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ECI->ECEF

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nuknal
2024-08-16 16:18:49 +08:00
parent c2480a828b
commit 85f9f44653
2 changed files with 56 additions and 4 deletions
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48
pkg/calculator/sofa.go
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@@ -8,7 +8,7 @@ import (
)
func ECItoECEF(j2000X, j2000Y, j2000Z float64, utc time.Time) (float64, float64, float64) {
j2000Position := [3]float64{j2000X, j2000Y, j2000Z}
eci := [3]float64{j2000X, j2000Y, j2000Z}
var ecef [3]float64
// 当前的 TT 时间 (Terrestrial Time)
@@ -43,10 +43,54 @@ func ECItoECEF(j2000X, j2000Y, j2000Z float64, utc time.Time) (float64, float64,
gofa.C2t06a(tt1, tt2, ut11, ut12, xp, yp, &rc2t)
// 计算 ECEF 坐标
gofa.Rxp(rc2t, j2000Position, &ecef)
gofa.Rxp(rc2t, eci, &ecef)
return ecef[0], ecef[1], ecef[2]
}
func ECEFtoECI(X84, Y84, Z84 float64, utc time.Time) (float64, float64, float64) {
ecef := [3]float64{X84, Y84, Z84}
var eci [3]float64
// 当前的 TT 时间 (Terrestrial Time)
var tt1, tt2 float64
gofa.Dtf2d("UTC",
utc.Year(),
int(utc.Month()),
utc.Day(),
utc.Hour(),
utc.Minute(),
float64(utc.Second()),
&tt1, &tt2)
var djm0, mjd float64
gofa.Cal2jd(int(utc.Year()), int(utc.Month()), int(utc.Day()), &djm0, &mjd)
var dut1 float64 = 0.0562
xp := 0.0
yp := 0.0
if e, ok := EOP.Get(mjd); ok {
xp = e.Xp
yp = e.Yp
dut1 = e.Dut1
}
// 计算 UT1 时间 世界时UT1与协调世界时UTC
var ut11, ut12 float64
gofa.Utcut1(tt1, tt2, dut1, &ut11, &ut12)
// 计算 C2T 矩阵 (ICRS -> CIRS -> ECEF)
var rc2t [3][3]float64
gofa.C2t06a(tt1, tt2, ut11, ut12, xp, yp, &rc2t)
// 计算 ECEF 到 ECI 的转换矩阵
var rc2tT [3][3]float64
gofa.Tr(rc2t, &rc2tT)
// 将 ECEF 坐标转换为 ECI 坐标
gofa.Rxp(rc2tT, ecef, &eci)
return eci[0], eci[1], eci[2]
}
func ECEFGeocentricToGeodetic(x, y, z float64) (float64, float64, float64) {
var lat, lon, alt float64
gofa.Gc2gd(gofa.WGS84, [3]float64{x, y, z}, &lon, &lat, &alt)