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Spaceborne synthetic aperture radar marine scene observation radar gain setting method and system

A synthetic aperture radar and radar technology, applied in the field of microwave remote sensing, can solve the problems of improper MGC settings affecting satellite observation, and the proportion of effective data is not high

Active Publication Date: 2022-04-05
NAT SATELLITE OCEAN APPL SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for SAR ocean observation, the MGC is mainly set manually based on experience, resulting in a low proportion of valid data in SAR observation data.
[0006] Taking the Gaofen-3 satellite as an example, the satellite ocean observation gain control adopts the MGC method, and at present, the MGC mainly relies on manual experience, and there is also a problem that the satellite observation is affected by improper MGC settings.

Method used

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  • Spaceborne synthetic aperture radar marine scene observation radar gain setting method and system
  • Spaceborne synthetic aperture radar marine scene observation radar gain setting method and system
  • Spaceborne synthetic aperture radar marine scene observation radar gain setting method and system

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Effect test

Embodiment 1

[0051] A spaceborne synthetic aperture radar ocean scene observation radar gain setting method, such as figure 2 shown, including:

[0052] Step 1: Obtain the sea surface wind field forecast data in the area to be observed by the satellite from the sea surface wind field forecast product, and process the sea surface wind field forecast data in the sea area to obtain the processed sea surface wind field forecast data;

[0053] Step 2: use the processed sea surface wind field forecast data and radar system parameters as the input of the geophysical model function, and invert the sea surface backscatter coefficient at the time of spaceborne SAR observation;

[0054] Step 3: Calculate the manual gain control parameters based on the sea surface backscatter coefficient at the time of spaceborne SAR observation and the processed sea surface wind field forecast data combined with the manual gain control parameter calculation formula.

[0055] Step 1: Obtain the sea surface wind fiel...

Embodiment 2

[0095] First of all, in terms of satellite observation MGC parameter preset, the present invention adopts ocean forecasting technology and sea surface backscatter coefficient inversion technology, compared with traditional manual experience, it can quantitatively analyze and calculate MGC, and greatly improve the accuracy of parameter setting. Secondly, due to the errors of the forecast and the GMF empirical model, if the preset value of the MGC parameter is not suitable, the MGC parameter can be corrected through the MGC parameter verification step. Finally, by establishing the MGC parameter library, for radars with the same frequency band and polarization, and the observation scene where the incident angle, azimuth angle and external wind field are close, the MGC parameters can be selected by searching the database data without calculation. Therefore, the efficiency of satellite observation mission planning can be further improved.

[0096] After experimenting with Gaofen-3 ...

Embodiment 3

[0114] The present invention based on the same inventive concept also provides a spaceborne synthetic aperture radar marine scene observation radar gain setting system, including:

[0115] The data processing module is used to obtain the sea surface wind field forecast data in the area to be observed by the satellite from the sea surface wind field forecast product, and process the sea surface wind field forecast data in the sea area to obtain the processed sea surface wind field forecast data;

[0116] The scattering coefficient calculation module is used to use the processed sea surface wind field forecast data and radar system parameters as the input of the geophysical model function to invert the sea surface backscatter coefficient at the time of spaceborne SAR observation;

[0117] The manual gain control parameter calculation module is used to calculate the manual gain control parameters based on the sea surface backscatter coefficient at the time of spaceborne SAR observ...

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Abstract

The present invention provides a method and a system for setting the gain of a spaceborne synthetic aperture radar ocean scene observation radar, comprising: obtaining the sea surface wind field forecast data of the area to be observed by the satellite from the sea surface wind field forecast product, and forecasting the sea surface wind field of the sea area The data is processed to obtain the processed sea surface wind field forecast data; the processed sea surface wind field forecast data and radar system parameters are used as the input of the geophysical model function to invert the sea surface backscatter coefficient at the time of spaceborne SAR observation; Based on the backscatter coefficient of the sea surface at the time of spaceborne SAR observation and the processed sea surface wind field forecast data combined with the manual gain control parameter calculation formula to calculate the manual gain control parameters, this technical solution solves the problem of improper manual setting of radar gain parameters in the prior art. The proportion of effective observation data of ocean scenes is not high.

Description

technical field [0001] The invention relates to the field of microwave remote sensing, in particular to a method and system for setting the gain of a spaceborne synthetic aperture radar ocean scene observation radar. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave imaging radar. Radar gain is an important working parameter of radar. When SAR observes the earth, the amplitude of the echo signal received by SAR varies greatly, and its dynamic range is greater than that of the Analog to Digital Converter (ADC). In actual observation, it is necessary to set a reasonable radar gain according to the signal power of the ground object echo to ensure that the strength of the radar echo signal is within the dynamic range of the ADC. Improper setting of radar gain will lead to invalid observation data. For example, if the radar gain is set too low, the echo data will be submerged in the noise of the receiver, resulting in signal loss; if the radar ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S13/95G01S7/41
CPCG01S13/90G01S13/955G01S7/41Y02A90/10
Inventor 袁新哲韩冰王晓晨仲利华赵良波孙吉利
Owner NAT SATELLITE OCEAN APPL SERVICE