Subsurface radar examination of an airstrip

Holographic subsurface radar for diagnostics of cryogenic fuel tank thermal insulation of space vehicles

“…multi-reflections of the transmit pulse between the radar antenna and strong reflectors such as the metal supporting structure to which thermal insulation or heat protection coatings are attached. In this case, the primary reflection of interest is obscured by multiple reflections (often called ghosts or phantoms) of the transmitted impulse signal [15]. Holographic subsurface radars of RASCAN type which are discussed in this article are free from this effect because they are continuous wave radar.…”

“…In fact, after the first flight of Columbia (April 12, 1981) 16 tiles were lost and 148 tiles were damaged [5]. Similar problems with more serious after-effects arose after the first and only flight of Buran (November 15,1988). Post-flight inspection showed partial destruction to complete loss of thermal shielding tiles, Fig.…”

A Simple Processing Approach for Holographic Rascan Data

“…Such materials cannot currently be inspected non-destructively with traditional timedomain impulse radar technology. In fact, the reverberation of pulses between the radar antenna and shallow metal objects obscures the actual location and the shape of the objects, while the object is lost in the multiple reflections (often called 'ghosts' or 'phantoms') of the transmitted impulse signal [6]. The capability of holographic radar to image objects located over metal surfaces could be very important, f.i.…”

An Example of Holographic Radar Using at Restoration Works of Historical Building

“…Such materials cannot be effectively inspected with traditional time-domain impulse radar technology. Reverberation of pulses between the radar antenna and shallow metal objects obscures the actual location and shape of these objects which are seen as multiple reflections (often called ghosts or phantoms) of the transmitted impulse signal on a relatively uniform background [3].…”