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Abstract A sixty-four-element fast Fourier transform (FFT) type radio interferometer has been constructed at Waseda University. Using eight east-west elements, eight one-dimensional beams were formed. The analog phase errors in the baseband signals of 64 channels were measured by fringe observations, and were corrected by a digital processor. Images of two radio sources were obtained in transit observation, when they passed the fixed eight fan-beams. This is the real-time one-dimensional imaging of eight pixels. The present image forming technique could be a basis for two-dimensional imaging. We report the frontend system and its performance in the observation.
Nakajima et al. (Sun,) studied this question.