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Single-axis rotation technique is often used in the marine laser inertial navigation system so as to modulate the constant biases of non-axial gyroscopes and accelerometers to attain better navigation performance. However, two significant accelerometer nonlinear errors need to be attacked to improve the modulation effect. Firstly, the asymmetry scale factor inaccuracy enlarges the errors of frequent zero-cross oscillating specific force measured by non-axial accelerometers. Secondly, the traditional linear model of accelerometers can hardly measure the continued or intermittent acceleration accurately. These two nonlinear errors degrade the high-precision specific force measurement and the calibration of nonlinear coefficients because triaxial accelerometers is urgent for the marine navigation. Based on the digital signal sampling property, the square coefficients and cross-coupling coefficients of accelerometers are considered. Meanwhile, the asymmetry scale factors are considered in the I-F conversion unit. Thus, a nonlinear model of specific force measurement is established compared to the linear model. Based on the three-axis turntable, the triaxial gyroscopes are utilized to measure the specific force observation for triaxial accelerometers. Considering the nonlinear combination, the standard calibration parameters and asymmetry factors are separately estimated by a two-step iterative identification procedure. Besides, an efficient specific force calculation model is approximately derived to reduce the real-time computation cost. Simulation results illustrate the sufficient estimation accuracy of nonlinear coefficients. The experiments demonstrate that the nonlinear model shows much higher accuracy than the linear model in both the gravimetry and sway navigation validations. 相似文献
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通过将函数迭代积分和切比雪夫多项式结合,iNavFIter算法首次将运动不可交换性误差降低到了机器截断误差级别,为新一代高精度或高动态惯性导航系统奠定了算法基础.文中利用了FPGA并行度高、灵活性强的特点,在硬件上对iNavFIter算法进行了实现,并对算法的时序和资源利用率进行了优化.该设计使用Xilinx的Kint... 相似文献
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从单应矩阵恢复相对位姿在视觉导航、视觉伺服应用中具有重要价值,证明了单应矩阵的新性质,并利用该性质改进了基于单应矩阵分解的相对位姿估计算法。与已有算法相比,该算法的候选解个数减半,并扩大了适用范围。理论分析、合成数据和真实数据测试均表明,改进方法使从候选解中筛选出唯一解的运算时间减少了50%,提高了位姿估计的总体运算效率。 相似文献
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加速度计的多位置标定精度分析与比较 总被引:2,自引:0,他引:2
在阐述加速度计组件的多位置标定方法原理的基础上,对转台误差进行了分析和建模,推导了误差的传播途径,理论分析了转台误差对多位置标定精度的影响。分析结果表明:转台外框的非正交误差主要对12位置和24位置标定精度产生影响,不水平误差主要对6位置标定精度产生影响,中框的非正交误差及转台坐标系与标定坐标系不重合误差对每种多位置标定方法的精度都存在影响,影响量级为误差量级大小。最后通过仿真验证了结论。 相似文献
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