scholarly journals МЕТОД ДИНАМІЧНОГО ПРОГРАМУВАННЯ ЩОДО СИНТЕЗУ ВХІДНОГО ВИМІРЮВАЛЬНОГО СИГНАЛУ ДЛЯ КОНТРОЛЮ ТЕХНІЧНОГО СТАНУ РАДІОНАВІГАЦІЙНИХ КОМПЛЕКСІВ

2019 ◽  
pp. 57-63
Author(s):  
Олена Анатоліївна Дакі
Keyword(s):  
Dynamic Programming ◽  
Water Transport ◽  
Traffic Control ◽  
Complex Form ◽  
Technical State ◽  
Dynamic Programming Method ◽  
Navigation Systems ◽  
Radio Navigation ◽  
Measuring Signal ◽  
Method Of Dynamic Programming

The article shows that the use of modern navigation systems and complexes for controlling the movement of means of water transport makes it possible to ensure safe navigation. It is substantiated that the proper functioning of the means of navigation support – radio navigation complexes – depends on their technical condition. The work substantiates and investigates mathematical expressions for calculating the parameters of input measuring signals for controlling the technical state of radio navigation complexes. The results of the analysis of methods for determining the technical state of radio electronic devices are presented, based on studies of their dynamic characteristics. It has been shown that inertial units (elements) are used to increase the noise immunity coefficient of radio navigation complexes, which increases the time to control the harmonic signal of a sinus or cosine type. It is possible to avoid this disadvantage by using test signals with a normalized spectrum, representing the sum of a certain number of useful harmonics – test signals of complex form. The purpose of the article is to develop a method of dynamic programming for the synthesis of the input measurement signal for monitoring the state of the radio navigation complexes of the means of water transport. The obtained recurrence ratio can be used to determine the characteristics of a measuring signal in the case of continuous monitoring of the output signal. To do this, you need to replace the integral in the expression for the synthesis criterion with the corresponding integral sum. The method of dynamic programming when using personal computers in comparison with other methods has the advantage since it allows you to use a cyclic program in calculations. However, although in the dynamic programming method at each stage it is necessary to calculate and memorize only one function, with a considerable amount of coordinates (with a significant amount of control parameters and rather complex systems and complexes of navigation and traffic control of sea vessels), the volume of calculations can be very large.

scholarly journals МЕТОД РОЗРАХУНКУ ФУНКЦІЇ РОЗПОДІЛУ ПАРАМЕТРІВ КОНТРОЛЮ РАДІОНАВІГАЦІЙНИХ КОМПЛЕКСІВ ЗАСОБІВ ВОДНОГО ТРАНСПОРТУ

2019 ◽  
pp. 76-84
Author(s):  
Олена Анатоліївна Дакі
Keyword(s):  
Water Transport ◽  
Quantitative Characteristic ◽  
Technical Condition ◽  
Technical State ◽  
Navigation Systems ◽  
Automated Control ◽  
Radio Navigation ◽  
Accuracy Of Measurements ◽  
Navigation Equipment ◽  
Electronic Elements

The article shows that the use of modern navigation systems and complexes for controlling the movement of water transport vehicles allows for safe navigation. It is substantiated that the proper work of navigation equipment – radio navigation complexes – depends on their technical condition. Thus, the presence in the radio navigation complexes of water transport facilities of a large number of electronic elements and radio channels and the aggressive environment of their operation increase the role of methods and instruments for monitoring and diagnosing the technical state of the radio navigation complexes during operation to ensure the trouble-free operation of water transport facilities. In determining the technical state of the radio navigation complexes of water transport vehicles there is a known contradiction in the control of complex systems of control: the provision of a given reliability of information about the technical state of the radio navigation complexes of the movement of water transport means requires an increase in the volume and accuracy of measurements in assessing their characteristics on one side, on the other - methods for automating the process of synthesizing the measurement signals and processing feedback on them for this. Within this contradiction, the actual scientific problem is the development of methods for synthesizing measurement signals and processing reviews on them to increase the reliability and efficiency of automated control of the technical state of the radio navigation systems for controlling the movement of water transport vehicles. The purpose of this work is to develop a method for calculating the function of distribution of parameters of control of radio navigation complexes of water transport vehicles. The conditional distribution function is proposed, which is the main quantitative characteristic of the control of the radio navigation complexes of water transport facilities. This feature contains all the information about the control parameters and allows you to determine the technical state of the radio navigation complexes. The method of calculating the function of distribution of parameters of control of radio navigation complexes of water transport means is developed. Such a method is proposed to be used in substantiating the characteristics of the measuring signals of the control of the radio navigation complexes of the means of water transport during operation

scholarly journals МЕТОДИ СИНТЕЗУ ВИМІРЮВАЛЬНИХ СИГНАЛІВ З НОРМОВАНИМ СПЕКТРОМ

2019 ◽  
pp. 89-98
Author(s):  
Олена Анатоліївна Дакі
Keyword(s):  
Complex Systems ◽  
Water Transport ◽  
Traffic Control ◽  
Technical Condition ◽  
Technical State ◽  
Automated Control ◽  
Radio Navigation ◽  
Accuracy Of Measurements ◽  
Methods Of Synthesis ◽  
Radio Systems

It is known that the requirements for the efficiency and quality of carrying out operations for controlling the technical condition of complex systems are increasing due to the transfer of systems and objects to operation in a state of technical condition. In the article the presence in the practice of controlling the technical condition of complex systems of contradiction is considered, namely, the provision of the given reliability of information about the technical state of the radio navigation complexes of the traffic control of water transport means requires an increase in the volume and accuracy of measurements in evaluating their characteristics on the one hand, and on the other - the lack of methods for automating processes the synthesis of the measurement signals and processing feedback on them for this. Traditional measurement signals for monitoring the technical condition of radio systems are sinusoidal oscillations. However, this approach requires a considerable workload of control and leads to a reduction in the efficiency of its conduct due to the need to introduce inertial blocks to increase impedance protection. Avoid this disadvantage is possible due to the use of multi-frequency signals with a normalized spectrum - polyharmonic signals. They represent the sum of a certain number of useful harmonics, modulated signals with a normalized spectrum and different forms of binary signals. Therefore, the actual scientific problem is the development of methods of synthesis of polar harmonic measuring signals and processing of reviews on them to increase the reliability and efficiency of automated control of the technical condition of radio systems. According to the results of the analysis of measuring signals and known methods for the synthesis of measuring signals, the results of the study of the subject area, which include the study of the methods of synthesis of measuring signals with the normalized spectrum, are proposed in order to improve the process of automated control of the technical state of radio systems. In addition, features of the experimental verification of the obtained theoretical results and the development of recommendations for their implementation for the automated control of the technical state of the radio navigation complexes for controlling the movement of water transport vehicles are presented

Area Navigation and the Associated Display Methods

1971 ◽  
Vol 24 (1) ◽  
pp. 105-120
Author(s):  
Karl E. Karwath
Keyword(s):  
Traffic Control ◽  
Navigation System ◽  
Air Traffic Control ◽  
Short Range ◽  
Air Traffic ◽  
Navigation Systems ◽  
Systematic Classification ◽  
Radio Navigation ◽  
Radio Navigation System ◽  
Point To Point

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.

scholarly journals Modelling of optimum cascade of ideal mixing reactors

2017 ◽  
Vol 2 (20) ◽  
pp. 149-160
Author(s):  
German Efremov ◽  
Julia Geller
Keyword(s):  
Dynamic Programming ◽  
Residence Time ◽  
Order Reaction ◽  
Dynamic Programming Method ◽  
Minimum Volume ◽  
Single Application ◽  
First Order ◽  
Ideal Mixing ◽  
Minimum Residence Time ◽  
Method Of Dynamic Programming

It is discussed the using of dynamic programming method to optimize the parameters of the cascade of ideal mixing reactors, which is held isothermal first order reaction. It is found, that the minimum volume of the cascade of reactors corresponds to the minimum residence time of substance in this cascade. The optimum value of residence time for all reactors are equal and all ratio of input and output concentrations are equal, hence, and all volumes of reactors are also equal. A total volume of the cascade of reactors is less than the amount single. Application of the method of dynamic programming is illustrated with an example of the calculation of the polymerization in a cascade of four reactors according to the literature experimental data.

scholarly journals ALGORITHMS FOR FINDING OPTIMAL POLICY FOR INTELLIGENT AGENTS BASED ON MARKOV DECISION-MAKING PROCESSES

2018 ◽  
pp. 29-32
Author(s):  
A. V. Lachikhin
Keyword(s):  
Decision Making ◽  
Dynamic Programming ◽  
Optimal Policy ◽  
Intelligent Agents ◽  
Dynamic Programming Method ◽  
Multi Agent Systems ◽  
Markov Decision ◽  
Decision Making Processes ◽  
Multi Agent ◽  
Method Of Dynamic Programming

Currently, the paradigm of intelligent agents and multi-agent systems is actively developing. The policy of agents ‘ actions can be represented as a Markov decision-making process. Such agents need methods to develop optimal policies. The purpose of this study is to review existing techniques, determine the possibility and conditions of their application. The main approaches based on linear and dynamic programming are considered. The specific algorithms used to find the extreme value of utility are given. The method of linear programming - simplex method, and the method of dynamic programming method-iteration of values are considered. The equations necessary to find the optimal policy of intelligent agent actions are given. Restrictions of application of various algorithms are considered. Conclusions the most suitable method for finding the optimal policy is the iteration of values.

The influence of unintentional radio interference on the equipment operation quality of satellite radio navigation systems consumers

2020 ◽  
pp. 165-170
Keyword(s):  
Underlying Surface ◽  
Navigation Systems ◽  
Signal Attenuation ◽  
Radio Navigation ◽  
Equipment Operation ◽  
Atmospheric Noise ◽  
Detection Mode ◽  
Signal Mode ◽  
Cosmic Noise

The analysis an influence of reflections from the underlying surface, atmospheric noise, the Earth’s surface, cosmic noise and signal attenuation of the signal the atmosphere, as well as the flight dynamics of the aircraft (AC) on the signal/noise ratio and, accordingly, on the accuracy of AC navigation definitions by using consumer equipment of the satellite radio navigation systems. The analysis an influence of reflections from the underlying surface on the equipment operation quality of the satellite radio navigation systems consumers is carried out by using the Beckman model, in accordance with the earth’s surface appears to consist of flat faces with an arbitrary slope. It is noted that reflections from the underlying surface have a greater effect on the quality of functioning of the consumer equipment of the satellite radio navigation systems in the tracking signal mode than in the detection mode. In this case, the influence of reflections increases with decreasing flight altitude and an increase in the angle of heel of the AC in the direction of the navigation spacecraft.

scholarly journals Single-Manufacturer Multi-Retailer Supply Chain Models with Discrete Stochastic Demand

2021 ◽  
Vol 13 (15) ◽  
pp. 8271
Author(s):  
Yaqing Xu ◽  
Jiang Zhang ◽  
Zihao Chen ◽  
Yihua Wei
Keyword(s):  
Dynamic Programming ◽  
Supply Chain ◽  
Computational Complexity ◽  
Stackelberg Game ◽  
Programming Model ◽  
Dynamic Programming Method ◽  
Game Model ◽  
Chain Model ◽  
Stochastic Demands ◽  
Demand Models

Although there are highly discrete stochastic demands in practical supply chain problems, they are seldom considered in the research on supply chain systems, especially the single-manufacturer multi-retailer supply chain systems. There are no significant differences between continuous and discrete demand supply chain models, but the solutions for discrete random demand models are more challenging and difficult. This paper studies a supply chain system of a single manufacturer and multiple retailers with discrete stochastic demands. Each retailer faces a random discrete demand, and the manufacturer utilizes different wholesale prices to influence each retailer’s ordering decision. Both Make-To-Order and Make-To-Stock scenarios are considered. For each scenario, the corresponding Stackelberg game model is constructed respectively. By proving a series of theorems, we transfer the solution of the game model into non-linear integer programming model, which can be easily solved by a dynamic programming method. However, with the increase in the number of retailers and the production capacity of manufacturers, the computational complexity of dynamic programming drastically increases due to the Dimension Barrier. Therefore, the Fast Fourier Transform (FFT) approach is introduced, which significantly reduces the computational complexity of solving the supply chain model.

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