超宽带信道的频域测量及校准

摘要

介绍了超宽带频域信道测量的方法，分析了降低测量数据准确度的因素，提出了新的校准测量方法。基于收发天线的系统传输函数，讨论了超宽带天线方向角的变化对波形畸变的影响。在暗室中采用矢量网络分析仪，测量收发天线之间不同方位角的频域传输函数，测量频率范围为0．5GHZ至16GHZ，通过频域复数除法及加权平均，消除天线等测量硬件的误差影响。将该校准测量方案运用于车载超宽带信道的测量与建模中，获得了准确的小尺度衰落信道参数。%This paper presents the ultra wide band(UWB) channel measurement method and a new calibration procedure in frequency domain. Based on the system transfer functions and the analysis of factors which decrease the measurement accuracy, the influences of the azimuthal of an UWB antenna on the waveform distortions are analyzed and discussed. The transfer functions between transmitting and receiving antennas over all the directions are measured in anechoic chamber by vector network analyzer within the frequency range of 0.5 GHz to 16 GHz. The calibration algorithm using the complex division and the weighted average is presented to eliminate the impact of measurement hardware such as antennas. This method is employed in the in-vehicle UWB channel measurement and modeling. The accurate small scale fading parameterscan be obtained.