38 results about "Satellite altimeter" patented technology

The invention discloses an external calibration method of a satellite-borne interferometric synthetic aperture radar (InSAR) system. The external calibration method comprises that sea surface height data is measured by a satellite height gauge, and average sea surface height data is acquired after time varying influence factors are removed; sea surface height data measured by the satellite-borne InSAR system is acquired through sea images and uncalibrated interference parameters of preset time and space distribution acquired by the satellite-borne InSAR system; sea height variation brought about by the time varying influence factors except for the spreading effect under the condition of the preset time and space distribution is calculated in a simulation mode; time varying synthesized sea surface height data is acquired by the average sea surface height and the sea surface height variation brought about by time varying influence factors except for the spreading effect; and the sea surface height data measured by the satellite-borne InSAR system is corrected by taking the time varying synthesized sea surface height data as standard data, thereby realizing calibration of the satellite-borne InSAR system. According to the invention, an external calibration method based on a sea field is adopted, thereby being capable of carrying out long-term dynamic monitoring on slow variation elements in error of the satellite-borne InSAR system.

A significant wave height and wave period parameterization method comprises the following steps that 1. buoy data of five fixed buoy stations of JMA, satellite height meter significant wave height hs provided by AVISO and 1 degree * 1 degree reanalysis grid point data of sea surface 10 m wind speed are obtained, wind speed at observed height is converted into 10 m height wind speed U10, average wave height and an average wave period are converted into significant wave height hs and a significant wave period Tp; 2.based on a data mining technology, according to the proportion of 2 : 1 : 1, the five fixed buoy stations and data of height meter grid point information are divided into a training set, a verifying set ad a testing set, and data obtained through a 44008 station are only divided into a verifying set and a testing set according to the proportion of 1 : 1; and 3. the significant wave height parameterization method is established and verified.

The invention discloses a mesoscale vortex detection method for incrementally deployed sensors. First, the position and spatial scale of the ocean vortex are determined according to satellite altimeter data, the velocity field of the vortex area is constructed, and the sensors are deployed in the target area in a uniform deployment manner. And establish a mathematical model of sensor deployment; then, when the sensor coverage in the target area drops to a threshold, determine the number of sensors that need to be incrementally deployed according to the number of effective sensors in the target area; finally, according to the hole position in the target area, Deploy sensors incrementally. The invention adopts the method of incrementally deploying sensors, which can effectively enhance the sensor coverage of the target area and realize the detection of ocean mesoscale eddies.

The present invention provides a sea area gravity anomaly inversion method and system based on satellite altimetry data. The method includes: calculating the sea surface height gradient of the sub-satellite point according to the sea surface height data collected by the satellite altimeter at the sub-satellite point in the preset sea area, According to the position of the sub-satellite point, the model vertical deviation gradient of the sub-satellite point is calculated, and the sea surface height gradient of the sub-satellite point is subtracted from the model vertical line deviation gradient to obtain the remaining gradient of the sub-satellite point; The remaining gradient of the next point is converted into a vertical deviation grid to obtain the remaining vertical deviation of the grid; the residual gravity anomaly of the grid is calculated according to the remaining vertical deviation of the grid, and the model gravity anomaly of the grid is calculated based on the gravity field model. Add the model gravity anomaly of the grid to the remaining gravity anomaly to obtain the gravity anomaly of the sea area of ​​the grid. The present invention realizes obtaining accurate sea area gravity anomalies through rigorous theoretical derivation.