A Method for Extracting Wave Height from First-Order Bragg Resonant Peak of High Frequency Surface Wave Radar Ocean Echo

Abstract

The invention discloses a method for extracting wave height from sea echo first-order Bragg harmonic peak of a high-frequency ground wave radar. The method comprises the steps of building a response curve of the Bragg wave spectrum value based on the wave height; calibrating the first-order peak power of a long-distance unit through the wave length subjected to second-order spectrum inversion and the first-order peak powder in a near distance unit of the radar, so as to calculate the wave height distribution in the long-distance unit. The method is mainly dependent on the unsaturation feature of the Bragg wave; the wave height is extracted from the first-order Bragg resonance peak; the first-order peak under the general ocean state is obviously more than that in the second-order spectrum, so that the wave height detection distance of the high-frequency ground wave radar can be greatly improved; meanwhile, the portable radar adopting a compact receiving antenna has the space resolution for obtaining the wave height; therefore, the development, popularization and application are greatly promoted.

Description

technical field

[0001] The invention belongs to the technical field of high-frequency ground wave radar marine environment monitoring, and in particular relates to a method for extracting sea surface wave height by using the first-order Bragg resonance peak of high-frequency ocean echo. Background technique

[0002] The main mechanism of the echo spectrum formed by the backscattering of high-frequency radio waves by ocean waves is the Bragg scattering effect, and its main components are the first-order and second-order Bragg scattering resonance peaks. The first-order peak is the line spectrum, which is produced by the in-phase intensification of the Bragg waves whose wavelength is half the wavelength of the radar wave; the second-order spectrum is located on both sides of the first-order spectrum and is mainly a continuous spectrum. At present, the wind and wave retrieval methods adopted by various types of high-frequency sea-state radar products in the world are mainly bas...