一种基于区域分集的SAR相干斑抑制算法

合成孔径雷达（ＳＡＲ）因为相干成像原理所固有的相干斑噪声是影响其图像质量的主要原因。文中根据ＳＡＲ图像的纹理特征和相干斑噪声的统计特征，提出了一种基于区域分集的相干斑抑制算法。本算法能够完全保留ＳＡＲ图像边缘特征，同时对相干斑具有较好的抑制能力。实验结果表明，本算法处理效果优于目前常用的相干斑滤波算法。

大型地源热泵埋管系统设计与施工技术研究

依托基于热响应实验实现设计预评估、深层地埋管时空转换施工、防拔式地源热泵垂直地埋管管端头、区域式地源热泵分集水器和管群热响应实效测试五大核心技术,本文在上海中冶医院项目中成功实践了地源热泵埋管系统的设计与施工技术,为可行性研究、咨询、设计、材料采购及检验、施工管理、效果验证,直至后期运行维护的所有技术环节提供了全过程一揽子解决方案。

Power Allocation for Energy Harvesting in Wireless Body Area Networks

Wireless Body Area Networks(WBANs) are expected to achieve high reliable communications among a large number of sensors.The outage probability can be used to measure the reliability of the WBAN.In this paper,we optimize the outage probability with the harvested energy as constraints.Firstly,the optimal transmit power of the sensor is obtained while considering a single link between an access point(AP) located on the waist and a sensor attached on the wrist over the Rayleigh fading channel.Secondly,an optimization problem is formed to minimize the outage probability.Finally,we convert the non-convex optimization problem into convex solved by the Lagrange multiplier method.Simulations show that the optimization problem is solvable.The outage probability is optimized by performing power allocation at the sensor.And our proposed algorithm achieves minimizing the outage probability when the sensor uses energy harvesting.We also demonstrate that the average outage probability is reduced with the increase of the harvested energy.