Title :
Design of an interim digital spectro-correlator for the Yuan Tseh Lee array for microwave background anisotropy
Author :
Homin Jiang ; Liu, Hongying ; Chang, Ronald
Author_Institution :
Acad. Sinica Inst. of Astron. & Astrophys., Taipei, Taiwan
Abstract :
This paper reports the laboratory design and implementation of a four-antenna digital spectro-correlator for the Yuan Tseh Lee Array for Microwave Background Anisotropy (AMiBA). The system comprises four 5 Giga-samples/s (Gs/s), 8-bit analog to digital converter (ADC), and four Reconfigurable Open Architecture Computing Hardware 2 systems (ROACH2). The 5 Gs/s ADC board was designed by the authors, and the ROACH2 platform was manufactured by the Collaboration for Astronomy Signal Processing and Electronics Research (CASPER) community. The system has a bandwidth of 1.6 GHz, 128 spectral channels, an FX-type correlator, one polarization, and four antenna inputs. The correlation accumulators report the cross-correlation results of the six baselines, as well as the autocorrelation results of the four antennas. The system is planned to be characterized according to the results of various experiments before deployment: Allen deviation, optimal input power of the system, and confirmation of the correlator coefficient of the system. The new digital system is intended to replace the old analog system, which has no spectral information. This new system enables the AMiBA for new scientific missions, such as CO intensity mapping.
Keywords :
correlators; microwave antenna arrays; ADC board; AMiBA; Allen deviation; CO intensity mapping; FX-type correlator; ROACH2; Yuan Tseh Lee array; analog system; analog to digital converter; bandwidth 1.6 GHz; correlation accumulators; cross-correlation; four reconfigurable open architecture computing hardware 2 systems; four-antenna digital spectro-correlator; interim digital spectro-correlator design; microwave background anisotropy; optimal input power; polarization; spectral channels; word length 8 bit; Antennas; Arrays; Correlators; Engines; Field programmable gate arrays; Hardware; Optical switches; Correlator; Field Programmable Gate Array (FPGA); Interferometer;
Conference_Titel :
General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI
Conference_Location :
Beijing
DOI :
10.1109/URSIGASS.2014.6930032