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As an important weak target detection method, Duffing oscillator is very effective in detecting signals with very low signal-to-noise ratio. However, the accurate discrimination between chaotic and periodic states is a crucial problem and that is the prerequisite for using the Duffing oscillator. Conventionally, the Lyapunov exponent is used as an index to identify different states, but as this indicator...
In this paper, underwater near field sources separation and tracking method based on hydrophone array technique is proposed. Based on the acoustic wave propagation model in near field, the multiple signal classification and minimum variance beamforming method are applied. According to the maneuvering target detection strategy, an algorithm for source separation and tracking is proposed based on spatial...
As the stochastic and time-varying underwater acoustic channels with serious multipath delays, energy loss and distortion factors, making the modeling and estimation of the underwater acoustic channel have been difficult problems in academic circles. As to the multiple-input multiple-output (MIMO) underwater acoustic communication, the system model with multiplicative noise is proposed to characterize...
In recent years, the research on the resources sharing has made great progress in education area. But it is far from reaching the needs of teachers and students because of the great investment, poor management and service, low intelligence and poor scalability of present Basic Education Resources Sharing Model. With full use of the advantages of cloud computing, such as super computing ability, high...
For a flat fading code-division multiple-access (CDMA) system, by representing it as the appropriate system model consisting of state equation, multiplicative noise equation and the nonlinear measurement equation, an optimal filtering algorithm is used for joint recursive channel estimation and multiuser detection based on the established model. It should be stressed that the new algorithm is applicable...
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