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A high-precision full-link spaceborne SAR radiation calibration simulation method

A technology of radiation calibration and simulation method, which is applied in the field of high-precision full-link spaceborne SAR radiation calibration simulation, can solve the problems of high experimental cost and difficulty, achieve strong versatility, complete simulation process, and solve experimental cost high effect

Active Publication Date: 2021-10-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem of high cost and difficulty in completing the calibration radiation experiment by setting the calibration angle reflector in the calibration field

Method used

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  • A high-precision full-link spaceborne SAR radiation calibration simulation method
  • A high-precision full-link spaceborne SAR radiation calibration simulation method
  • A high-precision full-link spaceborne SAR radiation calibration simulation method

Examples

Experimental program
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Embodiment 1

[0092] like figure 1 As shown, a high-precision full-link spaceborne SAR radiation calibration simulation method provided by an embodiment of the present invention includes the following steps:

[0093] S1. Read in the real radar satellite data: read in the real radar satellite data of the scene that meets the requirements of the calibration field.

[0094] This step selects the real radar satellite image product. Preferably, the scene read in step S1 should be uniformly distributed in a large enough range, and the backscattering intensity is weak, not exceeding the threshold, so that after the scaler is deployed, To meet the requirements of high signal-to-noise ratio, that is, the selected scene should meet the requirements of the general calibration field, and the scaler can be actually installed.

[0095] S2. Selecting a simulation data source: According to the radar satellite data read in in step S1, a surface target with the required number of points in the range directi...

Embodiment 2

[0165] like Figure 2-Figure 11 As shown, the second embodiment is basically the same as the first embodiment, and the similarities will not be repeated. The difference lies in:

[0166] This embodiment selects the standard strip mode radar image product of the Amazon tropical rainforest imaged by Gaofen No. 3 radar satellite, such as figure 2 shown. Select a surface object with 512 points in both the range direction and the azimuth direction as the calibration simulation data source, such as image 3 shown. The starting position of the target azimuth of this surface is 2300, and the starting position of the range is 6500. The RCS in the calibration simulation area approximates a Gaussian distribution, and the histogram is as follows Figure 4 shown. The average value of RCS in the calibration simulation area is -17.33dB.

[0167] Table 1 Echo simulation parameters

[0168]

[0169] By adding a scaler with a known radar cross-sectional area at the center of the scen...

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Abstract

The invention relates to a high-precision full-link spaceborne SAR radiation calibration simulation method, comprising: reading in real radar satellite data; selecting a surface target whose size of points in the range direction and azimuth direction meets the requirements as a radiation calibration simulation data source; By adding a scaler with a known radar cross-sectional area at the center of the scene, construct the area target simulation data source for deploying the scaler; decompose the area target for deploying the scaler into multiple point targets, and calculate each point The echoes of the target are superimposed to obtain the echo simulation signal; the imaging process is performed to obtain the scene radar image including the scaler; the radiation calibration coefficient is calculated to complete the calibration process. The method provided by the invention uses the real radar satellite data to simulate the echo of the calibration field, solves the problem of high experimental cost of the real deployment calibration device, and realizes the radiation calibration simulation of the full link of the spaceborne SAR.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a high-precision full-link spaceborne SAR radiation calibration simulation method. Background technique [0002] Since its appearance in the 1950s, after nearly 70 years of development, Synthetic Aperture Radar (SAR) technology has entered a relatively mature stage and has been used in geology, hydrology, agriculture, forestry, cities, It is widely used in marine, surveying and mapping, and military reconnaissance. Early SAR applications mainly obtained target information such as position, shape, graphics, texture and contrast through radar images, which is a qualitative application technology. With the development of the new generation of spaceborne SAR, the correlation technology of the calibrated SAR image is gradually mature, and the radiation quality of the SAR image is gradually improved, which can be directly related to the target radar cross-sectional area or s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
CPCG01S7/4052
Inventor 陈杰章瑞杨威
Owner BEIHANG UNIV
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