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| 1 | An improved imaging algorithm for fixed-receiver bistatic SAR显示文摘Based on the signal model of fixed-receiver bistatic SAR, this paper analyzes the characteristics of azimuth-variant, which includes variation of range migration curve and variation of Doppler rate caused by different azimuth position of targets. Then, an extended nonlinear chirp scaling (NLCS) algorithm is proposed, with its flowchart and phase compensation functions being provided. Simulation results show that the algorithm is available for the characteristics of azimuth-variant of fixed-receiver bistatic SAR, and good focused radar images could be acquired. | GENG XuPu HU YingHui YAN HongHui WANG YanFei | 2010 | Science China(Information Sciences)2010，53，7： | 5 |
| 2 | Superposition Effect of Passive Intermodulation for Cable Assemblies with Discrete Point-Sources显示文摘In order to expand the cell coverage of wireless cellular systems, the number of passive components in wireless systems has been substantially increased. There can be many passive intermodulation(PIM) pointsources even in a device or a radio link, which may add up constructively or destructively. A modified point-source model with lossy components is proposed to evaluate the superposition effect of the forward and refl ected PIM in case of series connection. The index of the series connection factor(SCF) is employed for systems that incorporate multiple PIM sources to predict the important characteristics of the cumulative PIM, such as the maximum and minimum values and the limit form. Furthermore, some initial experimental results are given out and the deviation in the above-mentioned prediction is also analyzed. | ZHAO Pei ZHANG Xupu YANG Dacheng HU Xiaoyan | 2015 | China Communications2015，12，4： | 3 |
| 3 | Spatial expansion effects on urban ecosystem services supply-demand mismatching in Guanzhong Plain Urban Agglomeration of China显示文摘Global urbanization has led to drastic land use change,interfering the ecosystem services(ES)supply-demand balance,in turn threatening the well-being of humans.However,existing studies mainly stranded at the historical and current analysis,and the effects of urban spatial expansion on the relationship between ES supply and demand in the future are less clear,in particular at an urban agglomeration scale.This study was constructed with a framework of assessing the effects of urban spatial expansion on ES supply-demand mismatching under different future scenarios in the Guanzhong Plain Urban Agglomeration(GPUA)by using the Future Land Use Simulation(FLUS)model and expert-based Land-Use and Land-Cover Change(LUCC)matrix.The results showed that:(1)Urban expansion is significant in the natural development(ND)scenario,mainly manifesting the great transfer of dry land to construction land.(2)The gap between total ES supply and demand is narrowed from 2000 to 2030 and the mismatch between ES supply and demand is mainly reflected in the spatial distribution pattern in the GPUA.The ES budgets were in high surplus in Northern Qinling Mountains and northeast mountain areas,while they were in severe deficit in urban center areas.The budgets deficit under the ND scenario in 2030 is the most severe.(3)The gradient differences of ES budgets of the GPUA between urban centers and suburbs increase from 2000 to 2030 under two scenarios.The deficit region expands largest under ND scenario.The findings revealed that ES declining and supply-demand mismatching were triggered by the drastic land-use change driven by rapid urban expansion.The expansion has brought about an increasing material demand and growing industries,threatening the sustainability of ecosystems.Scenarios setting could contribute to coordinating the relationship between future urban development and ecological protection,and the policy strategies proposed in the study could inform ecological management and urban planning in the regions facing the similar urbanization situation. | PENG Lixian ZHANG Liwei LI Xupu WANG Zhuangzhuang WANG Hao JIAO Lei | 2022 | Journal of Geographical Sciences2022，32，5： | 2 |
| 4 | A two-dimensional spectrum model for general bistatic SAR显示文摘 | GENG Xupu YAN Honghui WANG Yanfei | 2008 | IEEE Trans Geosci Remote Sens2008，46，8： | 1 |
| 5 | A two-dimensional spectrum model for general bistatic SAR显示文摘 | GENG Xupu YAN Honghui WANG Yanfei | 2008 | IEEE Trans Geosci Remote Sens2008，46，8： | 1 |
| 6 | A Two-Dimensional Spectrum Model for General Bistatic SAR显示文摘 | Xupu Geng Honghui Yah Yanfei Wang | 2008 | IEEE Transactions on Geoscience and Remote Sensing2008，46，8： | 1 |
| 7 | A two- dimensional spectrum model for general bistatie SAR 显示文摘 | GENG Xupu YAN Honghui WANG Yanfei | 2008 | IEEE Transactions on Geoscience and Remote Sensing2008，46，8： | 1 |
| 8 | A high-resolution direction-of-arrival estimation based on Bayesian method显示文摘A Bayesian high-resolution direction-of-arrival (DOA) estimator is proposed based on the maximum a posteriori principle. The statistical performance of the Bayesian highresolution DOA estimator is also investigated. Comparison with MUSIC and Maximum likelihood estimator (MLE) shows that the Bayesian method has higher resolution and more accurate estimates for either incoherent or coherent sources. It is also more robust in the case of low SNR. | HUANGJianguo SUNYi XUPu LUYing LIUKewei | 2004 | Chinese Journal of Acoustics2004，23，1： | 0 |
| 9 | Ocean surface current retrieval at Hangzhou Bay from Himawari-8 sequential satellite images显示文摘Ocean surface currents play a key role in the earth’s climate.They affect virtually all processes occurring in the ocean and can also directly affect many important socio-economic activities.Himawari-8 meteorological satellite has an international advanced geostationary orbit imager sensor,AHI,with high time resolution and spatial coverage,Himawari-8 can be used to observe the subtle changes in marine environments.In this study,we used Himawari-8 data received from the Joint Receiving Station for Satellite Remote Sensing of Xiamen University to retrieve coastal currents in Hangzhou Bay.Particularly,the Maximum Correlation Coefficient(MCC)and the Generalized Hough Transform(GHT)methods were used to retrieve them respectively.The retrieved sea surface currents are analyzed and verified by the numerical model data of the Taiwan Strait current forecasting system(TFOR).The results show that(1)the Himawari-8 satellite data can be used to effectively estimate the ocean current;(2)The results of the two methods are in agreement with each other,and the error in the current measured using the GHT method is smaller in the Yangtze estuary and offshore areas,where the turbidity characteristic front is stronger. | Zhenye ZHU Xupu GENG Shihui LI Ting XIE Xiao-Hai YAN | 2020 | Science China Earth Sciences2020，63，7： | 0 |
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