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| 1 | An Improved Kalman Filter Positioning Method in NLOS Environment显示文摘In the precision positioning system, NLOS(Non Line of Sight) propagation and clock synchronization error caused by multiple base stations are the main reasons for reducing the reliability of communication and positioning accuracy. So, in the NLOS environment, it has an important role to eliminate the clock synchronization problem in the positioning system. In order to solve this problem, this paper proposes an improved Kalman filter localization method NLOS-K(Non Line of Sight-Kalman filter). First, the maximum likelihood estimation algorithm is used to iterate. Then, the Kalman filter algorithm is implemented and the Kalman gain matrix is redefined. The clock drift is compensated so that the clock between the master and slave base stations remains synchronized. The experimental results show that in the non-lineof-sight environment, compared with other algorithms, the positioning accuracy error of the improved algorithm is about 5 cm, and the accuracy compared with other algorithms is 97%. In addition, the influence of bandwidth and spectral density on the method is analyzed, and the accuracy and stability of positioning are improved as a whole. | Zhanjun Hao Beibei Li Xiaochao Dang | 2019 | China Communications2019，16，12： | 4 |
| 2 | 带通TRPC-UWB通信系统中的相位噪声性能分析显示文摘相位噪声是带通通信系统设计及实现中必须考虑的关键问题之一。以带通传输参考脉冲簇(Transmitter Reference Pulse Cluster,TRPC)超宽带(Ultra-wideband,UWB)通信系统为研究对象,分析了由发射机端及接收机端晶体振荡器所产生的相位噪声对系统误码性能的影响。利用相位噪声的一般性模型,推导了存在相位噪声情况下的系统误码率理论表达式,进而评估在密集多径传播环境中相位噪声对TRPC-UWB通信系统误码性能的影响。最后,给出了在实际的IEEE 802.15.4a信道模型中以及存在相位噪声的情况下,TRPCUWB通信系统误码性能的半解析实验结果。 | 梁中华 | 2018 | 激光杂志2018，39，7： | 0 |
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