Interference Detection in Gaussian Noise

Baddi, Raju

doi:10.1088/0004-6256/141/6/190

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…All the profiles are compatible with a gaussian fit. From this, one can deduce that the number density of electrons n e to have an upper cutoff of 10cm −3 (Baddi 2011b;Baddi 2012) in ELDWIM. At this density and frequency the pressure broadening contribution is ∼ 10 kms −1 .…”

Section: Distribution Of Eldwim In the Inner Galaxymentioning

confidence: 91%

“…Due to presence of interference the spectra(T on /T of f − 1) had to be intermittently inspected during averaging. This was done using an algorithm (Baddi 2011a) which detected interference and clipped it. The clipped portion was replaced by noise of equivalent standard deviation corresponding to the spectrum plus a baseline connecting the average of a few channel values adjacent to the two sides of the interference infected region.…”

Section: Data Analysis and Calibrationmentioning

confidence: 99%

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A SURVEY OF RADIO RECOMBINATION LINES USING THE OOTY RADIO TELESCOPE AT 328 MHz IN THE INNER GALAXY

Baddi¹

2011

The Astronomical Journal

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A survey of radio recombination lines in the Galactic plane with longitude −32 o < l < +80 o and latitude b < ±3 o using Ooty Radio Telescope(ORT) at 328 MHz has been reported. ORT observations were made using a New Digital Backend(NDB) augmented to it recently. With NDB ORT had a beam of 2 o .3 × 2 o .2sec(δ) and a passband of ∼1 MHz in the spectral line mode. The above mentioned Galactic region was divided into ∼ 2 o × 2 o patches with the ORT beam pointed to the center. The ORT observations form a study of distribution of extended low-density warm-ionized medium(ELDWIM) in the inner Galaxy usingH271α RL. By obtaining kinematical distances using V LSR of the H271α RLs the distribution of ELDWIM clouds within the inner Galaxy has been deduced for the region given above.

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Section: Distribution Of Eldwim In the Inner Galaxymentioning

confidence: 91%

Section: Data Analysis and Calibrationmentioning

confidence: 99%

A SURVEY OF RADIO RECOMBINATION LINES USING THE OOTY RADIO TELESCOPE AT 328 MHz IN THE INNER GALAXY

Baddi¹

2011

The Astronomical Journal

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Fourier domain excision of periodic radio frequency interference

Maan

Leeuwen

Vohl

2021

A&A

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The discovery and study of pulsars and fast radio bursts (FRBs) in time-domain radio data is often hampered by radio frequency interference (RFI). Some of this terrestrial RFI is impulsive and bright, and relatively easy to identify and remove. Other anthropogenic signals, however, are weaker yet periodic, and their persistence can drown out astrophysical signals. Here we show that Fourierdomain excision of periodic RFI is an effective and powerful step in detecting weak cosmic signals. We find that applying the method significantly increases the signal-to-noise ratio of transient and periodic pulsar signals. In live studies we detected single pulses from pulsars and FRBs that would otherwise have remained buried in background noise. We show the method has no negative effects on pulsar pulse shape, and that it enhances timing campaigns. We demonstrate the method on real-life data from a number of large radio telescopes, and conclude that Fourier-domain RFI excision increases the effective sensitivity to astrophysical sources by a significant fraction, which can be even larger than an order of magnitude in the case of strong RFI. An accelerated implementation of the method runs on standard time-domain radio data formats and is publicly available.

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RRL OBSERVATIONS USING ORT AT 328 MHz AND WSRT AT 1.4 GHz FROM ELDWIM

Baddi

2012

The Astronomical Journal

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Interference Detection in Gaussian Noise

Cited by 3 publications

References 4 publications

A SURVEY OF RADIO RECOMBINATION LINES USING THE OOTY RADIO TELESCOPE AT 328 MHz IN THE INNER GALAXY

A SURVEY OF RADIO RECOMBINATION LINES USING THE OOTY RADIO TELESCOPE AT 328 MHz IN THE INNER GALAXY

Fourier domain excision of periodic radio frequency interference

RRL OBSERVATIONS USING ORT AT 328 MHz AND WSRT AT 1.4 GHz FROM ELDWIM

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