diff --git a/include/tudat/astro/orbit_determination/podInputOutputTypes.h b/include/tudat/astro/orbit_determination/podInputOutputTypes.h
index bafe6fd1e..544837687 100644
--- a/include/tudat/astro/orbit_determination/podInputOutputTypes.h
+++ b/include/tudat/astro/orbit_determination/podInputOutputTypes.h
@@ -120,8 +120,12 @@ class CovarianceAnalysisInput
     {
         std::cerr << "Warning, function setConstantSingleObservableAndLinkEndsWeights is deprecated, "
                      "weights should preferably be defined at the observation collection level.";
-        observationCollection_->setConstantWeightPerObservable( observationParser( std::vector< std::shared_ptr< observation_models::ObservationCollectionParser > >(
-                { observationParser( currentObservable ), observationParser( currentLinkEnds ) } ) ), weight );
+        std::map< std::shared_ptr< observation_models::ObservationCollectionParser >, double > weightsPerParser;
+        std::shared_ptr< observation_models::ObservationCollectionParser > multiTypeParser = observationParser(
+                std::vector< std::shared_ptr< observation_models::ObservationCollectionParser > >(
+                        { observationParser( currentObservable ), observationParser( currentLinkEnds ) } ) );
+        weightsPerParser[ multiTypeParser ] = weight;
+        observationCollection_->setConstantWeightPerObservable( weightsPerParser );
     }
 
     //! Set constant vector weight for all observables of given type and link ends
@@ -132,8 +136,12 @@ class CovarianceAnalysisInput
     {
         std::cerr << "Warning, function setConstantSingleObservableAndLinkEndsVectorWeights is deprecated, "
                      "weights should preferably be defined at the observation collection level.";
-        observationCollection_->setConstantWeightPerObservable( observationParser( std::vector< std::shared_ptr< observation_models::ObservationCollectionParser > >(
-                { observationParser( currentObservable ), observationParser( currentLinkEnds ) } ) ), weight );
+        std::map< std::shared_ptr< observation_models::ObservationCollectionParser >, Eigen::VectorXd > weightsPerParser;
+        std::shared_ptr< observation_models::ObservationCollectionParser > multiTypeParser = observationParser(
+                std::vector< std::shared_ptr< observation_models::ObservationCollectionParser > >(
+                        { observationParser( currentObservable ), observationParser( currentLinkEnds ) } ) );
+        weightsPerParser[ multiTypeParser ] = weight;
+        observationCollection_->setConstantWeightPerObservable( weightsPerParser );
     }
 
     //! Set constant vector weight for all observables of given type and link ends
@@ -144,8 +152,8 @@ class CovarianceAnalysisInput
     {
         std::cerr << "Warning, function setTabulatedSingleObservableAndLinkEndsWeights is deprecated, "
                      "weights should preferably be defined at the observation collection level.";
-        observationCollection_->setTabulatedWeights( observationParser( std::vector< std::shared_ptr< observation_models::ObservationCollectionParser > >(
-                { observationParser( currentObservable ), observationParser( currentLinkEnds ) } ) ), weight );
+        observationCollection_->setTabulatedWeights( weight, observationParser( std::vector< std::shared_ptr< observation_models::ObservationCollectionParser > >(
+                { observationParser( currentObservable ), observationParser( currentLinkEnds ) } ) ) );
     }
 
 
diff --git a/include/tudat/simulation/estimation_setup/observations.h b/include/tudat/simulation/estimation_setup/observations.h
index 38c3fe809..c9eb2a636 100644
--- a/include/tudat/simulation/estimation_setup/observations.h
+++ b/include/tudat/simulation/estimation_setup/observations.h
@@ -119,6 +119,11 @@ class SingleObservationSet
         return linkEnds_;
     }
 
+    void setLinkEnds( LinkDefinition& linkEnds )
+    {
+        linkEnds_ = linkEnds;
+    }
+
     std::vector< Eigen::Matrix< ObservationScalarType, Eigen::Dynamic, 1 > > getObservations( )
     {
         return observations_;
@@ -830,7 +835,7 @@ class SingleObservationSet
 
     const ObservableType observableType_;
 
-    const LinkDefinition linkEnds_;
+    LinkDefinition linkEnds_;
 
     std::pair< TimeType, TimeType > timeBounds_;
 
@@ -2139,10 +2144,10 @@ class ObservationCollection
                 }
                 break;
             }
-            case link_end_id_parser:
+            case link_end_string_parser:
             {
-                std::shared_ptr< ObservationCollectionLinkEndIdParser > linkEndIdObservationParser =
-                        std::dynamic_pointer_cast< ObservationCollectionLinkEndIdParser >( observationParser );
+                std::shared_ptr< ObservationCollectionLinkEndStringParser > linkEndIdObservationParser =
+                        std::dynamic_pointer_cast< ObservationCollectionLinkEndStringParser >( observationParser );
                 std::vector< std::string > linkEndsNames = linkEndIdObservationParser->getLinkEndNames( );
                 bool isReferencePoint = linkEndIdObservationParser->isReferencePoint( );
 
diff --git a/include/tudat/simulation/estimation_setup/observationsProcessing.h b/include/tudat/simulation/estimation_setup/observationsProcessing.h
index 94707ade4..d6c3702af 100644
--- a/include/tudat/simulation/estimation_setup/observationsProcessing.h
+++ b/include/tudat/simulation/estimation_setup/observationsProcessing.h
@@ -254,7 +254,7 @@ enum ObservationParserType
     empty_parser,
     observable_type_parser,
     link_ends_parser,
-    link_end_id_parser,
+    link_end_string_parser,
     time_bounds_parser,
     ancillary_settings_parser,
     multi_type_parser
@@ -336,22 +336,22 @@ struct ObservationCollectionLinkEndsParser : public ObservationCollectionParser
 
 };
 
-struct ObservationCollectionLinkEndIdParser : public ObservationCollectionParser
+struct ObservationCollectionLinkEndStringParser : public ObservationCollectionParser
 {
 public:
 
-    ObservationCollectionLinkEndIdParser( const std::string linkEndsNames,
+    ObservationCollectionLinkEndStringParser( const std::string linkEndsNames,
                                           const bool isReferencePoint = false,
                                           const bool useOppositeCondition = false ) :
-            ObservationCollectionParser( link_end_id_parser, useOppositeCondition ), linkEndsNames_( std::vector< std::string >( { linkEndsNames } ) ),
+            ObservationCollectionParser( link_end_string_parser, useOppositeCondition ), linkEndsNames_( std::vector< std::string >( { linkEndsNames } ) ),
             isReferencePoint_( isReferencePoint ){ }
 
-    ObservationCollectionLinkEndIdParser( const std::vector< std::string > linkEndsNames,
+    ObservationCollectionLinkEndStringParser( const std::vector< std::string > linkEndsNames,
                                           const bool isReferencePoint = false,
                                           const bool useOppositeCondition = false ) :
-            ObservationCollectionParser( link_end_id_parser, useOppositeCondition ), linkEndsNames_( linkEndsNames ), isReferencePoint_( isReferencePoint ){ }
+            ObservationCollectionParser( link_end_string_parser, useOppositeCondition ), linkEndsNames_( linkEndsNames ), isReferencePoint_( isReferencePoint ){ }
 
-    virtual ~ObservationCollectionLinkEndIdParser( ){ }
+    virtual ~ObservationCollectionLinkEndStringParser( ){ }
 
     std::vector< std::string > getLinkEndNames( ) const
     {
@@ -473,13 +473,13 @@ inline std::shared_ptr< ObservationCollectionParser > observationParser( const s
 
 inline std::shared_ptr< ObservationCollectionParser > observationParser( const std::string bodyName, const bool isReferencePoint = false, const bool useOppositeCondition = false )
 {
-    return std::make_shared< ObservationCollectionLinkEndIdParser >( bodyName, isReferencePoint, useOppositeCondition );
+    return std::make_shared< ObservationCollectionLinkEndStringParser >( bodyName, isReferencePoint, useOppositeCondition );
 }
 
 inline std::shared_ptr< ObservationCollectionParser > observationParser( const std::vector< std::string >& bodyNames,
                                                                          const bool isReferencePoint = false, const bool useOppositeCondition = false )
 {
-    return std::make_shared< ObservationCollectionLinkEndIdParser >( bodyNames, isReferencePoint, useOppositeCondition );
+    return std::make_shared< ObservationCollectionLinkEndStringParser >( bodyNames, isReferencePoint, useOppositeCondition );
 }
 
 inline std::shared_ptr< ObservationCollectionParser > observationParser( const std::pair< double, double >& timeBounds, const bool useOppositeCondition = false )