Lanzhou is the only provincial capital city in Northwest China where the main stream of the Yellow River and its tributaries flow through the city. Due to its geographical location and the influence of various factors...
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Lanzhou is the only provincial capital city in Northwest China where the main stream of the Yellow River and its tributaries flow through the city. Due to its geographical location and the influence of various factors, it is difficult to evaluate and simulate the climatic, hydrological, and ecological processes of the main stream of the Yellow River and its tributaries in the region. In this study, the Wanchuan River basin, currently undergoing ecological restoration, was selected as the study area. Seasonal backscatter differences generated using Sentinel-1/2 (S1/S2) data and the cd algorithm were used to reduce the effects of surface roughness;vegetation indices, soils, and field measurements were used to jointly characterize the vegetation contribution and soil contribution. Then, SM maps with a grid spacing of 10 m x 10 m were generated in the Wanchuan River basin, covering an area of 1767.78 km(2). To validate the results, optimal factors were selected, and a training set and validation set were constructed. The results indicated a high level of the coefficient of determination (R-2) of 0.78 and the root mean square error (RMSE) of 0.08 for the comparison of measured and inverted water contents, indicating that the algorithm retrieved the SM values of the study area well. Furthermore, Box line plots with ERA5-Land and GLDAS confirmed that the algorithm is in good agreement with current SM products and feasibility for soil water content inversion work in the Wanchuan River basin.
In this paper,we present a novel unimodular sequence design algorithm based on the coordinate descent(cd)algorithm,aimed at countering electronic surveillance(ES)systems based on cyclostationary *** algorithm not only...
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In this paper,we present a novel unimodular sequence design algorithm based on the coordinate descent(cd)algorithm,aimed at countering electronic surveillance(ES)systems based on cyclostationary *** algorithm not only provides resistance against cyclostationary analysis(CSA)but also maintains low integrated sidelobe(ISL)***,we derive the expression of the cyclostationary feature(CSF)detector and simplify it into an iterative quadratic ***,we derive a quadratic form to ensure the similarity of the autocorrelation *** balance the minimization of the detection probability and the ISL values,we introduce a Pareto scalar that transforms the multiobjective optimization problem into a convex combination of objective *** approach allows us to find an optimal trade-off between the two ***,we propose a monotonic algorithm based on the cd algorithm to counter CSA *** algorithm efficiently solves the optimization problem mentioned *** experiments are conducted to validate the correctness and effectiveness of our proposed algorithm.
In order to improve the control precision of the existing ship autopilot and improve the adaptive capability of the autopilot,an autopilot control algorithm based on the deep confidence network(DBN) is *** of all,usin...
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In order to improve the control precision of the existing ship autopilot and improve the adaptive capability of the autopilot,an autopilot control algorithm based on the deep confidence network(DBN) is *** of all,using the contrast divergence algorithm and the data recorded in the examination system of the Shanghai Maritime University,the constrained Boltzmann machines(RBMs) that make up each DBN are pre-trained in turn,and the results are used as the depth nerve Network weight of the initial *** this basis,the back propagation algorithm is used to fine-tune the multi-layer depth *** simulation results show that the simulated sailing error between this method and the master captain is only 5.2%.
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