一种基于UWB测距信号信噪比的优化定位方法

An Optimized Positioning Method Based on the SNR of UWB Ranging Signals

针对超宽带(ultra-wide band,UWB)室内定位中测距信号的信噪比与测距误差间成负相关的关系,提出了一种基于超宽带测距信号信噪比(signal-noise ratio,SNR)的定权优化模型。通过该定权模型,能对具有较大信噪比的测距值赋相对较大的权值,从而提高超宽带室内定位精度。实验结果表明,该定权模型能够有效提高超宽带室内定位精度。静态试验以全站仪测量结果为真值,点位误差为3.7 cm,相对于未定权时的定位精度提高90%,动态试验结果更接近实际轨迹,且减少了偶然误差。

According to the negative correlation between the signal-to-noise ratio of the ranging signal and the ranging er⁃ror in ultra-wideband indoor positioning,this paper proposes a fixed-weight model based on the signal-to-noise ratio of the ultra-wideband ranging signal.Through the fixed weight mod⁃el,a larger weight is assigned to the ranging value with a larg⁃er signal-to-noise ratio,and the accuracy of ultra-wideband in⁃door positioning is improved.Experimental results show that the fixed-weight model can effectively improve the accuracy of ultra-wideband indoor positioning.The static test takes the measurement result of the total station as the true value,and the point position error is 3.7cm.Compared with the undeter⁃mined weight method,the accuracy is increased by 90%.The dynamic test results are closer to the actual trajectory,and accidental errors are reduced.