本文在介绍射频电路设计理论的基础上，对UHF RFID的协议及频谱规范进行深入研究整理，系统的论述了射频前端从方案提出、电路实现到性能测试的整个过程，并创新性地研究了射频前端中的许多关键技术。-This paper describes the theory of RF circuit design basis, and the spectrum UHF RFID of Xie Yi Shen Ru norms of order, the system of paper Le RF front-e

维格纳-威尔分布三维图面图，跳频信号的stft，跳频信号的维格纳-威尔分布的频谱图-Wigner- Will the distribution of three-dimensional surface maps, frequency hopping signal stft, frequency hopping signal Wigner- Will the distribution of spectrum

chirp fourier transform 线性调频Z变换(CZT) 的matlab功能函数，该方法通过CZT变换获得精确的等价于离散傅里叶变换结果的间谐波信号的频率分布估计值,可以得到精确的各次谐波和间谐波参数,利用该函数相同采样频率下该方法的检测精度更高。(This routine allows the evaluation of the DFT over an arbitrary range of frequencies as its name implies this lets y