Mitigation of Pulsed Interference to Redshifted HI and OH Observations between 960 and 1215 MHz

Details Mitigation of Pulsed Interference to Redshifted HI and OH Observations between 960 and 1215 MHz Mitigation of Pulsed Interference to Redshifted HI and OH Observations between 960 and 1215 MHz

2005-02-04

arxiv.org/abs/astro-ph/0502108v1

Astronomy and Astrophysics

Astrophysics

Astronomical Journal, May 2005, in press

Scientific paper

10.1086/429528

The neutral hydrogen 21-cm spectral line (1420.4 MHz) and the four 18-cm lines of the hydroxyl molecule (1612-1720 MHz) are observable at redshifts which put their measured line frequencies well below their protected frequency bands. Part of the redshift ranges (z = 0.171-0.477 for HI and z = 0.37-0.73 for OH) fall in the 960 to 1215 MHz band that is allocated to aircraft navigation. Most of the signals in this band are pulsed emissions of low duty cycle so much of the time between pulses is interference free. This paper outlines the structure and measured properties of signals in this band and demonstrates a signal processing strategy that is effective at removing the pulsed signals from spectra at sensitivities produced by several hours of integration.

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