WO2017007095A1 - Procédé de calcul de vitesse efficace pour traitement de signal radar à synthèse d'ouverture (sar) - Google Patents

Procédé de calcul de vitesse efficace pour traitement de signal radar à synthèse d'ouverture (sar) Download PDF

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Publication number
WO2017007095A1
WO2017007095A1 PCT/KR2015/014388 KR2015014388W WO2017007095A1 WO 2017007095 A1 WO2017007095 A1 WO 2017007095A1 KR 2015014388 W KR2015014388 W KR 2015014388W WO 2017007095 A1 WO2017007095 A1 WO 2017007095A1
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WO
WIPO (PCT)
Prior art keywords
equation
signal processing
calculating
satellite image
radar signal
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PCT/KR2015/014388
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English (en)
Korean (ko)
Inventor
김동현
임병균
윤재철
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한국항공우주연구원
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Publication of WO2017007095A1 publication Critical patent/WO2017007095A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
    • G01S13/9004—SAR image acquisition techniques
    • G01S13/9019—Auto-focussing of the SAR signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques

Definitions

  • the present invention relates to a method for calculating an effective speed for satellite image radar signal processing. More specifically, the equation for the Pythagorean theorem range of the distance between two fuselages is transformed into a partial derivative with respect to azimuth time. In addition, the present invention relates to a method of calculating an effective velocity for satellite image radar signal processing that can obtain an effective velocity with a small amount of calculation by applying a method of establishing and solving simultaneous equations for two different observation times with a modified equation.
  • a SAR (Synthetic Aperture Radar) system is composed of Payload Hardware that directly performs observation of an object and SAR Processing Software that images acquired data through a synthesis process.
  • SAR signal processing through software compensates the phase history of raw data formed by hardware parameters and geometric distance information between sensor and object using various algorithms.
  • the key parameters it uses are Effective Velocity and Closed Approach.
  • V s Platform Speed
  • V g Ground Beam Speed
  • Such an approximate effect rate calculation method has a problem in that it is impossible to obtain a clear and correct high resolution SAR image.
  • the present invention transforms the equation for the range of Pythagorean theorem into a partial differential equation for azimuth time, and solves by solving simultaneous equations for two different observation times. It is an object of the present invention to provide a method for calculating an effective velocity for satellite image radar signal processing that can obtain an effective velocity with a small amount of calculation by applying a method.
  • an effect velocity calculation method for satellite image radar signal processing comprises the steps of: (a) establishing a Pythagorean theorem for calculating a range using an effective velocity; (b) converting the Pythagorean theorem into partial differential equations to partial differential equations; (c) substituting arbitrary bearing times ta1 and ta2 into the partial differential equations to establish equations for the bearing times ta1 and ta2, respectively; (d) establishing an effect rate (V e ) equation by combining two equations for ta1 and ta2; (e) calculating ⁇ R ⁇ which is a parameter of the effect velocity V e equation; And (f) calculating the effect velocity by substituting the parameter 'R' into the effect velocity equation (V e ).
  • the effect velocity calculation method for satellite image radar signal processing according to the present invention is transformed into a partial differential equation for azimuth time in order to calculate the effective velocity. Since we apply the method of setting and solving simultaneous equations for two different observation times, we can find the effective velocity very accurately with a small amount of computation.
  • FIG. 1 is a diagram of a geometric model between a target and a platform for explaining a method for calculating an effect speed for processing satellite image radar signals according to the present invention
  • FIG. 2 is a flowchart according to a method of calculating an effect speed for satellite image radar signal processing
  • Figure 3 is a comparison diagram of the target when focusing with a V e calculated according to the focusing target with the present invention when using a V e calculated in a conventional manner.
  • FIG. 1 is a diagram of a geometric model between a target and a platform for explaining a method for calculating an effect speed for satellite image radar signal processing according to the present invention.
  • the satellite image radar moves from one point to two point trajectories, and the satellite image radar observes a target while moving the trajectory.
  • ta1 and ta2 are any different azimuth time within the time while observing the target.
  • the target on the ground is already set through the beam pointing, the position of the target is always known.
  • the position of the platform can be known at any time ta.
  • FIG. 2 is a flowchart illustrating a method of calculating an effect speed for satellite image radar signal processing.
  • a step of establishing a Pythagorean theorem for calculating a range using an effective velocity is performed (S100).
  • Equation for the azimuth time ta1 and ta2 is the same as [Equation 4] and [Equation 5] below.
  • Equation 6 The effect rate calculation formula established through the step S400 is shown in Equation 6 below.
  • the parameter ⁇ R ⁇ is preferably calculated by expanding the polynomial as shown in Equation 7 below using the position, velocity, and acceleration information.
  • R (ta2) and R (ta1) are directly obtained from the geometric model, and R (ta2 ') and R (ta1') are also short time. It is simply obtained by the amount of change during.
  • step S600 the value of the effective speed (V e) the Doppler time (zeo Doppler azimuth time) and the outermost accessible (closest approach) of the relevant parameter in accordance with calculation zero As can be calculated using the above Equation (2).
  • the Doppler azimuth time may be calculated by substituting the bearing times ta1 and ta2 into Equation 2, subtracting and developing the equations for the bearing times ta1 and ta2.
  • Equation 12 Since V e and ta0 are calculated through Equation 6 and Equation 11, when one of Equation 2 is used for an arbitrary time point, the closest distance R 0 is expressed as Equation 12] can be calculated immediately.
  • Equation 12 ta3 is used at an arbitrary time point, but it is preferable to set it as a time point midway between ta1 and ta2 in FIG.
  • FIG. 3 is a diagram comparing the case where the target focus V e calculated according to the focusing target with the present invention when using a V e calculated in a conventional manner.
  • V s (satellite) speed
  • V g (satellite) surface velocity

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

Selon la présente invention, un procédé de calcul de vitesse efficace pour un traitement de signal de radar à synthèse d'ouverture (SAR) comprend les étapes qui consistent : (a) à établir l'équation du théorème de Pythagore pour calculer un éventail à l'aide de la vitesse efficace; (b) à différencier partiellement l'équation du théorème de Pythagore de manière à transformer celle-ci en une équation différentielle partielle; (c) à substituer les temps d'azimut arbitraires ta1 et ta2 dans l'équation différentielle partielle de manière à établir des équations pour les temps d'azimut ta1 et ta2, respectivement; (d) à résoudre les équations simultanées, constituées des deux équations pour ta1 et ta2 de manière à établir une équation par rapport à la vitesse efficace (Ve); (e) à calculer "R" qui est un paramètre de l'équation de vitesse efficace (Ve); (f) à calculer la vitesse efficace en remplaçant le paramètre "R" dans l'équation de vitesse efficace (Ve). Par conséquent, la présente invention peut obtenir une vitesse efficace très précise avec une petite quantité de calcul.
PCT/KR2015/014388 2015-07-06 2015-12-29 Procédé de calcul de vitesse efficace pour traitement de signal radar à synthèse d'ouverture (sar) WO2017007095A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150095684A KR101684379B1 (ko) 2015-07-06 2015-07-06 위성용 영상레이더 신호처리를 위한 효과 속도 계산 방법
KR10-2015-0095684 2015-07-06

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WO2017007095A1 true WO2017007095A1 (fr) 2017-01-12

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080232709A1 (en) * 2007-03-22 2008-09-25 Harris Corporation Method and apparatus for registration and vector extraction of sar images based on an anisotropic diffusion filtering algorithm
US20140334518A1 (en) * 2013-05-08 2014-11-13 New York University System, method and computer-accessible medium for determining specific absorption rate obtained based on magnetic resonance imaging and temperature property measurements
KR20150055812A (ko) * 2013-11-14 2015-05-22 한국항공우주연구원 Ｓａｒ의 영상처리 방법

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Publication number Priority date Publication date Assignee Title
DE69327259T2 (de) * 1993-10-20 2000-06-08 Honeywell Inc Signalmetrikabschätzer
JP4498269B2 (ja) * 2005-11-30 2010-07-07 株式会社デンソーアイティーラボラトリ レーダ信号処理装置
KR101173954B1 (ko) * 2010-11-19 2012-08-14 국방과학연구소 Ｓａｒ 영상 형성을 위한 도플러 중심 주파수 정보 추정방법 및 그를 실행시키기 위한 프로그램을 기록한 컴퓨터 판독가능한 매체
KR101315243B1 (ko) 2013-03-07 2013-10-08 중앙항업(주) 위성레이더 영상의 도플러 중심주파수 변환방법

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080232709A1 (en) * 2007-03-22 2008-09-25 Harris Corporation Method and apparatus for registration and vector extraction of sar images based on an anisotropic diffusion filtering algorithm
US20140334518A1 (en) * 2013-05-08 2014-11-13 New York University System, method and computer-accessible medium for determining specific absorption rate obtained based on magnetic resonance imaging and temperature property measurements
KR20150055812A (ko) * 2013-11-14 2015-05-22 한국항공우주연구원 Ｓａｒ의 영상처리 방법

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CHIU, S. ET AL.: "Moving Target Indication via RADARSAT-2 Multichannel Synthetic Aperture Radar Processing.", EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING., vol. 2010, 10 December 2009 (2009-12-10), XP055346075 *

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