trf.cpp

提取各种NEMA0183格式数据的类编程。

/*
** Author: Samuel R. Blackburn
** Internet: [e-mail]
**
** Copyright, 1996-2005, Samuel R. Blackburn
**
** "You can get credit for something or get it done, but not both."
** Dr. Richard Garwin
**
** BSD License follows.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** Redistributions of source code must retain the above copyright notice,
** this list of conditions and the following disclaimer. Redistributions
** in binary form must reproduce the above copyright notice, this list
** of conditions and the following disclaimer in the documentation and/or
** other materials provided with the distribution. Neither the name of
** the WFC nor the names of its contributors may be used to endorse or
** promote products derived from this software without specific prior
** written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
** $Workfile: trf.cpp $
** $Revision: 4 $
** $Modtime: 10/10/98 2:40p $
*/

#include "nmea0183.h"
#pragma hdrstop

#if defined( _DEBUG ) && defined( _INC_CRTDBG )
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#define new DEBUG_NEW
#endif // _DEBUG

TRF::TRF()
{
   Mnemonic = TEXT( "TRF" );
   Empty();
}

TRF::~TRF()
{
   Mnemonic.Empty();
   Empty();
}

void TRF::Empty( void )
{
   UTCTime.Empty();
   Date.Empty();
   Position.Empty();
   ElevationAngle              = 0.0;
   NumberOfIterations          = 0.0;
   NumberOfDopplerIntervals    = 0.0;
   UpdateDistanceNauticalMiles = 0.0;
   SatelliteID                 = 0;
   IsDataValid                 = NMEA_Unknown;
}

BOOL TRF::Parse( const SENTENCE& sentence )
{
   /*
   ** TRF - TRANSIT Fix Data
   **                                                                    13
   **        1         2      3       4 5        6 7   8   9   10  11  12|
   **        |         |      |       | |        | |   |   |   |   |   | |
   ** $--TRF,hhmmss.ss,xxxxxx,llll.ll,a,yyyyy.yy,a,x.x,x.x,x.x,x.x,xxx,A*hh<CR><LF>
   **
   ** Field Number: 
   **  1) UTC Time
   **  2) Date, ddmmyy
   **  3) Latitude
   **  4) N or S
   **  5) Longitude
   **  6) E or W
   **  7) Elevation Angle
   **  8) Number of iterations
   **  9) Number of Doppler intervals
   ** 10) Update distance, nautical miles
   ** 11) Satellite ID
   ** 12) Data Validity
   ** 13) Checksum
   */

   /*
   ** First we check the checksum...
   */

   const NMEA0183_BOOLEAN checksum_is_bad = sentence.IsChecksumBad();

   if ( checksum_is_bad == True )
   {
      InvalidChecksum();
      return( FALSE );
   } 

   UTCTime                     = sentence.Field( 1 );
   Time                        = sentence.Time( 1 );
   Date                        = sentence.Field( 2 );
   Position.Parse( 3, 4, 5, 6, sentence );
   ElevationAngle              = sentence.Double( 7 );
   NumberOfIterations          = sentence.Double( 8 );
   NumberOfDopplerIntervals    = sentence.Double( 9 );
   UpdateDistanceNauticalMiles = sentence.Double( 10 );
   SatelliteID                 = sentence.Integer( 11 );
   IsDataValid                 = sentence.Boolean( 12 );

   return( TRUE );
}

BOOL TRF::Write( SENTENCE& sentence )
{
   /*
   ** Let the parent do its thing
   */
   
   RESPONSE::Write( sentence );

   sentence += UTCTime;
   sentence += Date;
   sentence += Position;
   sentence += ElevationAngle;
   sentence += NumberOfIterations;
   sentence += NumberOfDopplerIntervals;
   sentence += UpdateDistanceNauticalMiles;
   sentence += SatelliteID;
   sentence += IsDataValid;

   sentence.Finish();

   return( TRUE );
}

const TRF& TRF::operator = ( const TRF& source )
{
   UTCTime                     = source.UTCTime;
   Time                        = source.Time;
   Date                        = source.Date;
   Position                    = source.Position;
   ElevationAngle              = source.ElevationAngle;
   NumberOfIterations          = source.NumberOfIterations;
   NumberOfDopplerIntervals    = source.NumberOfDopplerIntervals;
   UpdateDistanceNauticalMiles = source.UpdateDistanceNauticalMiles;
   SatelliteID                 = source.SatelliteID;
   IsDataValid                 = source.IsDataValid;

  return( *this );
}