#pragma ident "$Id: icd_200_constants.hpp 591 2007-06-10 17:50:56Z architest $"/** * @file icd_200_constants.hpp * Constants as defined in the GPS-ICD-200 * Now the IS-GPS-200D */#ifndef GPSTK_ICD_200_CONSTANTS_HPP#define GPSTK_ICD_200_CONSTANTS_HPP//============================================================================////  This file is part of GPSTk, the GPS Toolkit.////  The GPSTk is free software; you can redistribute it and/or modify//  it under the terms of the GNU Lesser General Public License as published//  by the Free Software Foundation; either version 2.1 of the License, or//  any later version.////  The GPSTk is distributed in the hope that it will be useful,//  but WITHOUT ANY WARRANTY; without even the implied warranty of//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the//  GNU Lesser General Public License for more details.////  You should have received a copy of the GNU Lesser General Public//  License along with GPSTk; if not, write to the Free Software Foundation,//  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA//  //  Copyright 2004, The University of Texas at Austin////============================================================================//============================================================================////This software developed by Applied Research Laboratories at the University of//Texas at Austin, under contract to an agency or agencies within the U.S. //Department of Defense. The U.S. Government retains all rights to use,//duplicate, distribute, disclose, or release this software. ////Pursuant to DoD Directive 523024 //// DISTRIBUTION STATEMENT A: This software has been approved for public //                           release, distribution is unlimited.////=============================================================================namespace gpstk{      /**       * @addtogroup geodeticgroup       * @name GPS Constants       * Time constants are in the time library.       */      //@{      /// GPS value of PI   const double PI        = 3.1415926535898;      /// GPS value of PI*2   const double TWO_PI    = 6.2831853071796;      /// GPS value of PI**0.5   const double SQRT_PI   = 1.7724539;      /// relativity constant for GPS (sec/sqrt(m))   const double REL_CONST = -4.442807633e-10;      /// Hz   const double OSC_FREQ  = 10.23e6;      /// Hz, chip rate of the P & Y codes   const double PY_CHIP_FREQ = OSC_FREQ;      /// Hz, chip rate of the C/A code   const double CA_CHIP_FREQ = OSC_FREQ / 10.0;      /// speed of light (m/s)   const double C_GPS_M = 2.99792458e8;      /// Base freq w/o relativisitic effects, Hz.   const double RSVCLK    = 10.22999999543e6;      /// L1 carrier frequency in Hz.   const double L1_FREQ   = 1575.42e6;      /// L1 carrier wavelength in meters.   const double L1_WAVELENGTH  = 0.190293672798;      /// L2 carrier frequency in Hz.   const double L2_FREQ   = 1227.60e6;      /// L2 carrier wavelength in meters.   const double L2_WAVELENGTH  = 0.244210213425;      /// L1 multiplier.   const double L1_MULT   = 154.0;      /// L2 multiplier.   const double L2_MULT   = 120.0;      /// Gamma multiplier.   const double GAMMA_GPS = 1.646944444;   // Modernized GPS      /// L5 carrier frequency in Hz.   const double L5_FREQ   = 1176.45e6;      /// L5 carrier wavelength in meters.   const double L5_WAVELENGTH  = 0.254828049;   // Galileo-related      /// L6 carrier frequency in Hz.   const double L6_FREQ   = 1278.75e6;      /// L6 carrier wavelength in meters.   const double L6_WAVELENGTH  = 0.234441805;      /// L7 carrier frequency in Hz.   const double L7_FREQ   = 1207.140e6;      /// L7 carrier wavelength in meters.   const double L7_WAVELENGTH  = 0.24834937;      /// L8 carrier frequency in Hz.   const double L8_FREQ   = 1191.795e6;      /// L8 carrier wavelength in meters.   const double L8_WAVELENGTH  = 0.251547001;      /// constant for the max array index in sv accuracy table   const int SV_ACCURACY_MAX_INDEX_VALUE = 15;      /// map from SV accuracy/URA flag to minimum accuracy values in m   const double SV_ACCURACY_MIN_INDEX[] = {0.0, 2.4, 3.4, 4.85, 6.85, 9.65,                                           13.65, 24.0, 48.0, 96.0, 192.0,                                           384.0, 768.0, 1536.0, 3072.0,                                           6144.0};      /// Map from SV accuracy/URA flag to NOMINAL accuracy values in m      /// Further details in ICD-GPS-200C, section 20.3.3.3.1.3   const double SV_ACCURACY_NOMINAL_INDEX[] = {2.0, 2.8, 4.0, 5.7, 8.0,                                           11.3, 16.0, 32.0, 64.0, 128.0,                                           256.0, 512.0, 1024.0, 2048.0,                                           4096.0, 9.999999999999e99};      /// map from SV accuracy/URA flag to maximum accuracy values in m   const double SV_ACCURACY_MAX_INDEX[] = {2.4, 3.4, 4.85, 6.85, 9.65,                                           13.65, 24.0, 48.0, 96.0, 192.0,                                           384.0, 768.0, 1536.0, 3072.0,                                           6144.0, 9.999999999999e99};   inline   short accuracy2ura(const double& acc) throw()   {      short ura = 0;      while ( (ura <= SV_ACCURACY_MAX_INDEX_VALUE) &&              (acc > SV_ACCURACY_MAX_INDEX[ura]))         ura++;      if (ura > SV_ACCURACY_MAX_INDEX_VALUE)         ura = SV_ACCURACY_MAX_INDEX_VALUE;      return ura;   }      inline   double ura2accuracy(const short& ura) throw()   {      if(ura < 0)         return SV_ACCURACY_MAX_INDEX[0];      if(ura > SV_ACCURACY_MAX_INDEX_VALUE)         return SV_ACCURACY_MAX_INDEX[SV_ACCURACY_MAX_INDEX_VALUE];      return SV_ACCURACY_MAX_INDEX[ura];   }   inline   short nominalAccuracy2ura(const double& acc) throw()   {      short ura = 0;      while ( (ura <= SV_ACCURACY_MAX_INDEX_VALUE) &&              (acc > SV_ACCURACY_NOMINAL_INDEX[ura]))         ura++;      if (ura > SV_ACCURACY_MAX_INDEX_VALUE)         ura = SV_ACCURACY_MAX_INDEX_VALUE;      return ura;   }      inline   double ura2nominalAccuracy(const short& ura) throw()   {      if(ura < 0)         return SV_ACCURACY_NOMINAL_INDEX[0];      if(ura > SV_ACCURACY_MAX_INDEX_VALUE)         return SV_ACCURACY_NOMINAL_INDEX[SV_ACCURACY_MAX_INDEX_VALUE];      return SV_ACCURACY_NOMINAL_INDEX[ura];   }      //@}   } // namespace#endif