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The existing frequency hopping (FH) signal analysis methods have the disadvantages of poor time-frequency resolution and low noise suppression ability. Because of the large bandwidth feature of the FH signal, the time-frequency analysis methods are confined to the high sampling rate. In order to solve these problems, the compressive sensing (CS) is applied to the time-frequency analysis of FH signals...
When the continuous rigid frame bridge's actual closure temperature is higher than the design closure temperature, the closure temperature's difference will cause horizontal displacement at top of pier, and cause the structure to have the temperature intennal force. A horizontal jacking force is exerted to eliminate the adverse effect of closure temperature's difference. One calculating method of...
The intent of this paper is to investigate the shear of 4 recycled concrete simply-supported beams with same percentage of reinforntage of reinforcement and axial compressive strength but different replacement ratio of recycled aggregates. The shear failure of the recycled concrete beams is similar to that of the common concrete beams.
The intent of this paper is to investigate the shear of 4 recycled concrete simply-supported beams with same percentage of reinforntage of reinforcement and axial compressive strength but different replacement ratio of recycled aggregates. The shear failure of the recycled concrete beams are similar to that of the common concrete beams. Those are the elastic stage and the inelastic range. It is feasible...
Imaging proceduce for frequency agility multiple-input multiple-output synthetic aperture radar (MIMO-SAR) in presence of deception jamming is proposed, where the radar, at each pulse repetition interval (PRI), emits a waveform by one antenna, and the transmitted baseband signals are modulated with step carrier frequencies in successive PRIs. System model and signal model of both target echo and jamming...
It is necessary to enhance the anti-jamming capability of Synthetic Aperture Radar (SAR) for ensuring its imaging performance. A new approach to suppress wide band noise interference (WBNI) based on dechirping and eigensubspace filtering was proposed in this essay, and computer simulations were performed. All results prove that this approach can effectively suppress WBNI with negligible signal distortion...
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