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RU2020136746A - A method for obtaining a three-dimensional radar image of the earth's surface in a two-pass interferometric shooting mode from an unmanned aerial vehicle - Google Patents

A method for obtaining a three-dimensional radar image of the earth's surface in a two-pass interferometric shooting mode from an unmanned aerial vehicle Download PDF

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Publication number
RU2020136746A
RU2020136746A RU2020136746A RU2020136746A RU2020136746A RU 2020136746 A RU2020136746 A RU 2020136746A RU 2020136746 A RU2020136746 A RU 2020136746A RU 2020136746 A RU2020136746 A RU 2020136746A RU 2020136746 A RU2020136746 A RU 2020136746A
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RU
Russia
Prior art keywords
radar
complex
images
dimensional
radar image
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Application number
RU2020136746A
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Russian (ru)
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RU2020136746A3 (en
RU2748760C2 (en
Inventor
Владимир Павлович Лихачев
Виктор Андреевич Кузнецов
Алексей Викторович Унковский
Original Assignee
Виктор Андреевич Кузнецов
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Виктор Андреевич Кузнецов filed Critical Виктор Андреевич Кузнецов
Priority to RU2020136746A priority Critical patent/RU2748760C2/en
Publication of RU2020136746A publication Critical patent/RU2020136746A/en
Publication of RU2020136746A3 publication Critical patent/RU2020136746A3/ru
Application granted granted Critical
Publication of RU2748760C2 publication Critical patent/RU2748760C2/en

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Classifications

    • 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
    • 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
    • G01S13/9021—SAR image post-processing techniques
    • 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
    • G01S13/9021—SAR image post-processing techniques
    • G01S13/9023—SAR image post-processing techniques combined with interferometric techniques
    • 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
    • G01S13/9021—SAR image post-processing techniques
    • G01S13/9027—Pattern recognition for feature extraction

Landscapes

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

Claims (1)

Способ получения трехмерного радиолокационного изображения земной поверхности в двухпроходном интерферометрическом режиме съемки с беспилотного летательного аппарата, заключающийся в том, что с помощью радиолокационной системы производят съёмку с близких повторяющихся траекторий носителя, расстояние между которыми составляет базу синтезируемого интерферометра, синтезируют пару двумерных комплексных радиолокационных изображений, полученных при съемке выбранного участка поверхности с разных ракурсов наблюдения, проводят пространственное совмещение радиолокационных изображений одной и той же области поверхности, например, с использованием корреляционных методов, формируют интерферограмму в координатах «азимут-дальность» путем поэлементного комплексного перемножения двух предварительно согласованных радиолокационных изображений, при этом второе изображение должно быть комплексно-сопряженным, проводят фильтрацию шумов интерферограммы с помощью фильтра, раскрывают фазовую неоднозначность, пересчитывают разности фаз на высоты рельефа, переходят от полетной системы координат к какой-либо картографической и формируют визуальное трехмерное радиолокационное изображение, отличающийся тем, что дополнительно в случае отсутствия в зоне обзора бортовой радиолокационной станции радиоконтрастных объектов, высоких объектов или при малом отношении сигнал-шум, по паре синтезированных двумерных комплексных радиолокационных изображений, полученных при съемке выбранного участка поверхности с разных ракурсов наблюдения, вычисляют локальную энтропию по модулям комплексных отчетов радиолокационного изображения и по вычисленным максимумам градиента области локальной энтропии, принадлежащих участку радиолокационной тени, проводят определение пар опорных точек, для последующего пространственного совмещения по ним изображений, например, корреляционным методом. A method for obtaining a three-dimensional radar image of the earth's surface in a two-pass interferometric imaging mode from an unmanned aerial vehicle, which consists in the fact that using a radar system, images are taken from close repeating trajectories of the carrier, the distance between which is the base of the synthesized interferometer, and a pair of two-dimensional complex radar images obtained when shooting a selected area of the surface from different angles of observation, spatial alignment of radar images of the same surface area is carried out, for example, using correlation methods, an interferogram is formed in the coordinates "azimuth-range" by element-wise complex multiplication of two pre-agreed radar images, while the second image should be complex-conjugate, filtering the noise of the interferogram using a filter, reveal the phase ambiguity, ne the phase differences are calculated for the elevation of the relief, they pass from the flight coordinate system to any cartographic system and form a visual three-dimensional radar image, characterized in that, in addition, if there are no radio contrast objects, tall objects in the field of view of the on-board radar station, or with a low signal-to-noise ratio , based on a pair of synthesized two-dimensional complex radar images obtained when shooting a selected surface area from different observation angles, the local entropy is calculated from the modules of the complex reports of the radar image and from the calculated maxima of the gradient of the local entropy area belonging to the radar shadow area, pairs of control points are determined, for subsequent spatial alignment of images on them, for example, using the correlation method.
RU2020136746A 2020-11-09 2020-11-09 Method for obtaining three-dimensional radar image of earth surface in two-pass interferometric shooting mode from unmanned aerial vehicle RU2748760C2 (en)

Priority Applications (1)

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RU2020136746A RU2748760C2 (en) 2020-11-09 2020-11-09 Method for obtaining three-dimensional radar image of earth surface in two-pass interferometric shooting mode from unmanned aerial vehicle

Applications Claiming Priority (1)

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RU2020136746A RU2748760C2 (en) 2020-11-09 2020-11-09 Method for obtaining three-dimensional radar image of earth surface in two-pass interferometric shooting mode from unmanned aerial vehicle

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RU2748760C2 RU2748760C2 (en) 2021-05-31

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JP2596364B2 (en) * 1993-12-28 1997-04-02 日本電気株式会社 Topographic map generator using three-dimensional information obtained from interferometric synthetic aperture radar
RU2265866C1 (en) * 2004-01-28 2005-12-10 Закрытое акционерное общество "Новые технологии" Method for increasing radiolocation resolution, system for realization of method and method for remote detection of small objects by system
US7205927B2 (en) * 2005-06-03 2007-04-17 Raytheon Company Technique for low grazing angle 3D SAR target recognition
RU2290663C1 (en) * 2005-08-08 2006-12-27 Рязанская государственная радиотехническая академия (РГРТА) Method for producing a three-dimensional radiolocation image of a surface
EP1959270A1 (en) * 2007-02-15 2008-08-20 Selex Sensors and Airborne Systems Limited Improved synthetic aperture radar technique
RU2368918C1 (en) * 2008-04-07 2009-09-27 Федеральное агентство по образованию Государственное образовательное учреждение высшего профессионального образования Рязанский государственный радиотехнический университет Method of forming three-dimensional surface images based on onboard radio-thermal locator
RU2513122C2 (en) * 2012-06-01 2014-04-20 Закрытое акционерное общество "Электронно-вычислительные информационные и инструментальные системы" System and method for three-dimensional imaging of brightness radar map
ITUA20164568A1 (en) * 2016-06-21 2017-12-21 Thales Alenia Space Italia Spa Con Unico Socio METHOD OF FORMING SAR IMAGES FOR INTERFEROMETRIC ANALYSIS
RU2643790C1 (en) * 2016-12-08 2018-02-06 федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") Method of earth surface relief measurement
RU2707556C1 (en) * 2019-03-06 2019-11-28 Акционерное общество "Научно-исследовательский институт Приборостроения имени В.В. Тихомирова" Method of determining terrain elevation height of a radar with synthesized antenna aperture
CN110703252B (en) * 2019-11-11 2021-07-09 中国科学院电子学研究所 Digital elevation model correction method for interferometric synthetic aperture radar shadow area

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