Yes, it's an interesting topic. Someone emailed me a while ago asking if it was possible for an amateur to receive pulsar signals and so I did some looking into the whole subject. Here's a bunch of papers I found and read... Two Allan deviation graphs attached, taken from: Relativity and Timing in X-ray Pulsar Navigation -- N. Ashby and D.A. Howe http://tf.nist.gov/timefreq/general/pdf/2166.pdf Then there's this old paper, by Allan himself: Millisecond Pulsar Rivals Best Atomic Clock Stability -- D.W. Allan http://tf.nist.gov/timefreq/general/pdf/751.pdf And for extreme details on reception and corrections: Chapter 8 High-Precision Baseband Timing of 15 Millisecond Pulsars -- Aidan Wade Hotan http://adt.lib.swin.edu.au/uploads/approved/adt-VSWT20060822.151026/public/10chapter8.pdf http://adt.lib.swin.edu.au/uploads/approved/adt-VSWT20060822.151026/public/ Binary and Millisecond Pulsars at the New Millennium -- Duncan R. Lorimer http://relativity.livingreviews.org/Articles/lrr-2005-7/ http://relativity.livingreviews.org/Articles/lrr-2001-5/download/lrr-2001-5Color.pdf Some other interesting pulsar timing papers: Millisecond Pulsar Observation System At CRL -- Y. Hanado,H. Kiuchi, S. Hama, A. Kaneko, and M. Imae http://tycho.usno.navy.mil/ptti/1991/Vol%2023_34.pdf Millisecond Pulsar Observation at CRL -- Y. Hanado, M. Imae, M. Hosokawa, M. Sekido, A. Kaneko, and Y. Shibuya http://tycho.usno.navy.mil/ptti/1998/Vol%2030_08.pdf An Ensemble Pulsar Time -- G. Petit, C. Thomas, and P. Tavella http://tycho.usno.navy.mil/ptti/1992/Vol%2024_09.pdf Limits to the Stability of Pulsar Time -- G. Petit http://tycho.usno.navy.mil/ptti/1995/Vol%2027_30.pdf Application of Millisecond Pulsar Timing to the Long-Term Stability of Clock Ensembles -- R. S. Foster and D. N. Matsakis http://tycho.usno.navy.mil/ptti/1995/Vol%2027_36.pdf Pulsar-Appropriate Clock Statistics; -- D. N. Matsakis and F. J. Josties text http://tycho.usno.navy.mil/ptti/1996/Vol%2028_19.pdf Spacecraft Navigation Using X-ray Pulsars -- Suneel I. Sheikh, Demetrios Matsakis http://tycho.usno.navy.mil/IAU31/sheikh.pdf Long-term Timing at Arecibo and Green Bank -- Ingrid Stairs http://tycho.usno.navy.mil/IAU31/stairs.pdf Pulsar Clock -- D.W. Allan and G.M.R. Winkler http://tf.nist.gov/timefreq/general/pdf/661.pdf PTTI Index of papers: http://tycho.usno.navy.mil/ptti/index9.html Enjoy, /tvb