&lt;title&gt;Laboratory and field experimental demonstration of a Fourier telescopy imaging system&lt;/title&gt;

Cuellar, Edward Louis; Stapp, James; Cooper, Justin

doi:10.1117/12.615444

Cited by 12 publications

(7 citation statements)

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“…The atmosphere is ignored atmosphere because previous work has shown very little effect due to downlink atmosphere with the FT imaging technique. 9,4 This is reasonable because the atmosphere is only a thin layer in the far field of the source of reflected light. The path through the atmosphere is too small to appreciably redistribute the energy that will reach the receiver.…”

Section: Propagation To Receiver (Downlink)mentioning

confidence: 98%

“…2,3,4 In this system design, for example, three beams would be transmitted simultaneously in pulses to image a geosynchronous object. It would take many hours to transmit the tens of thousands of pulses needed to construct all of the spatial frequencies needed to form an image of the object.…”

Section: Introductionmentioning

confidence: 99%

“…Previous experiments in both the lab and field have verified that this implementation of the Fourier Telescopy technique to imaging geostationary targets is both viable and robust. 4,6 Under the Satellite Active Imaging National Testbed (SAINT) program, the current interest is in imaging objects in low earth orbit. The limited engagement time and rapidly changing orientation of the object with respect to a ground station means that the data needed to form an image must be obtained in a few seconds.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of a Fourier telescopy imaging system for objects in low Earth orbit

et al. 2006

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Software has been developed for the SAINT program that simulates the operation of a Fourier Telescopy imaging system that could potentially be used to create images of a satellite in low earth orbit. Fourier telescopy uses multiple beams that illuminate the target with a fringe pattern that sweeps across it due to frequency differences between beams. In this way the target spatial frequency components are encoded in the temporal signal that is reflected from the target. The software simulates the propagation effects and target interaction effects that would be present in a real system. This enables the creation of a simulated received signal as a function of time. A particular problem was accurately modeling the appearance of the target as its aspect changes during a rapid transit over the transmitter and receiver. A novel reconstructor has been developed that compensates for atmospheric phase fluctuations affecting the large number of beams transmitted simultaneously( ~10). The reconstructor solves for hundreds of image Fourier components simultaneously, permitting rapid reconstruction of the image.

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Section: Propagation To Receiver (Downlink)mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of a Fourier telescopy imaging system for objects in low Earth orbit

et al. 2006

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“…Figure 1 shows the simulation of reconstructed images with  . A measure of the accuracy of the reconstruction is given by the image Strehl which compares the intensity distribution in the reconstructed image to that in the diffraction limited target (truth image) 9 . The Strehl value is…”

Section: Demodulation Of Fourier Telescopymentioning

confidence: 99%

Signal demodulation of Fourier telescopy based on spectrum correction

Xiangli

Zhang

et al. 2013

SPIE Proceedings

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Fourier telescopy is an active unconventional imaging technique. Three or more beams from different spatially separated transmitters are pointed at a distant and faint object. The spatial Fourier spectrum of the object is carried on the reflected temporally modulated signals. The image of the target can be reconstructed from the back signals by demodulation and phase closure algorithm. The conventional demodulation processing is calculating spectrum directly by inverse Fourier transform of the signal. However spectrum estimated by inverse Fourier transform has non-negligible errors caused by frequency shift error of the Acoustic-optical modulator, the noise and the relative motion between beams and the target. An improved demodulation method based on spectrum correction of FT is proposed. The method corrects the amplitude and the phase on the demodulated frequency of the signal by which better reconstructed image can be obtained. In this paper, the effect of the frequency shift error in Fourier telescopy demodulation is investigated. The degradation of the reconstructed image is simulated. We summarize the new demodulation method based on spectrum correction and give the simulated comparison between the conventional demodulation and the developed method. The result confirms the effectiveness of the improved demodulation method.

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“…Holmes described the technique of Fourier telescopy in detail 10 . Nowadays much of the analysis has been performed on Fourier telescopy [11][12][13][14][15][16] . In this technique, an object is illuminated by several laser apertures, and the interference fringes modulated the object reflectivity.…”

Section: Background and Development Of Fourier Telescopymentioning

confidence: 99%

High-resolution imaging techniques based on optical synthetic aperture

Wang

Rao

Jiang

et al. 2007

3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

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The quest for higher angular resolution in astronomy will inevitably require the telescope with large aperture. However, the diameter of primary mirror is limited by the fabrication problems as well as the scaling laws of manufacturing costs. Optical synthetic aperture telescopes represent a promising new technology to overcome the above-mentioned problems. Three incoherent imaging techniques based on optical synthetic aperture including Fourier telescopy, Michelson interferometer and Fizeau interferometer are described in the paper. Fourier telescopy is an active imaging technique combined with the advantages of synthetic aperture measurement. Michelson interferometers measure spatial Fourier transform of objects, while Fizeau interferometers produce direct images with full instant frequency coverage. We give an overview of the basic aspects and the differences of these techniques.

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<title>Laboratory and field experimental demonstration of a Fourier telescopy imaging system</title>

Cited by 12 publications

References 0 publications

Simulation of a Fourier telescopy imaging system for objects in low Earth orbit

Simulation of a Fourier telescopy imaging system for objects in low Earth orbit

Signal demodulation of Fourier telescopy based on spectrum correction

High-resolution imaging techniques based on optical synthetic aperture

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