What is a benefit of establishing different elevation masks for DGPS systems?

Establishing different elevation masks for Differential Global Positioning System (DGPS) systems primarily aims to reduce the likelihood of position jumps. An elevation mask is a threshold that determines the minimum angle at which a satellite signal will be accepted for positioning calculations. By setting elevation masks, the system can filter out low-elevation signals that may be subject to increased interference, multipath effects, or signal attenuation caused by obstacles like buildings or natural terrain.

When the system restricts the number of low-angle signals it considers, it focuses on data from satellites that provide more accurate and stable positioning information. This helps in maintaining the integrity of the positioning solution and minimizes sudden changes in calculated position, which can occur when inaccurate or noisy signals are included in the computation. Position jumps can lead to unsafe conditions, especially in dynamic positioning applications where precise location is crucial for vessel operation.

In summary, setting appropriate elevation masks optimizes the reliability and accuracy of DGPS data, thereby enhancing the overall performance of navigation systems by significantly reducing the risk of erroneous position fixes.