Cheetah - SKA - PSS - Prototype Time Domain Search Pipeline
cheetah/fldo/doc/FldoParam.md
1 # FLDO Configuration Guide
2 The folding portion behavior can be changed by means of some
3 input parameters. In the following discussion the configurable parameter
4 names are in _italic_ . The complete list of SKA DDD input parameters for
5 PSS can be found in PSS_Parameters.md
6 
7 FLDO receives multi-channel time-series data (a stream of filterbank data)
8 and produces dedispersed, binned (folded) profiles for each candidate in
9 input, at the given dispersion measure, period and period derivative.
10 
11 Data are organized as a succession of measures, each comprising
12 _freq_channels_ samples each referring to a different frequency. Samples
13 are integer numbers _bit_per_sample_ bits long. The measures are taken
14 every _time_resolution_ microseconds. The number of measures is
15 _integration_time_ / _time_resolution_ .
16 
17 The folding algorithm consists in a synchronous summation of input data in
18 order to improve the Signal/Noise. Input data is processed in blocks of
19 _subints_ sub-integrations. Each sub-integration is then divided in
20 _sub_bands_ bands of frequencies and corrected for dispersion.
21 Data are summed up coherently, following the pulsar period of the current candidate in
22 an array of maximum length of _phases_ phases.
23 
24 \image html subint_structure.png "Schema of data of a scan"
25 \image latex subint_structure.eps "Schema of data of a scan"