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Under GPS-denied conditions, an inertial navigation diverges easily due to integration drift in the measurement of acceleration and angular velocity. Therefore, a terrain relative navigation (TRN) is applied to correct the drift error for precise lunar landing mission. Diverse sensors are used for the TRN in these days, such as a Light and Detection and Ranging (LIDAR), laser altimeter, and optical...
As the importance of military usage of Unmanned Aerial Vehicle (UAV) increases, developing cost-effective UAV system is also being emphasized. In this paper, we integrated Predictive Ground Collision Avoidance System (PGCAS) used in military jet fighters into UAV to develop a low-cost flying safety system that can help an operator to concentrate fully on their missions setting aside the danger of...
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...
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...
A lunar orbital capture guidance law is presented for a spacecraft with electrical propulsion system using Lyapunov feedback control approach. Construction of the Lyapunov function candidate is based on orbital elements which consist of angular momentum and eccentricity vectors. Unlike the orbit transfer problem between closed orbits, the lunar capture problem has two constraints. One thing is that...
Using Fisher Information Matrix (FIM), the optimal trajectory to localize a specifc target is obtained as optimization problem. However, it is more effective to employ more vehicles with various sensors in order to gather suffcient information about the target. So, it is investigated how multi vehicles with different types of sensors by cooperative maneuver affect the trajectory in this paper. Clearly...
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