Method for inverting wave height by using small-aperture high-frequency radar ocean echo

Abstract

The invention provides a method for inverting a wave height by using small-aperture high-frequency radar ocean echoes. The method comprises the following steps: acquiring a wide-beam echo Doppler spectrum of a distance ring to be measured; extracting the first-order spectrum of the wide beam with the maximum amplitude and the second-order spectrum of the outer side of the wide beam near the first-order spectrum, and calculating the energy ratio of the two; calculating the wave vector amplitude under the condition of ocean current, and further obtaining an inversion coefficient vector in combination with radar system parameters; an inversion coefficient vector corresponding to each Doppler angular frequency is obtained through repeated calculation, all the inversion coefficient vectors are combined to obtain an inversion coefficient matrix, the pseudo-inverse of the inversion coefficient matrix is solved through singular value decomposition, and an undirected sea wave spectrum is obtained through inversion; and the undirected sea wave spectrum is integrated to obtain the effective wave height. The method has the advantages that the method is not sensitive to ocean current influence, the undirected wave spectrum can be accurately inverted from the wide-beam echo Doppler spectrum, the accuracy of wave height parameter estimation is improved, and the method is suitable for a high-frequency radar with a small aperture, is convenient to use and has development and application prospects.

Description

technical field [0001] The invention belongs to the field of high-frequency radar ocean remote sensing, and in particular relates to a method for inverting wave height by using small-aperture high-frequency radar ocean echoes. Background technique [0002] High-frequency radar realizes the monitoring of marine environmental parameters by emitting high-frequency vertically polarized electromagnetic waves with a frequency of 3-30 MHz that can be diffracted and propagated along the ocean surface. Compared with traditional on-site measurement equipment (such as buoys, ADCP), in detecting ocean parameters such as wind, waves, and currents, high-frequency radar has a large measurement coverage area, over-the-horizon, non-contact measurement, and can continuously and real-time monitor the ocean. Surface parameters and other advantages, suitable for long-term, large-scale monitoring of marine environmental parameters. At present, the technology of detecting ocean current parameters...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that it is difficult to invert the ocean wave information from the wide-beam radar echo Doppler spectrum due to the influence of ocean currents, and the accuracy of extracting ocean wave parameters is not high. wave height method

Images