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首页> 外文会议>Saint Petersburg International Conference on Integrated Navigation Systems; 20060529-31; Saint Petersburg(RU) >STRAPDOWN INS SENSORS' CALIBRATION BY CELESTIAL OBSERVATIONS AND DISTINCTIVENESS OF FREE PHASE TRAJECTORY
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STRAPDOWN INS SENSORS' CALIBRATION BY CELESTIAL OBSERVATIONS AND DISTINCTIVENESS OF FREE PHASE TRAJECTORY

机译：通过天体观测和自由相轨迹的区别来校准传感器

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摘要

Major constituent of the trajectory of a ballistic vehicle is its flight in the free space where the aerodynamic forces are negligible due to insignificant air density. After the burnout point the vehicle falls freely under the influence of earth gravity. Under this special condition the accelerometer output comprises sensor's noises only. Navigation error during the free phase evolves as a function of sensors errors and alignment inaccuracy at the burnout point. The error growth rate sensitivity during the free phase to the prevailing imprecision at the burnout point is analyzed. The simulation results reveal that accelerometer's bias and velocity error at the burnout point constitute the major fraction of error accumulated during the free phase. Making use of the free fall condition for estimating the accelerometer bias and observation of distant stars for estimation of gyro drift, a technique is proposed to minimize the navigation error after the burnout point.
机译：弹道飞行器的轨迹的主要组成部分是它在自由空间中的飞行，在该自由空间中，由于空气密度微不足道，空气动力可以忽略不计。在燃尽点之后，车辆在重力的作用下自由下落。在这种特殊情况下，加速度计输出仅包含传感器的噪声。自由阶段的导航误差会根据传感器误差和燃尽点的对准误差而变化。分析了自由阶段对燃尽点普遍存在的不精确度的误差增长率敏感度。仿真结果表明，加速度计在燃尽点的偏差和速度误差是自由阶段累积误差的主要部分。利用自由落体条件来估计加速度计的偏差，并利用遥远的恒星的观测来估计陀螺仪的漂移，提出了一种将燃尽点后的导航误差降至最低的技术。

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