ONE-DIMENSIONAL IMAGING WITH THE WASEDA FFT RADIO TELESCOPE

A sixty-four-element fast Fourier transform (FFT) type radio interfero meter has been constructed at Waseda University. Using eight east-west elements, eight one-dimensional beams were formed. The analog phase e rrors in the baseband signals of 64 channels were measured by fringe o bservations, and were corrected by a digital processor. Images of two radio sources were obtained in transit observation, when they passed t he fixed eight fan-beams. This is the real-time one-dimensional imagin g of eight pixels. The present image forming technique could be a basi s for two-dimensional imaging. We report the frontend system and its p erformance in the observation.