Resolve "TDCP batch implementation"

Closes #15 (closed)

src/tdcp.cpp

@@ -34,8 +34,9 @@ TdcpOutput Tdcp(SnapshotPtr            snapshot_r,
     auto nav_k = snapshot_k->getNavigation();
     if (tdcp_params.tdcp.use_old_nav)
     {
-        snapshot_k->getSatellites().clear();
-        snapshot_k->setNavigation(snapshot_r->getNavigation());
+        auto new_snapshot_k = std::make_shared<Snapshot>(std::make_shared<Observations>(*snapshot_k->getObservations()),
+                                                         std::make_shared<Navigation>(*snapshot_k->getNavigation()));
+        snapshot_k = new_snapshot_k;
     }
 
     // COMPUTE SATELLITES POSITION
@@ -44,36 +45,35 @@ TdcpOutput Tdcp(SnapshotPtr            snapshot_r,
     if (not snapshot_k->satellitesComputed())
         snapshot_k->computeSatellites(opt.sateph);
 
+    // FILTER SATELLITES (ALREADY DISCARDED, CORRUPTED DATA, WRONG POSITION, CONSTELLATION, ELEVATION and SNR)
+    snapshot_r->filterObservations(discarded_sats, x_r, false, true, opt);
+    snapshot_k->filterObservations(discarded_sats, x_r, false, true, opt);
+
     // COMPUTE RANGES
     if (not snapshot_r->rangesComputed())
         snapshot_r->computeRanges(x_r, opt);
     if (not snapshot_k->rangesComputed())
         snapshot_k->computeRanges(x_r, opt); // the x_r is only used to compute Azels -> corrections
 
-    // FILTER SATELLITES (ALREADY DISCARDED, CORRUPTED DATA, WRONG POSITION, CONSTELLATION, ELEVATION and SNR)
-    snapshot_r->filterObservations(discarded_sats, x_r, false, true, opt);
-    snapshot_k->filterObservations(discarded_sats, x_r, false, true, opt);
-
     // FIND COMMON SATELLITES
     std::set<int> common_sats = Range::findCommonSatellites(snapshot_r->getRanges(),
                                                             snapshot_k->getRanges());
 
-    // COMPUTE TDCP
-    TdcpOutput output = Tdcp(snapshot_r,
-                             snapshot_k,
-                             x_r,
-                             common_sats,
-                             d_0,
-                             tdcp_params);
-
-    // UNDO temporary change navigation
-    if (tdcp_params.tdcp.use_old_nav)
+    if (common_sats.empty())
     {
-        snapshot_k->setNavigation(nav_k);
-        snapshot_k->computeSatellites(opt.sateph);
+        TdcpOutput output;
+        output.success = false;
+        output.msg = "No common satellites after filtering observations.";
+        return output;
     }
 
-    return output;
+    // COMPUTE TDCP
+    return Tdcp(snapshot_r,
+                snapshot_k,
+                x_r,
+                common_sats,
+                d_0,
+                tdcp_params);
 }
 
 TdcpOutput Tdcp(SnapshotPtr               snapshot_r,