scholarly journals Design of Detection-Jamming Shared Waveform Based on Virtual Force Field Algorithm

2021 ◽  
Author(s):  
GuoMiao Xiong ◽  
Yunpeng Li ◽  
Chao Chen
Keyword(s):  
Force Field ◽  
Pulse Repetition Frequency ◽  
Poor Performance ◽  
Characteristic Parameter ◽  
Electronic Warfare ◽  
Signal Waveform ◽  
Virtual Force ◽  
Highly Sensitive ◽  
Optimum Detection ◽  
Deceptive Jamming

Due to the technical barriers between radars and jammers and the poor performance of the traditional detection-jamming shared signal in integrated radar-electronic warfare systems, a new detection-jamming shared signal waveform based on the virtual force field algorithm (VFFA) is proposed in this paper. First, a multi-objective and multi-dimensional characteristic parameter optimization model, based on a virtual force field, is established, and then the design principle of the shared signal is presented in detail. The simulation results show that the detection-jamming shared signal based on the VFFA presents the deceptive jamming of multiple false targets in non-collaborative radar. Further, there is better detection performance with the advantages of multiple pulse repetition frequency (PRF) and pulse accumulation number, which are highly sensitive to the multi-jagged PRF signals emitted by the non-collaborative radar. According to the VFFA described in this paper, the optimum detection-jamming shared signal waveform can be output in real time for specific free space targets, to improve the efficiency of integrated radar and electronic warfare systems.

Virtual Force Field Integrated with Human Avoiding Obstacles Strategies for Robot

2009 ◽  
Vol 16-19 ◽  
pp. 1071-1076 ◽  
Author(s):  
Ying Lian Jin ◽  
Bin Rui Wang
Keyword(s):  
Force Field ◽  
Virtual Environment ◽  
Repulsive Force ◽  
Uncertainty Reasoning ◽  
Virtual Force ◽  
Moving Direction ◽  
Computing Method ◽  
Indoor And Outdoor

Humanoid strategies of avoiding obstacles were analyzed and formulated into virtual force field (VFF) algorithm. In view of obstacles moving, smoothing accumulation computing method was designed for updating credibility factors (CF) of grid held by obstacle, and two examples were given. Uncertainty reasoning was adopted for computing complex CF with uncertainty of sensors signal, and synthesize method was designed. The weight of repulsive force was designed to be varying with angle from robot moving direction to obstacles, in order to make robot more sensitivity to obstacles on moving way. Indoor and outdoor virtual environment were established and simulations were carried out. The results demonstrate that the path is better using proposed than common VFF.

scholarly journals White noise jammer mathematical modelling and simulation

2020 ◽  
pp. 154851292096222
Author(s):  
Theodoros G Kostis
Keyword(s):  
Mathematical Modelling ◽  
White Noise ◽  
Pulse Repetition Frequency ◽  
Basic Function ◽  
Electronic Warfare ◽  
Radar Systems ◽  
Modelling Techniques ◽  
Mathematical Modelling And Simulation ◽  
Radar Equation

The radar equation is the fundamental mathematical model of the basic function of a radar system. Moreover, there are many versions of the radar equation, which correspond to particular radar operations, like low pulse repetition frequency (PRF), high PRF, or surveillance mode. In many cases, all these expressions of the radar equation exist in their combined forms, giving little information to the actual physics and signal geometry between the radar and the target involved in the process. In this case study, we divide the radar equation into its major steps and present a descriptive mathematical modelling of the radar and other related equations utilizing the free space loss and target gain concepts to simulate the effect of a white noise jammer on an adversary radar. We believe that this work will be particularly beneficial to instructors of radar courses and to radar simulation engineers because of its analytical block approach to the main equations related to the fields of radar and electronic warfare. Finally, this work falls under the field of predictive dynamics for radar systems using mathematical modelling techniques.

1D virtual force field algorithm for reflexive local path planning of mobile robots

2014 ◽  
Vol 50 (20) ◽  
pp. 1429-1430 ◽  
Author(s):  
Tok‐Son Choe ◽  
Jin‐Bae Park ◽  
Sang‐Hyun Joo ◽  
Yong‐Woon Park
Keyword(s):  
Path Planning ◽  
Force Field ◽  
Mobile Robots ◽  
Local Path Planning ◽  
Virtual Force ◽  
Local Path

Application of Virtual Environments to Assessment of Human Motor Learning During Reaching Movements

2009 ◽  
Vol 18 (2) ◽  
pp. 112-124 ◽  
Author(s):  
Ali Asadi Nikooyan ◽  
Amir Abbas Zadpoor
Keyword(s):  
Force Field ◽  
Force Fields ◽  
Physical World ◽  
Reaching Movements ◽  
Viscous Force ◽  
Virtual Object ◽  
Learning Mechanisms ◽  
Reaching Task ◽  
Third Phase ◽  
Virtual Force

This paper studies learning of reaching movements in a dynamically variable virtual environment specially designed for this purpose. Learning of reaching movements in the physical world has been extensively studied by several researchers. In most of those studies, the subjects are asked to exercise reaching movements while being exposed to real force fields exerted through a robotic manipulandum. Those studies have contributed to our understanding of the mechanisms used by the human cognitive system to learn reaching movements in the physical world. The question that remains to be answered is how the learning mechanism in the physical world relates to its counterpart in the virtual world where the real force fields are replaced by virtual force fields. A limited number of studies have already addressed this question and have shown that there are, actually, quite a number of relationships between the learning mechanisms in these two different environments. In this study, we are focused on gaining a more in-depth understanding of these relationships. In our experiments, the subjects are asked to guide a virtual object to a desired target on a computer screen using a mouse. The movement of the virtual object is affected by a viscous virtual force field that is sensed by the examinees through their visual system. Three groups of examinees are used for the experiments. All the examinees are first trained in the null-field condition. Then, the viscous force field is introduced either suddenly (for the two first groups) or gradually (for the last group). While the first and third groups of the examinees used their dominant arm to guide the virtual object in the second step, the second group used their nondominant arm. Generalization of the learning from the dominant to the nondominant arm and vice versa was studied in the third phase of the experiments. Finally, the force field was removed and the examinees were asked to repeat the reaching task to study the so-called aftereffects phenomenon. The results of the experiments are compared with the studies performed in the physical world. It is shown that the trends of learning and generalization are similar to what is observed in the physical world for a sudden application of the virtual force field. However, the generalization behavior of the examinees is somewhat different from the physical world if the force field is gradually applied.

Application of thermodynamics of systems in a force field to the equilibrium properties of real fluids. Basic relations for pure substances

1982 ◽  
Vol 47 (8) ◽  
pp. 2170-2179
Author(s):  
Emerich Erdös
Keyword(s):  
Force Field ◽  
Intermolecular Forces ◽  
Point Of View ◽  
External Force Field ◽  
Virtual Force ◽  
Statistical Mechanical ◽  
Pure Substances ◽  
The Common ◽  
Real Fluids ◽  
State Functions

The real fluid, between the molecules of which intermolecular forces are acting is regarded as an ideal fluid without molecular interaction situated in an external force field. A force potential is assigned to this virtual force field, and it is shown that all the equilibrium properties of real fluids can be expressed in terms of this virtual potential or/and of its derivatives. Equations are given, expressing the common state functions of pure substances as functions of the virtual potential. In addition, it is shown that close relationships do exist between the approach mentioned above and the known fundamental approaches, such as the dynamical and statistical-mechanical one. Therefrom it is evident that the approach proposed here represents an additional alternative for the description of equilibrium properties of fluids which is equivalent to the existing approaches from the formal point of view.

scholarly journals Modeling and Simulation for the Investigation of Radar Responses to Electronic Attacks in Electronic Warfare Environments

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
So Ryoung Park ◽  
Ilku Nam ◽  
Sanguk Noh
Keyword(s):  
Electromagnetic Wave Propagation ◽  
Tracking System ◽  
Characteristic Parameters ◽  
Tracking Errors ◽  
Electronic Warfare ◽  
Input Section ◽  
Simulation Scenario ◽  
Deceptive Jamming ◽  
Set Up ◽  
Angle Tracking

An electronic warfare (EW) simulator is presented to investigate and evaluate the tracking performance of radar system under the electronic attack situations. The EW simulator has the input section in which the characteristic parameters of radar threat, radar warning receiver, jammer, electromagnetic wave propagation, and simulation scenario can be set up. During the process of simulation, the simulator displays the situations of simulation such as the received signal and its spectrum, radar scope, and angle tracking scope and also calculates the transient and root-mean-squared tracking errors of the range and angle tracking system of radar. Using the proposed EW simulator, we analyze the effect of concealment according to the noise and signal powers under the noise jamming and also analyze the effect of deception by calculating errors between the desired value and the estimated one under the deceptive jamming. Furthermore, the proposed EW simulator can be used to figure out the feature of radar threats based on the information collected from the EW receiver and also used to carry out the electronic attacks efficiently in electronic warfare.

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