Index: /trunk/BNS/bns.cpp
===================================================================
--- /trunk/BNS/bns.cpp	(revision 797)
+++ /trunk/BNS/bns.cpp	(revision 798)
@@ -198,8 +198,8 @@
 
   QString hlp;
-  int     mjd, numSat;
-  double  sec;
-
-  in >> hlp >> mjd >> sec >> numSat;
+  int     GPSweek, numSat;
+  double  GPSweeks;
+
+  in >> hlp >> GPSweek >> GPSweeks >> numSat;
 
   for (int ii = 1; ii <= numSat; ii++) {
@@ -214,5 +214,5 @@
     xx(4) *= 1e-6;
 
-    processSatellite(mjd, sec, prn, xx);
+    processSatellite(GPSweek, GPSweeks, prn, xx);
   }
 }
@@ -220,5 +220,5 @@
 // 
 ////////////////////////////////////////////////////////////////////////////
-void t_bns::processSatellite(int mjd, double sec, const QString& prn, 
+void t_bns::processSatellite(int GPSweek, double GPSweeks, const QString& prn, 
                              const ColumnVector& xx) {
 
Index: /trunk/BNS/bnsutils.cpp
===================================================================
--- /trunk/BNS/bnsutils.cpp	(revision 797)
+++ /trunk/BNS/bnsutils.cpp	(revision 798)
@@ -24,4 +24,5 @@
 
 #include "bnsutils.h"
+#include "bnseph.h"
 
 using namespace std;
@@ -92,2 +93,52 @@
         currTime.msec()                   / 1000.0;
 }
+
+//  
+////////////////////////////////////////////////////////////////////////////
+void satellitePosition(double GPSweeks, const gpsEph* ep, 
+                       double& X, double& Y, double& Z, double& dt) {
+
+  const static double omegaEarth = 7292115.1467e-11;
+  const static double gmWGS      = 398.6005e12;
+
+  X = Y = Z = dt = 0.0;
+
+  double a0 = ep->sqrt_A * ep->sqrt_A;
+  if (a0 == 0) {
+    return;
+  }
+
+  double n0 = sqrt(gmWGS/(a0*a0*a0));
+  double tk = GPSweeks - ep->TOE;
+  double n  = n0 + ep->Delta_n;
+  double M  = ep->M0 + n*tk;
+  double E  = M;
+  double E_last;
+  do {
+    E_last = E;
+    E = M + ep->e*sin(E);
+  } while ( fabs(E-E_last)*a0 > 0.001 );
+  double v      = 2.0*atan( sqrt( (1.0 + ep->e)/(1.0 - ep->e) )*tan( E/2 ) );
+  double u0     = v + ep->omega;
+  double sin2u0 = sin(2*u0);
+  double cos2u0 = cos(2*u0);
+  double r      = a0*(1 - ep->e*cos(E)) + ep->Crc*cos2u0 + ep->Crs*sin2u0;
+  double i      = ep->i0 + ep->IDOT*tk + ep->Cic*cos2u0 + ep->Cis*sin2u0;
+  double u      = u0 + ep->Cuc*cos2u0 + ep->Cus*sin2u0;
+  double xp     = r*cos(u);
+  double yp     = r*sin(u);
+  double OM     = ep->OMEGA0 + (ep->OMEGADOT - omegaEarth)*tk - 
+                   omegaEarth*ep->TOE;
+  
+  double sinom = sin(OM);
+  double cosom = cos(OM);
+  double sini  = sin(i);
+  double cosi  = cos(i);
+  X = xp*cosom - yp*cosi*sinom;
+  Y = xp*sinom + yp*cosi*cosom;
+  Z = yp*sini;                 
+  
+  double tc = GPSweeks - ep->TOC;
+  dt = ep->clock_bias + ep->clock_drift*tc + ep->clock_driftrate*tc*tc 
+       - 4.442807633e-10 * ep->e * sqrt(a0) *sin(E);
+}
Index: /trunk/BNS/bnsutils.h
===================================================================
--- /trunk/BNS/bnsutils.h	(revision 797)
+++ /trunk/BNS/bnsutils.h	(revision 798)
@@ -5,4 +5,6 @@
 #include <QString>
 #include <QDateTime>
+
+class gpsEph;
 
 void expandEnvVar(QString& str);
@@ -15,3 +17,5 @@
 void currentGPSWeeks(int& week, double& sec);
 
+void satellitePosition(double GPSweeks, const gpsEph* ep, 
+                       double& X, double& Y, double& Z, double& dt);
 #endif