//
//?cEci.cpp
//
//?Copyright?（c）?2002-2003?Michael?F.?Henry
//
#include?“stdafx.h“

#include?“cEci.h“
#include?“globals.h“

//////////////////////////////////////////////////////////////////////
//?cEci?Class
//////////////////////////////////////////////////////////////////////
cEci::cEci（const?cVector?&pos?
???????????const?cVector?&vel?
???????????const?cJulian?&date
???????????bool??IsAeUnits?/*?=?true?*/）
{
???m_pos??????=?pos;
???m_vel??????=?vel;
???m_date?????=?date;
???m_VecUnits?=?（IsAeUnits???UNITS_AE?:?UNITS_NONE）;
}

//////////////////////////////////////////////////////////////////////
//?cEci（cCoordGeo&?cJulian&）
//?Calculate?the?ECI?coordinates?of?the?location?“geo“?at?time?“date“.
//?Assumes?geo?coordinates?are?km-based.
//?Assumes?the?earth?is?an?oblate?spheroid?as?defined?in?WGS?‘72.
//?Reference:?The?1992?Astronomical?Almanac?page?K11
//?Reference:?www.celestrak.com?（Dr.?TS?Kelso）
cEci::cEci（const?cCoordGeo?&geo?const?cJulian?&date）
{
???m_VecUnits?=?UNITS_KM;

???double?mfactor?=?TWOPI?*?（OMEGA_E?/?SEC_PER_DAY）;
???double?lat?=?geo.m_Lat;
???double?lon?=?geo.m_Lon;
???double?alt?=?geo.m_Alt;

???//?Calculate?Local?Mean?Sidereal?Time?（theta）
???double?theta?=?date.toLMST（lon）;
???double?c?=?1.0?/?sqrt（1.0?+?F?*?（F?-?2.0）?*?sqr（sin（lat）））;
???double?s?=?sqr（1.0?-?F）?*?c;
???double?achcp?=?（XKMPER_WGS72?*?c?+?alt）?*?cos（lat）;

???m_date?=?date;

???m_pos.m_x?=?achcp?*?cos（theta）;???????????????//?km
???m_pos.m_y?=?achcp?*?sin（theta）;???????????????//?km
???m_pos.m_z?=?（XKMPER_WGS72?*?s?+?alt）?*?sin（lat）;???//?km
???m_pos.m_w?=?sqrt（sqr（m_pos.m_x）?+?
????????????????????sqr（m_pos.m_y）?+?
????????????????????sqr（m_pos.m_z））;????????????//?range?km

???m_vel.m_x?=?-mfactor?*?m_pos.m_y;????????????//?km?/?sec
???m_vel.m_y?=??mfactor?*?m_pos.m_x;
???m_vel.m_z?=?0.0;
???m_vel.m_w?=?sqrt（sqr（m_vel.m_x）?+????????????//?range?rate?km/sec^2
????????????????????sqr（m_vel.m_y））;
}

//////////////////////////////////////////////////////////////////////////////
//?toGeo（）
//?Return?the?corresponding?geodetic?position?（based?on?the?current?ECI
//?coordinates/Julian?date）.
//?Assumes?the?earth?is?an?oblate?spheroid?as?defined?in?WGS?‘72.
//?Side?effects:?Converts?the?position?and?velocity?vectors?to?km-based?units.
//?Reference:?The?1992?Astronomical?Almanac?page?K12.?
//?Reference:?www.celestrak.com?（Dr.?TS?Kelso）
cCoordGeo?cEci::toGeo（）
{
???ae2km（）;?//?Vectors?must?be?in?kilometer-based?units

???double?theta?=?AcTan（m_pos.m_y?m_pos.m_x）;
???double?lon???=?fmod（theta?-?m_date.toGMST（）?TWOPI）;
???
???if?（lon???????lon?+=?TWOPI;??//?“wrap“?negative?modulo

???double?r???=?sqrt（sqr（m_pos.m_x）?+?sqr（m_pos.m_y））;
???double?e2??=?F?*?（2.0?-?F）;
???double?lat?=?AcTan（m_pos.m_z?r）;

???const?double?delta?=?1.0e-07;
???double?phi;
???double?c;

???do???
???{
??????phi?=?lat;
??????c???=?1.0?/?sqrt（1.0?-?e2?*?sqr（sin（phi）））;
??????lat?=?AcT

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????3642??2007-08-07?19:49??norad\cEci.cpp

?????文件???????1344??2007-08-07?19:49??norad\cEci.h

?????文件???????7380??2009-01-14?22:47??norad\cJulian.cpp

?????文件???????2467??2007-08-07?19:49??norad\cJulian.h

?????文件???????8951??2009-01-02?13:30??norad\cNoradbase.cpp

?????文件???????1655??2007-08-07?19:49??norad\cNoradbase.h

?????文件??????24813??2007-08-09?21:33??norad\cNoradSDP4.cpp

?????文件???????3238??2007-08-07?19:49??norad\cNoradSDP4.h

?????文件???????4031??2007-08-09?21:33??norad\cNoradSGP4.cpp

?????文件????????690??2007-08-07?19:49??norad\cNoradSGP4.h

?????文件????????672??2007-08-07?19:49??norad\coord.cpp

?????文件???????1131??2007-08-07?19:49??norad\coord.h

?????文件???????4703??2009-01-02?22:27??norad\cOrbit.cpp

?????文件???????3292??2009-01-02?13:30??norad\cOrbit.h

?????文件???????4806??2007-08-07?19:49??norad\cSite.cpp

?????文件???????1059??2007-08-07?19:49??norad\cSite.h

?????文件??????12359??2007-08-07?19:49??norad\cTLE.cpp

?????文件???????5241??2007-08-07?19:49??norad\cTLE.h

?????文件???????1767??2007-08-07?19:49??norad\cVector.cpp

?????文件????????761??2007-08-07?19:49??norad\cVector.h

?????文件???????1391??2007-08-07?19:49??norad\globals.cpp

?????文件???????2165??2007-08-07?19:49??norad\globals.h

?????文件????1788928??2012-12-21?15:07??norad\norad.ncb

?????文件????????870??2012-12-21?14:57??norad\norad.sln

????..A..H.??????7680??2012-12-21?15:07??norad\norad.suo

?????文件???????5444??2012-12-21?14:57??norad\norad.vcproj

?????文件???????1403??2012-12-21?15:07??norad\norad.vcproj.LBDZ-11281449.Administrator.user

?????文件???????2171??2009-01-03?09:29??norad\readme.txt

?????文件?????642384??2009-01-25?17:46??norad\Release\norad.lib

????..AD...?????????0??2009-01-25?17:46??norad\Release

............此處省略32個文件信息