Small radio telescopes make it possible to observe the hydrogen emission line of 21 cm at 1420 MHz and to demonstrate the presence of dark matter by measuring the galactic rotation curve of the Milky Way. This paper presents the design, integration and analysis of data carried out to assemble a radio telescope using (COTS, Commercial off-the-shelf). The design uses inexpensive and commercially available materials. The receiver system consists of low-noise amplifiers, band-pass filters, and a software-defined radio USB receiver that provides digitized samples for spectral processing on a computer. The experimental results obtained through several tests carried out to adjust the software settings are presented, to finally estimate the velocity dispersion of the neutral hydrogen of the arms of the Milky Way and compare the results with other observations.
Keywords
Neutral hydrogen, Radio telescope, Milky Way, SDR, COTS