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Application of Coherent De-Dispersion DSP Algorithms in Study of Pulsar Data

B.R. Nayana, S. Madhava Kumar

Abstract


In Radio astronomy the radio-frequency signals, due to propagation through plasma, arrive in dispersed form, wherein signals with different frequencies arrive with different delays. Therefore appropriate phase or delay corrections at high spectral resolution are necessary. The process of removing the effect of dispersion is known as “De-dispersion”. Therefore signal processing techniques are crucial for detecting astronomical signals, this paper discusses relevant techniques and their application for detecting electromagnetic radiation from radio pulsars. Incoherent and coherent de-dispersion techniques are implemented and compared on a few pulsar data. De-dispersed data will aid the process of study of pulsars, wherein this paper will discuss the process of computing pulsar stokes, estimating pulsar period and dispersion measure

Keywords


De-Dispersion, Dispersion Measure (DM) Electromagnetic (EM) waves, ISM (Interstellar Medium), Radio Pulsar, Stokes

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References


T H Hankins, 1974, Removal of dispersion distortion from pulsar signals, Astronomy & Astrophysics Supplement, Vol.15, pg. 363-365.

T H Hankins, 1971, Microsecond Intensity Variations in the Radio Emissions from CP0950, The Astrophysical Journal, Vol. 169 pg. 487-494.

Coral Wheeler, 2003, Dispersion Removal , a receiver observatory REU report.

R Kippenhahn A Weigert, “Stellar Structure and Evolution” A & A Library.

G Srinivasan “What are the Stars?” University Press, 2011.

Landolt Bornstein,“Numerical Data and Functional Relationships in science and Technology” volume 4.

William J Kaufmann, III “Stars and Nebulas” Department of Physics, San Diego State University, W H Freeman, 1990.

D R Lorimer and M Kramer, Handbook of Pulsar astronomy, Cambridge University Press, 2005.

Lorimer D. R. & Kramer M., Handbook of Pulsar Astronomy, Cambridge University Press, United Kingdom, 2005

Lyne A. G.& Graham-Smith F., Pulsar Astronomy, 2nd Edition, Cambridge University Press, United Kingdom, 1998

Abmmowitz, Stegun, 1972, A hand book of mathematical functions

Gangadhara, R. T., 1996, Astron. Astrophys., 314,853.

Peyman, A., Gangadhara. R. T., 2002, Astrophys. J., 566,365.


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