Ship length calculation method based on observation data of microwave scatterometer

A technology of microwave scatterometer and observation data, applied in the field of microwave remote sensing, can solve the problem of low calculation accuracy

Active Publication Date: 2019-07-26
NAT SPACE SCI CENT CAS
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcoming of the low calculation...

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  • Ship length calculation method based on observation data of microwave scatterometer
  • Ship length calculation method based on observation data of microwave scatterometer
  • Ship length calculation method based on observation data of microwave scatterometer

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Embodiment 1

[0088] Such as figure 2 As shown, the microwave scatterometer of the present invention is a fan-shaped beam conical scanning microwave scatterometer, for example, through the large incident angle (40°~60°) of the fan-shaped beam on the low-orbit remote sensing satellite (height 500km), it can realize the detection of large swath width (saw The observation geometry of swath > 2000km) realizes the detection of all targets within the swath range through fan-shaped beam conical scanning.

[0089] Such as image 3 As shown, the microwave scatterometer echo signal is down-converted and low-pass filtered, then processed by the ring scan SAR, adaptive two-dimensional detection, and the ship target is detected;

[0090] After the scatterometer system detects a variety of ship targets, it first eliminates land and islands, retains ocean targets, and then confirms the targets to determine whether they are the same target, and then divides all targets.

[0091] Each ship target is obse...

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Abstract

The invention proposes a ship length calculation method based on observation data of a microwave scatterometer. The method comprises the following steps of performing cone scanning on a ship target bythe microwave scatterometer through a fan-shaped beam, and obtaining a plurality of groups of observation data of the ship target; calculating an included angle between a ship and the movement direction of a satellite according to the time delay, different observation azimuth angles and the Doppler frequency in the observation data; calculating the projection length of the ship in an echo direction according to a ship one-dimensional range profile on a certain observation azimuth angle in the observation data; and calculating the length of the ship according to the included angle between theship and the movement direction of the satellite and the projection length of the ship in the echo direction. According to the ship length calculation method based on the observation data of the microwave scatterometer provided by the invention, the sea surface detection range can be expanded by adopting the fan-shaped beam; the range resolution can be improved by using a broadband signal, and theazimuth resolution can be improved by using a circular scanning technology; and by at least four times of observation on the detected same target, the movement direction of the ship can be accuratelycalculated, and high-precision calculation on the ship length is realized.

Description

technical field [0001] The invention belongs to the field of microwave remote sensing, and in particular relates to a ship length calculation method based on microwave scatterometer observation data, and is especially suitable for the tasks of ship remote sensing detection and monitoring. Background technique [0002] Ship detection and surveillance is a traditional task of all coastal countries in the world, and has a wide range of applications in the military and people's livelihood departments. Since 2000, the United States, the European Union and China have carried out a series of ship remote sensing research work. The main technologies include constant false alarm detection algorithm, template matching algorithm, wavelet analysis algorithm, etc. These algorithms can be used for ships within a large swath range. The detection ability can realize the detection of ship targets, but it is difficult to obtain accurate ship length information, and it is impossible to provide ...

Claims

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Application Information

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IPC IPC(8): G01B15/00G01S13/88
CPCG01B15/00G01S13/88
Inventor 马剑英朱迪
Owner NAT SPACE SCI CENT CAS
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