XXII ISPRS Congress 2012: Technical Commission VII

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Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663821976

Title:: Technical Commission VII

Scope:: 546 Seiten

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663821976

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B7)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VII/7: THEORY AND EXPERIMENTS IN RADAR AND LIDAR]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: SPACEBORNE SAR IMAGERY STEREO POSITIONING BASED ON RANGE-COPLANARITY EQUATION C. Q. Cheng, J. X. Zhang, G. M. Huang,C. F. Luo

Document type:: Multivolume work

Structure type:: Chapter

bined el and (3) ength, r and point r, and n isa /s the apling uation oppler tween nd the built, round direct uation ation and a ection model is the 1, the (2). R-Cp d that side- s but radar, uency del is aging mmon res of e real jy the ed R- zes. If in the process of focus on imaging caused other deformation, International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia R-Cp model may not be suitable for. Range Coplanrity equation: equation: Ball ; xiv Coplanrity =. equation: Col/Range 4 ground en > e/Arc Se imag Range ee 3 equation: image points circularity Range M equation: Denier Bali equation: ter Cone equation: hyperbola > zit Fig 2 R-D model and R-Cp model positioning principle 2.3 Orbit attitude model of spaceborne SAR In SAR imaging process, the motion compensation and focusing were occurred, so the satellite orbit and attitude data were compensated to an ideal state. Therefore, no matter what rigorous model, SAR remote sensing image geometry processing should use the data that motion compensation referenced. As the stability of the satellite in orbit, under normal circumstances, when imaging the reference orbit, the speed and the actual track, speed is approximately the same. Reference attitude is generally constant or uniform changes, in the absence of a reference value then the middle or mean value of original data could be taken as the initial value, and could get according to the Doppler parameter value. TerraSAR-X image adopt the O0 value Doppler imaging parameters for focus, this means that the beam center planarity is perpendicular to the velocity direction in imaging. in this paper, according to this conditions to calculate the sensor initialization attitude value after SAR imaging motion compensation. When the three attitude angles are all zero, the beam center plane is perpendicular to the axis Xo vector, when the Doppler parameter is 0, the beam center plane is perpendicular to the velocity vector. Xo axis and speed direction can achieve the coincidence by rotating around the Yo-axis of ¢ angle, therefore, when the Doppler parameter is 0, equivalent to the three original attitude value is (0,¢,0) . Asa result, unit speed vector in geocentric rectangular coordinate could also be calculated by a unit vector Xo axis and associated rotation matrix , that is: [s v x28 Rt o d (en [vs v, v.]" is unit speed vector. Based on the formula (6), Xo,Yo,Zo,Vx,Vy,Vz is the satellite position and speed state vector in ECR coordinate system, the pitch angle ¢, could be calculated: A --asin (2), VHD), - » HZ), »] d As the satellite's orbit and attitude in a certain time with very good stability, errors of initial value of orbit and attitude in a certain time expressed as systemic, and its orbit error and attitude error with low-level polynomial fitting could meet the positioning accuracy. For one scene the TerraSAR-X imaging track is short, linear polynomial is used as refined model for orbit attitude model, namely: X, =X ta tat Y, =Y,, +b, + bt (8) Ze = Zug Cop t6 9-9 *f,t*ft K-Kytgy t gil In the formula (8) (X50. Yso. 750: PoKo) are the ephemeris attitude initial value, a,b;,c.f;,gi(i=0,1...) are ephemeris and attitude refined model parameters. 2.4 Stereo positioning model of spaceborne SAR In order to achieve the high accuracy of the remote sensing image positioning the orbital and attitude parameters must be refined. Substituted the linear model (8) into formula (4). the refined orbit attitude model parameters aj, bacfig: (1,2) and the ground point coordinates increment (AX, AY, AZ) as the unknowns, coordinates measurement error equation of the image point are got through linearized R-Cp equations: V. m fug Pus fa infa figno +f 8 ful hl a FSF, (0) V, m fat foh fo opo og +o + habt an Ef +1 FX NY, Where, f. are coefficient of error equation about refined orbit and attitude model parameters and unknown ground point coordinates increment. Ix. [y for the constant term. Based on R-Cp geometric imaging model error equations of pixel coordinates, ground coordinate, refined model coefficient of ephemeris and attitude are got for adjustment model of satellite SAR images positioning:

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