Caracterización de materiales dieléctricos usando diferentes técnicas SDRADAR con tarjetas NI USRP 2932.

Abstract

The current research was aimed to characterize dielectric materials using different software-defined radar (SDRadar) techniques with NI USRP-2932 cards. Through bibliographic research, it was possible to determine the characteristics and operating principle of a radar system, as well as the requirements and limitations of the universal software radio peripheral (USRP). The characterization was carried out using three different SDRadar techniques based on the principles of reflection and transmission of frequency modulated continuous wave (FMCW) signals. Through the LabVIEW software, the transmission, reception, and processing blocks of the FMCW signals were developed, together with the USRP-2932 card; the SDRadar system was implemented inside the anechoic chamber of the Computer Science and Electronics Faculty in order to avoid possible electromagnetic interference. Different tests were carried out with each of the SDRadar techniques to validate and compare the results obtained in each one of them. With the first SDRadar technique, the real part of the relative permittivity of various dielectrics was estimated, and with the second SDRadar technique, the loss tangent was calculated. Finally, with the third SDRadar technique, the real part of the dielectrics' relative permittivity under study was calculated again. Subsequently, a statistical analysis of all the data obtained was carried out to validate the results of relative permittivity and the tangent of losses of bakelite, dry wood, and glass. The obtained results were favorable, and the electromagnetic properties of the dielectrics studied were within the values shown in different bibliographic sources, thus ensuring the validity of each SDRadar technique. It is recommended to use a computer with high processing capacities to guarantee the system's correct performance.