Beam Combination In Aperture Synthesis From Space: Field Of View Limitations And (U,V) Plane Coverage Optimization

Faucherre, M.; Merkle, F.; Vakili, F.

doi:10.1117/12.961516

Cited by 14 publications

(13 citation statements)

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“…In contrast to the long baselines of Michelson interferometers, Fizeau interferometry systems tend to have compact telescope arrays. An optimal imaging configuration designed for sparse arrays was first proposed by Golay. 3 Sparse arrays are promising for applications that do not require extremely high sensitivity ͑bright source present͒ and allow for a rather limited field of view 4,5 ͑FOV͒. Diffraction-limited performance has been demonstrated for sparse or dilute-aperture telescopes with active phasing control.…”

Section: Sparse Aperture Interferometric Arraysmentioning

confidence: 99%

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ARGOS testbed: study of multidisciplinary challenges of future spaceborne interferometric arrays

2004

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Abstract. Future spaceborne interferometric arrays must meet stringent optical performance and tolerance requirements while exhibiting modularity and acceptable manufacture and integration cost levels. The Massachusetts Institute of Technology (MIT) Adaptive Reconnaissance Golay-3 Optical Satellite (ARGOS) is a wide-angle Fizeau interferometer spacecraft testbed designed to address these research challenges. Designing a space-based stellar interferometer, which requires tight tolerances on pointing and alignment for its apertures, presents unique multidisciplinary challenges in the areas of structural dynamics, controls, and multiaperture phasing active optics. In meeting these challenges, emphasis is placed on modularity in spacecraft subsystems and optics as a means of enabling expandability and upgradeability. A rigorous theory of beam-combining errors for sparse optical arrays is derived and flown down to the design of various subsystems. A detailed elaboration on the optics system and control system is presented based on the performance requirements and beam-combining error tolerances. The space environment is simulated by floating ARGOS on a frictionless airbearing that enables it to track both fast and slow moving targets.

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Section: Sparse Aperture Interferometric Arraysmentioning

confidence: 99%

“…From the geometry of Fig. 5, Faucherre et al 5 derived the net OPD error due to the incorrect pupil mapping,…”

Section: Pupil Mapping Errormentioning

confidence: 99%

ARGOS testbed: study of multidisciplinary challenges of future spaceborne interferometric arrays

2004

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“…Then, the measurement-based system identification algorithm called Integrated Frequency domain Observability Range Space Extraction and Least Square parameter estimation algorithm (IFORSELS) 10,11 , is performed to derive a state-space representation of the system dynamics. IFORSELS algorithm integrates the Frequency domain Observability Range Space Extraction (FORSE) identi- The FORSE algorithm is a slight variation of the subspace identification algorithm derived by De Moor, et al 12 and its objective is to minimize the following cost to obtain the system matrices, A,B,C,D, (4) where is the frequency response samples from experiments.…”

Section: System Identificationmentioning

confidence: 99%

“…An optimal imaging configuration designed for sparse arrays was first proposed by Golay 2 . Sparse arrays are promising for applications that do not require extremely high sensitivity (bright source present) and allow for a rather limited field-of-view (FOV) 3,4 . A notable project in the area of phased telescope array is the Multipurpose Multiple Telescope Testbed (MMTT) 5 by Air Force Research Laboratory (AFRL).…”

Section: Introductionmentioning

confidence: 99%

Multidisciplinary Control of a Sparse Interferometric Array Satellite Testbed

Chung

LoBosco

Miller

et al. 2003

AIAA Guidance, Navigation, and Control Conference and Exhibit

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The MIT Adaptive Reconnaissance Golay-3 Optical Satellite (ARGOS) is a wide-angle Fizeau interferometer spacecraft testbed. Designing a space-based interferometer, which requires such high tolerances on pointing and alignment for its apertures, presents unique multidisciplinary challenges in the areas of structural dynamics, controls and multi-aperture phasing active optics. In meeting these challenges, emphasis is placed on modularity in spacecraft subsystems and optics as a means of allowing expandability and upgradeability. For the interferometer to function properly, unique methods of coherent wave front sensing are developed and used for error detection in control of the Fast Steering Mirrors (FSMs). The space environment is simulated by floating ARGOS on a frictionless air-bearing that allows it to track fast moving satellites such as the International Space Station (ISS), planets or point stars. A System Identification is performed on ARGOS to determine its dynamic properties and to design optimal controllers for the Attitude Control System (ACS). ACS sensors include an electronic compass with a 2-axis tip-tilt sensor, a viewfinder camera with centroiding algorithm, and a 3-axis rate gyroscope. Nonlinear, quaternionbased control is employed using reaction wheels as the spacecraft's actuators.

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“…An optimal imaging configuration designed for sparse arrays was first proposed by Golay 2 . Sparse arrays are promising for applications that do not require extremely high sensitivity (bright source present) and allow for a rather limited field-of-view (FOV) 3,5 . A notable project in the area of phased telescope array is the Multipurpose Multiple Telescope Testbed (MMTT) 6 by Air Force Research Laboratory (AFRL).…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of sparse aperture imaging systems

Chung¹,

Miller²,

Weck³

2002

SPIE Proceedings

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In order to better understand the technological difficulties involved in designing and building a sparse aperture array, the challenge of building a white light Golay-3 telescope was undertaken. The MIT Adaptive Reconnaissance Golay-3 Optical Satellite (ARGOS) project exploits wide-angle Fizeau interferometer technology with an emphasis on modularity in the optics and spacecraft subsystems. Unique design procedures encompassing the nature of coherent wavefront sensing, control and combining as well as various system engineering aspects to achieve cost effectiveness, are developed. To demonstrate a complete spacecraft in a 1-g environment, the ARGOS system is mounted on a frictionless air-bearing, and has the ability to track fast orbiting satellites like the ISS or the planets. Wavefront sensing techniques are explored to mitigate initial misalignment and to feed back real-time aberrations into the optical control loop. This paper presents the results and the lessons learned from the conceive, design and implementation phases of ARGOS. A preliminary assessment shows that the beam combining problem is the most challenging aspect of sparse optical arrays. The need for optical control is paramount due to tight beam combining tolerances. The wavefront sensing/control requirements appear to be a major technology and cost driver.

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Beam Combination In Aperture Synthesis From Space: Field Of View Limitations And (U,V) Plane Coverage Optimization

Cited by 14 publications

References 0 publications

ARGOS testbed: study of multidisciplinary challenges of future spaceborne interferometric arrays

ARGOS testbed: study of multidisciplinary challenges of future spaceborne interferometric arrays

Multidisciplinary Control of a Sparse Interferometric Array Satellite Testbed

Design and implementation of sparse aperture imaging systems

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