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Research at the Frequency Standards and Metrology Laboratories at the University of Western Australia has involved the invention, creation and applications of precise frequency generation and measurement. In recent years we have pursued a range of research topics from tests of fundamental physics to commercial and space applications. The symbiotic relationship between applied and fundamental related...
The compliance with standards calls for proper designed EMI filters. EMI typically comprises common mode (cm) and differential mode (dm) noise. A systematic optimization of EMI filters requires the knowledge of the contribution and distribution of these two noise sources. The paper discusses different methods that allow the independent measurement of cm and dm noise. One suitable method described...
If the RCS of a target is measured in measurement facility which is not a Faraday cage, this RCS might be corrupted by eventual outside transmissions which fill the same spectral band than measurement. In this situation, outside radiations are going to pollute the value of the measured RCS and as a consequence their level must be reduced in order to be able to get correct values of RCS. This article...
Phased array feeds can greatly increase the field of view of interferometric radio telescope arrays. High dynamic range imaging with these arrays requires compensation for drifts in the many receiver-chain gains. A calibration system using surface radiators is proposed for the Australian Square Kilometre Array Path Finder. Design considerations and a proposed system are discussed.
A series of spark discharge phenomenon would be observed when an electric locomotive (or EMUs) running through an electricity neutral section, along with significant electromagnetic noise emissions. Such disturbance emissions may affect the train's control system and/or communications system to produce electromagnetic interference. In this paper, different discharging circuits' models between the...
Transient recordings of the electric and magnetic fields over the audio-band display significant transient pulses (spherics) which can be used for surface impedance measurements providing the lighting strike is distant and predominantly vertical. Horizontal lighting strikes, other atmospheric noise and instrument noise creates incorrect surface impedance data. Automated spheric selection can be made...
Study of high speed radio wave characteristics is significant for development of High-speed mobile communication technology. According to the mobile radio propagation characteristics, a method of measurement of these characteristics is proposed in this paper. Based on the sophisticated measurement instruments and the virtual instrument technology, the high speed measurement system is established and...
This paper describes a numerical approach for the analysis of a reflector antenna system which is fed by a Phased Array Feed. This approach takes mutual interaction effects into account between the antenna array and the low noise amplifiers in the evaluation of the system sensitivity and optimization of the beamformer weights, and can be used when several signal and noise sources are present on the...
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