Smart tunable rf corner reflector for runway identification using millimetric radar

Ian D. Grant; Raymond J. Butler; Steve Turner

doi:10.1117/12.209349

12 May 1995 Smart tunable rf corner reflector for runway identification using millimetric radar

Ian D. Grant, Raymond J. Butler, Steve Turner

Proceedings Volume 2447, Smart Structures and Materials 1995: Industrial and Commercial Applications of Smart Structures Technologies; (1995) https://doi.org/10.1117/12.209349
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

Research has shown that at certain frequencies the returned signal from a corner reflector can be canceled by causing the orthogonal surfaces to diverge by 2 to 3 degrees. This paper reports on how this can be achieved using fiber reinforced composite materials and integrated piezoelectric actuators. A range of different bond configurations are examined for use with raw PZT actuators and resin encapsulated actuators. Based on the information gained from this first part of the investigation a 100x100-mm active plate was constructed using 16 actuator elements bonded to a GRP substrate. A total angle of deflection of 0.5 degrees was created through the application of 100 v DC. Extensive research is currently underway to develop and enhanced vision system (EVS) for use on civil airliners to assist the pilots when making landings in very poor visibility. This is likely to be based on either an active or passive millimetric radar system operating at 35 or 94 GHz. If an active EVS is developed, then corner reflectors such as those described here could be used to identify the operational runway and when not in use be switched off. The results presented in this report provide a basic insight into how this can be achieved; however, further work will be required before an operational system could be produced.

Citation Download Citation

Ian D. Grant, Raymond J. Butler, and Steve Turner "Smart tunable rf corner reflector for runway identification using millimetric radar", Proc. SPIE 2447, Smart Structures and Materials 1995: Industrial and Commercial Applications of Smart Structures Technologies, (12 May 1995); https://doi.org/10.1117/12.209349

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