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Added local copy of variables to FinalPosition

feature/19
Daniel Warner 2011-03-25 15:51:11 +00:00
parent 6d6bda0eaa
commit 0e03902f69
2 changed files with 76 additions and 65 deletions
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137
SGDP4.cpp
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@ -54,13 +54,13 @@ void SGDP4::Initialize(const Tle& tle) {
/*
* extract and format tle data
*/
tle_data_.bstar = tle.GetField(Tle::FLD_BSTAR);
tle_data_.eo = tle.GetField(Tle::FLD_E);
tle_data_.omega = tle.GetField(Tle::FLD_ARGPER, Tle::U_RAD);
tle_data_.xincl = tle.GetField(Tle::FLD_I, Tle::U_RAD);
tle_data_.xmo = tle.GetField(Tle::FLD_M, Tle::U_RAD);
tle_data_.xno = tle.GetField(Tle::FLD_MMOTION) / (1440.0 / Globals::TWOPI());
tle_data_.xnodeo = tle.GetField(Tle::FLD_RAAN, Tle::U_RAD);
tle_data_0_.bstar = tle.GetField(Tle::FLD_BSTAR);
tle_data_0_.eo = tle.GetField(Tle::FLD_E);
tle_data_0_.omega = tle.GetField(Tle::FLD_ARGPER, Tle::U_RAD);
tle_data_0_.xincl = tle.GetField(Tle::FLD_I, Tle::U_RAD);
tle_data_0_.xmo = tle.GetField(Tle::FLD_M, Tle::U_RAD);
tle_data_0_.xno = tle.GetField(Tle::FLD_MMOTION) / (1440.0 / Globals::TWOPI());
tle_data_0_.xnodeo = tle.GetField(Tle::FLD_RAAN, Tle::U_RAD);
/*
* generate julian date for tle epoch
@ -72,18 +72,18 @@ void SGDP4::Initialize(const Tle& tle) {
year += 1900;
double day = tle.GetField(Tle::FLD_EPOCHDAY);
Julian jul(year, day);
tle_data_.epoch = jul;
tle_data_0_.epoch = jul;
/*
* recover original mean motion (xnodp) and semimajor axis (aodp)
* from input elements
*/
double a1 = pow(Globals::XKE() / tle_data_.xno, Globals::TOTHRD());
cosio_ = cos(tle_data_.xincl);
sinio_ = sin(tle_data_.xincl);
double a1 = pow(Globals::XKE() / tle_data_0_.xno, Globals::TOTHRD());
cosio_ = cos(tle_data_0_.xincl);
sinio_ = sin(tle_data_0_.xincl);
double theta2 = cosio_ * cosio_;
x3thm1_ = 3.0 * theta2 - 1.0;
double eosq = tle_data_.eo * tle_data_.eo;
double eosq = tle_data_0_.eo * tle_data_0_.eo;
double betao2 = 1.0 - eosq;
double betao = sqrt(betao2);
double del1 = 1.5 * Globals::CK2() * x3thm1_ / (a1 * a1 * betao * betao2);
@ -92,16 +92,16 @@ void SGDP4::Initialize(const Tle& tle) {
/*
* recovered mean motion
*/
xnodp_ = tle_data_.xno / (1.0 + delo);
xnodp_ = tle_data_0_.xno / (1.0 + delo);
/*
* recovered semimajor axis
*/
aodp_ = ao / (1.0 - delo);
gsto_ = tle_data_.epoch.ToGMST();
gsto_ = tle_data_0_.epoch.ToGMST();
double rp = aodp_ * (1.0 - tle_data_.eo);
double perigee = (aodp_ * (1.0 - tle_data_.eo) - Globals::AE()) * Globals::XKMPER();
double rp = aodp_ * (1.0 - tle_data_0_.eo);
double perigee = (aodp_ * (1.0 - tle_data_0_.eo) - Globals::AE()) * Globals::XKMPER();
double period = Globals::TWOPI() / xnodp_;
/*
@ -140,25 +140,25 @@ void SGDP4::Initialize(const Tle& tle) {
double pinvsq = 1.0 / (aodp_ * aodp_ * betao2 * betao2);
double tsi = 1.0 / (aodp_ - s4_);
eta_ = aodp_ * tle_data_.eo * tsi;
eta_ = aodp_ * tle_data_0_.eo * tsi;
double etasq = eta_ * eta_;
double eeta = tle_data_.eo * eta_;
double eeta = tle_data_0_.eo * eta_;
double psisq = fabs(1.0 - etasq);
double coef = qoms24_ * pow(tsi, 4.0);
coef1_ = coef / pow(psisq, 3.5);
double c2 = coef1_ * xnodp_ * (aodp_ * (1.0 + 1.5 * etasq + eeta *
(4.0 + etasq)) + 0.75 * Globals::CK2() * tsi / psisq *
x3thm1_ * (8.0 + 3.0 * etasq * (8.0 + etasq)));
c1_ = tle_data_.bstar * c2;
c1_ = tle_data_0_.bstar * c2;
a3ovk2_ = -Globals::XJ3() / Globals::CK2() * pow(Globals::AE(), 3.0);
x1mth2_ = 1.0 - theta2;
c4_ = 2.0 * xnodp_ * coef1_ * aodp_ * betao2 *
(eta_ * (2.0 + 0.5 * etasq) + tle_data_.eo * (0.5 + 2.0 * etasq) -
(eta_ * (2.0 + 0.5 * etasq) + tle_data_0_.eo * (0.5 + 2.0 * etasq) -
2.0 * Globals::CK2() * tsi / (aodp_ * psisq) *
(-3.0 * x3thm1_ * (1.0 - 2.0 * eeta + etasq *
(1.5 - 0.5 * eeta)) + 0.75 * x1mth2_ * (2.0 * etasq - eeta *
(1.0 + etasq)) * cos(2.0 * tle_data_.omega)));
(1.0 + etasq)) * cos(2.0 * tle_data_0_.omega)));
double theta4 = theta2 * theta2;
double temp1 = 3.0 * Globals::CK2() * pinvsq * xnodp_;
double temp2 = temp1 * Globals::CK2() * pinvsq;
@ -186,20 +186,20 @@ void SGDP4::Initialize(const Tle& tle) {
// check result (different to telsko)
double c3 = 0.0;
if (tle_data_.eo > 1.0e-4) {
if (tle_data_0_.eo > 1.0e-4) {
c3 = coef * tsi * a3ovk2_ * xnodp_ * Globals::AE() *
sinio_ / tle_data_.eo;
sinio_ / tle_data_0_.eo;
}
c5_ = 2.0 * coef1_ * aodp_ * betao2 * (1.0 + 2.75 * (etasq + eeta) + eeta * etasq);
omgcof_ = tle_data_.bstar * c3 * cos(tle_data_.omega);
omgcof_ = tle_data_0_.bstar * c3 * cos(tle_data_0_.omega);
xmcof_ = 0.0;
if (tle_data_.eo > 1.0e-4)
xmcof_ = -Globals::TOTHRD() * coef * tle_data_.bstar * Globals::AE() / eeta;
if (tle_data_0_.eo > 1.0e-4)
xmcof_ = -Globals::TOTHRD() * coef * tle_data_0_.bstar * Globals::AE() / eeta;
delmo_ = pow(1.0 + eta_ * (cos(tle_data_.xmo)), 3.0);
sinmo_ = sin(tle_data_.xmo);
delmo_ = pow(1.0 + eta_ * (cos(tle_data_0_.xmo)), 3.0);
sinmo_ = sin(tle_data_0_.xmo);
}
if (!use_simple_model_) {
@ -222,41 +222,54 @@ void SGDP4::Initialize(const Tle& tle) {
void SGDP4::FindPosition(double tsince) {
double xmo = 1;
double xnodeo = 1;
double bstar = 1;
double omegao = 1;
double xinc = 1;
struct TleData tle_data_tsince_;
memset(&tle_data_tsince_, 0, sizeof (tle_data_tsince_));
tle_data_tsince_.bstar = tle_data_0_.bstar;
tle_data_tsince_.eo = tle_data_0_.eo;
tle_data_tsince_.omega = tle_data_0_.omega;
tle_data_tsince_.xincl = tle_data_0_.xincl;
tle_data_tsince_.xmo = tle_data_0_.xmo;
tle_data_tsince_.xno = tle_data_0_.xno;
tle_data_tsince_.xnodeo = tle_data_0_.xnodeo;
tle_data_tsince_.epoch = tle_data_0_.epoch;
double xl = 0.0;
/*
* update for secular gravity and atmospheric drag
*/
double xmdf = xmo + xmdot_ * tsince;
double omgadf = omegao + omgdot_ * tsince;
double xnoddf = xnodeo + xnodot_ * tsince;
double xmdf = tle_data_0_.xmo + xmdot_ * tsince;
double omgadf = tle_data_0_.omega + omgdot_ * tsince;
double xnoddf = tle_data_tsince_.xnodeo + xnodot_ * tsince;
double tsq = tsince * tsince;
double xnode = xnoddf + xnodcf_ * tsq;
double tempa = 1.0 - c1_ * tsince;
double tempe = bstar * c4_ * tsince;
double tempe = tle_data_tsince_.bstar * c4_ * tsince;
double templ = t2cof_ * tsq;
tle_data_tsince_.omega = omgadf;
if (use_deep_space_) {
double xn = xnodp_;
double em = 0.0;
#if 0
xn = xnodp_;
CALL DPSEC(XMDF, OMGADF, XNODE, EM, XINC, XN, TSINCE);
a = (Globals::XKE() / xn)**TOTHRD * pow(tempa, 2.0);
e = em - tempe;
xmam = xmdf_ + xnodp_ * templ;
CALL DPPER(E, XINC, OMGADF, XNODE, XMAM);
xl = xmam + omgadf + xnode;
CALL DPSEC(xmdf, tle_data_tsince_.omega, XNODE, EM, tle_data_tsince_.xincl, xn, tsince);
#endif
a = pow(Globals::XKE() / xn, Globals::TOTHRD()) * pow(tempa, 2.0);
e = em - tempe;
double xmam = xmdf + xnodp_ * templ;
#if 0
CALL DPPER(E, tle_data_tsince_.xincl, tle_data_tsince_.omega, tle_data_tsince_.xnodeo, xmam);
#endif
xl = xmam + tle_data_tsince_.omega + xnode;
/*
* re-compute the perturbed values
*/
sinio_ = sin(xinc);
cosio_ = cos(xinc);
sinio_ = sin(tle_data_tsince_.xincl);
cosio_ = cos(tle_data_tsince_.xincl);
double theta2 = cosio_ * cosio_;
@ -272,23 +285,22 @@ void SGDP4::FindPosition(double tsince) {
aycof_ = 0.25 * a3ovk2_ * sinio_;
} else {
double omega = omgadf;
double xmp = xmdf;
if (use_simple_model_) {
double delomg = omgcof_ * tsince;
double delm = xmcof_ * (pow(1.0 + eta_ * cos(xmdf), 3.0) - delmo_);
double temp = delomg + delm;
double xmp = xmdf + temp;
double omega = omgadf - temp;
xmp = xmdf + temp;
tle_data_tsince_.omega -= temp;
double tcube = tsq * tsince;
double tfour = tsince * tcube;
double tempa = tempa - d2_ * tsq - d3_ * tcube - d4_ * tfour;
double tempe = tempe + bstar * c5_ * (sin(xmp) - sinmo_);
double templ = templ + t3cof_ * tcube + tfour * (t4cof_ + tsince * t5cof_);
tempa -= d2_ * tsq - d3_ * tcube - d4_ * tfour;
tempe += tle_data_tsince_.bstar * c5_ * (sin(xmp) - sinmo_);
templ += t3cof_ * tcube + tfour * (t4cof_ + tsince * t5cof_);
}
a = aodp_ * pow(tempa, 2.0);
e = eo - tempe;
xl = xmp + omega + xnode + xnodp_ * templ;
xl = xmp + tle_data_tsince_.omega + xnode + xnodp_ * templ;
}
double beta = sqrt(1.0 - e * e);
@ -296,14 +308,12 @@ void SGDP4::FindPosition(double tsince) {
/*
* long period periodics
*/
// OMEGA sgp4, OMGADF sdp4
double axn = e * cos(omgadf);
double axn = e * cos(tle_data_tsince_.omega);
double temp = 1.0 / (a * beta * beta);
double xll = temp * xlcof_ * axn;
double aynl = temp * aycof_;
double xlt = xl + xll;
// OMEGA sgp4, OMGADF sdp4
double ayn = e * sin(omgadf) + aynl;
double ayn = e * sin(tle_data_tsince_.omega) + aynl;
/*
* solve keplers equation
*/
@ -344,7 +354,7 @@ void SGDP4::FindPosition(double tsince) {
* short period preliminary quantities
*/
double elsq = axn * axn + ayn * ayn;
double temp = 1.0 - elsq;
temp = 1.0 - elsq;
double pl = a * temp;
double r = a * (1.0 - ecose);
double temp1 = 1.0 / r;
@ -358,17 +368,18 @@ void SGDP4::FindPosition(double tsince) {
double u = atan2(sinu, cosu);
double sin2u = 2.0 * sinu * cosu;
double cos2u = 2.0 * cosu * cosu - 1.0;
double temp = 1.0 / pl;
double temp1 = Globals::CK2() * temp;
double temp2 = temp1 * temp;
temp = 1.0 / pl;
temp1 = Globals::CK2() * temp;
temp2 = temp1 * temp;
/*
* update for short periodics
*/
double rk = r * (1.0 - 1.5 * temp2 * betal * x3thm1_) + 0.5 * temp1 * x1mth2_ * cos2u;
double uk = u - 0.25 * temp2 * x7thm1_ * sin2u;
double xnodek = xnode + 1.5 * temp2 * cosio_ * sin2u;
// sgp4 XINCL, sdp4 XINC
double xinck = xinc + 1.5 * temp2 * cosio_ * sinio_ * cos2u;
double xinck = tle_data_tsince_.xincl + 1.5 * temp2 * cosio_ * sinio_ * cos2u;
double rdotk = rdot - xn * temp1 * x1mth2_ * sin2u;
double rfdotk = rfdot + xn * temp1 * (x1mth2_ * cos2u + 1.5 * x3thm1_);
/*

4
SGDP4.h
View File

@ -10,7 +10,7 @@ public:
void Initialize(const Tle& tle);
void SGDP4::FindPosition(double tsince);
void FindPosition(double tsince);
struct TleData {
double bstar;
@ -26,7 +26,7 @@ public:
private:
bool first_run_;
struct TleData tle_data_;
struct TleData tle_data_0_;
double cosio_;
double sinio_;