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Being as the pivot of avionics system, Flight Management System (FMS) plays an important role in flight planning, trajectory prediction, navigation and guidance of aircrafts. Aiming at researching the functions and validations of FMS, the advanced FMS simulation is constructed. Performance Based Navigation (PBN) and Trajectory Based Operation (TBO) require high-fidelity and high-accuracy data, of...
Modeling and simulation in the aviation community is characterized by specialized models built to solve specific problems. Some models are statistically-based, relying on averages and distribution functions using Monte-Carlo techniques to answer policy questions. Others are physics-based, relying on differential equations describing such phenomena as the physics of flight, communication errors and...
The modernization of the European air transportation system will increase the need for data communication. This creates the need for large-scale simulations to ascertain that new aeronautical communication systems fulfil the requirements of future air traffic management communication. This paper presents a framework for such simulations based on service-oriented software architecture. The Framework...
It is well known that wireless telecommunication systems operating at frequencies higher than approximately 10 GHz are strongly affected by atmospheric components, among which rain always plays the prevailing role. An accurate description of the atmospheric impairments, especially those caused by precipitation, is then very useful to select the best mitigation technique to counteract deep fades. In...
In the present paper, a new approach is proposed to assess the clear-sky direct normal irradiance (DNI) in real time. This approach combines an existing empirical model, proposed by Ineichen and Perez in 2002, with a new methodology for the computation of atmospheric turbidity. This methodology takes advantage of the fact that changes in atmospheric turbidity are relatively small throughout the day...
The knowledge of possible impairments due to atmospheric propagation is of importance in the framework of future 5G mobile networks that use spectrum resource up to the W band. Here, the authors propose the scalar Scattering Indicator (SI), defined as the difference between the simulated TB at 72 GHz and the TB value estimated at the same frequency from a nonlinear combination of TB's values at 23...
The requirement and characteristic in Computer Generated Forces behavior modeling were analyzed. From the design concept of American OneSAF system, a method for behavior modeling based on composability was proposed and the formalization description of behavior was given. Moreover, the Behavior Modeling Composer Tool was developed based on this method to assist the behavior modeling. Finally, an application...
This paper describes the simulation approach and model for a software tool used to analyze passive radar scenarios. A database of known transmitters includes more than 250,000 sources from FM radio, digital television, cellular, and aeronautical radio-navigation aids. Terrain is considered using digital elevation maps and the Irregular Terrain Model. The tool calculates the expected detection and...
Terrain Awareness and Warning Systems (TAWS) are on-board systems that alert crews to imminent Controlled Flight into Terrain (CFIT). Originally required by the FAA in 1974 for all Part 121 aircraft, this technology has advanced to include GPS data, terrain and obstacle databases, and sophisticated flight deck displays to provide increasingly accurate and timely alerts. TAWS equipment is capable of...
In every Model-Based Diagnosis (MBD) approach, a model of a real-world system and some observations of such a system are used by a diagnostic algorithm to compute diagnoses. Contrary to MBD classical hypotheses, real-world applications provide us with empirical data suggesting that diagnostic systems, i.e. a model, observations and a diagnostic algorithm, are sometimes abnormal with respect to some...
A method for fitting an ellipse-shaped reception region to a set of location-stamped radio signal reception reports, or location fingerprints, is presented. Reports are modelled as having a multivariate Student distribution. The method is less sensitive to outliers than existing smallest-enclosing ellipse and Normal-distribution based methods. A Gibbs sampling algorithm and an Expectation-Maximisation...
Discovering the correct dataset efficiently is critical for computations and effective simulations in scientific experiments. In contrast to searching web documents over the Internet, massive binary datasets are difficult to browse or search. Users must select a reliable data publisher from the large collection of data services available over the Internet. Once a publisher is selected, the user must...
This paper describes a model of IR absorption based on the line-by-line integral. It briefly introduces Beer-Lambert law. Non-Dispersive Infra-Red (NDIR) technology uses a broadband light source which can not meet the condition of the monochromatic light. Thus the line-by-line integral method is used to establish a spectral absorption model with a certain bandwidth. Then using Matlab programs, the...
In order to develop an effective technical methodology for environmental pollution data management and modeling, this paper propose an integrated framework for pollution modeling based on the GIS database. Three layers, including the pollution data management layer, the modeling and analysis layer, and the application layer, construct the complete framework. Design issues of the framework are discussed...
In order to solve the problems of the simulation data management in a company or institution, the Universal Simulation Data Management System (USDMS) is studied. The simulation data management task is analyzed for the data ownership management in the USDMS. The metamodel of the Basic Data Object (BDO) is proposed creatively for the related simulation data. The implementation of the USDMS in the database...
Because tests at Army Test and Evaluation Command (ATEC) ranges can often only be conducted under specific atmospheric conditions, climatologies of each range could be a very useful tool for long-range test planning. Such datasets can provide the probability density function of near-surface wind speed, percent cloud cover, temperature, precipitation, turbulence intensity, upper-atmospheric wind speed,...
Performance assessment of military wireless network designs should ideally be evaluated by replicating the conditions in which these systems will operate. For airborne networks, where network platforms are fast movers operating under noisy and unstable links environments, the representation of these environments becomes essential for network simulation modeling. However, not all simulations developed...
Rules are the basis of decision-making in the combat simulation execution. In event driven mode, when a certain event occurs, many rules are chosen and bring in different results in combat simulation process. Analyses the representation and execution of production rules, studies the rule priority based reasoning, defines two kinds of rule priority, default priority and user defined priority. It presents...
Natural environment modeling and simulation is a hotspot in M&S field. Atmosphere environment simulation is an important part of synthetic natural environment modeling and simulation. In military training and weapon manufacturing, it is very important to promote simulation fidelity via combining the atmosphere environment simulation with traditional simulation systems. This paper studies the atmosphere...
Synthetic natural environment (SNE) data is different from the general entity data. SNE data are data-field changing with time and space. The hierarchical synthetic environment database system was designed according to the SNE data characteristics and the simulation application needs. The SNE database system included primary environment database, standard environment database compatible with synthetic...
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