Method for acquiring and imaging data of compressive sensing synthetic aperture radar

A synthetic aperture radar and compressive sensing technology, applied in the field of signal processing, can solve the problems of reducing the amount of radar storage and transmission data, and the inability of compressed sensing pulse compression to perform conventional distance migration correction, so as to solve interpolation calculation, reduce storage and transmission. The effect of data volume

Inactive Publication Date: 2011-09-14
BEIHANG UNIV
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Problems solved by technology

[0010] The purpose of the present invention is to solve the above problems, propose a Chirp Scaling principle based on (Chirp Scaling principle see R.Bamler.A Systematic Comparison of SAR Focusing Algorithms.In Proc.Int.Geoscience and Remote Sensing Symp., IGARSS'91 , Vol.2, pp.1005-1009, Espoo, Finland, June1991.) compressed sensing synthetic aperture radar data acquisition and imaging method, for special observation scenarios, this method can greatly reduce the amount of data stored and transmitted by the radar, effectively It solves the problem that compressed sensing pulse compression cannot perform conventional distance migration correction

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  • Method for acquiring and imaging data of compressive sensing synthetic aperture radar
  • Method for acquiring and imaging data of compressive sensing synthetic aperture radar
  • Method for acquiring and imaging data of compressive sensing synthetic aperture radar

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Embodiment

[0078] Example: A compressed sensing synthetic aperture radar data acquisition and imaging method, comprising the following steps:

[0079] Step 1: Select the observation scene;

[0080] The observation scene needs to meet the following conditions: in the final imaging result, the sum of pixels of strong scatterers is less than 1 / 10 of the total number of pixels in the entire image, and the intensity of background scatter points is at least 1 / 10 lower than the average intensity of strong scatter points. are scattered ships on the sea;

[0081] Step 2: Radar antenna emits Chirp signal

[0082] The emission form of the radar antenna to the observation scene is Chirp(t)=exp{jπKt 2}-type chirp signal, where |t|≤τ p / 2, t is the pulse time, K is the modulation frequency, τ p is the pulse width.

[0083] Step 3: SAR range signal reception;

[0084] When the synthetic aperture radar acquires data, it does not need to perform traditional high-frequency uniform data acquisition...

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Abstract

The invention provides a method for acquiring and imaging data of compressive sensing synthetic aperture radar. The method comprises the following steps of: 1, selecting an observation scene; 2, emitting a Chirp signal by a radar antenna; 3, receiving a distance direction signal of the synthetic aperture radar; 4, constructing a compressive sensing restoring matrix; 5, correcting distance compression and distance migration; 6, constructing an orientation direction filter matrix; and 7, compressing towards the orientation direction. By the method for acquiring and imaging the data, aiming at realizing great reduction of radar stored and transmitted data quantity in the special observation scene and synchronously realizing restoring of a distance direction pulse compression signal and correction of the distance migration, the problem that interpolation calculation cannot be performed on a compressive sensing restoring signal is solved.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a compressed sensing synthetic aperture radar data acquisition and imaging method. Background technique [0002] In 1951, Wiley first discovered that side-looking radar could improve azimuth resolution by exploiting the Doppler shift in the echo signal. This landmark discovery marked the beginning of what is now known as synthetic aperture radar (SAR). The birth of technology. In the following years, a series of research work has been carried out, which has led to a steady increase in the performance of both the sensor and the signal processing. While most of the early work was aimed at military applications such as detecting and tracking moving targets, the potential of the device as an imaging sensor in scientific applications was widely recognized. [0003] Before the advent of imaging radar, the vast majority of high-resolution sensors had a camera sys...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 肖鹏李春升于泽
Owner BEIHANG UNIV
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