Propagation time estimation for microwave subsurface radar by novel cross-correlation and envelope method. A study on high resolution microwave subsurface radar image. 2

For pt.1 ("Identification of Transmitting Wave Form for Deconvolution Process. A Study on High Resolution Microwave Subsurface Radar Image. 1") see ibid., p.1891-3 (2002). A time of a microwave propagation from a transmitter to a receiver via a reflective object in a soil is estimated based on a model fitness. Since the model fitness is expressed as a function of time and has a single-peaked pattern at the propagation time, the propagation time is determined from the time of the peak of the model fitness. It is proven in this paper that the model fitness can be calculated as an envelope of a cross-correlation function between a transmitting wave and a receiving wave. The propagation times are obtained at each measurement point. A point diagram plotted the peak time on x-z coordination shows clearly the position of the object. In this report, detections of three different size of steel pipes are experimentally demonstrated.