*-----------------------------------------------------------------------
+FILE/REFERENCE
 DESCRIPTION        Joint Center for Earth Systems Technology, UMBC, USA
 OUTPUT             ECEF satellite state vectors
 CONTACT            Erricos C. Pavlis <epavlis@umbc.edu>           
 SOFTWARE           GEODYN-II/SOLVE
 HARDWARE           Linux Cluster 
 INPUT              ILRS CRD files with SLR data    
-FILE/REFERENCE
*-----------------------------------------------------------------------
+FILE/COMMENT
*
* general:                                                                      
*
*  - file identifier:                  comments.JCET_SINEX_ILRS2008.LE12
*
* - analysis center                    JCET                                     
* - technique                          SLR                                      
* - software                           GEODYN II, SOLVE                         
* dynamic model:                                                                
* - gravity field                                                               
*   + static component                 GGM02C                                    
*   + maximum degree and order         30 x 30                                  
*   + time dependent component         JCET's 2x2 GRACE-derived set of 
*                                      secular terms, C2,0, C2,1 & S2,1 are IERS values
* - GM [m**3/s**2]                     398600.4415D9  
* - solid earth tides                  IERS2010
* - ocean tides                        Ray GOT4.7                               
* - atmospheric tides                  applied (ala Ray & Ponte, 2003)                              
* - direct solar radiation             applied
* - albedo                             applied                                  
* - earth shine                        not applied                              
* - thermal forces                     applied                                  
* - dynamic polar motion               applied                                  
* - empirical accelerations            T: constant & 1 cpr; N: 1cpr             
* - third body attraction              Sun, Earth's Moon, Mercury, Venus, Mars, 
*                                      Jupiter, Saturn, Uranus, Neptune         
*                                      from JPL's DE421                         
* - relativistic effects               applied (PPN @ GR)                       
* reference frame:                                                              
* - station coordinates                                                         
*   + a priori values                  SLRF2008                                 
*   + estimated                        all                                      
*   + reference point                  IAR for stations with zero               
*                                      ecc; site marker for others              
*   + permanent tide correction        ITRF convention                          
* - station velocities                                                          
*   + a priori values                  SLRF2008                                 
*   + estimated                        No                                      
* - earth orientation parameters                                                
*   + a priori values                  IERS C04 08                                 
*   + frequency [days]                 1                                        
*   + estimated                        yes: PM, UT1R, LODR                
* - precession                                                                  
*   + model                            IAU 2000A                                 
*   + corrections                      not applied                              
* - nutation                                                                    
*   + model                            IAU 2000A                                
*   + corrections                      not applied                      
* - station deformations:                                                       
*   + tidal uplift                     IERS2010 model                               
*   + ocean loading                    Scherneck model based on Ray GOT4.7 tide
*   + atmospheric pressure loading     NOT applied 
* - geocenter                                                                   
*   + motion                           no
*   + tidal frequencies                yes, IERS2010 model included with OL model
* - pole tide                          applied (IERS2010 including ocean PT)                                  
* - definition of origin               realized by adjusted stations'           
*                                      coordinates                              
* - definition of orientation          SLRF2008 a priori                        
*                                      (constrained at > 1 m)                   
* measurement model:                                                            
* - satellite used                      LAGEOS-1 + LAGEOS-2                     
*   +                                   ETALON-1 + ETALON-2
*
* - wavelength of observations [nm]    from ILRS QLNP data records
*
* - biases:                                                                     
*   + range biases                     estimated for some sites                
*   + time bias                        no                                      
*   + tropospheric bias                no
*
* - data weighting                     according to ILRS AWG rules
*
* - center of mass offset [m]           Site & time dependent ILRS model       
*
* - model for tropospheric delay        Mendes & Pavlis ZD & MF
*   (including mapping function)                                                
* - minimum elevation [deg]             3                                       
* - relativity scale                    LET                                     
* - speed of light [m/s]                299792458                               
* - relativistic effects                applied (GR)                            
* integration:                                                                  
* - arc length                          7 days                                 
* - integrator                          Cowell 11th order                       
* - step-size [s]                       L1: 150;  L2: 60                        
* +                                     E1 & E2:  300                           
* - estimated parameters                station coordinates at mid-arc epoch;           
*                                       EOPs at 1-day intervals;                
*                                       satellite state-vector;                 
*                                       satellite accelerations;                
*                                       weekly:
*                                       range (for non-CORE sites) 
* - constraints                         1 m on station coordinates 
*                                       and equivalent for EOPs;
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-FILE/COMMENT