Short-range Navigation Systems Research Articles

Human Detection and Avoidance Control Systems of an Autonomous Vehicle

A long-range and short-range navigation systems of an autonomous vehicle are the most important thing to develop because it is very complex and related to safety in the driving of an automatic vehicle. The purpose of this research is to develop a short-range navigation system for autonomous vehicles focused to detect and avoid humans which implemented on an autonomous vehicle prototype. Image Processing and deep learning algorithm used for human detection and ultrasonic sensor used for distance calculation. Decision making for human avoidance system using the Fuzzy algorithm based on the position of detected human and human distance. The implemented system has a success rate of 85.71% to avoid human which ideal distance more than 2 meters. The implemented prototype of an autonomous vehicle can be implemented in the real vehicle with some adjustments in the sensor and hardware system, however, the systems are expected to reduce traffic accidents caused by human error.

Research of accuracy characteristics of measurement of coordinates in the ground-based radionavigation system based on pseudosatellites

The issues of measurement accuracy of coordinates in the short-range navigation system based on pseudosatellites are considered in the article. The analysis of the errors components the of measurement of radio-navigation parameters is given, the values of the geometrical factor are calculated for various options of system constructing

Simulation of short-range navigation system based pseudolites and investigation of its accuracy characteristics

This papers considers a laboratory complex for studying the characteristics of short-range navigation system based pseudolites. The complex was built on the National Instruments hardware platform in the LabView programming environment. The complex is a real prototype of a navigation system based on pseudosatellites. It provides simulation of the navigation field, analysis of received signals, determination of signal characteristics and navigation parameters. The article presents the results of experimental studies of the complex with the aim of determining the error in pseudo-range measurements from the signals of navigational spacecraft and pseudosatellites.

Analyzing measurement errors for navigation parameters in onground short-range navigation systems based on pseudolites

This article discusses coordinate measurement errors in short-range pseudolite navigation systems. An analysis of the components of the measurement error of radio navigating parameters has been performed; the geometric factor values have been calculated for various variants of constructing the system. The peculiarities of measuring the spatial orientation of objects using interferometric methods in on-ground short-range navigation systems have been ascertained.

Short-range radio navigation systems: current status and prospects

The problems of the development of short-range navigation aids as integrated multifunctional systems for the near future while implementing them in poorly equipped regions, ice-breaker fleets, and on remote oil platforms are discussed. Conclusions are drawn about the reasonability of utilization for those purposes of various modifications of the existing integrated short-range navigation systems. These systems provide highly accurate operation, have a convenient rho - theta coordinate system, and are capable in some cases of providing the additional functions.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Area Navigation and the Associated Display Methods

It seems appropriate first to define and explain the term Area Navigation that lately has almost become a slogan in discussions on short-range radio navigation aids. The term itself does not convey much because virtually any radio navigation system permits navigation in the area of coverage of the associated ground stations; for a systematic classification of navigation systems, the term Area Navigation (herein called ANAV) is unsatisfactory. It can be understood only in the context of air traffic control requirements. For a long while the requirements of short-range navigation systems were almost exclusively governed by the needs of air traffic control systems based on an airways concept. When during recent years A.T.C. methods became less associated with a fixed route structure, especially in the terminal area, the requirements to be met by a navigation system changed accordingly. There now appears to be a general trend for area navigation capability to become available as a substitute for a point-to-point navigation system.