为了解决基于蓝牙射频RSS的室内定位算法精度低、实时性差等问题,提出一种融合到达角(Angle of Arrival,AOA)与射频RSS的K近邻指纹定位算法,通过采集NRF51822传感器的射频RSS聚类信号形成定位指纹库,采用KNN欧式最优算法与指纹库进行匹...为了解决基于蓝牙射频RSS的室内定位算法精度低、实时性差等问题,提出一种融合到达角(Angle of Arrival,AOA)与射频RSS的K近邻指纹定位算法,通过采集NRF51822传感器的射频RSS聚类信号形成定位指纹库,采用KNN欧式最优算法与指纹库进行匹配得出近似坐标位置,设计一款小型PCB八木天线模拟定位基站,补偿射频RSS随距离、遮挡等造成的信号接收强度指示(Received Signal Strength Indicator,RSSI)跳变、衰减,通过信标与定位节点的AOA到达角与最优指纹数据的权值归一化换算,得出最终定位坐标。实验结果表明,该算法具有定位精度高、实时性好等优点,具有较高的推广价值。展开更多
In this paper,a novel polygeneration system involving plasma gasifier,pyrolysis reactor,gas turbine(GT),supercritical CO_(2)(S-CO_(2))cycle,and organic Rankine cycle(ORC)has been developed.In the proposed scheme,the s...In this paper,a novel polygeneration system involving plasma gasifier,pyrolysis reactor,gas turbine(GT),supercritical CO_(2)(S-CO_(2))cycle,and organic Rankine cycle(ORC)has been developed.In the proposed scheme,the syngas is obtained by the gasification and the pyrolysis is first burned and drives the gas turbine for power generation,and then the resulting hot exhaust gas is applied to heat the working fluid for the supercritical CO_(2)cycle and the working fluid for the bottom organic Rankine cycle.In addition to the electrical output,the pyrolysis subsystem also produces pyrolysis oil and char.Accordingly,energy recovery is achieved while treating waste in a non-hazardous manner.The performance of the new scheme was examined by numerous methods,containing energy analysis,exergy analysis,and economic analysis.It is found that the net total energy output of the polygeneration system could attain 19.89 MW with a net total energy efficiency of 52.77%,and the total exergy efficiency of 50.14%.Besides,the dynamic payback period for the restoration of the proposed project is only 3.31 years,and the relative net present value of 77552640 USD can be achieved during its 20-year lifetime.展开更多
文摘为了解决基于蓝牙射频RSS的室内定位算法精度低、实时性差等问题,提出一种融合到达角(Angle of Arrival,AOA)与射频RSS的K近邻指纹定位算法,通过采集NRF51822传感器的射频RSS聚类信号形成定位指纹库,采用KNN欧式最优算法与指纹库进行匹配得出近似坐标位置,设计一款小型PCB八木天线模拟定位基站,补偿射频RSS随距离、遮挡等造成的信号接收强度指示(Received Signal Strength Indicator,RSSI)跳变、衰减,通过信标与定位节点的AOA到达角与最优指纹数据的权值归一化换算,得出最终定位坐标。实验结果表明,该算法具有定位精度高、实时性好等优点,具有较高的推广价值。
基金supported by the National Natural Science Fund of China(No.52106008)Science Fund for Creative Research Groups of the National Natural Science Foundation of China(No.51821004)Science and Technology Planning Project of Guangdong Province(No.2020B1212060048).
文摘In this paper,a novel polygeneration system involving plasma gasifier,pyrolysis reactor,gas turbine(GT),supercritical CO_(2)(S-CO_(2))cycle,and organic Rankine cycle(ORC)has been developed.In the proposed scheme,the syngas is obtained by the gasification and the pyrolysis is first burned and drives the gas turbine for power generation,and then the resulting hot exhaust gas is applied to heat the working fluid for the supercritical CO_(2)cycle and the working fluid for the bottom organic Rankine cycle.In addition to the electrical output,the pyrolysis subsystem also produces pyrolysis oil and char.Accordingly,energy recovery is achieved while treating waste in a non-hazardous manner.The performance of the new scheme was examined by numerous methods,containing energy analysis,exergy analysis,and economic analysis.It is found that the net total energy output of the polygeneration system could attain 19.89 MW with a net total energy efficiency of 52.77%,and the total exergy efficiency of 50.14%.Besides,the dynamic payback period for the restoration of the proposed project is only 3.31 years,and the relative net present value of 77552640 USD can be achieved during its 20-year lifetime.
