Theoretical Accuracy Analysis of a 4-Beam Speed- Over-Ground Radar on Uneven Surface

Speed over ground radar (SoG) is a contactless velocity measurement technique for land vehicle. Recently, the idea of using SoG radar have become increasingly attractive due to the demands in accurate velocity measurements for vehicle safety systems. Despite SoG developments, assessments on the SoG uncertainty when moving on bumpy surface such as on off roads is not yet available. In this paper, we consider the use of SoG radar with 4 diverging beams. We present the theoretical accuracy assessment of this approach. Based on its measurement geometry, a simple derivation is developed to approximate the accuracy of the method. The results from the analysis shows that the 4-beam radar system can significantly minimise the error when moving on bumpy surface.