Measurement of Hyperion MTF from on-orbit scenes

Nelson, Neil; Barry, P.S.

doi:10.1117/12.492672

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…Additional details of the edge target requirement can be seen in [168]. Edge target can either be natural, such as moon [169], agricultural field boundaries [170], sea/icefield transitions [171], or artificial, such as painted concreate, often designed as a checkerboard pattern (can be seen in Figure 12a), tarp-made [172] or parking lot. The natural or artificial MTF target is selected based on the trade-offs between sensor GSD, uniformity in bright and dark region, and line sharpness.…”

Section: Modulation Transfer Functionmentioning

confidence: 99%

Vicarious Methodologies to Assess and Improve the Quality of the Optical Remote Sensing Images: A Critical Review

2020

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Over the past decade, number of optical Earth-observing satellites performing remote sensing has increased substantially, dramatically increasing the capability to monitor the Earth. The quantity of remote sensing satellite increase is primarily driven by improved technology, miniaturization of components, reduced manufacturing, and launch cost. These satellites often lack on-board calibrators that a large satellite utilizes to ensure high quality (radiometric, geometric, spatial quality, etc.) scientific measurement. To address this issue, this work presents “best” vicarious image quality assessment and improvement techniques for those kinds of optical satellites which lack an on-board calibration system. In this article, image quality categories have been explored, and essential quality parameters (absolute and relative calibration, aliasing, etc.) have been identified. For each of the parameters, appropriate characterization methods are identified along with their specifications or requirements. In cases of multiple methods, recommendations have been made based-on the strengths and weaknesses of each method. Furthermore, processing steps have been presented, including examples. Essentially, this paper provides a comprehensive study of the criteria that need to be assessed to evaluate remote sensing satellite data quality, and the best vicarious methodologies to evaluate identified quality parameters such as coherent noise and ground sample distance.

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Section: Modulation Transfer Functionmentioning

confidence: 99%

Vicarious Methodologies to Assess and Improve the Quality of the Optical Remote Sensing Images: A Critical Review

2020

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“…Other MTF contributions which impact the image quality are the effects of particles in the atmosphere which are harder to estimate. Instead, the required MTF value related to the ADCS was approximated based on two reference optical payloads: Hyperion [7] and GeoEye-1 [8]. At visible wavelengths, the Hyperion payload was given a requirement value > 20%, while pre-flight MTF measurements showed a value of 20-29% depending on the wavelength and field of view angle.…”

Section: System Design and Payload Pointing Accuracymentioning

confidence: 99%

A cutting edge 6U CubeSat ADCS design for Earth observation with sub-meter spatial resolution at 230–380 km altitude

Kuiper

Dolkens

2020

CEAS Space J

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A 6U CubeSat for Earth observation in 230–350 km orbits with sub-meter resolution is presented. The proposed Stable and Highly Accurate Pointing Earth-Imager (SHAPE) system’s attitude determination and control system (ADCS) is composed of a single momentum bias wheel with magnetic bearings at rotational speeds of 6000–7000 rpm and refined magnetorquers. Reaction wheels as instability source are absent. The ADCS stabilizes the spacecraft attitude by counteracting the torques from external disturbances in the thermosphere down to < 1° pointing accuracy and < 0.1° instability. The momentum wheel was sized to an angular momentum of 1 Nms based on the worst-case atmospheric density of the next solar cycle. The 0.5 Am2 magnetorquer dipole moment provides with low power consumption, mass and cost, high reliability and sufficient torque. The ADCS initialisation study revealed three stable start-up modes, while the all-spun state is achieved using a set of thrusters. De-tumbling analysis show that the magnetorquers reduce the tumbling rates with magnitudes of up to 35°/s to mean motion values in less than an orbit using a static gain B-dot controller. A 3U camera design capable of sub-meter spatial resolution at 230 km altitude is presented which complies with the SHAPE spacecraft system design. The instrument has a single deployable primary mirror enabled by a deployment hinge design with hysteresis < 0.5 μ. This payload combined with air-breathing electric propulsion technology at 230 km nominal altitude boosts the SHAPE system Earth observation potential down to sub-meter spatial resolution and enables tuning of the mission lifetime by orbit keeping.

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“…The model of these effects is proposed by using the pixel processing method and the modulation transfer function (MTF) method [22,23]. In order to know the MTF effect of the optical system directly, these effects are simulated respectively by using the MATLAB.…”

Section: Theoretical Modeling Of the Sensor Devicementioning

confidence: 99%

Integrative Multi-Spectral Sensor Device for Far-Infrared and Visible Light Fusion

et al. 2018

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Infrared and visible light image fusion technology is a hot spot in the research of multi-sensor fusion technology in recent years. Existing infrared and visible light fusion technologies need to register before fusion because of using two cameras. However, the application effect of the registration technology has yet to be improved. Hence, a novel integrative multi-spectral sensor device is proposed for infrared and visible light fusion, and by using the beam splitter prism, the coaxial light incident from the same lens is projected to the infrared charge coupled device (CCD) and visible light CCD, respectively. In this paper, the imaging mechanism of the proposed sensor device is studied with the process of the signals acquisition and fusion. The simulation experiment, which involves the entire process of the optic system, signal acquisition, and signal fusion, is constructed based on imaging effect model. Additionally, the quality evaluation index is adopted to analyze the simulation result. The experimental results demonstrate that the proposed sensor device is effective and feasible.

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Measurement of Hyperion MTF from on-orbit scenes

Cited by 5 publications

References 4 publications

Vicarious Methodologies to Assess and Improve the Quality of the Optical Remote Sensing Images: A Critical Review

Vicarious Methodologies to Assess and Improve the Quality of the Optical Remote Sensing Images: A Critical Review

A cutting edge 6U CubeSat ADCS design for Earth observation with sub-meter spatial resolution at 230–380 km altitude

Integrative Multi-Spectral Sensor Device for Far-Infrared and Visible Light Fusion

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