基于UWB脉冲信号的测距定位技术信息与通信工程专业论文.docx

最后，分析了两种典型的超宽带定位算法：非递归的 Chan 氏算法和递 归的 Taylor 级数展开法。针对 Chan 氏算法计算简单而非视距时定位精度 低，Taylor 算法计算量大但适合于各种信道环境且定位精度高的特点，提出 Chan 氏算法和 Taylor 级数展开的联合定位方式，并在 NLOS 的 CM3 信道 下进行仿真实验。实验表明该算法在非视距(NLOS)环境下能够有效地改善 定位精度。 关键词 超宽带；脉冲无线电；两步 TOA 估计算法；联合定位  Abstract In recent years, driven by emerging technologies, Ultra Wideband (UWB) techniques have become hot research subjects, especially following the approval of the UWB technology by the FCC (Federal Communications Commission) in February 2002. And it also results in an increasing research in UWB applications. UWB impulse radio technique makes full use of ultra-short duration pulses, which yields ultra-wideband signals characterized by extremely wide frequency band and extremely low power spectral densities. UWB has many benefits, including high data rate, low transmit power, low probability of intercept, exceptional multipath immunity, low interference and accurate position localization (UWB allows up to a few centimeters ranging accuracy ranging).Whether in the military field or in the civilian field, its application is becoming wider and wider. If we accomplish wireless localization using UWB on cargo tracking, patients monitoring or searching and rescuing of urgent accident locale, we can get twice the result with half the effort. Influenced by the multipath and NLOS (Non-Line of Sight), the traditional positioning technologies such as GPS (Global Positioning System) and positioning in the mobile communication system have low positioning precision in the indoor environment. But the UWB transmission technologies have many advantages, it makes a figure among many categories of wireless location technology. Therefore, ranging and positioning based on UWB have immense advantages over these conventional methods. In this thesis, after introducing the basic principles of UWB systems, we mainly finish three tasks just described as follows: Firstly, based on the integrative analysis of former papers, the main ranging and positioning te