The US Army Research Laboratory is conducting research to explore technologies that may be suitable for maneuvering man-portable *** research is focused on the use of rotary actuators with spin-stabilized munitions.A ...
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The US Army Research Laboratory is conducting research to explore technologies that may be suitable for maneuvering man-portable *** research is focused on the use of rotary actuators with spin-stabilized munitions.A rotary actuator holds the potential of providing a low-power solution for guidance of a spinning *** is in contrast to a linear(reciprocating) actuator which would need to constantly change direction,resulting in large accelerations which in turn would require large forces,thereby driving up the actuator power.A rotational actuator would be operating at a fairly constant rotation rate once it is up to speed,resulting in much lower power *** experiments conducted over a variety of conditions validate the dynamic models of the actuator and supply the data necessary for model parameter *** performance metrics of spin rate response,friction,and power requirements were derived from the *** study indicates that this class of maneuver concepts can be driven with these *** results enable actuator design and multidisciplinary simulation of refined maneuver concepts for a specific application.
Both scattering center and polarimetric in- formation are of great significance for radar target recog- nition and classification. Firstly, a Coherent polarization attributed (CPA) scattering center model is establish...
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Both scattering center and polarimetric in- formation are of great significance for radar target recog- nition and classification. Firstly, a Coherent polarization attributed (CPA) scattering center model is established to provide a relatively complete description of the tar- get physical structure. Then, an effective parameter es- timation method is proposed, where the full-polarization echoes are used for imaging to enhance the target’s fea- tures, thereafter, the parameters of the CPA model are es- timated via image segmentation and an Approximate maxi- mum likelihood (AML) method. Particularly, the Cramer- Rao bounds (CRBs) for parameter estimation of the CPA model are derived. Experiments with the measured data in anechoic chamber validate the performance of the pro- posed method.
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