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设计了一种可用于LED室内定位系统接收机的前端信号调理电路,详细论述了该电路的系统原理与电路构成。重点介绍了光电传感器的选型、前置预放大和滤波电路的设计方法,并且进行了噪声分析和实验测试。测试结果表明,该设计具有良好的噪声性能,探测器灵敏度可达到500nA,带宽为1MHz,满足LED定位系统接收端的性能要求,能够为后续的信号处理模块提供稳定可靠的前级信号。将该电路应用于LED室内定位实验系统,可实现小范围内的准确定位,平均定位误差仅为12.4cm。
A front-end signal conditioning circuit which can be used for LED indoor positioning system receiver is designed. The system principle and circuit structure of the circuit are discussed in detail. Focusing on the selection of photoelectric sensors, pre-amplifier and filter circuit design methods, and conducted a noise analysis and experimental testing. The test results show that the design has good noise performance, the detector sensitivity can reach 500nA and the bandwidth is 1MHz, which meets the performance requirements of the receiving end of the LED positioning system and can provide a stable and reliable pre-stage signal for the subsequent signal processing module. The circuit used in the LED indoor positioning experiment system can achieve accurate positioning within a small area, the average positioning error of only 12.4cm.