CAST-170 Terrain Obscuration Program
Terrain Obscuration Program Software Positioning and navigating with GPS usually work optimally in open sky scenarios, such as in the air and in flat landscapes. The terrain surrounding the simulated vehicle can sometimes block satellite signals, however, leading to reception problems. This is especially true in urban areas or mountainous locations, where tall buildings, vegetation, and mountains block the Line of Sight Signals (LOS) of satellites. Often, the signal interacts with multipath (MP) and the local environment, reducing the capability of the unit to do reactive command and control. This also leads to an erroneous input to the receiver front end, and less accurate position fixes. It doesn’t matter what obscures the satellite – the outcome is a loss of reliable positioning, timing, and navigation (PNT) data. Fortunately, we offer the CAST-170, a Terrain Obscuration Program (TOP) software that enables testers to check the satellite visibility in real time. It also allows users to determine the effects of the area terrain on a ground-vehicle-based GNSS receiver when combined with one of our CAST simulators.