基于FPGA的无源TPMS定点小数除法

Implementation of fixed-point decimal division of passive TPMS based on FPGA

为高精度提取SAW传感器的信息,提高传感器的测量精度和灵敏度,进一步减小测量误差,利用FPGA实现数字信号下变频,对信号实行中频采样,使得A/D变换的采样通道数由传统模拟式I、Q检波时的双通道变为对中频直接采样的单通道,运用定点小数除法实现基带信号I、Q的相位处理,提高了相位检测精度。仿真结果表明,基于FPGA的不恢复余数法小数除法算法达到了设计的要求,同时也说明了基于FPGA的定点小数除法具有相当高的精确度。

In order to extract the information of SAW sensors with high precision, improve the sensor＇ s accuracy and sensitivity, and reduce the measurement error further. It is implemented digital signal down converter by cy- clone series FPGA made in ALTERA company, and the implementation of the signal sampling, what makes the A/ D transformation of the sample from the traditional analog channels I, Q demodulation into two channels when direct sampling of the IF channel. The use of fixed-point decimal division to achieve the base band signal I, Q phase of treatment to improve the accuracy of phase detection. The simulation results not only show that the FPGA-based method that does not restore the balance decimal division algorithm to achieve the design requirements, but also show that the fixed-point FPGA-based division has a very high decimal precision.