//
//?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??2005-10-16?19:29??SxP4Test\cEci.cpp

?????文件???????1344??2005-09-29?21:56??SxP4Test\cEci.h

?????文件???????7381??2005-10-06?21:32??SxP4Test\cJulian.cpp

?????文件???????2467??2005-10-06?21:33??SxP4Test\cJulian.h

?????文件???????9469??2005-10-06?21:14??SxP4Test\cNoradbase.cpp

?????文件???????1647??2005-09-29?21:56??SxP4Test\cNoradbase.h

?????文件??????24817??2005-10-06?21:17??SxP4Test\cNoradSDP4.cpp

?????文件???????3238??2005-09-29?21:56??SxP4Test\cNoradSDP4.h

?????文件???????4035??2005-10-06?21:18??SxP4Test\cNoradSGP4.cpp

?????文件????????690??2005-09-29?21:56??SxP4Test\cNoradSGP4.h

?????文件????????672??2005-09-29?21:56??SxP4Test\coord.cpp

?????文件???????1131??2005-09-29?21:56??SxP4Test\coord.h

?????文件???????4506??2005-10-06?22:23??SxP4Test\cOrbit.cpp

?????文件???????3207??2005-10-15?14:30??SxP4Test\cOrbit.h

?????文件???????7344??2008-10-29?14:21??SxP4Test\cSite.cpp

?????文件???????1102??2008-10-29?14:19??SxP4Test\cSite.h

?????文件??????12359??2005-09-29?21:56??SxP4Test\cTLE.cpp

?????文件???????5241??2005-09-29?21:56??SxP4Test\cTLE.h

?????文件???????1767??2005-09-29?21:56??SxP4Test\cVector.cpp

?????文件????????761??2005-09-29?21:56??SxP4Test\cVector.h

?????文件??????37589??2008-10-29?11:45??SxP4Test\Debug\cEci.obj

?????文件??????????0??2008-10-29?11:45??SxP4Test\Debug\cEci.sbr

?????文件??????34372??2008-10-29?11:45??SxP4Test\Debug\cJulian.obj

?????文件??????????0??2008-10-29?11:45??SxP4Test\Debug\cJulian.sbr

?????文件?????129882??2008-10-29?11:45??SxP4Test\Debug\cNoradbase.obj

?????文件??????????0??2008-10-29?11:45??SxP4Test\Debug\cNoradbase.sbr

?????文件??????81225??2008-10-29?11:45??SxP4Test\Debug\cNoradSDP4.obj

?????文件??????????0??2008-10-29?11:45??SxP4Test\Debug\cNoradSDP4.sbr

?????文件??????32367??2008-10-29?11:45??SxP4Test\Debug\cNoradSGP4.obj

?????文件??????????0??2008-10-29?11:45??SxP4Test\Debug\cNoradSGP4.sbr

............此處省略42個文件信息