针对地面接收射电观测脉冲星信号较弱、信噪比较低的问题,提出了基于可变滑动窗口与两层3σ准则的信号去噪算法。该算法引入可变滑动窗口,对信号进行分步连续处理,同时在筛选噪声时使用两层3σ准则算法,解决了噪声遗漏及过度去噪问题。为证明算法可靠性与实用性,利用佳木斯66 m观测站实测数据进行算法验证,针对J1939+2134与J1744—1134脉冲星的实测数据进行分析处理。结果表明,该算法能够对脉冲星数据进行有效去噪,普遍提高信噪比约10dB。 Aiming at the problem of weak Pulsar signal and low signal-to-noise ratio for ground receiving radio observations, a signal denoising algorithm based on variable sliding window and two 3-level criteria is proposed. The algorithm introduces a variable sliding window to process the signals in a step-by-step manner. At the same time, a two-level 3σ criterion algorithm is used to filter the noise, which solves the problem of noise omission and over-denoising. In order to prove the reliability and practicability of the algorithm, the algorithm is verified by the measured data of 66 m station in Jiamusi, and the measured data of J1939 + 2134 and J1744-1134 pulsars are analyzed and processed. The results show that this algorithm can effectively eliminate the pulsar data and generally improve the SNR by about 10dB.