&lt;title&gt;Raven automated small telescope systems&lt;/title&gt;

Sydney, P.; Africano, J. L.; Fredericks, A. C.; Hamada, Kris; Hoo, Vicki Soo; Nishimoto, D.; Kervin, P.; Bisque, Steve; Bisque, Matthew

doi:10.1117/12.405780

Cited by 4 publications

(10 citation statements)

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“…Raven class electro-optical sensors are the current state of the art in high accuracy, steerable space surveillance sensors. Raven class sensors have demonstrated a high-calibre capability for an atypically low cost [32,35,36]. The Raven class is described as a design paradigm for an autonomous electro-optical system that achieves high accuracy whilst comprising of commercial off-the-shelf (COTS) hardware and software to enhance supportability and minimise cost.…”

Section: High-fidelity Simulation Via Tasmanmentioning

confidence: 99%

“…Measurement error covariance for each sensor was modelled using the matrix where the standard deviations of optical measurements of right ascension and declination are denoted as σ α and σ δ respectively and were each set to equal 1 arcsecond. This level of measurement error was chosen to replicate the levels of noise present in Raven Class electrooptical sensors [35,36]. Association of observation data with catalogued objects was assumed perfect.…”

Section: Sensor Modelmentioning

confidence: 99%

“…In the absence of observation diversity, optical sensors are likely to reduce in-track error while supplying poor radial information due to accurate angle measurements and the absence of range information. High angular accuracy, as produced by Raven class sensors [35], is achieved by utilising the star field behind the target to perform astrometric measurements to obtain higher accuracy than could otherwise be achieved by extrapolation from the sensor's mount orientation. While no range information is directly observed, the timing between multiple measurements, each with their own error tolerances, may be used to reduce the region in which the target is likely to reside from an infinite cone to finite volume.…”

Section: Sensor Modelsmentioning

confidence: 99%

“…Whilst not without their own limitations, due in large to an optical sensor's reliance on passive illumination of the target, the cost of observing RSOs at range is significantly reduced. Exposure of optical surveillance strategies to space surveillance agencies and researchers of SSA has resulted in developments such as space-based space surveillance [28,34], wide-field optical surveillance [29] and low cost, high accuracy steerable sensors [35][36][37]. Whilst these latest innovations in space surveillance technologies promise a number of improvements, it is the attributes of the steerable sensors that have prompted investigation of the nonconventional practices for maintaining RSO catalogues that are detailed in this thesis.…”

Section: Introductionmentioning

confidence: 99%

“…These sensors necessitate an alternative but complementary approach to space surveillance as they intermittently interrogate confined regions of space rather than stare indefinitely or regularly sweep their entire surveillance volume. The current state of the art in steerable sensors is the Raven class electro-optical sensor [35,36]. This class of sensor offers features such as low cost, high accuracy, scalability, flexibility and the potential for higher than existing levels of automation [37].…”

Section: Introductionmentioning

confidence: 99%

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Sensor management for enhanced catalogue maintenance of resident space objects

Hobson¹

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The research detailed in this thesis explores the deployment of steerable sensors as an efficient means of improving the capability, capacity and timeliness of existing space surveillance systems, to provide superior levels of Space Situational Awareness (SSA) through enhanced sensor management. These improvements are necessary as the world's increasing reliance on spacefaring has brought about the accumulation of an enormous quantity of man-made objects orbiting the Earth. For almost 60 years the number of objects has grown, causing a commensurate increase in the likelihood of destructive collisions involving manned missions and important space assets. To predict and ideally prevent collisions, a number of agencies endeavour to track as many Resident Space Objects (RSOs) as possible. Recent events involving unprecedented surges in the number of RSOs have made it clear that the ability to continue to operate safely in Earth orbit will require enhancements to existing levels of SSA. The act of maintaining SSA is reliant on many sources of information, of which a primary source is the direct observation of RSOs by space surveillance sensors. These observations are utilised to compile and maintain a catalogue of RSO's orbital state estimates that is analysed to determine the likelihood of collision. Surveillance of this environment is a challenging task that currently has a large dependence on legacy systems and techniques that can benefit from modernisation via the introduction of contemporary technologies and methodologies. Due to potential benefits such as low cost, high accuracy, scalability, flexibility and automation, the large scale deployment of steerable sensors is proposed as a means of improving existing catalogue maintenance systems.Researching a judicious means of deploying and exploiting steerable sensors to improve the capability, capacity and timeliness of space surveillance networks requires consideration of the management of sensors at both a network and an individual level.The exploration begins at the network level with an analysis of existing practices for maintaining RSO catalogues to understand how catalogue accuracy is affected when steerable sensors are employed. Through numerical simulation, the effectiveness of the current state of the art in steerable sensors, a class of electro-optical sensor, is contrasted with traditional radar surveillance. The findings indicate that if the current state of the art in steerable sensors were to be widely deployed as the primary contributing sensors, catalogue accuracy would increase significantly. The findings also show that greater catalogue accuracy could be expected if effects caused by passive optical sensing to observability of RSO range and sensor availability can be minimised.Methods for improving observability and availability when using networks of optical sensors are investigated next. Measurement level sensor fusion and efficient analysis of the iii network's visibility of the RSO catalogue are considered. The investigation's result...

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Section: High-fidelity Simulation Via Tasmanmentioning

confidence: 99%

Section: Sensor Modelmentioning

confidence: 99%

Section: Sensor Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensor management for enhanced catalogue maintenance of resident space objects

Hobson¹

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Characterization of the near-Earth Asteroid 2002 NY40

Roberts¹,

Hall²,

Lambert³

et al. 2007

Icarus

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In August 2002, the near-Earth asteroid 2002 NY 40 , made its closest approach to the Earth. This provided an opportunity to study a near-Earth asteroid with a variety of instruments. Several of the telescopes at the Maui Space Surveillance System were trained at the asteroid and collected adaptive optics images, photometry and spectroscopy. Analysis of the imagery reveals the asteroid is triangular shaped with significant self-shadowing.The photometry reveals a 20-hour period and the spectroscopy shows that the asteroid is a Q-type.

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Satellite Ephemeris Correction via Remote Site Observation for Star Tracker Navigation Performance Improvement

Diaz¹

2016

The International Technical Meeting of the the Institute of Navigation

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that helped keep me on track and fine tune this work. Special thanks to the great ANT center staff for providing the equipment, technical assistance, and admin support needed during this research. I would also like to extend my thanks to my friends and mentors from my previous unit at Patrick AFB, since it was there where they encouraged and motivated me to pursue my graduate degree here at AFIT. Finally, I wish to thank my family, especially my wife for her support and constant encouragement during these last 18 months. Without their support, none of the work presented in this thesis would have been possible.

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<title>Raven automated small telescope systems</title>

Cited by 4 publications

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Sensor management for enhanced catalogue maintenance of resident space objects

Sensor management for enhanced catalogue maintenance of resident space objects

Characterization of the near-Earth Asteroid 2002 NY40

Satellite Ephemeris Correction via Remote Site Observation for Star Tracker Navigation Performance Improvement

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