The conventional polar format algorithm (CPFA) is widely used for synthetic aperture radar (SAR) because of its simple and efficient operations. However, due to wavefront curvature assumption, the CPFA’s depth-of-focus (DOF) extremely small, which greatly limits scene size, especially high-resolution highly squinted (HRHS) SAR. To solve this problem, an extended PFA (EPFA) proposed in study, re...

Abstract We report on an extended version of the one-dimensional model proposed by Constant et al (1999 Phys. Rev. Lett. 82 1668) to study phase matching high-order harmonic generation in absorbing and dispersive medium. The model—expanded from zeroth first order—can be used with media having a pressure profile varying linearly propagation length. Based new formulas, importance medium that ends...

A novel power hardware-in-the-loop interface algorithm, the Virtual Shifting Impedance, is developed, validated and demonstrated in this paper. Building on existing algorithms, method involves shifting a part of software impedance to hardware side improve stability accuracy setups. However, compared approaches, realized by modifying command signals amplifier controller, thus avoiding requiremen...