Comments on “Systematic errors in ground referenced geometric height monitoring”

Manolakis and Lefas see (IEE Proc.-F, vol.140, no.2, p.138-44, 1993) mentioned that the errors in range measurements are due to inner mode delay differences, the effects of bottom and top antenna switching and other factors, such as varying range delay and bias correction quantisation factors, along with transponder time delay. This error is treated by the authors as fixed bias. In general, it is not uniform throughout. The end behaviour is influenced by many factors and therefore cannot be adequately modelled by deterministic variables, and hence this error is to be treated as a random time function