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WNLCS imaging method facing satellite-borne geographic reference strip SAR

A geographical and space-borne technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., to facilitate azimuth signal focusing processing and eliminate azimuth dependence

Inactive Publication Date: 2017-08-29
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is still no imaging processing method that can achieve efficient and accurate imaging processing for the echo data of spaceborne geo-referenced strip SAR

Method used

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  • WNLCS imaging method facing satellite-borne geographic reference strip SAR
  • WNLCS imaging method facing satellite-borne geographic reference strip SAR
  • WNLCS imaging method facing satellite-borne geographic reference strip SAR

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Embodiment

[0131] In the embodiment of the present invention, it is assumed that the size of the satellite-borne geographic reference strip SAR observation area is 40km × 50km (distance × azimuth), and 25 objects to be observed are evenly distributed in this area, such as Figure 6 shown. The main performance parameters, system parameters and space parameters of the simulation experiment are shown in Table 1.

[0132] Table 1. List of simulation parameters of spaceborne georeferenced strip SAR

[0133]

[0134] Step 1, based on the parameters in Table 1, Figure 6 In the simulated target distribution and the target echo expression shown in formula (4), carry out the simulation of the satellite-borne geographic reference strip SAR echo data, and obtain the scene echo data E s . Calculate the range quadratic phase compensation filter F according to the parameters in Table 1 and formula (6) RC , for the echo data E s Carry out Fourier transform in azimuth to get the distance spectru...

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Abstract

The invention discloses a wide nonlinear chirp scaling imaging processing method (wide nonlinear chirp scaling, WNLCS) suitable for a satellite-borne geographic reference strip synthetic aperture radar (synthetic aperture radar, SAR). The WNLCS method mainly comprises six steps of step1, range-direction secondary phase compensation; step2, nonlinear uniform distance migration correction and range-direction signal compression; step3, residual distance migration correction based on a time-domain interpolation; step4, azimuth frequency disturbance processing; step5, azimuth secondary phase compensation and azimuth signal compression; and step6, focusing-image geometric correction. The WNLCS imaging processing method provided in the invention possesses a data processing capability of a full aperture and a data redundancy is low. The method is a high-efficient and accurate imaging processing method suitable for an earth observation demand of the satellite-borne geographic reference strip SAR.

Description

technical field [0001] The present invention relates to the technical field of synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR), specifically, refers to a kind of Wide Nonlinear Chirp Scaling (WNLCS for short) applicable to space-borne geographic reference strip SAR Image processing method. Background technique [0002] Spaceborne SAR is an all-weather and all-time microwave imaging tool, which is suitable for surface monitoring under complex meteorological conditions. Traditional space-borne SAR usually works in near-polar orbits, so that the satellites have the ability to observe high-latitude regions. Since traditional spaceborne SARs do not have continuous range beam scanning capabilities, their surface beam coverage areas are approximately extended along the "south-north" direction. However, for specific surface observation applications, such as seismic fault zone monitoring, there may be a large angle between the strike of the target observatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9041
Inventor 王岩杨健李景文孙兵
Owner TSINGHUA UNIV
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