scholarly journals Autonomous Navigation Airborne Forward-Looking SAR High Precision Imaging with Combination of Pseudo-Polar Formatting and Overlapped Sub-Aperture Algorithm

2013 ◽  
Vol 5 (11) ◽  
pp. 6063-6078 ◽  
Author(s):  
Xueming Peng ◽  
Yanping Wang ◽  
Wen Hong ◽  
Weixian Tan ◽  
Yirong Wu
Keyword(s):  
High Precision ◽  
Autonomous Navigation ◽  
Forward Looking

Autonomous Navigation of Mobile Robot Based on Flood Fill Algorithm

2016 ◽  
Vol 12 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Ayad Jabbar
Keyword(s):  
Mobile Robot ◽  
Real Time ◽  
Video Streaming ◽  
High Precision ◽  
Autonomous Navigation ◽  
Human Interaction ◽  
Live Video ◽  
Point To Point ◽  
Flood Fill ◽  
Client Device

The autonomous navigation of robots is an important area of research. It can intelligently navigate itself from source to target within an environment without human interaction. Recently, algorithms and techniques have been made and developed to improve the performance of robots. It’s more effective and has high precision tasks than before. This work proposed to solve a maze using a Flood fill algorithm based on real time camera monitoring the movement on its environment. Live video streaming sends an obtained data to be processed by the server. The server sends back the information to the robot via wireless radio. The robot works as a client device moves from point to point depends on server information. Using camera in this work allows voiding great time that needs it to indicate the route by the robot.

Application of Underwater Passive Landmarks for Autonomous Unmanned Underwater Vehicles Navigation

2020 ◽  
Vol 28 (3) ◽  
pp. 95-108
Author(s):  
A.I. Mashoshin ◽  
◽  
I.V. Pashkevich ◽  
Keyword(s):  
High Precision ◽  
Navigation System ◽  
Autonomous Navigation ◽  
Underwater Vehicles ◽  
Unmanned Underwater Vehicles ◽  
Autonomous Navigation System

The article describes the design of passive underwater landmarks (PUL) and their use for navigation of autonomous unmanned underwater vehicles (AUV). The procedure of AUV observation using PUL is considered. It is shown that with proper maneuvering of the AUV during observation, the accuracy of determining its coordinates is limited only by the accuracy of the PUL positioning during installation. This accuracy also affects the distance between neighboring PULs installed along the AUV’s route. If the AUV is equipped with a high-precision autonomous navigation system, the PULs can be installed at the intervals of several hundred kilometers.

Model of an alternative navigation system for high-precision weapons

2020 ◽  
pp. 154851292092195 ◽  
Author(s):  
Vitalii Savchenko ◽  
Volodymyr Tolubko ◽  
Liubov Berkman ◽  
Anatolii Syrotenko ◽  
Pavlo Shchypanskyi ◽  
...  
Keyword(s):  
High Precision ◽  
Global Positioning System ◽  
Navigation System ◽  
Autonomous Navigation ◽  
Least Squares Method ◽  
Positioning System ◽  
Navigation Systems ◽  
Navigation Support ◽  
Global Positioning ◽  
Global Navigation Systems

The article explores the problem of alternative navigation support for high-precision weapons that use guidance based on signals from global navigation systems. It proposes the use of an autonomous navigation system replacing satellite navigation in the case where major Global Positioning System-like systems are unavailable. It suggests the idea and the model of a moving navigation field that can move along the weapon trajectory. The model of accuracy for the pseudolite navigation system uses the least squares method as its basis. The study looks into the accuracy parameters of the moving navigation field. The results of the study show the advantages of a moving field when compared with a stationary navigation field in case of autonomous use. This research also shows the possibility of using an autonomous system for Special Forces, search and rescue operations, and robotic and unmanned aerial, ground, and sea-based vehicles.

High-Precision Navigation Approach of High-Orbit Spacecraft Based on Retransmission Communication Satellites

2012 ◽  
Vol 65 (2) ◽  
pp. 351-362 ◽  
Author(s):  
Wen YongZhi ◽  
Zhang ZeJian ◽  
Wu Jie
Keyword(s):  
High Precision ◽  
Navigation System ◽  
Autonomous Navigation ◽  
Satellite Navigation ◽  
Technical Support ◽  
Spacecraft Navigation ◽  
Autonomous Rendezvous ◽  
High Orbit ◽  
Rendezvous And Docking ◽  
Navigation Method

Many countries have presented new requirements for in-orbit space services. Space autonomous rendezvous and docking technology could speed up the development of in-orbit spacecraft and reduce the threat of increasing amounts of space debris. The purpose of this paper is to provide real-time high-precision navigation data for high-orbit spacecraft, thus reducing the cost of ground monitoring for high-orbit spacecraft autonomous rendezvous operations, and to provide technical support for high-orbit spacecraft in-orbit services. This paper proposes a new high-orbit spacecraft autonomous navigation approach, based on a communication satellite transmitting ground navigation signals. It proposes an overall navigation system design, sets up the system information integration model and analyses the precision of the navigation system by simulation research. Through simulation of this navigation method, the positional precision of a spacecraft at an altitude of 40 000 km, can be within 2·6 m with a velocity precision of 0·0011 m/s. The transponding satellite navigation method greatly reduces the development costs by using communication satellites in high-orbit spacecraft navigation instead of launching special navigation satellites. Moreover, the signals of transponding satellite navigation are generated on the ground, which is very convenient and cost-effective for system maintenance. In addition, placing atomic clocks on the ground may also help improve the clock accuracy achieved. In this study, the satellite-based navigation method is for the first time applied in high-orbit spacecraft navigation. The study's data could improve the present lack of effective high-orbit spacecraft navigation methods and provide strong technical support for autonomous rendezvous and docking of high orbital spacecraft, as well as other application fields.

scholarly journals High-Precision Heading Determination Based on the Sun for Mars Rover

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Yinhu Zhan ◽  
Shaojie Chen ◽  
Donghan He
Keyword(s):  
High Precision ◽  
Autonomous Navigation ◽  
Atomic Clock ◽  
Field Tests ◽  
Large Field ◽  
The Sun ◽  
Mars Rover ◽  
Safe Driving ◽  
Sun Sensor ◽  
Major Factors

Since the American Mars Exploration Rover Opportunity landed on Mars in 2004, it has travelled more than 40 km, and heading-determination technology based on its sun sensor has played an important role in safe driving of the rover. A high-precision heading-determination method will always play a significant role in the rover’s autonomous navigation system, and the precision of the measured heading strongly affects the navigation results. In order to improve the heading precision to the 1-arcminute level, this paper puts forward a novel calibration algorithm for solving the comparable distortion of large-field sun sensor by introducing an antisymmetric matrix. The sun sensor and inclinometer alignment model are then described in detail to maintain a high-precision horizon datum, and a strict sun image centroid-extraction algorithm combining subpixel edge detection with circle or ellipse fitting is presented. A prototype comprising a sun sensor, electronic inclinometer, and chip-scale atomic clock is developed for testing the algorithms, models, and methods presented in this paper. Three field tests were conducted in different months during 2017. The results show that the precision of the heading determination reaches 0.28–0.97′ (1σ) and the centroid error of the sun image and the sun elevation are major factors that affect the heading precision.

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