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In many antenna application cases, the phase center is not an important parameter, however, in some special cases, antenna phase center should be measured precisely. In this paper, a novel method for antenna phase center calculation is proposed. The calculation examples validate that this method is efficient and useful for actual engineering application.
This paper is proposing a practical approach for a Geosynchronous Transfer Orbit design. To design the intermediate orbits between the injection orbit and the Geosynchronous Orbit were used the Hohmann Transfer Orbit, Keppler 3rd Law and the propellant consumption equations. According to design, these intermediate orbits will be followed by a communication satellite during its orbital maneuver sequence...
This paper is proposing a practical approach for a Geosynchronous Transfer Orbit design. To design the intermediate orbits between the injection orbit and the Geosynchronous Orbit were used the Hohmann Transfer Orbit, Keppler 3rd Law and the propellant consumption equations. According to design, these intermediate orbits will be followed by a communication satellite during its orbital maneuver sequence...
Active contours have been one of the most successful methods for image segmentation during the last two decades, but one of the shortcomings of being unable to converge to concavity is a handicap to its effectiveness. In order to address this issue, the gradient vector flow (GVF) was put forth. Although there have been a great number of works on GVF, the image structure has seldom been incorporated...
Proposes a control system based on optimal control theories to improve the handling and stability of electric vehicles by direct yaw moment generated from the driving or braking forces. Simulations of a J turn and lane change are carried out to verify the effect of the control system, and the results demonstrate that the performance of the controlled electric vehicle is significantly enhanced by the...
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