Surface flow measurement method based on monostation shipborne high-frequency ground wave radar

Abstract

The invention provides a surface flow measurement method based on a monostation shipborne high-frequency ground wave radar, belonging to the space-time processing field of shipborne high-frequency ground wave over-the-horizon radar signals and the ocean surface flow remote sensing field. The surface flow measurement method solves the problems of difficult synchronizing detection, small remote sensing field, high measurement cost and low observation efficiency of the traditional shore-based high-frequency ground wave radar which measures the surface flow vector field by using a two-station measurement scheme. A sea area to be measured is divided into a plurality of sector grids, and each grid is a detection unit; the position of actually measured positive / negative first-order Bragg spectral peak on each detection unit is obtained by a time-space joint spectrum estimation method and through spectrum search, and a radial flow velocity on the corresponding detection unit is obtained so that the radial flow field distribution of the measured sea area can be obtained; the optimal surface flow vector field on each unit is obtained by the least square method; the optimal surface flow vector fields which are measured in the same detection unit at a plurality of measurement moments are weighted and averaged so that the surface flow vector field of the measured sea area can be obtained. The surface flow measurement method based on the monostation shipborne high-frequency ground wave radar is specifically used for measuring the ocean surface flow.

Description

technical field [0001] The invention belongs to the field of space-time processing of ship-borne high-frequency ground wave over-the-horizon radar signals and the field of ocean surface flow remote sensing. Background technique [0002] High-frequency ground wave (surface wave) radar utilizes vertically polarized high-frequency electromagnetic waves to propagate on the surface of seawater, which has the characteristics of small propagation attenuation and good diffraction characteristics, and can provide good detection means for over-the-horizon target detection and ocean dynamic process telemetry . Compared with traditional marine monitoring methods, high-frequency ground wave radar has the advantages of long operating distance, wide coverage, high detection accuracy, good real-time performance, and all-weather service. It has broad application prospects in scientific research and other aspects. [0003] Theoretically, the positive and negative first-order Bragg peaks of ...

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Problems solved by technology

[0005] The present invention aims to solve the problems of difficult synchronous detection, small remote sensing area, high measurement cost and low observation efficiency in the traditional shore-based high-frequency ground wave radar using a two-station measurement scheme to measure the surface flow vector field. Surface flow measurement method based on single-station shipborne high-frequency ground wave radar

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