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Electromagnetic (EM) emissions from portable electronic devices (PEDs) carried onboard aircraft can interfere with avionic systems. Several onboard systems using EM waves have been planned, such as mobile communications and UWB (ultra-wideband) entertainment services distribution. Manufacturers of this system develop schemes to avoid electromagnetic interference by the transmissions (emissions) of...
The polarisation characteristics of a high-voltage power-line radar cross-section (RCS) at 76 GHz are experimentally evaluated to improve the detection conditions of the helicopter obstacle detection radar system. Vertical polarisation transmission and reception (V–V) are normally used to detect power lines. In addition to V–V polarisation, horizontal transmission and reception (H–H) polarisation...
This paper gives an overview of mm-Wave reflectarrays used for civil radar applications such as collision avoidance system for rescue helicopters at 94 GHz or FOD detection on airport runways at 77 GHz. Both antenna designs and examples of radar performances are presented and discussed.
The paper is a joint work between the LEAT (France) and the ENRI (Japan) in the framework of a Sakura project supported by the JSPS and the French Ministry of Foreign Affairs. The purpose is the study of a FOD (Foreign Object Debris) detection system on airport runways. A FM-CW mm-Wave radar working between 76.25 and 76.75 GHz is used together with a high directivity printed reflectarray. Measurement...
Automotive radars are becoming widespread for safety reasons. However their effectiveness remains doubtful since even a metal car does not have strong RCS over all angles of its body. For reduction of traffic accidents, the solution is not only surveying around car-body but also making vehicles easily visible to drivers by means of radar and other luminous sources. This paper introduces a lens antenna...
Foreign objects and debris (FODs) may cause accidents or disasters. The crash of a Concorde jet in France that killed 113 people in 2000 is an example of the danger created by a thin metal strip that fell from another airplane. Recently, FOD detection systems have been developed and tested on airports. Most of them are based on the association of a mm-Wave radar and an optical sensor. This paper describes...
In this paper a new radome structure made from styrene foam coated with Efrethanreg is described together with experiments on its performance. Sufficient strength to endure environmental stress is obtained from the Efrethan layer. Optimal losses are obtained from 1 mm or 2 mm coating at three frequencies in W-band. The developed radome performed with - .18 dB loss at 76 GHz without any disturbance...
Foreign Objects and Debris (FODs) must be removed from runways. With the necessity of automatic continuous survey, we are investigating a new FOD detection system based on a millimeter wave radar network. This paper describes the concept of this FOD detection system and the Radio Frequency (RF) module for this application. In order to minimize cost and size, we installed a broadband FMCW radar using...
The mechanism of film formation on the Ni anode in a well dehydrated melt of NH 4 F·2HF was studied at 100°C. The potentiodynamic and potentiostatic polarization behaviors of the Ni anode were investigated to elucidate the anodic processes. The oxidized layer was composed of NiF 2 with a small amount of nickel oxides such as NiO and Ni 2 O 3 or oxyfluorides having plural...
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