3+1S陀螺的故障检测方法研究

在收集各类陀螺故障模式的基础上,重点讨论了卫星出现大角速度超出陀螺测量范围而出现饱和的情况,并结合卫星质量特性,给出了避免误判的对策.同时以3+1S陀螺为例,从工程的角度,给出了确定平衡方程阈值的设置过程,并针对平衡方程对陀螺漂移故障的诊断存在延迟的情况进行了改进.仿真结果表明,通过设置两个阈值,使平衡方程不仅能对突变故障进行及时有效的诊断,也大大缩短了对陀螺漂移这样的缓变故障的诊断时间.

Study of Fault Detection Method for 3+1S Gyro Unit

The angular rate saturation which the angular rate of spacecraft goes beyond the measurement range of gyroscopes was researched. The countermeasure for the miscarriage of justice based on the base of fault mode analysis was presented. The threshold of parity equation from the engineering point of view was also comfirmed and also improved parity equation was improved. The result of simulation indicates that the improved parity equation can not only detect the break fault in time but also can shorten the delay time when the slow fault such as the drift of gyroscopes is detected.