摘要
针对声表面波(Surface Acoustic Wave,SAW)标签无线测温时延估计精度不高的问题,提出了一种新算法;为降低对硬件转换速度和采样率的要求,采用频率步进连续波(Frequency stepped continuous wave,FSCW)作标签的询问信号,利用频率粗估计和相位精估计相结合的方法提取回波时延;推导出回波时延估计的Cramer-Rao下限(CRLB),分析了相关参数对其影响;在复加性高斯白噪声条件下,利用时延估计结果进行无线测温;当起始频率为902MHz,扫描带宽为26MHz时,仿真结果证明该算法测温误差仅为频率估计算法的1/60。
A new algorithm is proposed to improve the poor performance of time delay estimation when the surface acoustic waves（SAW） tags are used for wireless measurement of temperature.The FSCW（Frequency stepped continuous wave,FSCW） concept is used for the simplicity of the hardware.The frequency and phase are both used in the algorithm to get the delay time of reflected pulses form SAW tags.The Cramer-Rao lower bound（CRLB） for the variances of estimated delay time is deduced,and the related parameters are analyzed.In the circumstances of additive Gaussian noise,estimated time delay is used to measure temperature.When the start frequency is 902MHz,the sweep bandwidth is 26MHz,the performance of the algorithm is verified by simulating,results show that the temperature error is decreased almost 1/60 of the one using frequency estimation algorithm.
出处
《计算机测量与控制》
CSCD
北大核心
2011年第7期1586-1588,共3页
Computer Measurement &Control
基金
863课题(2008AA04A104)
关键词
声表面波
温度
频率估计
相位估计
SAW
temperature
frequency estimation
phase estimation
