Unmanned Aerial Vehicles (UAVs), also known as drones, have had an exponential evolution in recent times due in large part to the development of technologies that enhance the development of these devices. This has resulted in increasingly affordable and better-equipped artifacts, which implies their application in new fields such as agriculture, transport, monitoring, and aerial photography. However, drones have also been used in terrorist acts, privacy violations, and espionage, in addition to involuntary accidents in high-risk zones such as airports. In response to these events, multiple technologies have been introduced to control and monitor the airspace in order to ensure protection in risk areas. This paper is a review of the state of the art of the techniques, methods, and algorithms used in video, radiofrequency, and audio-based applications to detect UAVs and Unmanned Aircraft Systems (UAS). This study can serve as a starting point to develop future drone detection systems with the most convenient technologies that meet certain requirements of optimal scalability, portability, reliability, and availability.
The evolution in the development of manufacturing techniques of electronic components, including accelerometers, has allowed access to a new field of research and applications in consumer electronics. The aim of this work is to present a method for aligning triaxial accelerometers, finding the parameters of the rotation, the translation and the scale of the homogeneous transformation matrix. In principle, it is necessary to acquire six points to build the frame of reference of the accelerometer and ensure the consistency of the measurements, in order to check the angle between the axis and the magnitude. Subsequently, using spatial geometry, the intersection of the system of reference is estimated, to determine the extent of translation in the homogeneous transformation matrix. In a further step, the rotation values of the matrix are generated by taking the orientation of the z-axis into account and, finally, the resulting factor is scaled to normalize the magnitude value of gravity. Using the transformation matrix, it is possible to align the original reference system of the accelerometer to another coordinate system. The satisfactory results of this experiment show the need of implementing the here described method to enable the use of variable tilt measurements.
Mucho se ha dicho sobre el famoso pintor Vincent Van Gogh. La mayoría de los escritores buscan explicar cómo este hombre de vasto talento pudo comunicar su enorme dolor a través de la pintura y producir obras de belleza abrumadora. Otros se ocuparon por entender si las varias enfermedades y aflicciones que tuvo se convirtieron en una influencia para la forma como representó la vida. Objetivo: es nuestro propósito encontrar una relación entre las dos apreciaciones, para dar una mirada a su existencia de adentro hacia afuera y poder dar luz sobre la obra sin paralelo de Van Gogh; podrían su manejo del color y el uso magistral de la forma tener una razón biológica o quizá una profundamente sentimental.
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