PDS_VERSION_ID       = PDS3                                                   
RECORD_TYPE          = STREAM                                                 
START_TIME           = 1997-10-13T00:00:00                                    
STOP_TIME            = 1998-07-31T23:59:59                                    
DATA_SET_ID          = "MGS-M-RSS-5-SDP-V1.0"                                 
INSTRUMENT_HOST_NAME = "MARS GLOBAL SURVEYOR"                                 
TARGET_NAME          = MARS                                                   
^LATEX_DOCUMENT      = "AAS99147.TEX"                                         
^PS_DOCUMENT         = "AAS99147.PS"                                          
                                                                              
DESCRIPTION          = "                                                      
                                                                              
     This PDS document is a description of the methods used and results       
     obtained in analyzing radio tracking data from the Mars Global Surveyor  
     spacecraft while it orbited Mars during selected periods in 1997 and     
     1998.                                                                    
                                                                              
     The paper was presented to the AAS/AIAA Space Flight Mechanics           
     Meeting, Breckenridge, CO, 7-10 February 1999.  Authors: F.G. Lemoine,   
     D.D. Rowlands, D.E. Pavlis, D.S. Chinn, S.B. Luthcke, G.A. Neumann,      
     and D.E. Smith.  Title: Precise Orbit Determination for Mars Global      
     Surveyor During Hiatus and SPO.                                          
                                                                              
     The abstract reads:                                                      
                                                                              
       The Mars Global Surveyor (MGS) spacecraft arrived at Mars on           
       September 12, 1997.  The Mars Orbiting Laser Altimeter (MOLA)          
       collected data during the Hiatus Phase from October 13 to November     
       7, 1997, and during the Science Phasing Orbit (SPO) in March to        
       April 1998, and June to July 1998.  The Doppler tracking data          
       acquired from the Deep Space Network (DSN) were used to compute        
       orbits for the MOLA Science Team.  After development of tuned          
       gravity models to 70x70 in spherical harmonics with the MGS            
       tracking data, the RMS radial orbit difference of overlapping MGS      
       arcs during SPO had an overlap consistency of 30 to 35 m, compared     
       to 160 to 200 m with the a priori GMM-1 solution.  We also             
       demonstrate that the use of altimeter crossovers derived from MOLA     
       altimetry improves the MGS orbits in SPO-1 (March 27 - May 1, 1998)    
       by 15 percent (2.8 m) in the radial component, and 60 percent (600     
       m) in total position.                                                  
                                                                              
     The document is presented in two formats: a PostScript file with         
     figures and a LaTeX file of text only.                                   
                                                                              
     LaTeX is a document preparation system developed by Leslie Lamport;      
     it is a collection of TeX modules.  TeX is a document preparation        
     system developed by Donald Knuth.  For further information, see books    
     such as 'LaTeX Line By Line' by Antoni Diller (John Wiley and Sons,      
     1993, 291 p.).                                                           
                                                                              
     'PostScript' is a trademark of Adobe Systems Incorporated."              
                                                                              
OBJECT              = LATEX_DOCUMENT                                          
 DOCUMENT_NAME       = "MGS ORBIT DETERMINATION - LATEX FORMAT"               
 PUBLICATION_DATE    = 1999-02-07                                             
 DOCUMENT_TOPIC_TYPE = "GRAVITY FIELD DERIVATION"                             
 INTERCHANGE_FORMAT  = ASCII                                                  
 DOCUMENT_FORMAT     = TEXT                                                   
 FILES               = 1                                                      
 DESCRIPTION         = "                                                      
                                                                              
     LaTeX version of a paper describing analysis of radio tracking and       
     altimetry data from Mars Global Surveyor in 1997-1998.  This is a        
     single file with name AAS99147.TEX containing text only (no figures)     
     for the paper presented at the AAS/AIAA meeting.                         
                                                                              
     On some systems the characters in the extension will have to             
     be converted to lower case before the LaTeX software will work.          
     If the programs latex and dvips are available, the user should type      
     the following commands:                                                  
                                                                              
                   latex AAS99147                                             
                   dvips -o AAS99147.ps AAS99147.dvi                          
                   lpr AAS99147.ps                                            
                                                                              
     Users without these programs should consult a system                     
     administrator for advice on converting the LaTeX files.                  
                                                                              
     The LaTeX file contains an unknown number of variable-length lines of    
     readable and printable ASCII characters.  Lines are delimited by the     
     ASCII carriage-return (ASCII 13) line-feed (ASCII 10) pair."             
                                                                              
END_OBJECT          = LATEX_DOCUMENT                                          
                                                                              
OBJECT              = PS_DOCUMENT                                             
 DOCUMENT_NAME       = "MGS ORBIT DETERMINATION - POSTSCRIPT FORMAT"          
 PUBLICATION_DATE    = 1999-02-07                                             
 DOCUMENT_TOPIC_TYPE = "GRAVITY FIELD DERIVATION"                             
 INTERCHANGE_FORMAT  = BINARY                                                 
 DOCUMENT_FORMAT     = "POSTSCRIPT"                                           
 FILES               = 1                                                      
 DESCRIPTION         = "                                                      
                                                                              
     PostScript version of a paper describing analysis of radio tracking and  
     altimetry data from Mars Global Surveyor in 1997-1998.  This is a        
     single file with name AAS99147.PS containing both text and figures       
     for the paper presented at the AAS/AIAA meeting.                         
                                                                              
     The PostScript file contains an unknown number of variable-length        
     lines of readable and printable ASCII characters.  Lines are             
     delimited by the ASCII carriage-return (ASCII 13) line-feed (ASCII 10)   
     pair.  Pagination is from front to back."                                
                                                                              
END_OBJECT          = PS_DOCUMENT                                             
                                                                              
END