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myRtkcmn.c
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myRtkcmn.c
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#include "gamp.h"
/* constants -----------------------------------------------------------------*/
#define MIN(x,y) ((x)<=(y)?(x):(y))
#define MAX(x,y) ((x)>=(y)?(x):(y))
#define SQRT(x) ((x)<=0.0?0.0:sqrt(x))
static double sign(double d, double d1)
{
if (d1>0) return fabs(d);
else if (d1<0) return 0-fabs(d);
else return 0;
}
//get site coordinates from sinex file
extern void getCoord_snx(char *filepath, char *sitename, double coord[4])
{
FILE *fp=NULL;
char ch[100],chtmp[5];
int inregion=-1;
if (strlen(filepath)<3) return;
coord[0]=coord[1]=coord[2]=coord[3]=0.0;
if ((fp=fopen(filepath,"r"))==NULL) {
printf("*** ERROR: sinex file %s open failed!\n",filepath);
return;
}
while (!feof(fp)) {
fgets(ch,sizeof(ch),fp);
if (strstr(ch,"+SOLUTION/ESTIMATE")) {
inregion=1;
}
if (strstr(ch,"-SOLUTION/ESTIMATE")) {
inregion=0;
break;
}
if (inregion==1) {
strncpy(chtmp,&ch[14],4); chtmp[4]='\0';
if (strcasecmp(chtmp,sitename)==0&&strstr(ch,"STAX")) {
coord[0]=str2num(ch,47,21);
}
if (strcasecmp(chtmp,sitename)==0&&strstr(ch, "STAY")) {
coord[1]=str2num(ch,47,21);
}
if (strcasecmp(chtmp,sitename)==0&&strstr(ch,"STAZ")) {
coord[2]=str2num(ch,47,21);
break;
}
}
}
if (coord[0]*coord[1]*coord[2]!=0.0) coord[3]=2.0; //来自snx文件
fclose(fp);
}
//get site coordinates from site.crd
extern int getCoord_i(char *filepath, char *sitename, double coord[])
{
FILE *fp=NULL;
char ch[1000],chtmp[5];
if (strlen(filepath)<3) return 0;
coord[0]=coord[1]=coord[2]=0.0;
if ((fp=fopen(filepath,"r"))==NULL) {
printf("*** ERROR: site.crd file NOT found!");
return 0;
}
while (!feof(fp)) {
fgets(ch,sizeof(ch),fp);
xStrMid(chtmp,0,4,ch);
if (strcasecmp(chtmp,sitename)==0) {
//coord[0]=str2num(ch, 104, 14);
//coord[1]=str2num(ch, 119, 14);
//coord[2]=str2num(ch, 134, 14);
sscanf(ch,"%s %lf %lf %lf",chtmp,coord,coord+1,coord+2);
break;
}
}
fclose(fp);
if (coord[0]*coord[1]*coord[2]==0.0) {
printf("*** WARNING: Not found the coordinates for site %s!\n",sitename);
return 0;
}
return 1;
}
//C input data
//C ----------
//C dmjd: modified julian date
//C pgt station coordinate
//C ellipsoidal latitude in radians
//C longitude in radians
//C ellipsoidal height in m
//C
//C output data
//C -----------
//C pres: pressure in hPa
//C temp: temperature in Celsius
//C undu: Geoid undulation in m (from a 9x9 EGM based model)
//////////////////////////////////////////////////////////////////////////
// Given:
// DMJD d Modified Julian Date
// DLAT d Latitude given in radians (North Latitude)
// DLON d Longitude given in radians (East Longitude)
// DHGT d Ellipsoidal height in meters
//
// Returned:
// PRES d Pressure given in hPa
// TEMP d Temperature in degrees Celsius
// UNDU d Geoid undulation in meters (Note 1)
/*+
* - - - - - - - - -
* G P T
* - - - - - - - - -
*
* This routine is part of the International Earth Rotation and
* Reference Systems Service (IERS) Conventions software collection.
*
* This subroutine determines Global Pressure and Temperature (Boehm et al. 2007)
* based on Spherical Harmonics up to degree and order 9.
*
* In general, Class 1, 2, and 3 models represent physical effects that
* act on geodetic parameters while canonical models provide lower-level
* representations or basic computations that are used by Class 1, 2, or
* 3 models.
*
* Status: Class 1 model
*
* Class 1 models are those recommended to be used a priori in the
* reduction of raw space geodetic data in order to determine
* geodetic parameter estimates.
* Class 2 models are those that eliminate an observational
* singularity and are purely conventional in nature.
* Class 3 models are those that are not required as either Class
* 1 or 2.
* Canonical models are accepted as is and cannot be classified as a
* Class 1, 2, or 3 model.
*
* Given:
* DMJD d Modified Julian Date
* DLAT d Latitude given in radians (North Latitude)
* DLON d Longitude given in radians (East Longitude)
* DHGT d Ellipsoidal height in meters
*
* Returned:
* PRES d Pressure given in hPa
* TEMP d Temperature in degrees Celsius
* UNDU d Geoid undulation in meters (Note 1)
*
* Notes:
*
* 1) This is from a 9x9 Earth Gravitational Model (EGM).
*
* Test case:
* given input: DMJD = 55055D0
* DLAT = 0.6708665767D0 radians (NRAO, Green Bank, WV)
* DLON = -1.393397187D0 radians
* DHGT = 812.546 meters
* expected output: PRES = 918.0710638757363995D0 hPa
* TEMP = 19.31914181012882992D0 degrees Celsius
* UNDU = -42.19185643717770517D0 meters
*
* References:
*
* Boehm, J., Heinkelmann, R. and Schuh, H., 2007, "Short Note: A
* Global model of pressure and temperature for geodetic applications",
* Journal of Geodesy, 81(10), pp. 679-683.
*
* Petit, G. and Luzum, B. (eds.), IERS Conventions (2010),
* IERS Technical Note No. 36, BKG (2010)
*
* Revisions:
* 2006 June 12 J. Boehm Original code
* 2006 June 16 J. Boehm Accounted for geoid undulation
* 2006 August 14 O. Montenbruck Recursions for Legendre polynomials
* 2009 February 13 B.E. Stetzler Added header and copyright
* 2009 March 30 B.E. Stetzler More modifications and defined twopi
* 2009 March 31 B.E. Stetzler Provided test case
* 2009 July 29 B.E. Stetzler Capitalized all variables for FORTRAN 77
* compatibility and corrected test case
* latitude and longitude coordinates
* 2011 October 18 B.E. Stetzler Corrected test case output mentioned
* in the header
*-----------------------------------------------------------------------
*/
//ftp://tai.bipm.org/iers/convupdt/chapter9/GPT.F
///*
extern void getGPT(const double *pos,double dmjd, double *pres, double *temp, double *undu)
{
double V[10][10],W[10][10];
int I,N,M,NMAX,MMAX;
double DOY,TEMP0,PRES0,APM,APA,ATM,ATA,HORT,X,Y,Z;
double DLAT,DLON,DHGT,PRES,TEMP,UNDU;
const double TWOPI=6.283185307179586476925287;
double a_geoid[55] = {
-5.6195e-001,-6.0794e-002,-2.0125e-001,-6.4180e-002,-3.6997e-002,
+1.0098e+001,+1.6436e+001,+1.4065e+001,+1.9881e+000,+6.4414e-001,
-4.7482e+000,-3.2290e+000,+5.0652e-001,+3.8279e-001,-2.6646e-002,
+1.7224e+000,-2.7970e-001,+6.8177e-001,-9.6658e-002,-1.5113e-002,
+2.9206e-003,-3.4621e+000,-3.8198e-001,+3.2306e-002,+6.9915e-003,
-2.3068e-003,-1.3548e-003,+4.7324e-006,+2.3527e+000,+1.2985e+000,
+2.1232e-001,+2.2571e-002,-3.7855e-003,+2.9449e-005,-1.6265e-004,
+1.1711e-007,+1.6732e+000,+1.9858e-001,+2.3975e-002,-9.0013e-004,
-2.2475e-003,-3.3095e-005,-1.2040e-005,+2.2010e-006,-1.0083e-006,
+8.6297e-001,+5.8231e-001,+2.0545e-002,-7.8110e-003,-1.4085e-004,
-8.8459e-006,+5.7256e-006,-1.5068e-006,+4.0095e-007,-2.4185e-008 };
double b_geoid[55]={
+0.0000e+000,+0.0000e+000,-6.5993e-002,+0.0000e+000,+6.5364e-002,
-5.8320e+000,+0.0000e+000,+1.6961e+000,-1.3557e+000,+1.2694e+000,
0.0000e+000,-2.9310e+000,+9.4805e-001,-7.6243e-002,+4.1076e-002,
+0.0000e+000,-5.1808e-001,-3.4583e-001,-4.3632e-002,+2.2101e-003,
-1.0663e-002,+0.0000e+000,+1.0927e-001,-2.9463e-001,+1.4371e-003,
-1.1452e-002,-2.8156e-003,-3.5330e-004,+0.0000e+000,+4.4049e-001,
+5.5653e-002,-2.0396e-002,-1.7312e-003,+3.5805e-005,+7.2682e-005,
+2.2535e-006,+0.0000e+000,+1.9502e-002,+2.7919e-002,-8.1812e-003,
+4.4540e-004,+8.8663e-005,+5.5596e-005,+2.4826e-006,+1.0279e-006,
+0.0000e+000,+6.0529e-002,-3.5824e-002,-5.1367e-003,+3.0119e-005,
-2.9911e-005,+1.9844e-005,-1.2349e-006,-7.6756e-009,+5.0100e-008
};
double ap_mean[55]= {
+1.0108e+003,+8.4886e+000,+1.4799e+000,-1.3897e+001,+3.7516e-003,
-1.4936e-001,+1.2232e+001,-7.6615e-001,-6.7699e-002,+8.1002e-003,
-1.5874e+001,+3.6614e-001,-6.7807e-002,-3.6309e-003,+5.9966e-004,
+4.8163e+000,-3.7363e-001,-7.2071e-002,+1.9998e-003,-6.2385e-004,
-3.7916e-004,+4.7609e+000,-3.9534e-001,+8.6667e-003,+1.1569e-002,
+1.1441e-003,-1.4193e-004,-8.5723e-005,+6.5008e-001,-5.0889e-001,
-1.5754e-002,-2.8305e-003,+5.7458e-004,+3.2577e-005,-9.6052e-006,
-2.7974e-006,+1.3530e+000,-2.7271e-001,-3.0276e-004,+3.6286e-003,
-2.0398e-004,+1.5846e-005,-7.7787e-006,+1.1210e-006,+9.9020e-008,
+5.5046e-001,-2.7312e-001,+3.2532e-003,-2.4277e-003,+1.1596e-004,
+2.6421e-007,-1.3263e-006,+2.7322e-007,+1.4058e-007,+4.9414e-009
};
double bp_mean[55]= {
+0.0000e+000,+0.0000e+000,-1.2878e+000,+0.0000e+000,+7.0444e-001,
+3.3222e-001,+0.0000e+000,-2.9636e-001,+7.2248e-003,+7.9655e-003,
+0.0000e+000,+1.0854e+000,+1.1145e-002,-3.6513e-002,+3.1527e-003,
+0.0000e+000,-4.8434e-001,+5.2023e-002,-1.3091e-002,+1.8515e-003,
+1.5422e-004,+0.0000e+000,+6.8298e-001,+2.5261e-003,-9.9703e-004,
-1.0829e-003,+1.7688e-004,-3.1418e-005,+0.0000e+000,-3.7018e-001,
+4.3234e-002,+7.2559e-003,+3.1516e-004,+2.0024e-005,-8.0581e-006,
-2.3653e-006,+0.0000e+000,+1.0298e-001,-1.5086e-002,+5.6186e-003,
+3.2613e-005,+4.0567e-005,-1.3925e-006,-3.6219e-007,-2.0176e-008,
+0.0000e+000,-1.8364e-001,+1.8508e-002,+7.5016e-004,-9.6139e-005,
-3.1995e-006,+1.3868e-007,-1.9486e-007,+3.0165e-010,-6.4376e-010
};
double ap_amp[55]= {
-1.0444e-001,+1.6618e-001,-6.3974e-002,+1.0922e+000,+5.7472e-001,
-3.0277e-001,-3.5087e+000,+7.1264e-003,-1.4030e-001,+3.7050e-002,
+4.0208e-001,-3.0431e-001,-1.3292e-001,+4.6746e-003,-1.5902e-004,
+2.8624e+000,-3.9315e-001,-6.4371e-002,+1.6444e-002,-2.3403e-003,
+4.2127e-005,+1.9945e+000,-6.0907e-001,-3.5386e-002,-1.0910e-003,
-1.2799e-004,+4.0970e-005,+2.2131e-005,-5.3292e-001,-2.9765e-001,
-3.2877e-002,+1.7691e-003,+5.9692e-005,+3.1725e-005,+2.0741e-005,
-3.7622e-007,+2.6372e+000,-3.1165e-001,+1.6439e-002,+2.1633e-004,
+1.7485e-004,+2.1587e-005,+6.1064e-006,-1.3755e-008,-7.8748e-008,
-5.9152e-001,-1.7676e-001,+8.1807e-003,+1.0445e-003,+2.3432e-004,
+9.3421e-006,+2.8104e-006,-1.5788e-007,-3.0648e-008,+2.6421e-010
};
double bp_amp[55]= {
+0.0000e+000,+0.0000e+000,+9.3340e-001,+0.0000e+000,+8.2346e-001,
+2.2082e-001,+0.0000e+000,+9.6177e-001,-1.5650e-002,+1.2708e-003,
+0.0000e+000,-3.9913e-001,+2.8020e-002,+2.8334e-002,+8.5980e-004,
+0.0000e+000,+3.0545e-001,-2.1691e-002,+6.4067e-004,-3.6528e-005,
-1.1166e-004,+0.0000e+000,-7.6974e-002,-1.8986e-002,+5.6896e-003,
-2.4159e-004,-2.3033e-004,-9.6783e-006,+0.0000e+000,-1.0218e-001,
-1.3916e-002,-4.1025e-003,-5.1340e-005,-7.0114e-005,-3.3152e-007,
+1.6901e-006,+0.0000e+000,-1.2422e-002,+2.5072e-003,+1.1205e-003,
-1.3034e-004,-2.3971e-005,-2.6622e-006,+5.7852e-007,+4.5847e-008,
+0.0000e+000,+4.4777e-002,-3.0421e-003,+2.6062e-005,-7.2421e-005,
+1.9119e-006,+3.9236e-007,+2.2390e-007,+2.9765e-009,-4.6452e-009
};
double at_mean[55]= {
+1.6257e+001,+2.1224e+000,+9.2569e-001,-2.5974e+001,+1.4510e+000,
+9.2468e-002,-5.3192e-001,+2.1094e-001,-6.9210e-002,-3.4060e-002,
-4.6569e+000,+2.6385e-001,-3.6093e-002,+1.0198e-002,-1.8783e-003,
+7.4983e-001,+1.1741e-001,+3.9940e-002,+5.1348e-003,+5.9111e-003,
+8.6133e-006,+6.3057e-001,+1.5203e-001,+3.9702e-002,+4.6334e-003,
+2.4406e-004,+1.5189e-004,+1.9581e-007,+5.4414e-001,+3.5722e-001,
+5.2763e-002,+4.1147e-003,-2.7239e-004,-5.9957e-005,+1.6394e-006,
-7.3045e-007,-2.9394e+000,+5.5579e-002,+1.8852e-002,+3.4272e-003,
-2.3193e-005,-2.9349e-005,+3.6397e-007,+2.0490e-006,-6.4719e-008,
-5.2225e-001,+2.0799e-001,+1.3477e-003,+3.1613e-004,-2.2285e-004,
-1.8137e-005,-1.5177e-007,+6.1343e-007,+7.8566e-008,+1.0749e-009
};
double bt_mean[55]= {
+0.0000e+000,+0.0000e+000,+1.0210e+000,+0.0000e+000,+6.0194e-001,
+1.2292e-001,+0.0000e+000,-4.2184e-001,+1.8230e-001,+4.2329e-002,
+0.0000e+000,+9.3312e-002,+9.5346e-002,-1.9724e-003,+5.8776e-003,
+0.0000e+000,-2.0940e-001,+3.4199e-002,-5.7672e-003,-2.1590e-003,
+5.6815e-004,+0.0000e+000,+2.2858e-001,+1.2283e-002,-9.3679e-003,
-1.4233e-003,-1.5962e-004,+4.0160e-005,+0.0000e+000,+3.6353e-002,
-9.4263e-004,-3.6762e-003,+5.8608e-005,-2.6391e-005,+3.2095e-006,
-1.1605e-006,+0.0000e+000,+1.6306e-001,+1.3293e-002,-1.1395e-003,
+5.1097e-005,+3.3977e-005,+7.6449e-006,-1.7602e-007,-7.6558e-008,
+0.0000e+000,-4.5415e-002,-1.8027e-002,+3.6561e-004,-1.1274e-004,
+1.3047e-005,+2.0001e-006,-1.5152e-007,-2.7807e-008,+7.7491e-009
};
double at_amp[55]= {
-1.8654e+000,-9.0041e+000,-1.2974e-001,-3.6053e+000,+2.0284e-002,
+2.1872e-001,-1.3015e+000,+4.0355e-001,+2.2216e-001,-4.0605e-003,
+1.9623e+000,+4.2887e-001,+2.1437e-001,-1.0061e-002,-1.1368e-003,
-6.9235e-002,+5.6758e-001,+1.1917e-001,-7.0765e-003,+3.0017e-004,
+3.0601e-004,+1.6559e+000,+2.0722e-001,+6.0013e-002,+1.7023e-004,
-9.2424e-004,+1.1269e-005,-6.9911e-006,-2.0886e+000,-6.7879e-002,
-8.5922e-004,-1.6087e-003,-4.5549e-005,+3.3178e-005,-6.1715e-006,
-1.4446e-006,-3.7210e-001,+1.5775e-001,-1.7827e-003,-4.4396e-004,
+2.2844e-004,-1.1215e-005,-2.1120e-006,-9.6421e-007,-1.4170e-008,
+7.8720e-001,-4.4238e-002,-1.5120e-003,-9.4119e-004,+4.0645e-006,
-4.9253e-006,-1.8656e-006,-4.0736e-007,-4.9594e-008,+1.6134e-009
};
double bt_amp[55]= {
+0.0000e+000,+0.0000e+000,-8.9895e-001,+0.0000e+000,-1.0790e+000,
-1.2699e-001,+0.0000e+000,-5.9033e-001,+3.4865e-002,-3.2614e-002,
+0.0000e+000,-2.4310e-002,+1.5607e-002,-2.9833e-002,-5.9048e-003,
+0.0000e+000,+2.8383e-001,+4.0509e-002,-1.8834e-002,-1.2654e-003,
-1.3794e-004,+0.0000e+000,+1.3306e-001,+3.4960e-002,-3.6799e-003,
-3.5626e-004,+1.4814e-004,+3.7932e-006,+0.0000e+000,+2.0801e-001,
+6.5640e-003,-3.4893e-003,-2.7395e-004,+7.4296e-005,-7.9927e-006,
-1.0277e-006,+0.0000e+000,+3.6515e-002,-7.4319e-003,-6.2873e-004,
-8.2461e-005,+3.1095e-005,-5.3860e-007,-1.2055e-007,-1.1517e-007,
+0.0000e+000,+3.1404e-002,+1.5580e-002,-1.1428e-003,+3.3529e-005,
+1.0387e-005,-1.9378e-006,-2.7327e-007,+7.5833e-009,-9.2323e-009
};
DLAT=pos[0];
DLON=pos[1];
DHGT=pos[2];
// Reference day is 28 January 1980
// This is taken from Niell (1996) to be consistent (See References)
// For constant values use: doy = 91.3125
DOY=dmjd-44239+1-28;
// Define degree n and order m EGM
NMAX=MMAX=9;
// Define unit vector
X=cos(DLAT)*cos(DLON);
Y=cos(DLAT)*sin(DLON);
Z=sin(DLAT);
// Legendre polynomials
V[1-1][1-1] = 1.0;
W[1-1][1-1] = 0.0;
V[2-1][1-1] = Z * V[1-1][1-1];
W[2-1][1-1] = 0.0;
for (N=2;N<=NMAX;N++) {
V[N+1-1][1-1] = ((2*N-1) * Z * V[N-1][1-1] - (N-1) * V[N-1-1][1-1]) / N ;
W[N+1-1][1-1] = 0.0;
}
for( M=1;M<=NMAX;M++) {
V[M+1-1][M+1-1] = (2*M-1) * (X*V[M-1][M-1] - Y*W[M-1][M-1]);
W[M+1-1][M+1-1] = (2*M-1) * (X*W[M-1][M-1] + Y*V[M-1][M-1]);
if (M < NMAX) {
V[M+2-1][M+1-1] = (2*M+1) * Z * V[M+1-1][M+1-1];
W[M+2-1][M+1-1] = (2*M+1) * Z * W[M+1-1][M+1-1];
}
for (N=M+2;N<=NMAX;N++) {
V[N+1-1][M+1-1] = ((2*N-1)*Z*V[N-1][M+1-1] - (N+M-1)*V[N-1-1][M+1-1]) / (N-M);
W[N+1-1][M+1-1] = ((2*N-1)*Z*W[N-1][M+1-1] - (N+M-1)*W[N-1-1][M+1-1]) / (N-M);
}
}
// Geoidal height
UNDU = 0.0;
I = 0;
for (N=0;N<=NMAX;N++) {
for (M=0;M<=N;M++) {
I = I+1;
UNDU = UNDU + (a_geoid[I-1]*V[N+1-1][M+1-1] + b_geoid[I-1]*W[N+1-1][M+1-1]);
}
}
// orthometric height
HORT = DHGT - UNDU;
// Surface pressure on the geoid
APM = 0.0;
APA = 0.0;
I = 0;
for (N=0;N<=NMAX;N++) {
for (M=0;M<=N;M++) {
I = I+1;
APM = APM + ( ap_mean[I-1]*V[N+1-1][M+1-1] + bp_mean[I-1]*W[N+1-1][M+1-1] ) ;
APA = APA + ( ap_amp[I-1] *V[N+1-1][M+1-1] + bp_amp[I-1] *W[N+1-1][M+1-1] ) ;
}
}
PRES0 = APM + APA*cos(DOY/365.25*TWOPI);
// height correction for pressure
PRES = PRES0*pow(1.0-0.0000226*HORT, 5.225);
// Surface temperature on the geoid
ATM = 0.0;
ATA = 0.0;
I = 0;
for (N=0;N<=NMAX;N++) {
for (M=0;M<=N;M++) {
I = I+1;
ATM = ATM + (at_mean[I-1]*V[N+1-1][M+1-1] + bt_mean[I-1]*W[N+1-1][M+1-1]);
ATA = ATA + (at_amp[I-1] *V[N+1-1][M+1-1] + bt_amp[I-1] *W[N+1-1][M+1-1]);
}
}
TEMP0 = ATM + ATA*cos(DOY/365.25*TWOPI);
// height correction for temperature
TEMP = TEMP0 - 0.0065*HORT;
*pres=PRES;
*temp=TEMP;
*undu=UNDU;
// Finished.
}
//ftp://tai.bipm.org/iers/convupdt/chapter9/GMF.F
/* GMF */
// This subroutine determines the Global Mapping Functions GMF
// Reference: Boehm, J., A.E. Niell, P. Tregoning, H. Schuh (2006),
// Global Mapping Functions (GMF): A new empirical mapping function based on numerical weather model data,
// Geoph. Res. Letters, Vol. 33, L07304, doi:10.1029/2005GL025545.
// input data
// ----------
// dmjd: modified julian date
// dlat: latitude in radians
// dlon: longitude in radians
// dhgt: height in m
// zd: zenith distance in radians
// output data
// -----------
// gmfh: hydrostatic mapping function
// gmfw: wet mapping function
// Johannes Boehm, 2005 August 30
extern void tropmapf_gmf(gtime_t gt, const double blh[3], double elev, double *gmfh, double *gmfw)
{
double dfac[20],P[10][10],aP[55],bP[55],t,dmjd;
int i,j,ir,k,n,m,nmax,mmax;
double doy,phh;
double ah,bh,ch,aw,bw,cw;
double ahm,aha,awm,awa;
double c10h,c11h,c0h;
double a_ht,b_ht,c_ht;
double sine,beta,gamma,topcon;
double hs_km,ht_corr,ht_corr_coef;
double dlat,dlon,dhgt,sum,dt;
//double PI = 3.1415926535897932384626433;
double TWOPI = 6.283185307179586476925287;
static double ah_mean[55] = {
+1.2517e+02, +8.503e-01, +6.936e-02, -6.760e+00, +1.771e-01,
+1.130e-02, +5.963e-01, +1.808e-02, +2.801e-03, -1.414e-03,
-1.212e+00, +9.300e-02, +3.683e-03, +1.095e-03, +4.671e-05,
+3.959e-01, -3.867e-02, +5.413e-03, -5.289e-04, +3.229e-04,
+2.067e-05, +3.000e-01, +2.031e-02, +5.900e-03, +4.573e-04,
-7.619e-05, +2.327e-06, +3.845e-06, +1.182e-01, +1.158e-02,
+5.445e-03, +6.219e-05, +4.204e-06, -2.093e-06, +1.540e-07,
-4.280e-08, -4.751e-01, -3.490e-02, +1.758e-03, +4.019e-04,
-2.799e-06, -1.287e-06, +5.468e-07, +7.580e-08, -6.300e-09,
-1.160e-01, +8.301e-03, +8.771e-04, +9.955e-05, -1.718e-06,
-2.012e-06, +1.170e-08, +1.790e-08, -1.300e-09, +1.000e-10
};
static double bh_mean[55] = {
+0.000e+00, +0.000e+00, +3.249e-02, +0.000e+00, +3.324e-02,
+1.850e-02, +0.000e+00, -1.115e-01, +2.519e-02, +4.923e-03,
+0.000e+00, +2.737e-02, +1.595e-02, -7.332e-04, +1.933e-04,
+0.000e+00, -4.796e-02, +6.381e-03, -1.599e-04, -3.685e-04,
+1.815e-05, +0.000e+00, +7.033e-02, +2.426e-03, -1.111e-03,
-1.357e-04, -7.828e-06, +2.547e-06, +0.000e+00, +5.779e-03,
+3.133e-03, -5.312e-04, -2.028e-05, +2.323e-07, -9.100e-08,
-1.650e-08, +0.000e+00, +3.688e-02, -8.638e-04, -8.514e-05,
-2.828e-05, +5.403e-07, +4.390e-07, +1.350e-08, +1.800e-09,
+0.000e+00, -2.736e-02, -2.977e-04, +8.113e-05, +2.329e-07,
+8.451e-07, +4.490e-08, -8.100e-09, -1.500e-09, +2.000e-10
};
static double ah_amp[55] = {
-2.738e-01, -2.837e+00, +1.298e-02, -3.588e-01, +2.413e-02,
+3.427e-02, -7.624e-01, +7.272e-02, +2.160e-02, -3.385e-03,
+4.424e-01, +3.722e-02, +2.195e-02, -1.503e-03, +2.426e-04,
+3.013e-01, +5.762e-02, +1.019e-02, -4.476e-04, +6.790e-05,
+3.227e-05, +3.123e-01, -3.535e-02, +4.840e-03, +3.025e-06,
-4.363e-05, +2.854e-07, -1.286e-06, -6.725e-01, -3.730e-02,
+8.964e-04, +1.399e-04, -3.990e-06, +7.431e-06, -2.796e-07,
-1.601e-07, +4.068e-02, -1.352e-02, +7.282e-04, +9.594e-05,
+2.070e-06, -9.620e-08, -2.742e-07, -6.370e-08, -6.300e-09,
+8.625e-02, -5.971e-03, +4.705e-04, +2.335e-05, +4.226e-06,
+2.475e-07, -8.850e-08, -3.600e-08, -2.900e-09, +0.000e+00
};
static double bh_amp[55] = {
+0.000e+00, +0.000e+00, -1.136e-01, +0.000e+00, -1.868e-01,
-1.399e-02, +0.000e+00, -1.043e-01, +1.175e-02, -2.240e-03,
+0.000e+00, -3.222e-02, +1.333e-02, -2.647e-03, -2.316e-05,
+0.000e+00, +5.339e-02, +1.107e-02, -3.116e-03, -1.079e-04,
-1.299e-05, +0.000e+00, +4.861e-03, +8.891e-03, -6.448e-04,
-1.279e-05, +6.358e-06, -1.417e-07, +0.000e+00, +3.041e-02,
+1.150e-03, -8.743e-04, -2.781e-05, +6.367e-07, -1.140e-08,
-4.200e-08, +0.000e+00, -2.982e-02, -3.000e-03, +1.394e-05,
-3.290e-05, -1.705e-07, +7.440e-08, +2.720e-08, -6.600e-09,
+0.000e+00, +1.236e-02, -9.981e-04, -3.792e-05, -1.355e-05,
+1.162e-06, -1.789e-07, +1.470e-08, -2.400e-09, -4.000e-10
};
static double aw_mean[55] = {
+5.640e+01, +1.555e+00, -1.011e+00, -3.975e+00, +3.171e-02,
+1.065e-01, +6.175e-01, +1.376e-01, +4.229e-02, +3.028e-03,
+1.688e+00, -1.692e-01, +5.478e-02, +2.473e-02, +6.059e-04,
+2.278e+00, +6.614e-03, -3.505e-04, -6.697e-03, +8.402e-04,
+7.033e-04, -3.236e+00, +2.184e-01, -4.611e-02, -1.613e-02,
-1.604e-03, +5.420e-05, +7.922e-05, -2.711e-01, -4.406e-01,
-3.376e-02, -2.801e-03, -4.090e-04, -2.056e-05, +6.894e-06,
+2.317e-06, +1.941e+00, -2.562e-01, +1.598e-02, +5.449e-03,
+3.544e-04, +1.148e-05, +7.503e-06, -5.667e-07, -3.660e-08,
+8.683e-01, -5.931e-02, -1.864e-03, -1.277e-04, +2.029e-04,
+1.269e-05, +1.629e-06, +9.660e-08, -1.015e-07, -5.000e-10
};
static double bw_mean[55] = {
+0.000e+00, +0.000e+00, +2.592e-01, +0.000e+00, +2.974e-02,
-5.471e-01, +0.000e+00, -5.926e-01, -1.030e-01, -1.567e-02,
+0.000e+00, +1.710e-01, +9.025e-02, +2.689e-02, +2.243e-03,
+0.000e+00, +3.439e-01, +2.402e-02, +5.410e-03, +1.601e-03,
+9.669e-05, +0.000e+00, +9.502e-02, -3.063e-02, -1.055e-03,
-1.067e-04, -1.130e-04, +2.124e-05, +0.000e+00, -3.129e-01,
+8.463e-03, +2.253e-04, +7.413e-05, -9.376e-05, -1.606e-06,
+2.060e-06, +0.000e+00, +2.739e-01, +1.167e-03, -2.246e-05,
-1.287e-04, -2.438e-05, -7.561e-07, +1.158e-06, +4.950e-08,
+0.000e+00, -1.344e-01, +5.342e-03, +3.775e-04, -6.756e-05,
-1.686e-06, -1.184e-06, +2.768e-07, +2.730e-08, +5.700e-09
};
static double aw_amp[55] = {
+1.023e-01, -2.695e+00, +3.417e-01, -1.405e-01, +3.175e-01,
+2.116e-01, +3.536e+00, -1.505e-01, -1.660e-02, +2.967e-02,
+3.819e-01, -1.695e-01, -7.444e-02, +7.409e-03, -6.262e-03,
-1.836e+00, -1.759e-02, -6.256e-02, -2.371e-03, +7.947e-04,
+1.501e-04, -8.603e-01, -1.360e-01, -3.629e-02, -3.706e-03,
-2.976e-04, +1.857e-05, +3.021e-05, +2.248e+00, -1.178e-01,
+1.255e-02, +1.134e-03, -2.161e-04, -5.817e-06, +8.836e-07,
-1.769e-07, +7.313e-01, -1.188e-01, +1.145e-02, +1.011e-03,
+1.083e-04, +2.570e-06, -2.140e-06, -5.710e-08, +2.000e-08,
-1.632e+00, -6.948e-03, -3.893e-03, +8.592e-04, +7.577e-05,
+4.539e-06, -3.852e-07, -2.213e-07, -1.370e-08, +5.800e-09
};
static double bw_amp[55] = {
+0.000e+00, +0.000e+00, -8.865e-02, +0.000e+00, -4.309e-01,
+6.340e-02, +0.000e+00, +1.162e-01, +6.176e-02, -4.234e-03,
+0.000e+00, +2.530e-01, +4.017e-02, -6.204e-03, +4.977e-03,
+0.000e+00, -1.737e-01, -5.638e-03, +1.488e-04, +4.857e-04,
-1.809e-04, +0.000e+00, -1.514e-01, -1.685e-02, +5.333e-03,
-7.611e-05, +2.394e-05, +8.195e-06, +0.000e+00, +9.326e-02,
-1.275e-02, -3.071e-04, +5.374e-05, -3.391e-05, -7.436e-06,
+6.747e-07, +0.000e+00, -8.637e-02, -3.807e-03, -6.833e-04,
-3.861e-05, -2.268e-05, +1.454e-06, +3.860e-07, -1.068e-07,
+0.000e+00, -2.658e-02, -1.947e-03, +7.131e-04, -3.506e-05,
+1.885e-07, +5.792e-07, +3.990e-08, +2.000e-08, -5.700e-09
};
mjd_t mjd;
time2mjd(gt,&mjd);
dmjd=mjd.day+(mjd.ds.sn+mjd.ds.tos)/86400.0;
//reference day is 28 January
//this is taken from Niell(1996) to be consistent
//doy=dmjd-44239.0+1-28;
doy=dmjd-44239.0-27;
dlat=blh[0]; dlon=blh[1]; dhgt=blh[2];
//parameter t
t=sin(dlat);
//degree n and order m
nmax=9;
mmax=9;
//determine nmax!(faktorielle) moved by 1
dfac[0]=1;
for (i=1;i<=2*nmax+1;i++)
dfac[i]=dfac[i-1]*i;
//determine Legendre functions (Heiskanen and Moritz, Physical Geodesy, 1967, eq. 1-62)
for (i=0;i<=nmax;i++) {
for (j=0;j<=MIN(i,mmax);j++) {
ir=(int)((i-j)/2);
sum=0.0;
for (k=0;k<=ir;k++) {
sum=sum+pow(-1.0,k)*dfac[2*i-2*k]/dfac[k]/dfac[i-k]/dfac[i-j-2*k]*pow(t,i-j-2*k);
}
//Legender functions moved by 1
P[i][j]=1.0/pow(2.0,i)*sqrt(pow(1-t*t,j))*sum;
}
}
//spherical harmonics
i=0;
for (n=0;n<=9;n++) {
for (m=0;m<=n;m++) {
i=i+1;
dt=m*dlon;
aP[i-1]=P[n][m]*cos(dt);
bP[i-1]=P[n][m]*sin(dt);
}
}
//hydrostatic
bh=0.0029;
c0h=0.062;
if (dlat<0.0) { //southern hemisphere
phh=PI;
c11h=0.007;
c10h=0.002;
}
else { //northern hemisphere
phh=0;
c11h=0.005;
c10h=0.001;
}
ch=c0h+((cos(doy/365.25*TWOPI+phh)+1.0)*c11h/2.0+c10h)*(1.0-cos(dlat));
ahm=0.0;
aha=0.0;
for (i=1;i<=55;i++) {
ahm=ahm+(ah_mean[i-1]*aP[i-1]+bh_mean[i-1]*bP[i-1])*1.0e-5;
aha=aha+(ah_amp[i-1] *aP[i-1]+bh_amp[i-1] *bP[i-1])*1.0e-5;
}
ah=ahm+aha*cos(doy/365.25*TWOPI);
sine=sin(elev);
beta=bh/(sine+ch);
gamma=ah/(sine+beta);
topcon=(1.0+ah/(1.0+bh/(1.0+ch)));
*gmfh=topcon/(sine+gamma);
//height correction for hydrostatic mapping function from Niell (1996)
a_ht=2.53e-5; //2.53 from http://maia.usno.navy.mil/conv2010/chapter9/GMF.F
b_ht=5.49e-3;
c_ht=1.14e-3;
hs_km=dhgt/1000.0;
beta=b_ht/(sine+c_ht);
gamma=a_ht/(sine+beta);
topcon=(1.0+a_ht/(1.0+b_ht/(1.0+c_ht)));
ht_corr_coef=1.0/sine-topcon/(sine+gamma);
ht_corr=ht_corr_coef*hs_km;
*gmfh=*gmfh+ht_corr;
//wet
bw=0.00146;
cw=0.04391;
awm=0.0;
awa=0.0;
for (i=1;i<=55;i++) {
awm=awm+(aw_mean[i-1]*aP[i-1]+bw_mean[i-1]*bP[i-1])*1e-5;
awa=awa+(aw_amp[i-1] *aP[i-1]+bw_amp[i-1] *bP[i-1])*1e-5;
}
aw=awm+awa*cos(doy/365.25*TWOPI);
beta=bw/(sine+cw);
gamma=aw/(sine+beta);
topcon=(1.0+aw/(1.0+bw/(1.0+cw)));
*gmfw=topcon/(sine+gamma);
}
/*----------------------------------------------------------------------------
C
C NAME ECLIPS (version Sep 2011)
C
C PURPOSE DETECT ECLIPSING & YAW ROTATE ECLIP. SATELLITES
C (THE INPUT BODY-X UNIT VECTOR - SANTXYZ IS YAW-ROTATED
C BY PHI-YANGLE (THE ECL-NOMINAL) YAW ANGLE DIFFERENCE)
C
C COPYRIGHT GEODETIC SURVEY DIVISION, 2011.
C ALL RIGHTS RESERVED.
C ALL TERMS AND CONDITIONS APPLY AS DETAILED IN
C " TERMS AND CONDITIONS FOR SOFTWARE "
C
C CONTACT [email protected]
C
C UPDATE HISTORY: Aug. 23, 2011:1996-2008 W. AVERAGES of JPL REPROCESSING
C YRATE SOLUTIONS FOR ALL II/IIA CODED IN DATA
C STATEMENT, THIS ENABLES REPROCESSING FROM 1996
C Sep 26, 2011: 1. Corrected bug causing Block IIF shadow
C CROSSING MANEVURE WITH 0.06 DEG/SEC RATE EVEN
C FOR BETADG > 8 DEG
C 2. CORRECTED/improved IIA RECOVERY logic
C
C PARAMETERS DESCRIPTION
C
C IDIR DIRECTION OF PROCESSING (1=FORWARD, -1=BACKWARD)
C IPRN SV PRN NUMBER (.LE.32 FOR GPS, .GT.32 FOR GLONASS)
C TTAG OBSERVATION EPOCH TIME TAG (EG SEC OF GPS WEEK)
C SVBCOS SV BETA ANGLE (BETWEEN SV AND SUN RADIUS) COSINE 对应论文中的E
C ANOON SV BETA ANGLE LIMIT (DEG) FOR A NOON TURN MANEVURE
C ANIGHT SV BETA ANGLE LIMIT (DEG) FOR A NIGHT SHADOW CROSSING
C NECLIPS NUMBER OF ECLIPSING FOR THE PRN SATELLITE
C ECLSTM ECLIPSE START TIME(EG SEC OF GPS WEEK)
C ECLETM ECLIPSE END TIME ( " " )
C IECLIPS SV ECLIPSING (0=NO,1, 2=YES(1=night, 2=noon))
C PI = PI=3.1415926536D0
C XSV(3) SV X, Y, Z (m)(ITRF)
C SANTXYZ BODY-X UNIT VECTOR (ITRF)
C WARNING: THE IIA BODY-X ORIENTATION EXPECTED FOR THE IIR
C THE BODY-X REVERSED FOR IIR (SEE BELOW) & RETURNED
C VSVC SV INERTIAL VELOCIRY VECTOR IN ITRF
C BETA 90 DEG + THE SUN ANGLE WITH ORBITAL PLANE(IN RAD)
C IBLK SV BLOCK 1=I, 2=II, 3=IIA, IIR=(4, 5) IIF=6
C
C INTERNAL PARAMETRS DESCRIPTION
C YANGLE THE NOMINAL YAW ANGLE
C PHI THE ECLIPSING YAW ANGLE
C
C *********************************************************************
*/
static int eclips_(int IPRN, double SVBCOS, double ANIGHT, double BETA, double TTAG,
double XSV[3], double SANTXYZ[3], double VSVC[3], int IBLK)
{
int i,j,ii;
int IECLIPS;
int IDIR=1;
double TWOHR, HALFHR;
double ANOON;
double CNOON, CNIGHT;
double DTR, DTTAG;
double MURATE, YANGLE, DET, BETADG, PHI=0.0, SANTX, SANTY, v[3], r[3];
double YAWEND;
double ECLSTM, ECLETM;
int NOON, NIGHT;
// MAX YAW RATES OF CURRENT&PAST BLOCK II/IIA's,(AVER'D 1996-2008 JPL SOLUTIONS)
// CHANGE IF REQUIRED OR INPUT IF ESTIMATED
// PRN 01 02 03 04 05 06 07
double YRATE[]= { .1211, .1339, .123, .1233, .1180, .1266, .1269,
// 08 09 10 11 12 13 14 15
.1033, .1278, .0978, 0.200, 0.199, 0.200, 0.0815, .1303,
// PRN 16 17 18 19 20 21 22 23
.0838, .1401, .1069, .098, .103, 0.1366, .1025, .1140,
// PRN 24 25 26 27 28 29 30 31
.1089, .1001, .1227, .1194, .1260, .1228, .1165, .0969,
// PRN 32 33-64: GLONASS RATES (DILSSNER 2010)
.1152,
0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250,
0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250,
0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250,
0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250, 0.250
};
ECLSTM=ECLETM=-1e6;
// CHECK FOR BLOCK IIR AND FIX TO NOMINAL YAW RATE
if( IPRN<=MAXPRNGPS && IBLK>=4 ) YRATE[IPRN-1]=0.2;
// THE NEW GPS BLK IIF YAW RATES ( DILSSNER (2010) INSIDE GNSS)
if( IPRN<=MAXPRNGPS && IBLK>=6 ) YRATE[IPRN-1]=0.11;
IECLIPS=0;
TWOHR = 7200.0;
HALFHR= 1800.0;
DTR=D2R;
// compute the noon beta angle limit (beta zero) FOR A NOON TURN from YRATEs
// & THE ACTUAL SAT ORBIT ANGLE RATE (MURATE) (~0.00836 FOR GPS; ~ 0.00888 GLNS)
MURATE= sqrt( ( pow(VSVC[1-1],2) + pow(VSVC[2-1],2) + pow(VSVC[3-1],2) ) /
( pow(XSV[1-1], 2) + pow(XSV[2-1], 2) + pow(XSV[3-1], 2) )
) / DTR;
ANOON=atan(MURATE/YRATE[IPRN-1])/DTR;
CNOON=cos(ANOON*DTR);
CNIGHT=cos(ANIGHT*DTR);
//
NOON=0;
NIGHT=0;
BETADG = BETA/DTR - 90.0;
if ( 40==IPRN && 14==PPP_Glo.ctNow[3] ) {
ii=0;
}
//
if ( IPRN>MAXPRNGPS && fabs(BETADG)<ANOON ) {
// GLONASS NOON TURN MODE ACORDING TO DILSSNER 2010
YAWEND=75.0;
// ITERATION FOR YAWEND OF THE GLONASS NOON TURN
for (j=1;j<=3;j++) {
YAWEND=fabs( atan2( -tan(BETADG*DTR), sin(PI-DTR*MURATE*YAWEND/YRATE[IPRN-1]) ) / DTR
- atan2( -tan(BETADG*DTR), sin(PI+DTR*MURATE*YAWEND/YRATE[IPRN-1]) ) / DTR
)/2.0;
}
// UPDATE ANOON, CNOON FOR NEW GLONASS NOON TURN LIMITS
ANOON= MURATE*YAWEND/YRATE[IPRN-1];
CNOON= cos(ANOON*DTR);
}
// BLK IIR'S
if( IBLK==4 || IBLK==5 ) {
CNIGHT=cos((ANOON+180.0)*DTR);
for (j=1;j<=3;j++) {
// BODY-X U VECTOR REVERSAL FOR IIR ONLY
SANTXYZ[j-1]=-SANTXYZ[j-1];
}
}
//
if ( SVBCOS < CNIGHT )
NIGHT=1;
if ( SVBCOS > CNOON )
NOON=1;
//
// IF SV IN NIGHT SHADOW OR NOON TURN DURING FORWARD PASS
// STORE START AND END TIME OF YAW MANEUVRE (FOR THE BACKWARD RUN)
//
//acos: 0-pi
// YAW ANLGE
YANGLE= acos( (SANTXYZ[1-1]*VSVC[1-1] + SANTXYZ[2-1]*VSVC[2-1] + SANTXYZ[3-1]*VSVC[3-1] ) /
sqrt( pow(VSVC[1-1],2) + pow(VSVC[2-1],2) + pow(VSVC[3-1],2) )
) / DTR;
// IIR YANGLE has the same sign as beta, II/IIA has the opposite sign
if( BETADG<0.0 && IBLK>=4 && IBLK<=5 )
YANGLE=-YANGLE;
if( BETADG>0.0 && IBLK!=4 && IBLK!=5 )
YANGLE=-YANGLE;
//
if( (NIGHT || NOON) ) {
DET=SQRT( pow(180.0-acos(SVBCOS)/DTR, 2) - pow(BETADG,2) );
PHI = PI/2.0;
// Check if already after a midnight or noon
if ( NIGHT ) {
if (IBLK==4 || IBLK==5) {
if ( fabs(YANGLE)>90.0 ) DET=-DET;
if ( DET!=0.0 ) PHI=atan2( tan(BETADG*DTR),-sin(-DET*DTR) )/DTR;
}
else {
// BLK IIA & GLONASS TOO !
if ( fabs(YANGLE)<90.0 ) DET=-DET;
if ( DET!=0.0 ) PHI=atan2(-tan(BETADG*DTR), sin(-DET*DTR) )/DTR;
}
}
if( NOON ) {
DET=SQRT( pow(acos(SVBCOS)*180.0/PI,2) - pow(BETADG,2) );
if( IBLK==4 || IBLK==5 ) {
if ( fabs(YANGLE)<90.0 ) DET=-DET;
if ( DET!=0.0 ) PHI=atan2(tan(BETADG*DTR), -sin(PI-DET*DTR))/DTR;
}
else {
// BLK IIA & GLONASS !
if( fabs(YANGLE)>90.0 ) DET=-DET;
if( DET!=0.0 ) PHI=atan2(-tan(BETADG*DTR),sin(PI-DET*DTR))/DTR;
}
}
// ONLY FORWARD
//计算正午/午夜机动，地影恢复期时间段
if (IDIR > 0 ) {
//
// INITIALIZE ECLIPSE START AND TIME TAG ARRAYS
//
//1
//if ( NECLIPS[IPRN-1] == 0 )
{
//NECLIPS[IPRN-1]=NECLIPS[IPRN-1]+1;
ECLSTM=TTAG+DET/MURATE;
// IIR MIDNIGHT/NOON TURN or II/IIA NOON TURN START
// for IIR/GLONAS NIGHT (turn) only makes sense when BETADG < ANOON!
// For IIA it gets here only when NOON is true and that happens only when BETADG < ANOON!
YAWEND=atan(MURATE/YRATE[IPRN-1])/DTR;
if(((IBLK>3 && IBLK<=5) || NOON) && fabs(BETADG)<YAWEND ) {
// GLONASS
if ( IPRN > MAXPRNGPS ) {
// GLONASS NOON TURN MODE ACORDING TO DILSSNER ET AL 2010
ECLSTM = ECLSTM - ANOON/MURATE;
ECLETM = ECLSTM + 2.0*ANOON/MURATE;
}
else {
// GPS IIA/IIR/IIF NOON OR IIR MIDNIGHT TURNs
ECLSTM = ECLSTM - fabs(BETADG)*sqrt(ANOON/fabs(BETADG)-1.0)/MURATE;
ECLETM = ECLSTM + 2*fabs(BETADG)*sqrt(ANOON/fabs(BETADG)-1.0)/MURATE;
}
}
// II/IIA SHADOW START & END TIMES
if ( (IBLK<=3 || IBLK>5) && NIGHT ) {
//if (ANIGHT<180)
// ANIGHT+=180;
ECLSTM = ECLSTM - SQRT( pow(ANIGHT-180.0,2) - pow(BETADG,2) )/MURATE;
ECLETM = ECLSTM + 2.0*SQRT( pow(ANIGHT-180.0,2) - pow(BETADG,2) )/MURATE;
}
//
// UPDATE SV COSINE AND TIME TAG ARRAYS
// (TO BE USED DURING BACKWARDS RUN)
//
if ( (NIGHT && SVBCOS<CNIGHT) || (NOON && SVBCOS>CNOON) ) {
DTTAG= fabs(TTAG-ECLSTM);
//
// ECLIPSE TIME IS MORE THAN 2 HOURS, THIS IS A NEW ECLIPSE!
//
if ( DTTAG>TWOHR ) {
ECLSTM=TTAG+DET/MURATE;
// IIR MIDNIGHT/NOON TURN or II/IIA NOON TURN START
// AND GLONASS NOON
if ((IBLK>3 && IBLK<=5) || NOON) {
// GLONASS
if (IPRN>MAXPRNGPS) {
// GLONASS NOON TURN MODE ACORDING TO DILSSNER ET AL 2010
ECLSTM = ECLSTM - ANOON/MURATE;
ECLETM = ECLSTM + 2.0*ANOON/MURATE;
}
else {
// GPS TURNS ONLY
ECLSTM = ECLSTM - fabs(BETADG)*sqrt(ANOON/fabs(BETADG)-1.0)/MURATE;
ECLSTM = ECLSTM +2*fabs(BETADG)*sqrt(ANOON/fabs(BETADG)-1.0)/MURATE;
}
}
}
// II/IIA SHADOW START & END TIMES
// & GLONASS & IIF AS WELL !
if ( (IBLK<=3||IBLK>5) && NIGHT) {
//if (ANIGHT<180)
// ANIGHT+=180;
ECLSTM = ECLSTM - SQRT( pow(ANIGHT-180.0,2)-pow(BETADG,2) )/MURATE;
ECLSTM = ECLSTM + 2.0*SQRT( pow(ANIGHT-180.0,2)-pow(BETADG,2) )/MURATE;
}
}
}
// END OF FORWARD LOOP (IDIR = 1)
}
}
//
// BOTH FWD (IDIR= 1) OR BWD (IDIR=-1)
// SET ECLIPSE FLAG (1=NIGHT SHADOW, 2=NOON TURN)
//
if ( 1 ) {
// CHECK IF IPRN IS ECLIPSING AND WHICH SEQ NO (I)
i=0;
for ( j=1;j<=1;j++ ) {
if ( fabs(ECLETM+1.0e6)<=1.0e-8 && fabs(ECLSTM+1.0e6)<=1.0e-8 )
continue;
if ( TTAG>=ECLSTM && TTAG<=(ECLETM+HALFHR) )
i=j;
}
// CURRENTLY NOT ECLIPSING (i=0)
if ( 0==i ) return IECLIPS;
//判断此时时间是否在正午/午夜机动，地影恢复期
if ( TTAG>=ECLSTM && TTAG<=(ECLETM+HALFHR) ) {
// velocity & radius unit vectors V & R