Technique to reduce multipath GPS signals

It is well known that multipath error is one of the major error sources affecting the positional accuracy of Global Positioning System (GPS). Although the multipath effect can be reduced by choosing sites without multipath reflectors or using proper antennas to mitigate the reflected signal, it is difficult to eliminate all multipath effects from GPS observations. Here, a technique based on vertical ground planes to effectively reduce the multipath occurring at ±5° of the horizon is presented.