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Bistatic synthetic aperture radar numerical range Doppler imaging method

A synthetic aperture radar, numerical distance technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve problems such as inability to use motion measurement information, two-dimensional spectral errors, etc.

Active Publication Date: 2016-04-13
UNIV OF ELECTRONIC 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

Method used

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  • Bistatic synthetic aperture radar numerical range Doppler imaging method
  • Bistatic synthetic aperture radar numerical range Doppler imaging method
  • Bistatic synthetic aperture radar numerical range Doppler imaging method

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Embodiment Construction

[0075] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0076] In order to describe content of the present invention conveniently, at first the following terms are explained:

[0077] Term 1: Bistatic SAR

[0078] 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.

[0079] Term 2: Secondary Range Compression (SRC)

[0080] 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.

[0081] 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, which comprises the following steps: S1) carrying out data pre-processing; S2) carrying out range compression on echo data; S3) calculating a range migration correction function through a numerical method, and carrying out range migration correction on the echo data by utilizing the range migration correction function; S4) generating a secondary range compression function and carrying out secondary range compression on the echo data obtained after range migration correction; S5) calculating reference target point position corresponding to each range gate; and S6) constructing an azimuth compression function by utilizing the reference target point position and carrying out azimuth compression to obtain an imaging result. The advantages of the method are that the accurate range migration function is obtained through the numerical method, and then, range migration correction is carried out on the echo data by utilizing the accurate range migration function; and meanwhile, a certain degree of motion compensation is carried out on the echo data, and thus accurate range migration correction based on the bistatic SAR RD imaging method is realized.

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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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 ELECTRONIC SCI & TECH OF CHINA
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