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A variance detection (VD)-based impulse radio ultra-wideband (IR-UWB) system has the potential of mitigating narrowband interference (NBI), even in multipath environments. However, as a highly nonlinear system, which involves fourth-order multiplications, comprehensive analysis and evaluations of its performances have not been seen so far. In this paper, we address the issues by developing a log-normal...
It is necessary to investigate the lunar lander soft-landing by considering the flexible body and legs because the impact of deformation is significant. There is a new method for research on landing impact performance in this paper. Firstly a dynamical model of 1/4 lunar lander with four suspension legs is build and simplified. After getting oscillation equation of the model, founds two simulation...
Landing dynamics analysis is necessary for the success of the lunar lander soft-landing. Recent advances in computational speed have made lunar lander soft-landing modeling and simulation using a nonlinear, transient dynamics, finite element analysis code more feasible. A new approach to study the soft-landing of lunar lander has been described in this paper. The simulation of lunar lander soft-landing...
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