text: //$Id$
  //------------------------------------------------------------------------------
  //                             USNTrackingSystem
  //------------------------------------------------------------------------------
  // GMAT: General Mission Analysis Tool.
  //
  // Copyright (c) 2002-2011 United States Government as represented by the
  // Administrator of The National Aeronautics and Space Administration.
  // All Other Rights Reserved.
  //
  // Author: Darrel J. Conway
  // Created: 2010/02/12 by Darrel Conway (Thinking Systems)
  //
  // Developed jointly by NASA/GSFC and Thinking Systems, Inc. under the FDSS 
  // contract, Task 28
  //
  /**
   * Implementation for the USNTrackingSystem class
   */
  //------------------------------------------------------------------------------
  
  
  #ifndef USNTrackingSystem_hpp
  #define USNTrackingSystem_hpp
  
  #include "estimation_defs.hpp"
  #include "TrackingSystem.hpp"
  
  /**
   * The TrackingSystem used for the united space network
   */
  class ESTIMATION_API USNTrackingSystem : public TrackingSystem
  {
  public:
     USNTrackingSystem(const std::string &name);
     virtual ~USNTrackingSystem();
     USNTrackingSystem(const USNTrackingSystem& usn);
     USNTrackingSystem& operator=(const USNTrackingSystem& usn);
  
     virtual GmatBase* Clone() const;
  };
  
  #endif /* USNTrackingSystem_hpp */
  