MEMS惯性高度尺测量精度分析

研究了基于微电子机械系统(micro-electro-mechanical systems,MEMS)的惯性导航系统的短时相对高程测量精度,设计了“惯性高度尺”算法,进行了桌面测高和楼层测高两个验证性实验。分析了不同运动条件和运动时间下“惯性高度尺”的测高精度。基于零速修正技术提出了一种分段测量的方法。实验结果表明,桌面测高可实现毫米级精度(相对误差0.17%),楼层测高可实现多层厘米级和单层毫米级测量精度(相对误差分别为0.22%,0.06%)。测量误差与载体的姿态动态和运动时长成正相关。实验验证了MEMS惯导用于高度测量具有较高可行性,稳定的运动条件和较快的测量时间能够提高测量精度。

Analysis on measurement accuracy of MEMS inertial height gauge

The short-time relative height elevation measurement accuracy of the inertial navigation system for micro-electro-mechanical systems (MEMS) is studied. The “inertial height gauge” algorithm is designed. Two verification experiments of desktop height measurement and floor height measurement are carried out. The measurement accuracy of the “inertial height gauge” under different motion conditions and motion duration is analyzed. A method of segmentation measurement is proposed based on the zero-velocity update technique. The experimental results show that the desktop height measurement can achieve millimeter-level accuracy (relative error 0.17%). The accuracy of floor height measurement reaches multi-layer level in the measurement of multiple floors and millimeter level in the measurement of the single floor (relative error 0.22% or 0.06%). The measurement error is positively correlated with the attitude dynamic and motion duration of the carrier. Experiments verify that the inertial navigation system for MEMS is highly feasible for height measurement, and the stable motion conditions and faster measurement time can improve the measurement accuracy.