Use Of Satellite Navigation Systems Research Articles

Methodology for Modeling and Evaluating the Effectiveness of the Joint Use of Satellite Navigation Systems for Supporting Troop (Force) Groupings

Methodology for Modeling and Evaluating the Effectiveness of the Joint Use of Satellite Navigation Systems for Supporting Troop (Force) Groupings

Ефективність методики навчання спортивному орієнтуванню курсантів спеціальності артилерійська розвідка з урахуванням змагальної діяльності спортсменів-орієнтувальників

Success in a modern fast-paced and maneuverable battle requires the use of high-precision weapons, the effectiveness of which is possible with the use of satellite navigation systems, unmanned aerial vehicles, etc. At the same time, the experience of combat operations on the territory of Ukraine has shown that even if they cannot be used, and sometimes even in their absence, the ability to navigate with a conventional map is an important condition for the successful completion of a combat mission. The purpose of the study is to experimentally investigate the effectiveness of the methodology for teaching orienteering to cadets majoring in artillery intelligence, taking into account the requirements of competitive activity in the conditions of real training and competitive process of orienteering athletes. Material and methods of the research. To solve the tasks, we organized and conducted a pedagogical observation to determine the arsenal of means and methods of physical training of orienteering cadets in the process of studying at a military university and a pedagogical experiment to test the effectiveness of the physical training program for cadets majoring in artillery intelligence. There were 20 respondents, including 10 men of the artillery intelligence specialty with a minimum level of orienteering training (EO) and 10 male athletes who have been involved in orienteering for 2–3 years. The respondents are 18-25 years old (average age – 20.8±0.2). Results. It has been established that during the experiment there was a significant increase in the cadets’ fitness indicators compared to the beginning of the study. At the end of the study, the level of training of artillery cadets differs from athletes of the KMU and MSU level at a distance (sprint in the city by 28.9 %; sprint in the park by 37.7 %; extended distance in the forest by 26.4 %). Conclusions. The conducted research and analysis of the results showed that the level of preparedness of cadets specializing in artillery reconnaissance was significantly reduced compared to the beginning of the training process. At the end of the experiment, the training process was aimed more at developing endurance than at developing speed, which is important for performing tasks in real combat operations, and the cadets’ technical skills in map reading, which is necessary for their specialty of artillery reconnaissance, increased.

Modeling the influence of external influences on the process of automated landing of a UAV-quadcopter on a moving platform using technical vision

This article describes a series of experiments in the Gazebo simulation environment aimed at studying the influence of external weather conditions on the automatic landing of an unmanned aerial vehicle (UAV) on a moving platform using computer vision and a previously developed control system based on PID and polynomial controllers. As part of the research, methods for modeling external weather conditions were developed and landing tests were carried out simulating weather conditions such as wind, light, fog and precipitation, including their combinations. In all experiments, successful landing on the platform was achieved; during the experiments, landing time and its accuracy were measured. The graphical and statistical analysis of the obtained results revealed the influence of illumination, precipitation and wind on the UAV landing time, and the introduction of wind into the simulation under any other external conditions led to the most significant increase in landing time. At the same time, the study failed to identify a systemic negative influence of external conditions on landing accuracy. The results obtained provide valuable information for further improvement of autonomous automatic landing systems for UAVs without the use of satellite navigation systems.

Optimization of an aircraft flight trajectory in the GLONASS dynamic accuracy field

The authors consider the problem of optimization of aircraft flight trajectories in air traffic management (ATM) on the basis of flexible routing technologies which involve the use of satellite navigation systems (SNS). It is shown that in optimizing a trajectory it is necessary to take into account the accuracy of track holding during the flight which depends on the accuracy of the navigation system and external flight path disturbances, e.g. wind. For solving the task of optimization the authors propose to use the theory of graphs. The technique of constructing a dynamic SNS accuracy field and representing it as a graph was developed. It is proposed that the SNS field be characterized by geometric dilution of precision changing both in space and in time. Based on the theory of graphs (A-star algorithm) the technique of constructing a trajectory of optimal length with changing the SNS accuracy and external flight path disturbances is proposed. The criterion of optimization based on minimizing the true track is offered. The cost function taking into account the track holding accuracy in navigating by SNS and effects of external flight disturbances is justified. The article presents the results of A-star algorithm application for constructing an optimal flight trajectory under conditions of SNS accuracy field variation and presence of prohibited zones in the provided airspace.

Algorithms for aircraft track optimization in flexible routing

The authors consider the problem of optimization of aircraft flight tracks in air traffic management (ATM) on basis of flexible routing technologies which involve the use of satellite navigation systems (SNS). It is shown that in optimizing a trajectory it is necessary to take into account the accuracy of track holding in flight which depends on accuracy of the navigation system and external flight path disturbances, e.g. wind. For solving the problem of optimization the authors propose to use the theory of graphs. The technique of constructing a dynamic SNS accuracy field and representing it as a graph was developed. It is proposed that the SNS field could be characterized by geometric dilution of precision changing both in space and in time. Based on the theory of graphs (A-star algorithm) the technique of constructing a trajectory of optimal length under conditions of SNS accuracy variations and external flight path disturbances is proposed. The criterion of optimization based on minimizing the true track is offered. The cost function taking into account the track holding accuracy in navigating by SNS and effects of external flight disturbances is justified. The article represents the results of A-star algorithm application for optimal flight track construction under conditions of SNS accuracy field variation and presence of prohibited zones in the provide zone of airspace

RATIONING OF FUEL CONSUMPTION WITH THE USE OF INFORMATION TECHNOLOGY

Introduction . One of the directions of expenses on motor transportations’ reduction is the usage of such document as «The regulations of the fuels’ and lubricants’ expenses on motor transport» approved by the Ministry of Transport of the Russian Federation. However, the normalization of fuel consumption is difficult due to the high probability of errors by the manual calculation. Currently, there is no methodology for determining the correction factors for taking into account the existing operating conditions for the stock of vehicles. Materials and methods . Full-scale studies of fuel consumption on the routes of motor transport with the use of satellite navigation systems for the purpose of collecting statistical data are carried out. Moreover, the specialized software product called «The fuel consumption calculator» is developed to reduce the complexity and improve the accuracy of calculations. Results . The collected statistics’ data allows to determine the real need of fuel and to estimate the discrepancy with pre-calculated fuel need according to Federal Standards. As a result, quantitative information is obtained and justified, which makes it possible to clarify the coefficients that take into account the operating conditions of vehicles in the calculation of fuel consumption. In addition, the usage of «The fuel consumption calculator « allows to improve the management culture, to simplify and accelerate the work of the enterprise staff with numerical data. Discussion and conclusion . It can be concluded that the confirmed researches prove that the fuel consumption calculation program allows to reduce the labor expenditures of the vehicles’ operators on the scheduling process of the fuel and money expenses for vehicles’ transportation work. It is also easier to determine the saving or overspending of fuel due to the results of vehicles’ work on the line. The program «The fuel consumption calculator « is introduced in JSC «Vyksa metallurgical plant», CJSC «Geostroy», CJSC “Dorstroyservice”. Control measurements with the use of satellite navigation systems also allow to specify correction factors and to increase validity of norms.

Synthesis of High-Precision Hydraulic Control Systems of an Excavator

Practical implementation of the program controlling the movement of the excavator’s working tool (including the use of satellite navigation system) imposes stringent requirements on the dynamic and static accuracy of automatic control systems for the hydraulic excavator’s operating mechanisms, in conditions of non-stationary parameters of these mechanisms as control objects. The authors describe the effective solution of this problem by implementing structural synthesis of each servo hydraulic drive as a multi-loop system with one measured coordinate (MLSOMC). The EO-4121 excavator with four hydraulic drives (rotary platform, boom, arm and ladle) was used as an example to demonstrate that the implementation of three circuits in the multi-loop system with one measured coordinate in each of these drives with typical PID-controllers allows to ensure the robustness of the ACS for known uncertainties, as well as the required rates of control quality in static and dynamic modes.

Methods of Improving the Jamming Resistance of GNSS Receiver

Abstract Jamming of GNSS signals can be both a consequence of accidental activities and an intentional act. This issue is lately discussed as an essential threat for the use of satellite navigation systems. This is especially dangerous in the face of common usage of GPS - like systems in everyday life and the great belief of everyday users in the truth of devices indications. In spite of the legal prohibition of using them, jammers are commonly accessible, especially in the Internet. Until recently even specialists have shared the conviction that the broadband GPS signal is not a subject of disturbances in contrast to older wireless communication techniques because its power level is below natural level of noises and in addition it is randomly coded. But nowadays jammers are very often successfully applied, which is confirmed in many reports. The average user has not the suitable knowledge about the specificity of the jamming and has no technical possibilities of the detection of jammer signals. Receivers, which can indicate the presence of perturbative signals, became accessible a few months ago only. Presently accessible jamming monitors can also determine the direction of interferer signal transmission. There are also specially designed receivers with anti-jamming mechanism, which are, however, not commonly accessible. The possible way of countermeasure the jamming in the GNSS receiver are discussed in this paper.

MANOBRAS DE SEMEADURA COM SISTEMA DE NAVEGAÇÃO

Resumo Os sistemas de navegação por posicionamento global (GPS) estão cada vez mais presentes no campo, prometendo diminuir os custos operacionais do agricultor. O objetivo deste trabalho foi avaliar o tempo de manobra durante a operação de semeadura da soja sem e com sistema de navegação. O delineamento experimental foi inteiramente aleatorizado, com dois tratamentos e doze repetições. Os tratamentos consistiram no tempo das manobras feitas de modo convencional e utilizando-se do sistema de navegação por GPS acoplado num piloto automático. Avaliaram-se o tempo de manobra e o retorno econômico. As manobras realizadas com auxílio do sistema de navegação foram, em média, 49% mais rápidas do que as manobras realizadas de forma convencional. Houve economia de R$ 4,15 por hectare, em áreas com comprimento médio das passadas de 800 metros. No caso de áreas menores, com comprimento de 50 metros, esta economia chegou a R$ 19,90 por hectare. Concluiu-se que o uso de sistema de navegação por satélites, em conjunto com piloto automático, pode gerar economia significativa de tempo e no custo operacional da semeadura.

Motion control of a wheeled tractor with the use of satellite navigation systems

The article presents a developed electromechanical motion control system for wheeled tractors using GPS and GLONASS satellite navigation systems, a transmission system of differential corrections of the satellite signal, the results of laboratory and field tests of the control system.

Use of satellite navigation systems for transport monitoring

Principles of operation and structure of a typical transport monitoring system with using satellite navigation systems were adduced. The main trends in the development satellite monitoring of transport systems were viewed.

An estimate of the accuracy of object positioning using the mobile communications infrastructure

An estimate of the limit accuracy and the possible construction of an autonomous object positioning system using the mobile communications infrastructure (relay towers, cellphones, and additional measuring systems) without constantly making use of satellite navigation systems are presented. It is shown that, using such a system, one can determine the position of objects with an error of 10–20 mm.

Land vehicle use of satellite navigation systems in Japan

Abstract In terms of land users of the US Global Positioning System (GPS), the Japanese market is the most mature in the world. As such, it provides the ‘blueprint’ for how mass markets in other developed countries will respond to GPS and, in the future, to the second generation Global Navigation Satellite System (GNSS-2). The information which follows draws on a recent report prepared by Logica for the UK government, and highlights the growth of the in-car navigation market in Japan and the various technologies being used.