A wideband dual-mode digital receiver and its signal processing method

Abstract

The present invention provides a wideband dual-mode digital receiver and a signal processing method thereof, including a shared signal processing module for providing subband output signals of each antenna; a correlation processing module for performing correlation operations on the subband output signals of each antenna, Obtain relevant result data; the beamforming module is used to perform beamforming processing on the sub-band output signals of each antenna to form beams; the shared signal processing module includes: the analog-to-digital conversion module is used to convert analog broadband signals into digital broadband signals; delay compensation The module is used for delay compensation; the channelization processing module is used for obtaining digital narrowband signals; the phase compensation module is used for phase compensation; the frequency selection module is used for selecting subband output signals of different frequencies from the digital narrowband signals. The invention can simultaneously observe the radio source in two modes of multi-beam synthesis and synthetic aperture correlation, reduces the data processing hardware requirement of the receiver, and improves the performance of the radio telescope array at the same time.

Description

technical field [0001] The invention relates to the technical field of radio observation, in particular to a wideband dual-mode digital receiver and a signal processing method thereof. Background technique [0002] The very low frequency band (<30MHz) is one of the last unobserved spectral windows, and its potential scientific discoveries make it a hot spot in radio astronomy research. However, in the frequency band lower than 30MHz, a large number of man-made strong radio interferences severely limit people's observation of cosmic radio radiation, and the reflection and absorption of the earth's ionosphere makes it possible to conduct research on cosmic radio radiation below 10MHZ based on ground-based radio telescopes. Observation is very difficult. But fortunately, the new solar physics research shows that the solar activity is a minimum period in the current 11-year cycle, and will reach the bottom around 2020, and the cut-off frequency of the earth's ionosphere will...

AI Technical Summary

Problems solved by technology

That is to say, in existing digital receivers, multi-beam synthesis mode and synthetic aperture correlation mode cannot work at the same time, and radio sources cannot be imaged at the same time

[0009] Furthermore, the existing digital receivers implement signal correlation and synthetic aperture imaging processing through subsequent software, resulting in very high requirements for the processing capabilities of the back-end signals

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