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We have also considered the Android App and are happy to announce that all our previous KerberosSDR customers will receive a license for the upgraded app when it is released too.
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This technique allows the short-circuited parasitic elements to act as a reflector, whereas other parasitic elements act as directors when they are open-circuited.įor and for most, the direction of maximum gain is being controlled by open - and short-circuiting the relative parasitic elements with respect to the four quarters of the circular antenna, a set of radiation patterns is formed covering the horizontal plane at 0°, 90°, 180°, and/or 270°.įurthermore a new algorithm is developed using amalgamation of a SDR#, Matlab and Visual Studio to extract the exact direction of the signal (AoA) by analyzing the stored I/Q data.Kerberossdr app Below is screenshots from a 415 MHz DMR tower that we located with KerberosSDR. All parasitic elements are assumed to be electronically switched between short-circuit by inductor termination or open circuit by capacitor termination states to change their resonant length. The antenna system is a circular array of quarter wavelength dipoles, with four parasitic elements positioned equidistantly, surrounding one active central element. This paper presents a new method of determination of an angle of arrival (AoA) and hence radio signal direction finder (RDF) by using electronic beam steering of an antenna array system based on one active element and four switched parasitic elements. The antenna design, its application to determine the direction finding, the new algorithm are presented below. The system is controlled by using Arduino to switch between regions (0-90),(90-180),(180-270) or (270-360) and analysed by using a newly developed method based on I/Q samples to extract the amplitude and phase of the desired signal to find the exact direction in that region. The design based on a central active monopole and an array of four parasitic monopoles equidistantly from the central element by 0.20 λ, placed on ground plane to provide the 360 degree azimuthal coverage without any moving parts, provides excellent directional resolution. The directivity of the antenna array achieved by increasing/degreasing the electrical length of the parasitic elements. An electronically controlled parasitic antenna array consisting of one active element connected to a software defined radio (SDR) receiver and four passive parasitic elements used to design and construct affordable radio direction finding system.