Proposed methodology for radio-frequency interference mitigation and sign restoration of pulsar indicators

Pulsar indicators obtained with radio telescopes are extraordinarily weak. Usually, there are two main difficulties in pulsar sign processing—one is the radio-frequency interference (RFI) mitigation, and the opposite one is info loss as a result of preprocessing and mitigation itself.

Due to this fact, the improvements in RFI elimination methodology are significant to hold out additional research on the astronomical measurements, similar to pulsar timing.

Utilizing pulsar information collected by the NanShan 26-m Radio Telescope (NSRT) from 2011 to 2014, researchers from the Xinjiang Astronomical Observatory (XAO) of the Chinese language Academy of Sciences have proposed a novel methodology known as “CS-Pulsar,” which carries out compressed sensing (CS) on time-frequency indicators to perform RFI mitigation and sign restoration concurrently.

The wavelet remodel and discrete cosine remodel had been utilized as a sparse selling time period to assist the optimization. Outcomes confirmed that the sensing mechanism carried out higher in sign restoration for the preprocessed channels, and performed a constructive position in mitigating “on pulse” RFI.

In an software of pulsar timing, no systematic biases or underestimated uncertainties had been induced. This methodology can enhance the timing accuracy to a sure extent by decreasing the timing residuals and the estimated errors.

The outcomes had been printed in The Astrophysical Journal.