Essay on Air Vehicle Systems ( Avs )

984 Words Sep 11th, 2016 4 Pages
Air-vehicle systems (AVS) show a promising capability to conduct both indoor and outdoor missions in a confined environment by reducing the size to micro-air-vehicles (MAVs) and nano-air-vehicles (NAVs) [1]. To extend the operation time, it is essential to reduce the payload and power dissipation of sensors and controllers especially for navigation of next-generation NAVs [2]. Traditionally, AVS used separate image sensors and digital processors/controllers, however these additional components result in high payload and additional power consumption, especially for communicating among components. Recently, integration of image sensing arrays and processing units together on chip has shown a promising results in low-power optic flow generation [3]. Several object recognition chips have been reported for navigating micro-air-vehicles (MAV) [2][4]. However, these systems still need additional sensors to provide crucial information for navigation, such as obstacle avoidance and self-status, which can be acquired from optic flow sensors. In this paper, we report a single-chip vision-based navigation chip, which is the first attempt to provide both object recognition and bio-inspired 2D optic flows (OF) to suppress the payload and the power dissipation. Among many feature-extraction methods, we implemented the histogram-of-oriented-gradients (HOG) because of its robustness against charges of illumination illumination variation and complicated background [5]. However, the HOG…

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