diff --git a/pkg/calculator/sofa.go b/pkg/calculator/sofa.go
index 1d7abe1..85b853a 100644
--- a/pkg/calculator/sofa.go
+++ b/pkg/calculator/sofa.go
@@ -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)
diff --git a/pkg/producer/aux.go b/pkg/producer/aux.go
index c93fa97..171e4f7 100644
--- a/pkg/producer/aux.go
+++ b/pkg/producer/aux.go
@@ -114,9 +114,17 @@ func (r *Registrator) SetSceneBoundary(scene *Scene) (topLeft, bottomRight orb.P
 	endTime := time.Unix(int64(auxilary.ReferenceTime2000)+int64(ae.UTCTimeSec), int64(ae.Microsecond)*1000).UTC()
 
 	startPos84 := []float64{as.W84PosX, as.W84PosY, as.W84PosZ}
-	startPosECI := []float64{as.J2000PosX, as.J2000PosY, as.J2000PosZ}
+	startPosECI := []float64{
+		as.J2000PosX + as.J2000VelX*float64(as.Microsecond)/10e6,
+		as.J2000PosY + as.J2000VelY*float64(as.Microsecond)/10e6,
+		as.J2000PosZ + as.J2000VelZ*float64(as.Microsecond)/10e6,
+	}
 	endPos84 := []float64{ae.W84PosX, ae.W84PosY, ae.W84PosZ}
-	endPosECI := []float64{ae.J2000PosX, ae.J2000PosY, ae.J2000PosZ}
+	endPosECI := []float64{
+		ae.J2000PosX + ae.J2000VelX*float64(ae.Microsecond)/10e6,
+		ae.J2000PosY + ae.J2000VelY*float64(ae.Microsecond)/10e6,
+		ae.J2000PosZ + ae.J2000VelZ*float64(ae.Microsecond)/10e6,
+	}
 
 	// FIXME: GPS 拟合效果不佳
 	// x0 := float64(r.auxHeads[startPosInAux].TimeSec) + float64(r.auxHeads[startPosInAux].TimeSecFrac)/10e6