Method of remote sensing of ocean surface currents
First Claim
Patent Images
1. A method of remote sensing of a water surface with increased signal to noise ratio and reduced dwell time, comprising the steps of:
- illuminating a section of water surface with a first laser radiation source having a first frequency;
illuminating the section of water surface with a second laser radiation source having a second frequency distinct from the first frequency;
collecting laser radiation from the first and second laser sources scattered from the section of water surface, the scattered radiation including first and second-frequency components;
multiplying the first and second frequency components of the scattered radiation to obtain a product having a low frequency component;
determining the power spectrum of the low frequency component of the product, said power spectrum having a resonant peak at a frequency of the surface waves present on the section of water surface; and
determining an amplitude and a frequency of the resonance peak to determine a surface gravity wave spectrum and a surface current along a look direction at the first and second radiation sources.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of remote sensing of water surfaces using laser beams of slightly differing frequencies. Laser radiation scattered from the water surface is collected and processed to determine the surface gravity wave and capillary wave spectrum and surface currents. Maps may be constructed using either land-based or airborne .increment.k-lidar stations.
21 Citations
10 Claims
-
1. A method of remote sensing of a water surface with increased signal to noise ratio and reduced dwell time, comprising the steps of:
-
illuminating a section of water surface with a first laser radiation source having a first frequency; illuminating the section of water surface with a second laser radiation source having a second frequency distinct from the first frequency; collecting laser radiation from the first and second laser sources scattered from the section of water surface, the scattered radiation including first and second-frequency components; multiplying the first and second frequency components of the scattered radiation to obtain a product having a low frequency component; determining the power spectrum of the low frequency component of the product, said power spectrum having a resonant peak at a frequency of the surface waves present on the section of water surface; and determining an amplitude and a frequency of the resonance peak to determine a surface gravity wave spectrum and a surface current along a look direction at the first and second radiation sources. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification