Question

I am searching for a good explanation of what the variables V_O, V_U, V_V, V_W, etc. are. The explanation given on page 275 of the manual is not clear and is circular (ie., VARIABLE: This is the name of the variable that will be set in all scripts run by the PCF.). What exactly are these V_x variables?

Answer

The V_O, V_U, etc variables can be set by the user (yourself) which can be used in two different places. The first place is in the input data panels. When the PCS starts, it fills in panel DAT151__.PAN.

+---------+--------------------------------------------------------------------+
|  1.5.1  |    PROCESSING: FILENAME PARAMETERS FOR AUTOMATIC PROCESSING        |
+---------+--------------------------------------------------------------------+
|                                                                              |
|    Station Parameters:                                                       |
|      $STATION1 >                  <      $STATION2 >                  <      |
|      ($i will be set to 2-char station abbrev, $STi to 4-char abbrev)        |
|                                                                              |
|    4-character Parameters:                                                   |
|      $CD1      >                <        $CD2      >                <        |
|      $CD3      >                <        $CD4      > KOON           <        |
|                                                                              |
|    3-character Parameters:                                                   |
|      $D1       > 165         <           $D2       >             <           |
|      $D3       >             <           $D4       >             <           |
|                                                                              |
|    2-character Parameters:                                                   |
|      $M   > 06       <        $O   > R3       <        $T   > 13       <     |
|      $U   > UU       <        $V   > VV       <        $W   > WW       <     |
|      $X   > EG       <        $Y   > 96       <        $Z   > EQ       <     |
|                                                                              |
|    6-character Session Parameters (+ - allowed):                             |
|      $JRSS1    > 961650 +0 -0         <  $JRSS2    > 961650               <  |
|      $JRSS3    >                      <  $JRSS4    >                      <  |
|      $JRS+1    > 961660               <  $JRS-1    > 961640               <  |
|      $JRS+2    > 961670               <  $JRS-2    > 961630               <  |
|                                                                              |
|    5-character Session Parameters (+ - allowed):                             |
|      $JRD1     > 96165 +0 -0          <  $JRD2     > 96165                <  |
|      $JRD3     >                      <  $JRD4     >                      <  |
|      $JD+1     > 96166                <  $JD-1     > 96164                <  |
|      $JD+2     > 96167                <  $JD-2     > 96163                <  |
|                                                                              |
|      $GDY1     > 08574 +0 -0          <  $GDY2     > 08574                <  |
|      $GD+1     > 08575                <  $GD-1     > 08573                <  |
|      $GD+2     > 08576                <  $GD-2     > 08572                <  |
|                                                                              |
|    4-character Session Parameters (+ - allowed):                             |
|      $SS1      > 1650 +0 -0     <        $SS2      > 1650           <        |
|      $SS3      >                <        $SS4      >                <        |
|      $S+1      > 1660           <        $S-1      > 1640           <        |
|      $S+2      > 1670           <        $S-2      > 1630           <        |
|                                                                              |
|      $GW1      > 0857 +0 -0     <        $GW2      > 0857           <        |
|      $G+1      > 0857           <        $G-1      > 0857           <        |
|      $G+2      > 0857           <        $G-2      > 0857           <        |
|                                                                              |
+------------------------------------------------------------------------------+

This is the master variable panel in the menu system. Automatic variables like day, year, session, gpsweek, etc are put here. In addition, if the V_O variable is defined, the $O field is filled out. Once this panel is filled, it is used to substitute into all the other data panels. For example the GPSEST data panels:

+---------+--------------------------------------------------------------------+
|   4.5   |                PROCESSING: PARAMETER ESTIMATION                    |
+---------+--------------------------------------------------------------------+
|                                                                              |
|     CAMPAIGN          > DOCU40_1 <    (blank for selection list)             |
|                                                                              |
|   Job Identification:                                                        |
|     JOB CHARACTER        >   <        (blank, or A..Z, 0..9)                 |
|                                                                              |
|   Input Files:                                                               |
|     PHASE S.DIFF.     > $CD4$SS2 <    (NO, if not used; blank for sel.list)  |
|     CODE  S.DIFF.     > NO       <    (NO, if not used; blank for sel.list)  |
|     COORDINATES       > $X_$Y$D1 <    (blank for selection list)             |
|     STANDARD ORBIT    > $O_$Y$D1 <    (blank for selection list)             |
|     RAD.PRESS.COE.    > NO       <    (NO, if not used; blank for sel.list)  |
|     IONOSP. MODELS    > $X_$Y$D1 <    (NO, if not used; blank for sel.list)  |
|     METEO DATA        > NO       <    (NO, if not used; blank for sel.list)  |
|     ECCENTRICITIES    > NO       <    (NO, if not used; blank for sel.list)  |
|     SATELL. CLOCKS    > NO       <    (NO, if not used; blank for sel.list)  |
|                                                                              |
+------------------------------------------------------------------------------+

Once the DAT151__.PAN file has been filled out, and you are running the BPE, the actual variable values will be substitued into their place holders in the DAT45___.PAN. So:

$CD4$SS2 ----> KOON1650
$O_$Y$D1 ----> R3_97165
$X_$Y$D1 ----> EG_97165

You can use the $O (in the panels) and $V_O variables (in the scripts) to explicitly state the orbit type. For instance, if you processed with IGS orbits you might set V_O=IG. Then if you went back and re-processed the data with the CODE orbits you could set V_O=CD. That way you would not have to go into all the panels and change the abbreviations by hand.

Last modified Thursday, 17-Nov-2005 03:58:00 UTC

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