When in autonomous modes (Loiter, RTL, Auto, etc) position errors from the GPS can cause the vehicle to think that it is suddenly in the wrong place and lead to aggressive flying to correct the perceived error. These “glitches” show up in both the tlogs and dataflash logs as an decrease in the number of satellites visible and an increase in the hdop.
可以参考ardupilot官网讲故障诊断的这句话,也就是如果hdop超过2的话,可能导致gps glitches. 飞机会以为他突然在一个错误的位置,然后急剧向应该在的位置猛烈飞行。 http://ardupilot.org/copter/docs ... html?highlight=hdop