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This paper focuses on unmanned aircraft guidance laws for a straight path and a circular orbit following using the vector field approach. The vector fields introduced in this paper can be applied to not only path following, but also other purposes such as arrival position, angle, and time control. Therefore, they could be applied to various missions providing advantages over other previous vector...
Planning a path to improve the performance of target localization usually requires significant computational load, so localization cannot be implemented in real time. In this study, guidance laws using vector fields, which can be implemented in real time with suboptimum performance, are introduced for a low-cost unmanned aircraft equipped with a bearing-only sensor. The proposed guidance laws using...
A guidance law which generates a coherent phantom track to deceive a radar network through a team of unmanned aerial vehicles (UAVs) is addressed. If all UAVs are located along the line of sight from their corresponding radars to the phantom then radars detect an erroneous target called a phantom beyond the location of the UAVs by using the range delay deception technique. The problem is viewed as...
This paper presents the design of algorithms to estimate the mass property, specially the moment of inertia, for the gyroless spacecraft. The gyro has several problems such as high price and frequent breakdown, but the other sensors could not replace gyro because of its update rate. However, CMOS-APS-based star tracker which is recently developed can give the vector observations in high update rate...
Hemispherical resonator gyroscope is one of the vibratory gyroscopes that can work as an angle sensor as well as an angular rate sensor. Vibratory gyroscopes have advantages that it has relatively long operation time since it has no moving part, it has relatively larger measurement range, and so on. These types of gyros are based on the principle of Coriolis effect. To operate the vibratory gyros,...
Many guidance laws for UAVs focus on path following. And trajectory tracking problem is enough when it satisfies path and time constrains. One more constraint will be considered in this research, that is, approaching direction to a terminal position. Two methods will be introduced; they are based on Pythagorean-Hodograph curve, and the Lyapunov vector field, respectively. The first algorithm consists...
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