State prediction device and state prediction method
AssigneeMitsubishi Electric Corporation
InventorsTetsutaro YAMADA, Tomoyuki KOYANAGI, Toshihiko ARIOKA, Hiroaki ISHIKAWA, Hiroshi KAMEDA
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Abstract
The state prediction device smoothes a state vector including a flow rate and a water level of a tsunami at each of a plurality of points set two-dimensionally in a region including a coverage area, by using flow velocity observed values of a sea surface in a plurality of cells extending in a plurality of range directions and a plurality of beam directions in the coverage area of a radar.
Claims10
A state prediction device comprising:
- processing circuitry to
- predict a state vector at next time using a two-dimensional shallow water equation that expresses propagation of a tsunami, the state vector including a flow rate and a water level of a tsunami at each of a plurality of points set two-dimensionally in a region including a coverage area of a radar;
- collectively smooth the predicted state vector in the coverage area using a Kalman filter, by using a Kalman gain, the predicted state vector, and an observation vector including flow velocity observed values of a sea surface in a plurality of cells extending in a plurality of range directions and a plurality of beam directions in the coverage area;
- and
- set an initial value used for the prediction of the state vector.
A state prediction device comprising:
- processing circuitry to
- predict a state vector at next time, the state vector including a flow rate and a water level of a tsunami at each of a plurality of points set two-dimensionally in a region including a coverage area of a radar;
- linearly interpolates the predicted state vector to create an observation matrix that linearly transforms the state vector into an observation vector including flow velocity observed values of a sea surface in a plurality of cells extending in a plurality of range directions and a plurality of beam directions in the coverage area, and smooth the state vector using the created observation matrix;
- and
- set an initial value used for the prediction of the state vector.
A state prediction method using a state prediction device provided with processing circuitry, the state prediction method comprising:
- setting an initial value used for predicting a state vector including a flow rate and a water level of a tsunami at each of a plurality of points set two-dimensionally in a region including a coverage area of a radar;
- predicting the state vector at next time using a two-dimensional shallow water equation that expresses propagation of a tsunami;
- and
- collectively smoothing the predicted state vector in the coverage area using a Kalman filter, by using a Kalman gain, the predicted state vector, and an observation vector including flow velocity observed values of a sea surface in a plurality of cells extending in a plurality of range directions and a plurality of beam directions in the coverage area.
A state prediction method using a state prediction device provided with processing circuitry, the state prediction method comprising:
- setting an initial value used for predicting a state vector including a flow rate and a water level of a tsunami at each of a plurality of points set two-dimensionally in a region including a coverage area of a radar;
- predicting the state vector at next time;
- and
- linearly interpolates the predicted state vector to create an observation matrix that linearly transforms the state vector into an observation vector including flow velocity observed values of a sea surface in a plurality of cells extending in a plurality of range directions and a plurality of beam directions in the coverage area, and smoothing the state vector using the created observation matrix.
Dependencies are inferred from the claim text.