The use of new coordinates for the template space in hierarchical search   for gravitational waves from inspiraling binaries
  We discuss a method to analyze data from interferometric gravitational wave detectors focusing on the technique of hierarchical search to detect gravitational waves from inspiraling binaries. For this purpose, we propose new coordinates to parameterize the template space. Using our new coordinates, we develop several new techniques for two step search, which would reduce the computation cost by large amount. These techniques become more important when we need to implement a $\chi^2$-test as a detection criterion. 
Takahiro Tanaka and Hideyuki Tagoshi