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ionppp: station height must be less than iono layer height #860

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ionppp: station height must be less than iono layer height #860

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22 changes: 14 additions & 8 deletions src/rtkcmn.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3721,7 +3721,7 @@ extern double ionmodel(gtime_t t, const double *ion, const double *pos,
*-----------------------------------------------------------------------------*/
extern double ionmapf(const double *pos, const double *azel)
{
if (pos[2]>=HION) return 1.0;
if (pos[2]>=HION) return 0.0;
return 1.0/cos(asin((RE_WGS84+pos[2])/(RE_WGS84+HION)*sin(PI/2.0-azel[1])));
}
/* ionospheric pierce point position -------------------------------------------
Expand All @@ -3738,17 +3738,23 @@ extern double ionmapf(const double *pos, const double *azel)
extern double ionppp(const double *pos, const double *azel, double re,
double hion, double *posp)
{
double cosaz,r,rp,ap,sinap,tanap;
// Guard.
if (pos[2] / 1000 >= hion) {
posp[0] = pos[0];
posp[1] = pos[1];
posp[2] = (re + hion) * 1000;
return 0.0;
}

/* The radius at the receiver station. */
r=re+pos[2]/1000.0;
double r=re+pos[2]/1000.0; // km
/* asin(rp) is the zenith angle at the IPP. */
rp=r/(re+hion)*cos(azel[1]);
double rp=r/(re+hion)*cos(azel[1]);
/* The angle at the center of the earth. */
ap=PI/2.0-azel[1]-asin(rp);
sinap=sin(ap);
tanap=tan(ap);
cosaz=cos(azel[0]);
double ap=PI/2.0-azel[1]-asin(rp);
double sinap=sin(ap);
double tanap=tan(ap);
double cosaz=cos(azel[0]);
posp[0]=asin(sin(pos[0])*cos(ap)+cos(pos[0])*sinap*cosaz);

if ((pos[0]> 70.0*D2R&& tanap*cosaz>tan(PI/2.0-pos[0]))||
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