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A Bistatic Synthetic Aperture Radar Numerical Range Doppler Imaging Method

A technology of synthetic aperture radar and numerical distance, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve problems such as two-dimensional spectrum error and inability to use motion measurement information

Active Publication Date: 2017-09-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

This obviously brings an error to the two-dimensional spectrum, and when the synthetic aperture time is lengthened, the influence of the error will be unavoidable
Again, this method cannot use motion measurement information

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  • A Bistatic Synthetic Aperture Radar Numerical Range Doppler Imaging Method

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Embodiment Construction

[0078] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0079] In order to describe content of the present invention conveniently, at first the following terms are explained:

[0080] Term 1: Bistatic SAR

[0081] Bistatic SAR refers to the SAR system in which the system transmitting station and receiving station are placed on different platforms, at least one of which is a moving platform, which is conceptually a bistatic radar, such as figure 1 shown.

[0082] Term 2: Secondary Range Compression (SRC)

[0083] As the oblique viewing angle increases, stronger distance and azimuth coupling will be introduced, and filtering is required to correct the defocus caused by the coupling. This process is called secondary distance compression.

[0084] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified c...

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Abstract

The invention discloses a bistatic synthetic aperture radar numerical range Doppler imaging method, comprising the following steps: S1, data preprocessing; S2, performing distance compression on echo data; S3, using a numerical method to calculate a range migration correction function , and use the distance migration correction function to perform distance migration correction on the echo data; S4, generate a secondary distance compression function and perform secondary distance compression on the echo data after the distance migration correction; S5, calculate each range gate The corresponding position of the reference target point; S6. Using the position of the reference target point to construct an azimuth compression function, and perform azimuth compression to obtain an imaging result. The present invention has the advantages of: using a numerical method to obtain an accurate distance migration function, and then using the accurate distance migration function to perform distance migration correction on the echo data; at the same time, a certain degree of motion compensation is performed on the echo data; Accurate range migration correction for RD imaging method in base SAR.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a bistatic synthetic aperture radar numerical range Doppler imaging method. Background technique [0002] SAR is an all-day, all-weather modern high-resolution microwave remote sensing imaging radar. SAR has played an increasingly important role in military reconnaissance, topographic mapping, vegetation analysis, ocean and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of crustal changes. [0003] Bistatic SAR has many outstanding advantages due to the separation of transceivers. It can obtain the non-backscatter information of the target, and has the characteristics of long range, concealment and strong anti-interference. In addition, since the bistatic SAR receiving station does not contain high-power devices, it has low power consumption, small size, and light weight, making it easy to carry on various typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/904G01S13/9058
Inventor 武俊杰钟徐琦杨建宇黄钰林杨海光杨晓波孔令讲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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