摘要
针对射频识别系统中标签信号在相干多径环境下难以提取的问题,提出一种采用智能天线技术来提取相干标签信号的方法。以均匀直线阵为基础,利用子阵输出的相关信息,采用前后向空间平滑技术对相干的阵列接收信号进行预处理,再用多重信号分类(MUSIC)算法正确估计出波达方向(DOA)用以提取标签信号。性能仿真和实验结果表明,该方法具有较低的信噪比门限和较高的分辨能力。
Aiming at the difficulty of RFID tag signal extraction in coherent multi-path environment, an extraction method of coherent tag signals based on smart antenna is presented. Based on uniform linear array, the received coherent array signals are preprocessed by adopting forward-backward spatial smoothing technique and taking advantage of the correlation information of subarray output. Then, by applying multiple signal classification （MUSIC） algorithm, the direction-of-arrivals （DOAs） of coherent signals are estimated properly and are used to extract the tag signals. Simulation results and experiments demonstrate that the method possesses a lower SNR threshold as well as a better resolving ability, and increases the success rate of extracting tag signals in coherent multi-path environment.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2009年第8期1640-1645,共6页
Chinese Journal of Scientific Instrument
基金
国家863计划(2006AA04A104)
国家自然科学基金(50677014
60876022)
高校博士点基金(20060532002)
湖南省科技计划(06JJ2024
2008Gk2022)资助项目
关键词
标签信号
智能天线
前后向空间平滑技术
波达方向(DOA)
tag signal
smart antenna
FBSS （forward-backward spatial smoothing） technique
direction of arrival （DOA）
