We have carried out a detailed study of the single pulse of PSR J1946 + 1805 with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). We reassessed the nulling fraction (NF) to be 57.5%. We also reverted the multiple drifting modes and obtained their drifting parameters. It is found that, for this pulsar, there exists the dwarf pulse at the beginning or end of the burst state, and the duration of dwarf pulse usually is one to two pulse periods. Additionally, we observed that there are scattered dwarf pulses detected in the null state. Detailed analysis of the fraction of linear polarization for all dwarf pulse is presented. It is worth noting that relative to normal pulses these dwarf pulses have a very high fraction of linear polarization, even more than 90%. We proposed that the dwarf pulses appearing at the beginning or end of the burst state may be a common behavior, which is important to understand the physical mechanism of the process of switching between two states.

我们利用500米口径球面射电望远镜（FAST）对PSR J1946+1805的单脉冲进行了详细研究。我们重新评估归零分数 (NF) 为 57.5%。我们还还原了多种漂移模式并获得了它们的漂移参数。研究发现，该脉冲星在爆发状态的开始或结束时存在矮脉冲，矮脉冲的持续时间通常为一到两个脉冲周期。此外，我们观察到在零状态下检测到了分散的矮脉冲。对所有矮脉冲的线性偏振部分进行了详细分析。值得注意的是，相对于正常脉冲，这些矮脉冲具有非常高的线性偏振比例，甚至超过 90%。我们提出，在突发状态开始或结束时出现的矮脉冲可能是一种常见行为，这对于理解两种状态之间切换过程的物理机制非常重要。