Absolute calibration method for satellite radar altimeter without special calibration field

Abstract

The invention relates to an absolute calibration method for a satellite radar altimeter without a special calibration field and belongs to the technical field of calibration of satellite altimeters. According to the method, an absolute deviation of the satellite radar altimeter can be determined through processing tidal observation data and satellite altimetry data of a satisfactory oceanographic station, adding essential correction entries such as a geoid model, carrying out height datum unification, altimetry data space position interpolation and tidal observation data time interpolation, and finally, carrying out difference comparison on sea surface height of tidal observation and sea surface height of the satellite radar altimeter. Compared with the prior art, the method has the advantages that the special calibration field is not required, the existing oceanographic stations can have calibration capability by using existing business observation data of oceanographic stations of coasts or oceanic islands of our country and a regional accurate geoid, and thus, absolute measured deviations of the satellite altimeters at home and abroad can be acquired.

Description

technical field [0001] The invention relates to an absolute calibration method for a satellite radar altimeter without a special calibration field, and belongs to the technical field of altimeter calibration. Background technique [0002] The currently known satellite radar altimeter is absolutely calibrated by a special calibration field built abroad. "Absolute calibration" is to determine the absolute deviation of the sea surface height measurement of the satellite radar altimeter. Usually, the special calibration field is located on a fixed location on the coast, Install complete calibration equipment on the seabed or offshore platforms to carry out long-term synchronous sea surface height observations. The use of this kind of calibration field needs to design the orbit of the satellite radar altimeter in advance so that it passes through the location of the calibration field. At the same time, the special calibration field needs to invest a lot of money in the station co...

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Problems solved by technology

However, my country has launched the "Ocean II" satellite radar altimeter in 2011. There is an urgent need for absolute calibration of the satellite radar altimeter. Domestic researchers have only carried out sporadic and non-continuous experimental calibration. There is still a large gap in the continuous satellite calibration, which has greatly restricted the data application of my country's "Ocean-2"

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