Proposed technique for radio-frequency interference mitigation and sign restoration of pulsar alerts


The three-step preprocessing of PSR J1645-0317. (a) The noticed authentic information. (b) Channel saturation and huge-amplitude RFI after baseline elimination of Step 1. (c) Zooming-in particulars of the pink rectangle in panel (b). Solely an especially weak sign portion might be recognized by visible inspection. (d) Profile F with channel losses after Steps 2 and three with γ = 30. (e) Zooming-in particulars of panel (d). Credit score: The Astrophysical Journal (2022). DOI: 10.3847/1538-4357/ac8003

Pulsar alerts obtained with radio telescopes are extraordinarily weak. Usually, there are two major difficulties in pulsar sign processing—one is the radio-frequency interference (RFI) mitigation, and the opposite one is data loss because of the preprocessing and mitigation itself.

Due to this fact, the improvements in RFI elimination technique are significant to hold out additional research on the astronomical measurements, corresponding 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 technique known as “CS-Pulsar,” which carries out compressed sensing (CS) on time-frequency alerts to perform RFI mitigation and sign restoration concurrently.

The wavelet rework and discrete cosine rework have been utilized as a sparse selling time period to help 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 utility of pulsar timing, no systematic biases or underestimated uncertainties have been brought on. This technique can enhance the timing accuracy to a sure extent by decreasing the timing residuals and the estimated errors.

The outcomes have been printed in The Astrophysical Journal.

Pulse-to-pulse vitality distribution and longitude-resolved modulation properties of a FAST-CRAFTS pulsar

Extra data:
Hao Shan et al, Compressed Sensing Based mostly RFI Mitigation and Restoration for Pulsar Alerts, The Astrophysical Journal (2022). DOI: 10.3847/1538-4357/ac8003

Proposed technique for radio-frequency interference mitigation and sign restoration of pulsar alerts (2022, October 10)
retrieved 17 October 2022

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