◽  
Vol 8 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Huy Hoang Tran ◽  
Kiyoshi Matsumiya ◽  
Ken Masamune ◽  
Ichiro Sakuma ◽  
Takeyoshi Dohi ◽  
...  
Keyword(s):  
Navigation System ◽  
High Speed ◽  
3D Structure ◽  
Three Dimensional ◽  
Surgical Instruments ◽  
Surface Model ◽  
Surface Rendering ◽  
3D Navigation ◽  
Registration Method ◽  
Interactive 3D

This paper presents a novel surgery navigation system based on a three-dimensional (3D) imaging technique, integral videography (IV). In our system, the 3D structure of the object of interest is reconstructed using surface rendering and corresponding pixel distribution methods. We developed a high-speed algorithm that renders high-quality IV images from the surface model in real time and allows interactions like rotating and scaling to be done smoothly. Using the patient-image registration method, IV images can be displayed with the correct size and relative position with respect to the surgical instruments. Experiments were carried out with various anatomical models, and the results show that our system could be useful in many clinical situations such as orthopedic surgery and neurosurgery.

THE CASE FOR A COHESIVE LUNAR SURFACE MODEL*

1965 ◽  
Vol 123 (2) ◽  
pp. 671-710 ◽  
Author(s):  
J. D. Halajian
Keyword(s):  
Lunar Surface ◽  
Surface Model
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