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Pulse system radar sea ice detection capability assessment method

A technology with detection ability and system, applied in the marine field, can solve problems such as lack of quantitative theory of sea ice

Active Publication Date: 2017-08-18
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
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Problems solved by technology

At present, there is still a lack of quantitative theoretical research on the detection capability of sea ice. We proposed a pulse system radar sea ice detection capability evaluation model and invented a pulse system radar sea ice detection capability evaluation method.

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  • Pulse system radar sea ice detection capability assessment method
  • Pulse system radar sea ice detection capability assessment method
  • Pulse system radar sea ice detection capability assessment method

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] A method for evaluating sea ice detection capability of a pulse system radar, comprising the following steps:

[0042] Step 1: If figure 1 As shown, media 1, 2, and 3 are air, sea ice, and sea water, respectively, and their permittivity, magnetic permeability, and electrical conductivity are (ε 1 ,μ 1 ,σ 1 ), (ε 2 ,μ 2 ,σ 2 ), (ε 3 ,μ 3 ,σ 3 ); Generally speaking, except for ferromagnetic media, the magnetic permeability is approximately equal to the magnetic permeability in vacuum, that is, μ 1 =μ 2 =μ 3 =μ 0 . In the air ε 1 =ε 0 , σ 1 =0, where the magnetic permeability in vacuum μ 0 =4π×10 -7 Heng / meter (H / m), dielectric constant ε 0 =8.85419×10 -12 (F / m), sea ice conductivity is σ 2 =ωε″ε 0 , where the angular frequency of the electromagnetic wave is ω=2πf, and f is the frequency of the electromagnetic wave. T...

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Abstract

The present invention discloses a pulse system radar sea ice detection capability assessment method. About a pulse system radar, the pulse signal width of the pulse system radar is [Tau], the electromagnetic wave propagation speed of the pulse system radar is c0, and the detectable sea ice thickness limited by pulse width is (img file='DDA0001266953770000011. TIF' wi='349' he='93' / ), wherein c0=3*108m / sec, and [Theta]2 is an electromagnetic wave transmission angle in sea ice. The sea ice identification resolution is expressed by Dice, the physical significance is the discriminating degree of a sea ice area and a seawater area in a radar scattering image, and the sea ice identification resolutions when horizontal polarization and vertical polarization are (img file='DDA0001266953770000012. TIF' wi='484' he='109' / ) and (img file='DDA0001266953770000013. TIF' wi='485' he='111' / ). Based on the sea ice dielectric constant model, the pulse system radar sea ice detection capability assessment method considers multi-time scattering of electromagnetic waves between an air-ice interface and a sea water-sea ice interface, and the assessment factors are sea ice detection thickness and the sea ice identification resolution.

Description

technical field [0001] The invention belongs to the technical field of marine technology, and in particular relates to a method for simulating the detectable thickness of sea ice and the recognition degree of sea ice. Background technique [0002] Since the 1980s, due to global warming, the melting of sea ice has accelerated, and the impact of Arctic sea ice on the global climate has been amplified. The use of space-based and space-based radars to detect polar sea ice has important scientific significance and applications value. [0003] Synthetic Aperture Radar (abbreviated as SAR) has the advantages of all-weather and cloud penetration. Since its first launch in 1978, it has been applied to earth observation, especially ocean observation, including sea surface wind field, wave parameter extraction, ocean current Frontal detection, sea surface oil spill, maritime target recognition, sea ice movement and classification and other application fields. The change of sea surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/4052G01S13/90G01S13/9027G01S13/9076
Inventor 谢涛何宜军
Owner NANJING UNIV OF INFORMATION SCI & TECH
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