GOMOS Processor Releases
Several successive IPF (Instrument Processor Facility) versions had been developed for the improvement of the quality of GOMOS products. The proposed changes were first implemented in a processor prototype (GOPR) and after evaluation of their impact on the Level 2 products and approval, the configuration changes were then implemented in the IPF, which was employed for operational reprocessing.
The processor software version for the operational ground segment is GOMOS/6.01. The table below shows the history of the IPF and GOPR versions released with time and the improvements applied to the GOMOS Products for each version.
| IPF | Prototype | DPM | ATBD | IODD | Product Spec | Processor updates | Operational switch date |
|---|---|---|---|---|---|---|---|
| 6.01 | GOPR 7.0 | 7 | 3 | 7 | 3K | Level 1: *Intra-pixel PRNU Level 2: *New amplitude for FCM *Error estimates computation *Error estimates coding factors | Whole Mission Reprocessed |
| 6.00 | GOPR 7.0 | 7 | 3 | 7 | 3K | Level 1: *New reflectivity Look Up Tables *New PRNU for SPB2 *New wavelength assignment *Automatic dark charge bias correction *Correction for SATU missing data Level 2: *Full Covariance Matrix (FCM) inversion *New HRTP algorithm | Since end 2010 |
| 5.01 | GOPR 6.0c-f | 6.3 | 2 | 6.2 | 3J | Level 1: *New reflectivity Look Up Tables *New PRNU for SPB2 *New wavelength assignment *Automatic dark charge bias correction *Correction for SATU missing data Level 2: *Full Covariance Matrix (FCM) inversion *New HRTP algorithm | Since 08-AUG-2006 |
| 5.00 | GOPR 6.0c-f | 6.3 | 2 | 6.2 | 3J | Level 1: *Fast photometer unfolding algorithm *Background correction for SPB *Flat field correction improvement Level 2: *DOAS optimization *Correction of HRTP algorithm *2nd Order polynomial for aerosol *Air fixed to ECMWF | 2002 - 4-JUL-2006 |
| 4.02 | GOPR 6.0a | 5.4 | 1 | 5.1 | 3H | Level 1: *Adding a new calibration parameters (these values are hard coded at the moment) * Removal of redundancy chain from code *Modifications in the processing to apply new configuration and calibration parameter * New algorithm to determine between dark, twilight and bright limb and to handle data accordingly * Added handling of source packages with invalid packet header * Added enumerations for all configuration flags | since 23 March 2004 |
| 4.00 | GOPR 5.4c - f | 5.4 | 1 | 5.1 | 3H | Level 1 * Modulation correction step added after the cosmic rays detection processing * Inversion of the non-linearity and offset corrections * Modification of the computation of theestimated background signal measured by the photometers: use the spectrometer radiometric sensitivity curve and the photometer transfer function. * Use of the dark charge map at orbit level computed from the DSA (dark sky area) if any in the level 0 product * Implementation of a new unfolding algorithm for the photometer samples Level 2 *Transmission model computation: suppress tests on valid pixels and species *Apply a Gaussian filter to the vertical inversion matrix *Very low signal values are substituted by threshold value | since 31 May 2003 |
| 3.61 | GOPR 5.4a - b | 5.3 | 3H | Level 1: *Review of some default values * New definition of one PCD flag (atmosphere) *Temporal interpolation of ECMWF data Level 2: *Depending on NFS, Apply either a Gaussian filter or a Tikhonov regularization to the vertical inversion matrix * Unit conversion applied on kernel matrix * GOMOS Atmospheric Profile (GAP): not used in this version | since 21 November 2002 |