A STUDY ON THE RELIABILITY OF THE DAEJEON HARDWARE CORRELATOR FOR THE KVN OBSERVATION MODES
KVN 관측모드별 대전상관기의 상관결과 고찰

SE-JIN OH, DUK-GYOO ROH, JAE-HWAN YEOM, CHUNG-SIK OH, SANG-SUNG LEE, DONG-KYU JUNG, HYO-RYOUNG KIM, HYUN-SOO CHUNG
2016 Publications of The Korean Astronomical Society  
This paper presents the results of test observations toward a point source, 4C39.25, for observation modes with various bandwidths and numbers of IF streams in order to examine a reliability of the Daejeon hardware correlator performance for correlating VLBI (Very Long Baseline Interferometry) data obtained with the several observation modes of the KVN (Korean VLBI Network). We used a DiFX software correlator (DiFX) as a reference, for investigating the output visibilities from the Daejeon
more » ... om the Daejeon corelator. It is found that the band shapes of the output visibilities from two correlators are similar to each other and the correlated flux density for each baseline obtained from the Daejeon hardware correlator is lower by 3 -7% than that from the DiFX. The flux difference is attributed to the limitation of FPGA resources and the difference of fringe rotation algorithm of the Daejeon hardware correlator. The conversion factor, 0.93 ~ 0.97, is proposed for future correlation with the Daejeon hardware correlator.
doi:10.5303/pkas.2016.31.2.011 fatcat:lawndrz5praeflaf22mxxavzx4