基于可变滑动窗口与3σ准则的脉冲星信号去噪算法

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。

De-Noising Method for Pulsar Signals Based on Alterable Moving Window and 3σ-Rule

In order to increase the profile of signal-noise ratio of pulsar signals from surface observation,a de-noising method based on alterable moving window and two-tiered 3σ-rule is proposed in this paper.According to alterable moving window in this method,pulsar signals are processed step by step continuously to avoid missing noise.Using two-tiered 3σ-rule to filter noise can prevent excessive de-noising.The observed data of J1939-+ 2134 and J1744-1134 by the Jiamusi 66 m telescope at Jiamusi deep space station is used for validation.The result shows that this method can promote signal-noise ratio obviously and remove the noise effectively.