A system simulation environment in Matlab/Simulink of RFID is constructed in this paper. Special attention is emphasized on the analog/RF circuit.Negative effects are concerned in the system model,such as phase noise of the local oscillator,TX-RX

真实路面的函数可以描述为路面不规则函数q=q(x,y)，其x和y坐标轴分别表示纵向和侧向轴。路面不平度被描述成具有高斯分布、稳态阶段、遍历性和零均值的随机过程。因此我们可以利用自己定义的单个轨迹和相干函数的二平行轨迹的功率谱密度来描述路面不平度。自定义的单轨迹功率谱密度可用如下方程描述：-In ride comfort research, it is important to simulate the vibration of automobile on uneven road. To buil