School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Sensors (Basel). 2019 Feb 18;19(4):839. doi: 10.3390/s19040839.
As roll angle measurement is essential for two-dimensional course correction fuze (2-D CCF) technology, a real-time estimation of roll angle of spinning projectile by single-axis magnetometer is studied. Based on the measurement model, a second-order frequency-locked loop (FLL)-assisted third-order phase-locked loop (PLL) is designed to obtain rolling information from magnetic signals, which is less dependent on the amplitude and able to reduce effect from geomagnetic blind area. Method of parameters optimization of tracking loop is discussed in the circumstance of different speed and it is verified by six degrees of freedom (six degrees of freedom (DoF)) trajectory. Also, the measurement error is analyzed to improve the accuracy of designed system. At last, experiments on rotary table are carried out to validate the proposed method indicating the designed system is able to track both phase and speed accurately and stably. The standard deviation (SD) of phase error is no more than 3°.
由于滚动角测量对于二维弹道修正引信（2-D CCF）技术至关重要，因此研究了通过单轴磁力计实时估计旋转弹丸的滚动角。基于测量模型，设计了二阶锁频环（FLL）辅助三阶锁相环（PLL），以从磁信号中获取滚动信息，该方法对幅度的依赖性较小，并且能够减小地磁场盲区的影响。在不同速度的情况下讨论了跟踪环参数优化方法，并通过六自由度（六自由度（DoF））轨迹进行了验证。此外，还分析了测量误差以提高设计系统的精度。最后，在转台上进行了实验，验证了所提出的方法，表明所设计的系统能够准确，稳定地跟踪相位和速度。相位误差的标准偏差（SD）不超过 3°。
