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Infrared (IR) small target detection is a key technique in areas like space surveillance systems, early-warning systems and missile tracking systems etc. It is a challenging task to detect IR small targets under complex sky background because of cloud clutter. The conventional methods are usually based on clutter suppression, such as the 2D least mean square (TDLMS) adaptive filter [1], the 2D normalised...
A finite-difference time-domain method incorporating perturbation techniques is used to calculate the Q factors of resonators with variable conductivities of conductor and dielectric. Several kinds of resonator including empty cavities and a dielectric resonator are studied by this method. The numerical results are shown to be in excellent agreement with the rigorous theoretical solutions.<<ETX>>
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