Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://xmm.vilspa.esa.es/sas/8.0.0/doc/espfilt/node15.html
Дата изменения: Wed Jul 2 04:11:26 2008 Дата индексирования: Fri Sep 5 19:39:09 2008 Кодировка: Поисковые слова: star trail |
Below is the algorithm for the CORNER METHOD subroutine espfilt Read parameters. Call method if (method .eq. corner) then call corner_method subroutine corner_method: task evselect (to create object image) task evselect (to create object light curve) task evselect (to create corners image) task evselect (to create corners light curve) call clean_lc (to bin and smooth) subroutine clean_lc: extract columns TIME, RATE from object LC extract columns TIME, RATE from corners LC bin TIME, RATE columns from object LC bin TIME, RATE columns from corners LC smooth RATE column from object LC smooth RATE column from corners LC create histogram from object find peak of the distibution end clean_lc call gauss_fit subroutine gauss_fit: find best paramater fit using Marquardt routines: MQM maximum likelyhood fitting routine MRQ compute the matrix elements for Marquard method GFUNCS calculate gaussian function distribution return best fit end gauss_fit end corner_method elseif (method .eq. ratio) then call ratio_method subroutine ratio_method: task evselect (to create corners event list) task evselect (to extract corners spectral file) task backscale (to add area of corners region) task evselect (to create fov annulus event list) task evselect (to extract fov annulus spectral file) task backscale (to add area of fov annulus region) task evselect (to extract corners Lightcurve) task evselect (to extract fov annulus Lightcurve) extract time, counts, area for corners from spectrum and LC extract time, counts, area for fov annulus from spectrum and LC create ratio of FOV annulus to corner: ratio = fovann\_counts / corner\_counts * (corner\_time * corner\_area) / (fovann\_time * fovann\_area) extract columns TIME, RATE from object LC extract columns TIME, RATE from corners LC bin TIME, RATE columns from object LC bin TIME, RATE columns from corners LC smooth RATE column from object LC smooth RATE column from corners LC create histogram from object call clean_lc create ratio of FOV annulus to corner LC create GTI for time intervals when FOV\/corner ratio acceptable end ratio_method end call_method call write_qdp_fit subroutine write_qdp_fit open QDP output file write header, title information write out count rate histogram overlay selection and fit limits write out FOV lightcurve overlay GTIs write out Corner lightcurve overlay GTIs open ASCII gti.txt file write out GTIs to ASCII task gtibuild create GTI fits file task evselect create object filtered event list task evselect create object filtered image task evselect create corners filtered event list task evselect create corners filtered image Filtered event list, lightcurves, nice qdp plot are generated. end espfilt