Flight-crossing type sounding data profile sound velocity correction method combining historical profile sound velocity and actually measured surface sound velocity

Abstract

The invention provides a flight-crossing type sounding data profile sound velocity correction method combining historical profile sound velocity and actually measured surface sound velocity, and belongs to the technical field of marine surveying and mapping. The method comprises the steps: inputting historical water temperature, salinity and pressure data of a flight-crossing type deep sea measurement area, and calculating sound velocity profile data; carrying out vertical layering of the standardized sound velocity profile; carrying out EOF analysis on a standardized historical sound velocity profile group to obtain a reconstruction coefficient range and a feature vector; constructing a genetic algorithm to optimize a neural network model, and selecting a fitness function; inputting historical sound velocity profile data, and training the model; inputting the actually measured surface sound velocity, the position information, the depth and the feature vector into the trained model, and inverting a sound velocity profile; and carrying out sound velocity correction on the flight-crossing sounding data by adopting constant gradient sound ray tracking. According to the method, the defect that a high-precision sound velocity profile for sound velocity correction is lacked in the post-processing stage of the current flight-crossing type water depth data is overcome, the influence of sound velocity errors is weakened, and the precision of the flight-crossing type sounding data is improved.

Description

technical field [0001] The invention belongs to the technical field of marine surveying and mapping, and relates to a method for correcting sound velocity of sailing water depth data. Background technique [0002] Ferry-type water depth data refers to the water depth data in the ship track area collected and obtained by surveying ships using the sounding equipment and positioning devices carried on board. In order to promote the application of ferry-type water depth data to practical production, a series of post-processing work is required on the data, including corrections such as tide, draft, attitude, and sound velocity, so as to improve the accuracy of ferry-type water depth data. Aiming at the problem of sound velocity correction in navigational water depth data, many foreign scholars have carried out a series of related research work. [0003] Thornton pointed out the necessity of sound velocity correction for sailing water depth data by analyzing various errors in ba...

AI Technical Summary

Problems solved by technology

If you use this method to invert the sound velocity profile directly in the navigation sounding work based on the historical sound velocity profile group, you will only get the sound velocity profile in the past or average sense of the sea area, especially in the inversion of the sound velocity in the sea area with complex terrain Due to the inversion and iteration conditions of this method, the data accuracy is difficult to meet the requirements of real-time bathymetry work and measurement specifications.

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