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Ocean surface wind and wave feature retrieval method based on echo of spaceborne laser height indicator

A technology of laser altimeter and altimeter, which is applied in the field of wave characteristic inversion and ocean surface wind, and achieves the effects of strong versatility and anti-interference, high positioning accuracy and spatial resolution

Inactive Publication Date: 2012-10-31
WUHAN UNIV
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Problems solved by technology

Since the GLAS system is mainly used for the measurement of ice sheets in polar regions (mainly the North and South Poles), there are few reports on the analysis of ocean surface characteristics and the inversion of ocean surface wind speed from echo patterns.

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  • Ocean surface wind and wave feature retrieval method based on echo of spaceborne laser height indicator
  • Ocean surface wind and wave feature retrieval method based on echo of spaceborne laser height indicator
  • Ocean surface wind and wave feature retrieval method based on echo of spaceborne laser height indicator

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Embodiment

[0039] At first introduce the required theoretical basis of the present invention:

[0040] 1. Theoretical derivation of the relationship between echo pulse width and sea surface wind speed and wave slope

[0041] According to Gardner's theory, the emitted laser pulse undergoes a Fresnel diffraction, is incident on the surface of the earth, is reflected by the target, and then passes through a Fresnel diffraction to reach the field of view of the receiving telescope. The echo power received by the telescope is expressed by (1), In the formula, ρ is the cross-sectional coordinate vector of the reflective target, β(ρ) is the reflectivity of the target in the spot, ξ(ρ) is the elevation profile of the target surface, and A R is the area of ​​the receiving telescope, z is the altitude of the altimeter orbit, c is the speed of light in vacuum, Σ is the area illuminated by the target spot, a(ρ,z) and f(t) are the distribution functions of the laser pulse in the air domain and time d...

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Abstract

The invention relates to an ocean surface wind and wave feature retrieval method based on an echo of a spaceborne laser height indicator. The method comprises the steps of preprocessing and extracting the features of echo waveform of the spaceborne laser height indicator, and then establishing a mathematic relation between the extracted echo waveform and the ocean surface wind field and wave field, thus calculating the slope and the height of the ocean surface wave and the wind speed of ocean surface through a retrieval way according to the echo parameters. On the basis that laser beam has the characteristics that the divergence angle is far less than that of a microwave beam, the method for inverting the ocean surface wind speed under the echo pulse width by adopting the spaceborne laser height indicator has foot positioning precision and space resolution ratio higher than those of currently commonly used method for inverting the wind speed through the scattering section of a radar of a microwave radar height indicator.

Description

technical field [0001] The invention relates to an ocean surface wind and wave characteristic inversion method, in particular to an ocean surface wind and wave characteristic inversion method based on the echo of a space-borne laser altimeter. Background technique [0002] The wave slope of the ocean surface is an important sea state parameter, and the wave slope is also related to the wind field strength above the sea. At present, the remote sensing measurement of the ocean surface wave slope is mainly carried out by airborne or spaceborne microwave radar: the target scattering cross-section is calculated according to the radar reflection echo, and the mean square slope (MSS, mean square slope) of the sea surface is inverted from this, and then the wind wave model Calculate the wind speed above sea level. The space-borne laser altimeter is a low-orbit satellite platform that emits laser pulses and receives the weak echoes of the laser pulses reflected by ground objects. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48
Inventor 李松马跃周辉郑国兴葛兵
Owner WUHAN UNIV
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