Abstract: Weather simulation is a modular addition to a digital radar landmass simulator (DRLMS). The DRLMS is a four channel system, i.e., culture, elevation, aspect and weather. All four channels are integrated to provide a simulated radar landmass simulation with weather. Implementation entails the full or partial occultation of terrain and targets by weather and vice versa. Weather mass is simulated in three dimensions; that is, it has a bottom and height. The weather mass is not made of simple geometric objects. Weather maps can be loaded into the system as weather patterns, and the weather patterns can be expanded, rotated and translated. In addition, the weather channel can be used to simulate chaff and jamming patterns.

Abstract: A unique digital radar landmass simulator (DRLMS) uses different culture data compression techniques and hardware from that used in the conventional DRLMS systems. The application of these techniques to DRLMS results in a system that is small in size and high in performance. During the data base preparation, Defense Mappinig Agency (DMA) Digital Terrain Elevation Data (DTED) and Digital Feature Analysis (DFAD) data are processed and compressed for elevation, reflectivity and aspect channels with different compression schemes. The compressed data is then stored on disks for each channel. Dedicated decompression hardware for each channel then retrieves, decompresses, and reconstructs the data. The culture compression and decompression hardware uses a run length compression technique that results in the capability of presenting a very detailed culture map for the terrain. The elevation compression uses a table look-up technique that generates high resolution terrain data.