Desarrollo de sistema de radiación con software definido por radio para aplicaciones multiantena mimo y radares utilizando tarjetas USRP.

Abstract

The current research work aimed to develop a radiation system with the Software Defined Radio (SDR) system for multi-antenna Multiple Input Multiple Output (MIMO) and Radar applications using USRP cards. Through theoretical research carried out, the requirements and parameters necessary for implementing and processing the systems were determined to analyze the benefits provided by SDR technology. A group of 4 antennas at a central frequency of 3GHZ was designed and implemented to analyze the scenarios at two polarizations: vertical and horizontal. In the first stage, a program was made to send and receive a message using QSPK modulation through the LabVIEW software for SISO, SIMO, and MIMO 2X2 configurations, finding information on the signal/noise ratio (SNR), constellation diagram, and message received. In the second stage, a Radar system was developed to send and receive a chirp signal, obtain the delay times, and locate the copper plate. The information from both systems was processed using Matlab, and when it was analyzed, it was concluded that better results are obtained when the systems are vertically polarized. The MIMO 2X2 system obtained better SNR values than traditional systems, reaching 55dB in low noise environments. In the radar system, shorter delay times and greater precision were obtained to detect the object's position. This proves that SDR technology provides excellent benefits in obtaining and processing data since it allows to unify the system in a single platform, reducing implementation costs and system failures, offering greater ease in the reconfiguration of parameters and equipment, in addition to being accessible to students, universities and research centers.