Coherent search routines
[Pulsar Packages]

Collaboration diagram for Coherent search routines:

This package provides routines to perform a demodulation on a set of data. More... In particular, this routine works with frequency domain data by combining short timescale Fourier Transforms (SFTs) into longer time baseline demodulated Fourier Transforms (DeFTs). If the assumptions under which the method was developed are met Williams1999, then the demodulation procedure concentrates the total power (within ) in a single frequency bin. In practice, due to the discretization of frequency space, this power may be shared between two neighbouring bins.

The procedure follows that outlined in Williams1999 and is part of the continuous-wave search algorithm outlined in Schutz1999. Briefly, the routine takes input SFTs, corrects for modulation effects due to intrinsic frequency spindown and Earth's motion, and outputs a DeFT of long time baseline. In general the routine can be easily adapted to correct for an arbitrary modulation effect simply by the use of a suitable timing routine, here tdb().

---