CAJ | 학술논문

为了解决缓变故障的检测和容错问题，针对容错设计中小幅度增长的缓变故障，考虑组合导航系统导航传感器的特点，提出了一种新的组合导航缓变故障容错方法。定义了滤波器观测信息的故障因子，提供了基于自回归条件异方差模型的故障因子模糊评估方法，并利用故障因子来自适应调整观测噪声协方差阵中相应的量值，从而达到抑制缓变故障的作用。通过仿真分析和实验验证了缓变故障容错方法的有效性。实验结果表明，在导航传感器发生缓变故障时，这种缓变故障容错方法可以有效地改善组合导航滤波精度。
위료해결완변고장적검측화용착문제，침대용착설계중소폭도증장적완변고장，고필조합도항계통도항전감기적특점，제출료일충신적조합도항완변고장용착방법。정의료려파기관측신식적고장인자，제공료기우자회귀조건이방차모형적고장인자모호평고방법，병이용고장인자래자괄응조정관측조성협방차진중상응적량치，종이체도억제완변고장적작용。통과방진분석화실험험증료완변고장용착방법적유효성。실험결과표명，재도항전감기발생완변고장시，저충완변고장용착방법가이유효지개선조합도항려파정도。
Addressing the issue of fault detection and fault-tolerance for gradual changing faults, a novel fault-toler-ance method of integrated navigation system was proposed for gradual changing fault with smaller extent of difficult fault-tolerance by considering the unique characteristics of the navigation sensor. The concept of fault factor and its fuzzy evaluation based on autoregressive conditional heteroskedastic( ARCH) model were presented, and then fault factor used to correct the observation noise covariance to prevent gradual changing fault from affecting the filter. Simulation and experimental analyses show the effectiveness of the method which can effectively improve the estima-ting precision of the integrated navigation system when gradual changing faults exist in system.