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The primary objective of this paper is to develop a simulation model in OPNET to implement direct sequence spread spectrum (DS-SS) code division multiple access (CDMA) system for formation flying of satellites. The focus of this paper is to model and implement seven-satellite formation, PN code generation, spreading and despreading. Simulation results are presented.
Identifying the phase-coded sequence of the binary phase-coded radar signal is a difficultly issue in the radar countermeasures. In this paper, a new approach of abstracting waveform features of the radar signal and identifying the phase-coded sequences is proposed, based on experimental model decomposition. The proposed approach can successfully identify complex phase-coded signal. Moreover, the...
Analyzing time frequency (TF) distribution of multi-component signals with noise is an important issue in signal processing of many applications. S-method (SM) is an effective multi-component TF distribution and easy to implement, but it is sensitive to noise. Aiming at the characteristics of SM, a smoothed SM (SSM) time frequency analysis method is proposed to analyze the noisy signals. SSM is a...
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