线加速度计辅助惯性姿态角测量的误差分析  

Error analysis on linear accelerometer-assisted inertial angular position measurement

作　　者：胡浩军[1] 马佳光[2] 

机构地区：[1]国防科学技术大学光电科学与工程学院,湖南长沙410073 [2]中国科学院光电技术研究所,四川成都610219

出　　处：《系统工程与电子技术》2006年第2期284-287,共4页Systems Engineering and Electronics

摘　　要：通过对成对的线加速度计信号的二次积分,可以得到高精度、宽带宽的惯性姿态角信号。对线加速度计辅助惯性姿态角测量的误差分析表明,测量误差由加速度计噪声、二次积分离散化、信标噪声和加速度计频率特性误差组成。对于大角度振动信号,加速度计频率特性误差是误差的主要因素。数字补偿器对加速度计频率特性误差做出修正后,测量精度得到明显提高。对3角分30 Hz单频振动,当信标以200 Hz修正累积误差时,测量误差小于1角秒。Double integration algorithm is applied to a pair of linear accelerometers to get accurate and wide bandwidth inertial angular signal. The error analysis shows that the measurement error is caused by the noise of the accelerometer, discrete double integration, noise of beacon and frequency characteristic error. For big angular vibration, the frequency characteristic error is the main error source. The precision can be improved by applying an appropriate digital compensator to the aecelerometers. For 3-arcminute, 30 Hz harmonic vibration the measurement error is less than 1 arcsecond if the sampling rate of the beacon is 200 Hz.

关 键 词：加速度计 惯性 姿态角 误差分析 

分 类 号：TN29[电子电信—物理电子学]