Pulsars are very stable spinning stars, which have the potential to application in the work of time-keeping and autonomous navigation in deep space. For time application, an individual pulsar can be regarded as a clock. The accuracy and stability of a pulsar clock are mainly determined by various timing noises and the measurement errors; however, they would be affected by the concrete observational strategy. Taking four millisecond pulsars from the first data released by International Pulsar Timing Array (IPTA) as an example, we investigated the influences of different observational strategies on the properties of pulsar clocks by removing some data in various ways. We find that the long-term stabilities of pulsar clocks are nearly not affected by increasing the observational cadence with a fixed time span. It is also found that the capabilities of prediction by pulsar clocks are also hardly affected by different observational strategies, which is reflected by both the stable weighted root-mean-square (wrms) and the stability of the resulting pre-fit timing residuals, unless the data span is too short or the data period is too far from the start of prediction.

脉冲星是非常稳定的自转星，具有应用于深空计时和自主导航工作的潜力。对于时间应用，可以将单个脉冲星视为时钟。脉冲星钟的精度和稳定性主要取决于各种定时噪声和测量误差；但是，它们会受到具体观测策略的影响。我们以国际脉冲星计时阵列（IPTA）发布的第一批​​数据中的4毫秒脉冲星为例，通过不同方式去除部分数据，研究了不同观测策略对脉冲星时钟特性的影响。我们发现脉冲星钟的长期稳定性几乎不受增加固定时间跨度的观测节奏的影响。