A MULTI-BEAM RADIO TRANSIENT DETECTOR WITH REAL-TIME DE-DISPERSION OVER A WIDE DM RANGE

Journal of Astronomical Instrumentation

K. KUEHN¹  R. HUPE² 

[1] Argonne National Laboratory, Lemont, IL 60439, USA;Department of Physics, The Ohio State University, Columbus, OH 43210, USA

关键词: Fast transients;    multi-beam antennas;    time-domain radio astronomy;   

DOI  :  10.1142/S2251171714500044

学科分类：天文学(综合)

来源: World Scientific Publishing Co. Pte. Ltd.

【 摘 要 】

Isolated, short dispersed pulses of radio emission of unknown origin have been reported and there is strong interest in wide-field, sensitive searches for such events. To achieve high sensitivity, large collecting area is needed and dispersion due to the interstellar medium should be removed. To survey a large part of the sky in reasonable time, a telescope that forms multiple simultaneous beams is desirable. We have developed a novel FPGA-based transient search engine that is suitable for these circumstances. It accepts short-integration-time spectral power measurements from each beam of the telescope, performs incoherent de-dispersion simultaneously for each of a wide range of dispersion measure (DM) values, and automatically searches the de-dispersed time series for pulse-like events. If the telescope provides buffering of the raw voltage samples of each beam, then our system can provide trigger signals to allow data in those buffers to be saved when a tentative detection occurs; this can be done with ...

【 授权许可】

Unknown