RADIO PHYSICS AND RADIO ASTRONOMY

A new two-channel digital receiver-spectrometer whose parameters and functional capabilities are optimized to provide its effective use in decameter telescopes, as well as in other systems where high precision and synchronization of measurements are required, is described. The receiver has a low level of noise floor, a high dynamic range and sensitivity. The implemented features of the receiver are continuous writing of raw data  waveform mode) for the two channels simultaneously at ADC sampling rate up to 160 MHz (the maximum regulated relative inter-channel delay is 8 μs and increment 8 ps. The receiver offers flexible selection of a segment size of the fast Fourier transform ( N_FFT = 2^10+k , k=1, ..., 5) and resulting frequency range selection (spectrometer mode) with increment of 1024 spectral samples, an ability of inter-channel cross-spectrograms real-time calculation.

Key words: low-frequency radio astronomy, radio telescope, digital receivers, digital signal processing, digital beam shaping

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