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Processing and Solutions

Location of Hiratsuka GPS buoy and epi center of Tohoku-oki earthquake on March 11, 2011.

Height Estimate for GPS Buoy
Height changes of GPS buoy at Hiratsuka. Tsunami signals is observed in the height solution. Real-time orbit and clock from Veripos APEX is used for the processing.

Sample data and Setting

Item/Parameters Notes and Setting
Processing PPP processing
Purpose Tsunami and ocean wave monitoring with GNSS buoy
Stations Hiratsuka GPS buoy data
(Please use the template file by replacing the stations).
Processing time window 2011/03/11 00:00-18:00 GPST
(Please use the template file by cahnging the time-window setting).
Used data GPS phase L3 (IF: Ionosphere free) , 1Hz processing
Get data Redistribution is restricted.
Data is provided from Meguro Lab., Tokyo university.
Satellite products Veripos APEX real-time satellite products (GPS+GLONASS) are used (any standard products can be used, see products available publicly.
Setting in processing PPP kinematic processing (a priori coordinate for each epoch comes from Bancroft solution )
Constrain A priori coordinate 1,000m, Coordinate change 100m/s, ZTD 1e-5 m/s
Processing cost About 15 minutes
Validation Compare tsunami height in GNSS buoy with tide gauge and pressure sensor in sea bottom. Validate solutions at fixed station with setting of the same constrain.