Sistema de radar SDR de onda continua múltiple implementado mediante GNU Radio

Software Defined Radio (SDR) is a technology with recognition in Telecommunication industry because of its capacity of developing reconfigurable communication systems. This paper presents the implementation and field-testing evaluation for a low-cost radar system using the gr-radar toolbox created into the version 3.7.4 of GNU Radio. Tests allowed to measure distances and velocities of one target in movement. Velocity estimation errors were obtained with 1.8 % and 3.22 % in a round trip. Range estimation errors were also obtained with 1.56 % and 2.75 % in a round trip. Radar system was configured to transmit at 2.4 GHz with Multiple CW technique. The test scenario was the Nueva Granada Military University Campus in Colombia. The results are oriented toward use this tools for deepening on basic Radar principles with low-cost devices.Radio definido por software (SDR) es una tecnología reconocida en la industria de telecomunicaciones por su capacidad para desarrollar sistemas de comunicación reconfigurables. Este trabajo presenta el diseño, la implementación y la evaluación de un radar de bajo costo utilizando la librería gr-radar disponible desde la versión 3.7.4 de GNU Radio. La evaluación de desempeño del radar implementado se realizó mediante pruebas en espacio abierto donde fue posible medir con gran exactitud la distancia y la velocidad de un objeto en movimiento. En la estimación de la velocidad se obtuvo un error de 1,98 % en el trayecto de ida y de 3,22 % en el de regreso. Para la estimación de posición se obtuvo un error promedio de 1,56 % para los trayectos de ida y de 2,75 % en el regreso. El sistema de radar fue configurado para transmitir a 2,4 GHz con la técnica de ondas continuas múltiples. El escenario en el que se desarrolló la prueba del sistema fue el campus de la Universidad Militar Nueva Granada, en Cajicá (Colombia). Los resultados mostrados en este trabajo se orientan a la profundización en las técnicas de radar empleando herramientas de bajo costo

DTMP: Energy Consumption Reduction in Body Area Networks Using a Dynamic Traffic Management Protocol

Advances in medical sciences with other fields of science and technology is closely casual profound mutations in different branches of science and methods for providing medical services affect the lives of its descriptor. Wireless Body Area Network (WBAN) represents such a leap. Those networks excite new branches in the world of telemedicine. Small wireless sensors, to be quite precise and calculated, are installed in or on the body and create a WBAN that various vital statistics or environmental parameters sampling, processing and radio. These nodes allow independent monitoring of a person's location, in typical environments and for long periods and provide for the user and the medical, offer real-time feedback from the patient's health status. In this article, the introduction of WBAN and review issues and applications of medical sensor networks, to offer a protocol has been established that the threshold for data transmission reduces power consumption on sensor nodes, increasing the lifetime of the network and motion phase to increase the dynamics of the network. The proposed protocol in the network been compared with the SIMPLE and ATTEMPT protocols. Results indicate a significant reduction in energy consumption of sensors to reduce energy consumption the entire network

Enhanced 3D localisation accuracy of body-mounted miniature antennas using ultra-wideband technology in line-of-sight scenarios

This study presents experimental investigations on high-precision localisation methods of body-worn miniature antennas using ultra-wideband (UWB) technology in line-of-sight conditions. Time of arrival data fusion and peak detection techniques are implemented to estimate the three-dimensional (3D) location of the transmitting tags in terms of x, y, z Cartesian coordinates. Several pseudo-dynamic experiments have been performed by moving the tag antenna in various directions and the precision with which these slight movements could be resolved has been presented. Some more complex localisation experiments have also been undertaken, which involved the tracking of two transmitter tags simultaneously. Excellent 3D localisation accuracy in the range of 1-4 cm has been achieved in various experiment settings. A novel approach for achieving subcentimetre 3D localisation accuracy from UWB technology has been proposed and demonstrated successfully. In this approach, the phase centre information of the antennas in a UWB localisation system is utilised in position estimation to drastically improve the accuracy of the localisation measurements to millimetre levels. By using this technique, the average localisation error has been reduced by 86, 31, and 72% for the x-, y-, and z-axis coordinates, respectively.Published versio