Title :
Broadband radio interferometer utilizing a sequential triggering technique for locating fast-moving electromagnetic sources emitted from lightning
Author :
Mardiana, R. ; Ushio, T. ; Ota, Y. ; Murakami, M. ; Kawasaki, Z. ; Matsuura, K.
Author_Institution :
Dept. of Electr. Eng., Osaka Univ., Japan
Abstract :
A broadband radio interferometer to investigate the location of fast-moving electromagnetic sources emitted from lightning discharges has been designed and tested. A sequential triggering technique was applied to the system for recording the data of electromagnetic pulses, once the electromagnetic pulse is detected and its amplitude exceeds a threshold level, the triggering circuit is turned on to record the waveform for 1 microsecond and ready to acquire another pulse afterwards. This technique can record 2000 electromagnetic pulses maximum. We have implemented our system to locate and retrace fast-moving electromagnetic sources emitted from lightning discharges during a field experiment in Australia in December 1997. We succeeded in reconstructing a cloud to ground lightning discharge and displayed it in two dimensions and in time sequences
Keywords :
atmospheric measuring apparatus; direction-of-arrival estimation; electromagnetic pulse; lightning; radio direction-finding; radiowave interferometers; radiowave interferometry; 1 ms; broadband radio interferometer; cloud; design; electromagnetic pulses; fast-moving electromagnetic sources; field experiment; ground lightning discharge; lightning; lightning discharges; sequential triggering technique; testing; threshold level; time sequences; triggering circuit; waveform; Australia; Circuit testing; Clouds; EMP radiation effects; Electromagnetic fields; Electromagnetic scattering; Fault location; Lightning; Pulse circuits; Radio interferometry;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE
Conference_Location :
Venice
Print_ISBN :
0-7803-5276-9
DOI :
10.1109/IMTC.1999.776124
