Last updated by Hiroshi Takeuchi, 11 January 2026.

JAXA station coordinates

All locations are in ITRF2014 reference frame at epoch 2015.0. (Old version is here.)

Positions and velocities of the Usuda 64-m antenna

Coordinates of the Usuda 64-m antenna is represented by a piece-wise linear model due to co-seismic and post-seismic motion of the station. 
Start(UTC)           End(UTC)             X[m]            Y[m]           Z[m]           Vx[m/year]     Vy[m/year]    Vz[m/year]   Epoch
2000-01-01T00:00:00  2004-09-05T00:00:00  -3855355.43658  3427427.56470  3740971.07537  -3.91914E-03   2.53030E-03  -1.07669E-02  2015.0
2004-09-05T00:00:00  2011-03-11T05:46:18  -3855355.42937  3427427.56506  3740971.09988  -3.22138E-03   2.56472E-03  -8.39229E-03  2015.0
2011-03-11T05:46:18  2011-09-14T00:00:00  -3855356.02340  3427427.00683  3740971.36751  -1.19216E-01  -8.83912E-02   4.92169E-02  2015.0
2011-09-14T00:00:00  2012-11-01T00:00:00  -3855355.76807  3427427.15969  3740971.23308  -4.17969E-02  -4.20416E-02   8.45388E-03  2015.0
2012-11-01T00:00:00  2014-06-04T00:00:00  -3855355.74397  3427427.20811  3740971.22058  -3.06620E-02  -1.96717E-02   2.67962E-03  2015.0
2014-06-04T00:00:00  2017-06-01T00:00:00  -3855355.73775  3427427.21240  3740971.21954  -1.98726E-02  -1.22256E-02   8.68159E-04  2015.0
2017-06-01T00:00:00  2020-04-01T00:00:00  -3855355.75050  3427427.20937  3740971.22814  -1.45977E-02  -1.09720E-02  -2.69156E-03  2015.0
2020-04-01T00:00:00  2024-01-01T07:10:23  -3855355.75074  3427427.18599  3740971.22281  -1.45512E-02  -6.51700E-03  -1.67733E-03  2015.0
2024-01-01T07:10:23  present              -3855355.78642  3427427.18096  3740971.21146  -8.36402E-03  -5.34765E-03   1.57272E-03  2015.0
Currently a fixed bias vector model between the GPS and VLBI points (GPS -> VLBI bias vector: [92.38177, 4.99729, 49.11992] [m]) is assumed. One-sigma position accuracy of each component seems to be about a few centimeters. Since not much time has passed since the 2024 Noto earthquake, the station velocities after the earthquake are still quite uncertain. Therefore, we plan to continue making regular geodetic observations and update them accordingly.

X
Usuda GNSS & 64-m antenna positions X (click to enlarge)
Y
Usuda GNSS & 64-m antenna positions Y (click to enlarge)
Z
Usuda GNSS & 64-m antenna positions Z (click to enlarge)

Usuda 64-m antenna has a DSN station id of DSS-48. Geodetic coorinates (GRS80) of the antenna refference point and the height above EGM96 geoid at the epoch of 2026.0 are as follows:
Geodetic latitude (GRS80) 36.132403748°N (36° 7' 56.65349" N)
Longitude (GRS80) 138.362773862° E (138° 21' 45.98590" E)
Ellipsoidal height (GRS80) 1532.8122 [m]
Orthometric height (height above EGM96 geoid) 1490.1922 [m]
Geoid height (= Ellipsoidal height - Orthometric height) 42.620 [m]
The height of the weather station at Usuda is 34-meter lower than that of the reference point of the 64-m antenna. Barometric pressure shall be calibrated by the user of the weather data from Usuda. Downlink horizon mask for Usuda 64-m antenna: UDSC_horizon_mask.xls.

Position and velocity of the Misasa 54-m antenna

Coordinates of the Misasa 54-m antenna is represented by a piece-wise linear model due to co-seismic and post-seismic motion of the station. 
Start(UTC)           End(UTC)             X[m]            Y[m]           Z[m]      Vx[m/year]    Vy[m/year]     Vz[m/year]      Epoch
2019-01-01T00:00:00  2024-01-01T07:10:23  -3854373.559  3427836.305   3741813.007 -1.40516E-02  -6.99384E-03   -9.561610E-04   2015.0
2024-01-01T07:10:23  present              -3854373.580  3427836.264   3741813.005 -9.36884E-03  -1.74049E-03    1.246776E-03   2015.0
Misasa 54-m antenna has a DSN station id of DSS-30. Since the 54-m antenna lacks an S-band receiver, conventional S/X geodetic VLBI cannot be used to measure the station coordinates. Approximate position of the 54-m antenna was measured from the IGS refeference antennas at Usuda and Misasa with Total Station on September 6, 2019. After that the 54-m antenna co-observed in the S/X geodetic VLBI sesions, in which Usuda 64-m antenna joined, with only X-band receiver several times. Ionospheric correction was made by the Usuda's data for such sessions. In addition, the X/Ka VLBI campaign with DSN antennas has started and some initial results have been obtained. Since the observation period is still not very long, the consistency and repeatability among these results are not yet very high, so we assume a formal error of about 5-10 cm for the station position errors. Currently a fixed bias vector model between the GPS and VLBI points at Misasa (GPS -> VLBI bias vector: [24.9810, 48.2593, 82.8457] [m]) is assumed.

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Misasa GNSS & 54-m antenna positions X (click to enlarge)
Y
Misasa GNSS & 54-m antenna positions Y (click to enlarge)
Z
Misasa GNSS & 54-m antenna positions Z (click to enlarge)

Geodetic coorinates (GRS80) of the antenna refference point and the height above EGM96 geoid at the epoch of 2026.0 are as follows:
Geodetic latitude (GRS80) 36.140984502°N (36° 8' 27.54421" N)
Longitude (GRS80) 138.35212867°E (138° 21' 7.66321" E)
Ellipsoidal height (GRS80) 1655.993 [m]
Orthometric height (height above EGM96 geoid) 1613.380 [m]
Geoid height (= Ellipsoidal height - Orthometric height) 42.613 [m]
The height of the weather station at Misasa is 30.5 meter lower than that of the reference point of the Misasa 54 m antenna. Barometric pressure shall be calibrated by the user of the weather data from Misasa. Downlink horizon mask for Misasa 54-m antenna: Misasa_horizon_mask.xls.

Position and velocity of the Uchinoura 34-m antenna

The coordinate of the Uchinoura 34-m antenna has not been affected by the earthquake. 
Start(UTC)           End(UTC)             X[m]            Y[m]           Z[m]           Vx[m/year]       Vy[m/year]       Vz[m/year]       Epoch
2008-01-20T00:00:00  present              -3586229.5989   4114103.6654   3290224.6120   -0.03177         -0.00748         -0.01147         2015.0
Uchinoura 34 m antenna has a DSN station id of DSS-38. One-sigma position accuracy of each component is about 3 cm. Geodetic coorinates (GRS80) of the antenna refference point and the height above EGM96 geoid at the epoch of 2026.0 are as follows:
Latitude (GRS80) 31.25430804°N (31° 15' 15.50895" N)
Longitude (GRS80) 131.078392333°E (131° 4' 42.21240" E)
Ellipsoidal height (GRS80) 375.7827 [m]
Orthometric height (height above EGM96 geoid) 346.445 [m]
Geoid height (= Ellipsoidal height - Orthometric height) 29.338 [m]
The height of the weather station at Uchinoura is 23.95 meter lower than that of the reference point of the Uchinoura 34 m antenna. Barometric pressure shall be calibrated by the user of the weather data from Uchinoura. Downlink horizon mask for Uchinoura 34-m antenna: USC_horizon_mask.xls.

Position of the Uchinoura 20-m antenna

Start(UTC)           End(UTC)             X[m]            Y[m]           Z[m]           Vx[m/year]       Vy[m/year]       Vz[m/year]      Epoch
2008-01-20T00:00:00  present              -3586293.8662   4113888.6263   3290452.1716   -0.03177         -0.00748         -0.01147         2015.0
Uchinoura 20 m antenna has a DSN station id of DSS-37. Position accuracy of the Uchinoura 20 m antenna is unknown.