7 results about "Satellite altimeter" patented technology

The application discloses a cross-dimension multi-source satellite altimeter sea level anomaly joint estimation method and system, and relates to the field of ocean remote sensing.The joint estimation method comprises the following steps: obtaining multi-source observation data of a target sea area about a target period, forming a corrected joint observation data set through cross-dimension data processing and reconstruction operation and bias correction operation, and mapping the corrected joint observation data set to a corresponding regular space-time grid of the target sea area; based on a preset space-time search radius, constructing an observation operator, a background covariance matrix and an observation error covariance matrix corresponding to each grid point in the regular space-time grid, and generating a regular gridded sea level anomaly product of the target sea area about the target period through an optimal interpolation method without performing explicit system error correction.The application can consider large-scale background consistency and small and medium-scale structure resolution capability on multiple spatial scales, and improves the spatial continuity, statistical consistency and overall stability of the sea level anomaly estimation result.

The application belongs to the technical field of circulation mixing coefficient estimation, and discloses a global estimation method, system, device and terminal of a wave-induced turbulent mixing model, the global estimation method of the wave-induced turbulent mixing model comprising: estimating the global three-dimensional structure of the internal tide-induced turbulent mixing coefficient based on the wave-induced turbulent mixing coefficient, the internal tide information extracted by the satellite altimeter and the WOA13 temperature and salinity data; determining the structure of the global internal wave spectrum; and estimating the distribution characteristics of the global annual average internal wave-induced turbulent mixing coefficient BVIW. The internal tide information extraction comprises: obtaining, processing and filtering satellite along-track sea surface height anomaly data, performing tidal harmonic analysis on the filtered data, and obtaining the internal tide harmonic constant of the global ocean tidal frequency M2. According to the derived mixing coefficient, new mixing is not created, but a mixing process that is not available under the existing framework and is rich in physical connotation is created, and the important significance of wave mixing to the circulation is given.

The invention discloses a sea surface height continuous expression and reconstruction method and system for sparse satellite orbit observation, and the method comprises the steps: forming an input-output data pair according to three-dimensional time-space coordinates of an observation point of a satellite altimeter and an original along-orbit sea surface height observation value of the satellite altimeter; the three-dimensional time-space coordinates are converted into meshless continuous input coordinates; constructing a space-time continuous expression model based on implicit neural representation on the basis of a network structure of a sine cycle activation function, introducing gradient field consistency constraint and total variation regularization, and constructing comprehensive loss; and according to global sea surface height estimation output by the model, reconstructing a regular grid, calculating a sea surface height gradient, gradient change, local curvature and power agent quantity, completing continuous expression and reconstruction of the sea surface height, and realizing synchronous and high-quality reconstruction of a fine structure and an overall scene of a sea surface height field. And the defects of non-uniform sampling, high-gradient recovery and micro-analysis capability in the prior art can be effectively overcome.

The present application belongs to the field of marine surveying and geodetic surveying, and discloses a far-sea GNSS buoy height reference transmission method combined with satellite altimeter, aiming to solve the technical problems of difficult transmission of 1985 national height reference in far-sea area and large height measurement error of GNSS buoy antenna, the method establishes height reference conversion relationship through shore-based leveling joint measurement, carries out precise positioning and calculation on far-sea GNSS buoy observation data, and retains effective sea surface information through low-pass filtering processing; combines satellite altimeter data to carry out space-time matching, inverses and dynamically corrects the height of buoy antenna, converts the ellipsoidal height of buoy sea surface into 1985 national height through geodetic datum difference correction, and finally outputs the results through quality evaluation. The method realizes accurate transmission of far-sea height reference and dynamic correction of the height of buoy antenna, guarantees the reliability of far-sea sea surface height calculation, and provides accurate height data support for far-sea marine observation, marine engineering and other fields.

The invention discloses an absolute sea surface elevation measurement system based on an offshore mobile platform, which relates to the field of marine surveying and mapping and satellite remote sensing calibration and comprises an offshore mobile platform part, a shore-based static GNSS (Global Navigation Satellite System) base station and a data processing module, the offshore mobile platform part is integrated with a GNSS antenna and receiver, an attitude sensor, a radar tide gauge and a data acquisition and storage module; the shore-based static GNSS base station provides static coordinates and GNSS observation data, and the data processing module comprises a shore-based base station resolving module for resolving to obtain three-dimensional coordinates; the offshore platform GNSS dynamic resolving module is used for resolving a dynamic position; and the absolute sea surface height calculation module is used for calculating the initial sea surface height and outputting a final result through low-pass or median filtering. The device does not need to distribute a buoy, can be directly carried on a ship, a floating platform and other mobile platforms, realizes high-precision, continuous and safe absolute sea surface elevation measurement, and is suitable for satellite altimeter calibration and other application scenes.

The invention provides a global dynamic ocean front identification method based on remote sensing data. The global dynamic ocean front identification method based on remote sensing data comprises the following steps: S1, acquiring and preprocessing infrared satellite remote sensing data and satellite altimeter data; s2, based on a double-threshold method of a Bayes decision model, identifying an ocean peak region; s3, identifying the ocean frontal line based on a kinetic method of a geostationary flow speediness mechanism; s4, performing space-time distribution tracking analysis on the identified ocean frontal line based on a tracking algorithm of connected region centroid matching; and S5, carrying out feature analysis on the tracked ocean frontal line. The global dynamic ocean front identification method based on remote sensing data provided by the invention has the advantages that the ocean front can be comprehensively identified by using the temperature gradient and the earth turning flow velocity, so that the accuracy and continuity of ocean front identification are improved.

The invention provides a data processing method based on ocean tide quasi-harmonic analysis, and relates to the technical field of physical oceanography. The data processing method based on ocean power flow quasi-harmonic analysis comprises the following steps: S1, based on satellite altimeter surface flow velocity data, coastal radar horizontal flow field data and buoy vertical profile data, aligning a space-time reference by adopting a space-time registration algorithm, dynamically fusing three types of data sources through Bayesian weighted Kalman filtering, eliminating instrument system errors, and obtaining a time-space reference; and generating a three-dimensional power flow reference data set. By fusing multi-source ocean observation data and applying space-time registration and dynamic filtering technologies, high-precision three-dimensional power flow reference data is constructed, the data coverage range and reliability are remarkably expanded, in a partial tide parameter analysis stage, a least square fitting and complex vector superposition method is adopted, elliptic motion elements of a key partial tide are accurately solved, and the maximum power flow is obtained. And the integrity of tide motion rule description is ensured.