Current Page: NeXtMidas User's Guide Result Parameters System Modeling Data
| ### System Modeling Data System modeling refers to a family of applications for Type 5000 data. This file format was designed to aid the analysis of distributed objects moving in three-dimensional space and the propagation of electromagnetic energy. The following applications were accommodated by the original design of the Type 5000 file structure: Analysis of kinematic relationships among point objects in space, including relative position, velocity, acceleration, and jerk as well as look angles relative to various reference directions Flying ballistic trajectories from classical orbital elements or initial state vectors Modeling powered flight from initial conditions and an acceleration versus time profile Analysis of aerodynamic flight trajectories Analysis of attitude relationships among distributed objects in space Conversion of position, velocity, acceleration, jerk, and attitude vectors among different coordinate systems Analysis of RF propagation effects along line-of-sight and specularly reflecting transmission paths whose nodes may be in relative motion, including propagation delay, doppler shift, antenna gain, free-space path loss, and reflection losses Differential analysis of two or more propagation paths from one or more transmitters to one or more receivers The details of working with system modeling data are beyond the scope of this document, but explaining the underlying concepts is not. In particular, it is important to understand how establishing a hierarchy of reference frames simplifies the analysis of complex, time-varying geometries and how/why "frame of reference" and "coordinate system" mean different things in this context. Command support for Type 5000 files is relatively weak in NeXtMidas' factory-supplied option trees, but X-Midas contains a large number of commands for manipulating system modeling data. This enables construction of distributed system modeling applications that combine NeXtMidas graphics with X-Midas computation.