脉冲星信号去噪效果评判标准的探讨

The Study on Pulsar Signal Denoise Effect Evaluation Standard

针对目前脉冲星观测信号去噪效果没有明确评价标准的问题,从脉冲星信号在观测和科研中的实际需求出发,提出了基于脉冲到达时间(TOA)测量误差的脉冲星信号去噪效果评价标准.同时,提出基于空间屏蔽滤波器的脉冲星累积脉冲轮廓去噪算法.新的评价标准从TOA测量准确性的角度描述去噪效果的优劣,可以更好地服务于计时、导航等.采用EPN数据仿真实验证明,新的去噪算法虽然在提高信号的信噪比方面不如原有算法,但却可以显著降低TOA测量误差,为后续科研工作奠定基础.

In view of the problem that the pulsar signal denoise effect evaluation standard is not uniform,from actual demand of pulsar observation and study,a pulsar signal denoise effect evaluation standard is proposed based on time of arrival measurement error.Simultaneously,a spatial shielding filter based pulsar signal denoising algorithm is put forward.New standard evaluates the denoising effect from the view of TOA veracity,and serves better in timing,navigation and so on.The experiments,using EPN data,show that new denoising algorithm performed worse in improving signal-noise ratio,but it decreased TOA measurement error obviously,and lays a foundation for the following research.