Optical Correlator based Optical Flow Processor for Real Time Visual Navigation

Tchernykh, V.; Beck, Martín; Janschek, Klaus

doi:10.5772/4990

Cited by 2 publications

(4 citation statements)

References 21 publications

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“…To generate this load, in this test only random vibration between upper and lower frequency limits were exerted, as deemed the most critical for the device in a space application. Random vibration is more characteristic of modern-field environments produced by rocket engines [7]. To apply the required vibration levels, a LDS555 electro-dynamic shaker with an LDS PA1000L linear power amplified was employed.…”

Section: Vibration Testmentioning

confidence: 99%

“…On the other hand, in the last years a significant growth of the possibilities of SLM devices has been observed in new research topics for space applications where SLM technologies provide an added value in crucial issues like mass, volume, power consumption and reliability. For example, MMAs bring benefits in the multi-object-spectroscopy in order to measure efficiently a large number of stars and galaxies [5]; in adaptive optics field, enabling wavefront error correction and improving the observation through inhomogeneous media [6]; and in planetary landing navigation where a MMA is the main component in optical correlators [7]. *sara.frances-gonzalez@ipms.fraunhofer.de; phone +49 351 8823-472; https://www.ipms.fraunhofer.de…”

Section: Introductionmentioning

confidence: 99%

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Towards a spatial light modulator technology for space applications: performance analysis under the environmental conditions

González

Berndt

Gallego

et al. 2023

International Conference on Space Optics — ICSO 2022

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Spatial Light Modulator (SLM) technologies are well established in many application fields over the last decades. Addressing challenging operational conditions, a special class of high-speed SLMs has emerged over the past 20 years, namely Micromirror Array (MMA) devices. Fraunhofer IPMS MMA technology has enabled several ultraviolet photolithography applications at industrial scale. Given the fact that these devices are available for scientific testing, we proposed to explore for the first time their functionality and performance with respect to the space application requirements for the European framework cooperation. Previous studies strongly support this approach with the investigation of several SLM technologies for space instrumentation.In this study, the key parameters of an already available 256 x 256 pixel MMA device have been assessed and its performance has been evaluated under environmental constraints of a future space mission, in terms of temperature (from -40 °C to 80 °C), vacuum (< 10 -5 mbar) and vibrations in X-, Y-and Z-axes, showing zero failure rate for the MMA device after all tests. These experimental findings, together with simulations results, confirm the robustness of the MMA technology, especially against temperature changes, and encourage further activities for the development of a spacecustomized spatial light modulator technology.

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Section: Vibration Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards a spatial light modulator technology for space applications: performance analysis under the environmental conditions

González

Berndt

Gallego

et al. 2023

International Conference on Space Optics — ICSO 2022

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“…To measure the effect of flutter on imaging, a variety of image motion measurement methods have been proposed. The method based on joint transform correlator (JTC) has been widely used in camera image motion measurement [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. The authors in [ 24 ] proposed an approach to restore a motion-blurred image in real time using optoelectronic hybrid joint transform correlation.…”

Section: Introductionmentioning

confidence: 99%

“…Both the image motion measurement method based on JTC and the image motion detection method based on remote sensing images require a rich image level of the object to be photographed and a high signal-to-noise ratio [ 17 ]. Ensuring accuracy becomes difficult when the remote sensing image is smooth or the signal-to-noise ratio is low.…”

Section: Introductionmentioning

confidence: 99%

Image Motion Measurement and Image Restoration System Based on an Inertial Reference Laser

Ronggang

Wang

Jin

et al. 2021

Sensors

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Satellites have many high-, medium-, and low-frequency micro vibration sources that lead to the optical axis jitter of the optical load and subsequently degrade the remote sensing image quality. To address this problem, this paper developed an image motion detection and restoration method based on an inertial reference laser, and describe edits principle and key components. To verify the feasibility and performance of this method, this paper also built an image motion measurement and restoration system based on an inertial reference laser, which comprised a camera (including the inertial reference laser unit and a Hartmann wavefront sensor), an integrating sphere, a simulated image target, a parallel light pope, a vibration isolation platform, a vibration generator, and a 6 degrees of freedom platform. The image restoration principle was also described. The background noise in the experiment environment was measured, and an image motion measurement accuracy experiment was performed. Verification experiments of image restoration were also conducted under various working conditions. The experiment results showed that the error of image motion detection based on the inertial reference laser was less than 0.12 pixels (root mean square). By using image motion data to improve image quality, the modulation transfer function (MTF) of the restored image was increased to 1.61–1.88 times that of the original image MTF. The image motion data could be used as feedback to the fast steering mirror to compensate for the satellite jitter in real time and to directly obtain high-quality images.

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Optical Correlator based Optical Flow Processor for Real Time Visual Navigation

Cited by 2 publications

References 21 publications

Towards a spatial light modulator technology for space applications: performance analysis under the environmental conditions

Towards a spatial light modulator technology for space applications: performance analysis under the environmental conditions

Image Motion Measurement and Image Restoration System Based on an Inertial Reference Laser

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