Gravitational wave detection
I'm co-chair of the LSC/Virgo "pulsar group" (formally called  the Continuous Waves Investigations Group) and lead the data analysis section in the Institute for Gravitational Research. Our aim is to detect (and do science with) gravitational waves from astrophysical sources with  the UK/German GEO600 gravitational wave detector, the  LIGO Hanford/Livingston detectors in the LSC and  Virgo. 

I concentrate on  using Bayesian inference  techniques to tackle a wide range of data reduction problems in ground- and space-based  gravitational-wave astronomy.

Other/past research interests

Moon-based radio astronomy
How would you do very low frequency radio astronomy from the Moon?  See our report for ESA, my summary paper for CRIS98, and Yuki's page.  There is renewed interest in this area these days...

Interplanetary scintillation (IPS)
See the IPS homepage at this site.  We hold the only long-term 'full-sky' g-map archive in the World, revealing large-scale density transients in the solar wind.

SKA design studies
Tobia Carozzi and I looked into the widefield performance of  antenna arrays, resulting in a new formulation of the van Cittert-Zernike Theorem and a new way of characterising radio polarimetry performance.

Low-frequency long baseline interferometry
This was the subject of my PhD thesis.  A more recently generated  pdf copy is also here,  just for the record!   If nothing else this shows that 25-year-old LaTeX still compiles fine.

The 'CURSOR' radio navigation system
Peter Duffett-Smith and I developed the first (phase-based) version of this a few years ago.  Peter has developed it further into a time-based positioning system for mobile telephones and it was sold to CSR in 2007.

The Cosmic Anisotropy Telescope
I spent a couple of years on  the design and construction team for this instrument,  which made the first high resolution images of the cosmic microwave background.   See its  homepage at MRAO.