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When the satellite signal is blocked, the ground terminal cannot be accurately positioned because it cannot receive the satellite signal. In this case, it is necessary to study how to use other ways to achieve positioning and navigation. Inertial navigation inertial sensors to rely on sensing carrier acceleration and angular velocity, the position of the carrier can provide continuous in is not dependent...
Internet of Things (IoT) connects sensing devices to the Internet for the purpose of exchanging information. Location information is one of the most crucial pieces of information required to achieve intelligent and context-aware IoT systems. Recently, positioning and localization functions have been realized in a large amount of IoT systems. However, security and privacy threats related to positioning...
Star-sensor has an excellent capability of providing high accurate attitude, which depends on the accuracy of location to a large extent. At present, star-sensor is restricted by the accuracy of its location information which is normally given by Initial Navigation System, but this location information involves non-ignorable inaccuracy due to the accumulated error. In prior research, star-sensor needs...
Intelligent Transportation System (ITS) applications for integral and cooperative vehicle safety as well as some Advanced Driver Assistance Systems (ADASs) benefit from precise determination of relative positions between dynamic traffic objects. With conventional Global Navigation Satellite System (GNSS) measurements, e.g. using Global Positioning System (GPS), the required accuracy cannot be achieved...
There is an overwhelming dependence on Global Positioning System (GPS) in every sector, ranging from civil to military. The over dependence on GPS and its potential vulnerabilities has raised many concerns among government, scientists and all those who employ GPS for their business and other critical applications. It is due to the fact that GPS receivers can be easily be spoofed and the operations...
Low quality measurements cause performance degradation in global navigation satellite system (GNSS) high precision positioning techniques. Based on a real-time kinematic (RTK) technique that integrates measurements from different navigation constellations and signal frequencies, an algorithm that identifies and discards low quality measurements to ensure high carrier cycle integer ambiguity fix rate...
Accurate positioning is needed for agricultural vehicles now and in the future. Position is currently needed for mapping, precision farming, auto steering vehicles and for agro robotic solutions. Thus two kinds of errors is defined for GPS receivers such as relative accuracy and the absolute accuracy, which is measured positions to their real position. In this paper to overcome the above said problems...
This paper describes a novel method to design a simple real time GPS (Global Positioning System) receiver system for navigation, positioning and tracking applications. This system is developed to provide various positioning and navigational parameters like latitude, longitude, velocity, altitude, the name of the current location etc. This system also provides information regarding the satellites which...
In this paper, a peer-to-peer cooperative algorithm with fine/coarse time acquisition and positioning has been implemented on GPS software-defined receivers. The benefits of the aiding information are considered. Moreover, experimental results evaluate the computational and accuracy performance in the acquisition and positioning processes, respectively.
Terrain based situational awareness is carried out by armies for positioning of military combat units. Situational awareness can be assessed in various ways, but a weight-based analysis using thematic layers and other terrain inputs is a unique approach. An application using satellite imagery, to assess quantitatively the covering terrain, with focus on mountainous combat zones for positioning of...
Healthy life style has increased its penetration among people in the last years. The number of licenses for practicing snow and mountain activities certificates it with an over 7% increase year by year. Due to this, expert skiers or excursionist have slightly modified traditional patterns in their activities, moving from controlled zones, such as ski resorts or typical mountain paths, to non-protected...
This paper proposes a positioning method that combines GPS pseudoranges and WLAN ranges when less than four GPS satellites are within sight. To enhance the positioning availability, a tight hybridization approach with both technologies is considered. Although the work has been performed considering WLAN and GPS, most of the presented ideas, procedures and results are also valid for generic tight non-synchronized...
In recent years, with the occurrence of more and more natural disasters and emergencies, China has also been greatly affected by that without exception. Wireless communication technology is playing an important role in disaster and emergency management. In current applications, mobile communication network, as the main key technology, have been used to deal with disasters and emergencies. However,...
In this paper In this paper, which is one of the part of the development for the automation system in the navigation process, covers the car system. Local detection system based on pseudo-satellite was used to be able to detect the space coordinates and the absolute location with four ultrasonic transmitters and two receivers. Using this system we get the lateral dynamic model of a reduced car by...
The explosion of wireless sensor networks (WSNs) has given rise to the creation of new embedded operating systems and consequently to the associated simulation environments. Most of these environments are designed for testing applications that do not require node mobility and long distances between nodes. The design of WSNs has recently involved space applications. WSNs in space hold the promise to...
Double-sided rotating scan mirror is adopted by infrared camera of HJ-1B satellite as its imaging mode. With the support of knowledge for infrared camera, satellite ephemeris file and attitude file, a rigorous sensor model for infrared camera of HJ-1B is constructed. Meanwhile, in consideration of the positioning error caused by inaccuracy of ephemeris and attitude, an error reduction model used to...
This paper presents a flexible approach to ubiquitous positioning technologies on smart phone. It deploys three optional indoor/outdoor locating solutions based on Multi-sensor, Satellite, and Terrestrial positioning techniques. The solutions cover six locators including Integrated GPS (Global Positioning System), Bluetooth GPS, AGPS (Assisted GPS), Network based, Multi-sensors, and Wireless LAN (WLAN)...
The Institute of Navigation and Satellite Geodesy of the Graz University of Technology is involved in many projects and developments to determine GNSS-based trajectories for demanding applications. Examples demonstrating the capabilities and limits of GNSS-based positioning under detrimental conditions are: positioning and guidance of visually impaired pedestrians, search and rescue applications,...
Cross-country orienteering is a main game in orienteering. It is a new style athletic sport with full popularity, entertaining quality, knowledge as well as rivalrousness. By taking use of a map with some checkpoints and traverse lines and the north stabilized indicator, competitors choose the way to get the checkpoints one by one. The one who accomplish all the checkpoints with the shortest time...
One drawback with the simulation analysis and evaluation system of satellite navigation systempsilas service performance on positioning, velocity-measuring and timing is that it takes the analyzers too much time to run the simulation. A pc cluster based parallel simulation solution is proposed, using the analysis of global gridpsilas dilution of precision as an example. For load balancing, three schemes...
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