Millimeterwave radar sensors are netted to cover a sufficient region of an airport and deliver as well information on position as classification of debris. To be able to miniaturize the antenna assembly, which is critical for the vicinity of a runway, the 220-GHz radar band is used. Use of this band also allows to achieve a wide signal bandwidth and consequently a high range resolution

The following paper describes the development of an autonomous and compact millimeter wave scanning measurement system (SAMMI - Stand Alone Millimeter wave Imager) which works in the W-Band (CW@78GHz). SAMMI® was developed to demonstrate the high potential and usability of the millimeter wave region for material classification[1]

A millimeter wave imaging system operating around 90 GHz with 7.5 GHz bandwidth is presented. 2D images with 20 mm resolution in range and 3.2° in azimuth are obtained with an 1×4 MIMO approach. The performance of receiver and transmitter modules driven by a Direct Digital Synthesizer is discussed. Experimental data on radar imaging between 1 and 4 m is shown and the used calibration is discussed in further detail. The system successfully achieves a dynamic range of more than 40 dB

Millimetre-wave- and terahertz sensors are a premier choice for the non-destructive inspection of letters and parcels as well as the control of products. A small versatile scanner ahs been developed, which allows to demonstrate this capability. The scanner employs mechanical scanning in transmission geometry, the transmitter ans receiver located at two rotating discs facing its other with the test sample linearly shifted in between. The paper describes the geometrical set-up and gives typical results

For foreign object detection on runways, highly sensitive radar sensors give the opportunity to detect even very small objects, metallic and non-metallic, also under adverse weather conditions. As it is desirable for airport applications to install only small but robust installations along the traffic areas, millimeter-wave radars offer the advantage of small antenna apertures and miniaturized system hardware. A 220-GHz radar was developed, which is capable to serve this application, if several of these are netted to cover the whole traffic area. Although under fortunate conditions the radar allows a classification or even an identification of the debris, the complete system design incorporates 3-D time-of-flight cameras for assistance in the identification process, which are also distributed along the traffic areas. The system approach further relies upon a change detection algorithm on the netted information to discriminate non-stationary alarms and reduce the false a larm ratio