Diseño e Implementación de un Radar para la Medición de Velocidad de un Objeto en base al Efecto Doppler, empleando Radio Definido por Software (Rds)

Abstract

The present job consists of the design of a radar based on software defined radio that in addition to being able to detect moving targets, has the main objective of measuring the speed of a target of interest, for which the theory of electromagnetic waves, digital signal processing and Doppler effect were used.

For the implementation of this radar the following elements were used: one software defined radio portable device Adalm-PlutoSDR, directional antennas Altelix ad5g23m2-2pk, a laptop and a mast. The open source software GNU Radio was used to develop the radar program and manage the SDR device. This software allows the configuration of the transmitter and receiver, visualize the characteristic phenomenon of Doppler effect and save the data signal for its analysis.

In order to obtain the speed, the data signal is analyzed off-time in MatLab by Mathworks, so we gain greater control over signal processing and information visualization.

The field tests carried out for this degree project were developed using an automobile, taking advantage of the fact that it has a speedometer, which will facilitate the measurement of speed when passing through the antennas and the calculation of the measurement error. This was done considering three scenarios: when the antennas have a pointing angle of zero, thirty, and forty-five degrees. In each of these scenarios, speeds of 20, 40 and 60 km/H were considered in order to facilitate the understanding of the Doppler effect.