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Method for spectral estimation of the clutter of a haline liquid medium

A liquid medium and spectrum estimation technology, applied in the direction of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve problems such as signals that do not introduce clutter

Inactive Publication Date: 2018-08-31
SUEZ GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the document does not describe signals from clutter in saline liquid (i.e. liquids with non-zero salinity) media such as lakes, rivers, seas or oceans

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  • Method for spectral estimation of the clutter of a haline liquid medium
  • Method for spectral estimation of the clutter of a haline liquid medium
  • Method for spectral estimation of the clutter of a haline liquid medium

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Embodiment Construction

[0045] In this embodiment, the Doppler coastal marine radar operates in the HF or VHF electromagnetic band, ie between 5 MHz and 50 MHz.

[0046] The present invention consists in applying a method called direction of arrival in beam space or beamspace (referring to beam space) DOA (acronym for Direction Of Arrival) search, combined with a solution of source energy estimation to obtain sea clutter The distribution of the energy spectral density of a wave in a direction.

[0047] In this paper, the term "beamspace" is translated as "beam space", and refers to the space formed by a set of signals generated by a subset of receivers of a multi-receiver radar system, the information content of the beam space is limited to the azimuth (360°) part of the corner space.

[0048] The term "beamforming" translates to "beamforming" and refers to the filtering of signals received by multiple receivers by applying phase shifting and weighting at each receiver, with the aim of preserving on...

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Abstract

The invention relates to a method for spectral estimation of the clutter of a haline liquid medium received by an oceanographic radar, such as a lake, a river, a sea or an ocean, from an array of antennas including at least three antennas. The method includes the following steps: a first step (101) of forming at least two sub-arrays of antennas from the array of antennas, each of the sub-arrays including at least one antenna less than the array of antennas; a second step (102) of calculating a beam in one direction for each sub-array of antennas; a third step (103) of locating in azimuth all the sources comprised in the beam from data of the beam coming from each of the sub-arrays; a fourth step (104) of estimating the energy of each of the located sources; and a fifth step (105) of selecting a source, referred to as preferred source, among a plurality of sources according to a predetermined criterion when the beam includes a plurality of sources.

Description

technical field [0001] The present invention relates to a method for spectrum estimation of clutter in a saline liquid (ie liquid with non-zero salinity) medium (eg lake, river, sea or ocean). This method is especially suitable for coastal ocean radar observations, and also for lakes and rivers. [0002] Spectral estimation is a technique for estimating the power spectral density of a signal. [0003] The present invention more specifically relates to a radar signal processing technique applied to sea clutter, wherein the sea clutter is received by a Doppler coastal ocean radar to an antenna array, wherein the antenna array works in the electromagnetic band HF or VHF (HF corresponds to High Frequency, VHF corresponds to Ultra High Frequency), i.e. between 3 MHz and 300 MHz. [0004] In this document, the term "sea clutter" refers to the processed portion of the radar signal resulting from backscattering of the radar signal from the surface Saline liquid media are, for examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/02G01S7/41G01S13/42
CPCG01S7/41G01S13/0218G01S13/42G01S13/58G01S13/89G01S13/95Y02A90/10G01S7/2813G01S13/449G01S13/48
Inventor 吉约姆·西科尼古拉·托马
Owner SUEZ GRP