摘要
为了有针对性的消除激光陀螺速率偏频惯导系统的可补偿寻北误差,进一步提高航向精度,从速率偏频斜装惯性仪表的数学模型出发,对陀螺和加速度计的各项误差进行了寻北误差分析,基于捷联惯导对准误差公式给出了惯性仪表各误差源的影响量级。明确了引起倾斜状态航向敏感误差的主要因素,提出了以调整激光陀螺旋转轴方向陀螺零偏抵消激光陀螺标度因数不对称性误差或者速率偏频状态陀螺零位偏移的航向敏感误差补偿措施。经转台试验验证,该措施简单可靠,有效消除了倾斜状态航向敏感误差,速率偏频系统的全方位寻北精度能够从86''(3σ)提高到优于40''(3σ)。
For the purpose of eliminating the compensable north-finding error and improving the azimuth accuracy of rate-bias laser-gyroscope navigation system,the north-seeking errors of gyro and accelerometer are analyzed based on mathematical model of rate-bias inertial sensors with tilted installation style.The affecting extent of each inertial sensor error is also deduced according to the alignment error formula of strapdown inertial navigator.Furthermore,the main error sources leading to heading-sensitive azimuth error is specifically pointed out,and a method for counteracting the gyro-bias offset and the forward-reversal asymmetry error of scale factor in the rate-bias state is presented through adjusting the equivalent gyro-bias along rotation axis.The turntable tests show that the proposed method is simple and reliable for eliminating the heading-sensitive azimuth error in tilted-state north-finding,and the accuracy of multiple-azimuth north-finding is increased from 86"(3σ)to better than 40"(3σ).
作者
江一夫
李四海
徐兵华
严恭敏
JIANG Yifu;LI Sihai;XU Binghua;YAN Gongmin(College of Automation,Northwestern Polytechnical University,Xi'an 710129,China;Xi'an aerospace precision electromechanical institute,Xi'an 710100,China)
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2018年第5期561-566,共6页
Journal of Chinese Inertial Technology
基金
航天科技集团联合基金(6141B06220404)
关键词
寻北
航向敏感误差
激光陀螺
速率偏频
north finding
heading-sensitive error
laser gyroscope
rate bias
