Спутник ДЗЗ. DubaiSat 1. [Редактировать]

Cпутник дистанционного зондирования Земли, изготовлен по заказу Национального института перспективной науки и техники (EIAST)(ОАЭ) южнокорейской фирмой Satrec Initiative, предназначен для мониторинга климатических явлений и окружающей среды. Одновременно с ним на орбиту были выведены пять спутников — испанские NanoSat-1B и Deimos-1, американские спутники AprizeSat-3 и 4 и британский спутник UK DMC-2. Для выполнения своих непосредственных обязанностей на нём смонтирована оптико-электронная аппаратура DMAC (от англ. DubaiSat Medium-sized Aperture Camera), позволяющая работать спутнику в двух режимах: панхроматическом и в многоспектральном (цветном) с разрешающей способностью 5 метров. Монитор космической радиации SRM для измерения суммарной дозы ионизирующих излучений. Для питания систем спутника на нём смонтированы три панели солнечных батарей, которые выдают до 360 Вт, и аккумуляторная никель-кадмиевая батарея. Предполагается, что к концу срока эксплуатации аккумуляторная сборка будет иметь емкость 14,4 А ч

Дополнительные наименования

#НаименованияПоиск в новостяхПоиск в документах
135682НайтиНайти
2DubaiSat-1НайтиНайти
3DubaiSat-1НайтиНайти

Дополнительная классификация

#Наименования
1Страна оператор(владелец) - ОАЭ
2Тип оператора(владельца) - государственный
3Тип орбиты - НОО
4Страна производитель - Южная Корея
5Все спутники ДЗЗ

Технические характеристики

#ХарактеристикаЗначение
1Масса, кг200
2Пространственное разрешение в надире (панхроматический), метра2.5
3Пространственное разрешение в надире (мультиспектральный), метра5
4Полоса захвата, км20
5Платформа 1xSI-200
6Скорость (передачи данных на Землю), Мбит в секунду30
7Количество (спектральных полос), шт.4
8Количество (бит на точку), бит8
9Полезная нагрузка 1xDMAC
10Мощность, Вт330
11Емкость (запоминающего устройства), гбит64

Характеристики орбиты

#ХарактеристикаЗначение
1Наклонение, град98.0
2Апогей, км683.7
3Перигей, км668.5
4Период, минут98.1
5САС, год5
6Длинный диаметр эллипса, км7047

Пусковые характеристики

#ХарактеристикаЗначение
1Код NSSDC2009-041B

Экономические характеристики

#ХарактеристикаДата измеренияЗначение
1Стоимость (аппарат), млн. долл.49.3
2Оператор Emirates Institution for Advanced Science and Technology
3Производитель Satrec Initiative

Информация об удачном запуске

#ХарактеристикаЗначение
1Дата пуска2009-07-29 at 18:46:00 UTC
2Полезная нагрузка 1xDeimos 1
3Полезная нагрузка 1xDubaiSat 1
4Полезная нагрузка 1xDMC 2
5Полезная нагрузка 1xAprizeSat 4
6Полезная нагрузка 1xNanosat 1B
7Полезная нагрузка 1xAprizeSat 3
8Ракета-носитель 1xДнепр

Найдено 166 документов по запросу «DubaiSat 1». [Перейти к поиску]


Дата загрузки: 2017-03-09
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0.21/5
... Spacecraft Electric Propulsion Interaction on DubaiSat-2 using SPIS IEPC-2011-012... this paper, the interaction between DubaiSat-2 and its hall thruster is... software to a commercial satellite, called DubaiSat-2. This satellite is made by... 11 – 15, 2011 II. DubaiSat-2 & Problem Definition DubaiSat-2 is designed as a remote... potential is around 0V. Figure 1. DubaiSat-2 Anode Solar Panel Spacecraft Ground... ions is not significant for DubaiSat-2. Also, the contamination is not... these effects. Most surfaces of DubaiSat-2 are covered with MLI blankets..., whereas the characteristic length of DubaiSat-2 is about 2 meters, this is... orbit limited current collection. For DubaiSat-2, the sizes of current collectors... given for target atoms. In DubaiSat-2, a Silver plated Invar36 alloy is... 0.000607 Table 2. Input parameters for DubaiSat-2 hall thruster Experiment, P=2e-4 torr... in the polar region where DubaiSat-2 fires the thruster, their current... up to critical results for DubaiSat-2, it is still interesting to... interactions between a remote sensing satellite DubaiSat-2, and the Satrec-i Hall thruster...



Дата загрузки: 2017-03-21
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0.13/5
... other satellite projects such as DubaiSat-1 and DubaiSat-2, which at the time... and follow up on the DubaiSat-1 and DubaiSat-2 missions, which revolve around.... We did this when building DubaiSat-1 and DubaiSat-2, and we will do... manufacturing process performed on both DubaiSat-1 and DubaiSat-2 will form the basis... of the team that developed DubaiSat-1, DubaiSat-2 and KhalifaSat. I graduated from the.... During my participation in developing DubaiSat-2 in 2013, I earned my Master... recognisable Dubai shoreline, captured from DubaiSat-2, currently in orbit above the...



Дата загрузки: 2017-03-09
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0.18/5
...: Mapping, Coral Reef, Benthic Habitats, DubaiSat-2, Arabian Gulf ABSTRACT: Coral reefs... the potential of multispectral sensor DubaiSat-2 in mapping benthic communities of... region. 2. 1. INTRODUCTION MATERIAL AND METHODS 1.1 DubaiSat-2 The United Arab Emirates is... the high resolution offered by DubaiSat-2 over Dalma Island (Latitude: 24... studies on the utility of DubaiSat-2 images for marine applications and... environments in the Arabian Gulf. DubaiSat-2 is the 2nd earth observation... orbit of 600 km altitude. DubaiSat-2 provides high-resolution images. Its... on June 18th, 2014 by DubaiSat-2 holds important seafloor features such... McNemar test (Alan, 2002). 3. Figure 2. DubaiSat-2 classification map of Dalma Island...-spatial method CONCLUSION Images from DubaiSat-2 were processed and analyzed using... EAD. These results confirm that DubaiSat-2 has the capability and potential...



Дата загрузки: 2017-03-22
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0.08/5
...,35 and 39 Addition of Dubaisat-2, TH constellation and Kompsat-2, 3 and...-2 INGENIO Oceansat-2 GOSAT ERS-1/2 ERS-1/2 Dubaisat-2 Landsat-5 Landsat-7 Landsat-8 Sentinel-3 * ODIN...-2 PleiadesA/B,GE-1, WV-2, WV-3, Deimos-2, Dubaisat-2 Not yet procured Resourcesat-2 HR1..., WorldView-2, WorldView-3, GeoEye-1, Deimos-2 and Dubaisat- Page 20/84 Copernicus Space... & 1B, 89 large regions o Deimos-2, Dubaisat-2, 17 large regions o WorldView-2, WorldView..., Green, Red, NIR Deimos-2 and Dubaisat-2: Pan, Blue, Green, Red, NIR... or JPG2000 optimized. Deimos-2 and Dubaisat-2 - Level 1B: o system corrected at.... - Radiometric resolution: o Both Deimos-2 and Dubaisat-2 have a bit depth of 10..., VNIR 0.75 m Pan, VNIR 1m DUBAISAT-2 WorldView-1 Pan 0.5 m WorldView-2 Pan, VNIR... m Cartosat-1 Pan 2.5 m Deimos-2 VNIR 4m DUBAISAT-2 VNIR 4m WorldView-3 TIANHUI-1 Pan... constellation Multispectral Both 1,000 1 Deimos-2/ Dubaisat-2 Pansharped, Panchromatic, Stereo, Multispectral Archive...



Дата загрузки: 2017-03-10
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0.18/5
Automated SNR Measurement for High-resolution Satellite Imagery Seungwoo Lee, Satrec Initiative swlee@satreci.com Satrec Initiative • Satellite Manufacturer in South Korea – Satellite platforms – Electro-optical instruments – Ground systems Satrec Initiative • Two satellites were launched – RazakSat-1 – DubaiSat-1 - GSD 2.5m (Pan) 5.0m (MS) • Two additional satellites will be launched – DubaiSat-2 – Deimos-2 - GSD 1.0m (Pan) 4.0m (MS) • Several ground systems for – LEO: KOMPSAT-1, 2, 3, 3A, 5 – GEO: COMS • UAVs in collaboration with Korean Air Satrec Initiative Chicago Midway Intl. Airport DubaiSat-1 Pan sharpened (GSD 2.5m) Image credit: EIAST SNR • SNR is a key index of image quality SNR = Signal m = Noise s Mean Std. • In-flight SNR – On-board Calibration HW – Homogeneous Area Images eg. Natural Target (Dome-C), Artificial Object (Tarp) Dome-C (Wikipedia) AutoSNR • AutoSNR – Measures SNR from normal images taken during EO operation • AutoSNR doesn’t need – Additional HW – Satellite operation • AutoSNR gives – SNR @ various radiance levels – SNR @ every image acquisition SNR Major Challenge Image credit: EIAST AutoSNR Procedure Step 1 Homogeneous Area Detection    Choose start points by Grid sampling Selects nearby pixels having the same DN Includes in-between hole pixels Step 2 SNR @ DN calculation N mij SNRi = å wij s ij j=1 wij = normalize( mij - ci ) Step 3 Fit to Power function   N = num. of blocks in DN=i i = bin index j = block index in i-th bin c = DN bin center The SNR is valid only if N > 10 SNR = a×DNb Suitalbe for modeling SNR and DN in shot noise limited system Homogeneous Area Detector Assumption  If a region is homogeneous, a pixel in it has at least one neighbor pixel which has the same DN value  A pixel surrounded by homogeneous pixels may also be homogeneous but has different DN due to noise Detection Algorithms 1. 2. Flood Fill In-between Hole Filling (101 mask) Homogeneous Area Detector Homogeneous Area Detector Contrast Enhanced for Better Visualization Homogeneous Area Detector Search for nearby regions Fill pixel at (i, j) if the difference of DN from its neighbor pixel. Dv < ws ( w = 0.01×DNmax ) Homogeneous Area Detector Homogeneous Area Detector Homogeneous Area Detector Homogeneous Area Detector Homogeneous Area Detector Homogeneous Area Detector Homogeneous Area Detector And includes in-between holes Homogeneous Area Detector Final Homogeneous Patch Experiments • Experiments – Flat-field Image – Synthesized Image – Flight Image • Image Source – DubaiSat-1 (Pan GSD = 2.5m) – GIS (Pan GSD = 2.5m) Flat-field Image • 21 Flat-field images were generated using an integrator before launch GIS Flat-field Mean ImagesDN (MSB) 2000.0 1500.0 Mean DN 1000.0 Mean DN 500.0 0.0 0 5 10 Image 15 20 Flat-field Image (GIS MSB) * Contrast enhanced for presentation Flat-field Image (GIS MSB) • Horizontal Profile Flat-field Image • NUC (PRNU Correction) was applied Before NUC After NUC Flat-field Image Comparison of of AutoSNR and True SNR Comparison AutoSNR and the truth 300 250 SNR 200 150 100 AutoSNR 50 True SNR 0 0 500 1000 Mean DN 1500 2000 AutoSNR on Synthesized Image • Synthesize an image from 21 flat-field images using probablistic random continuity Flat-field Images Img #1 Img #2 Img #3 Img #21 Mapping of Image AutoSNR on Synthesized Image • Image Synthesis Result AutoSNR on Synthesized Image Comparison AutoSNR Results and truth Truth Comparison of of AutoSNR and the 300 250 200 SNR AutoSNR 150 Truth Power (Truth) 100 50 0 0 500 1000 1500 DN 2000 AutoSNR on DubaiSat-1 Image Image credit: EIAST AutoSNR on Single DubaiSat-1 Image Input Image WORAS_100108054230-1_2_msb.raw.NUC_ImageOnly.png AutoSNR on Single DubaiSat-1 Image DN – SNR Fit to Power function SNR DN WORAS_100108054230-1_2_msb.raw.NUC_ImageOnly.png AutoSNR on 180 DubaiSat-1 Image DN – SNR Fit to Power function SNR DN Conclusion • AutoSNR – Input: Satellite image – Output: DN-SNR table • Experiments – Flat-field Image • Measured SNR was higher than the truth • Homogeneous Detection is likely to include homogeneous pixels rather than noisy pixels – Synthesized Image • Measured SNR was lower than the truth • Noise pixels included by hole filling in homogeneous detection are often really a different object – Flight Image • The SNR plot was linear while it is supposed to have a ^0.5 power function graph • In conclusion… – The homogeneous detection is not working effectively What To Do Next • Improve Homogeneous Area detector – Should not rely on a predefined value (threshold) – Add more natural constraints for homogeneous area modeling • Flatness (plane fitting) • Noise simulation – Simulate various noises • Additive, Multiplicative, Periodic, Impulsive Noises – Verify AutoSNR with noise images Thank you • Any question • Open to any suggestion



Дата загрузки: 2017-04-09
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0.11/5
Deimos-2 cross calibration with Dubaisat-2 Jorge Gil, Alfredo Romo, Cristina Moclán, Fabrizio Pirondini (Elecnor Deimos Imaging); Diego Lozano (Elecnor Deimos Space); Enrique Gonzalez, Jesus Quirce (Elecnor Deimos Satellite Systems) The Deimos-2 Mission Concept  The combined use of DEIMOS-1 (22 m) and Deimos-2 (75 cm) will provide a wide range of capabilities for the generation of products in all optical Earth Observation market segments EOS-D pushbroom camera with multi-linear TDI sensor  75-cm GSD pan-sharpened products  Swath >12 km (24 km in wide-area mode)  Pan (450-900 nm) + 4 bands (R,G,B, NIR)  Radiometric resolution 10 bits       Mass: 300 kg  Size: Ø 1.5 m x 2.0 m  Agile platform (45º across-track)  Developed by EIAST, the Emirates Institution for Advanced Science and Technology (United Arab Emirates) and Satrec Initiative (South Korea)  Dubaisat-2 is an almost exact Deimos-2 twin  Dual redundancy in all critical systems  Xenon gas thrusters (HEPS) for orbit control  X-band antenna for 160 Mbps data transmission  S-band antenna for telemetry & telecommand Owned and operated by EIAST Launched in November 2013. Currently is completing its commissioning phase  Pixel Response and Non-uniformity   Libya-4 LNES (pseudo-invariant) for sensor trending Pixel Saturation 90% 790 890 990 Spectral response 70% 80% MTF Deimos-2 was also characterized for absolute calibration   CIBA (low atmosphere research center) Managed by the University of Valladolid (Spain) Planned to enhance instrumentation to comply with CEOS LES sites 60% 50% 40% 30% 10% 0% 0.4 0.6 0.8 1.0 Wavelength (nm) Libya-4 Tuz Gölu vicarious calibration campaign Deimos-1 image Deimos-1 image Part of the gs4EO suite Fully developed in-house Systematic extraction of calibration data Systematic generation of calibration reports  Interactive  Calibration database Post-launch cross-calibration workflow     Landsat-7 vs Deimos-1 TOA reflectance. Libya-4.  Deimos-2 absolutely calibrated data will be used as reference Data acquired on LNES for sensor trending will be used to cross-compare with Dubaisat-2 Absolute calibration coefficients will be generated for Dubaisat2 based on the data comparison Vicarious validation campaign for the absolute calibrated Dubaisat-2 If the validation campaign is successful, both sensors will be considered absolutely calibrated and validated Dubaisat-2 & Deimos-2 comparison Dubaisat-2 Cross calibration Dubaisat-2 Dubaisat-2 & absolute cal Deimos-2 asessment absolute calibration validated Deimos-2 Deimos-2 Deimos-2 Dubaisat-2 Dubaisat-2 Pre-launch cal data Vicarious cal data LNES data LNES data Vicarious cal data JACIE 2014 - Civil Commercial Imagery Evaluation Workshop Galt House Hotel Louisville, KY, USA March 26-28, 2014 690 100%  Vicarious measurements for absolute Cal/Val using CEOS Land Equipped Sites (LES) and Calibration 590 Wavelength µm   Absolute 490 calval4EO: Centralized management Dark signal measurements using night images over the ocean Deimos-2 20 10 Signal-to-Noise Ratio (SNR) PRNU measurements using uniform and high reflectivity Land Non Equipped Sites (LNES)  30 Instrument spectral response Closely follow CEOS Cal/Val recommendations and sites  40 390 Dark Signal and Non-uniformity  50 20%   60 0 Deimos-2 Post-launch Radiometric Cal/Val  70 Response Linearity   No on-board calibration devices  Light source spectral characterization Both systems have been thoroughly characterized in lab:  During transmission of the stored image data via X-band, data are compressed, encrypted and encoded in real time  High-performance AOCS for pointing accuracy & stability Pre-launch characterization & calibration  Images are stored on a high-capacity solid-state recorder Launch foreseen for Q2 2014 Its brand new facilities, built in Puertollano (Spain) in 2012, include more than 4,000 m2 office space, a 430-m2 clean room and a complete control centre with a 10-m X-band antenna 40-cm Korsch telescope (5.75 m focal length, 1.2º FoV) Ground spatial resolution of 1m Pan, 4m MS The Deimos-2 has been integrated and tested in Elecnor Deimos Satellite Systems premises in Spain in 2013 With Deimos-2, Elecnor Deimos expands its capabilities into satellite integration with the creation of a new subsidiary: Elecnor Deimos Satellite Systems Dubaisat-2   Based on SpaceEye-1 concept (heritage from DubaiSat-1 and -2)  The Payload   It expands Elecnor Deimos Imaging portfolio, complementing DEIMOS-1 with VHR multispectral imagery (75 cm Pan-sharpened)   The satellite is being developed together with Satrec Initiative (South Korea)     Radiance Wm-1µm-1str-1  The Deimos-2 end-to-end system has been designed to provide a cost-effective and highly responsive service to cope with the increasing need of fast access to very-high resolution imagery Transmitance (%)  The Satellite DEIMOS Imaging S.L.U. an ELECNOR company Boecillo, Spain www.deimos-imaging.com



Дата загрузки: 2017-05-20
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0.2/5
... of Pan-sharpening Techniques on DubaiSat-1 images Essa Basaeed, Harish Bhaskar... of pan-sharpening methods on DubaiSat-1 images. DubaiSat-1 is a new satellite and... the main sensor on-board DubaiSat-1 remote sensing satellite. The aim... images with MS images of DubaiSat-1. Section II provides an overview... by DMAC on-board DubaiSat-1 remote sensing satellite. DubaiSat-1 is an Earth... in Table I. Further information about DubaiSat-1 mission can be found at... captured by DMAC on-board DubaiSat-1 (courtesy of EIAST). whereas SQ... a power of two as in DubaiSat-1 images [45]. Furthermore, AWLP specifies... the pan-sharpening method. For DubaiSat-1, nine pan-sharpening methods were... Rais, A. Al Suwaidi, and H. Ghedira, “DubaiSat-1: mission overview, development status and...



Дата загрузки: 2017-02-23
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0.05/5
... 5 - Falcon 9 SAOCOM 1B - Falcon 9 DubaiSat-3 - Dnepr DubaiSat 2 - Dnepr Kompsat 3A - Dnepr Kompsat... by foreign providers, for KOMPSAT-5, DubaiSat-2, and the SWARM constellation, were... 5 Falcon 9 CASSIOPE - Falcon 9 Gökturk 1 - TBD DubaiSat-2 - Dnepr Kompsat 3A - Dnepr Kompsat... DragonLab 1 Falcon 9 SAOCOM 1B Falcon 9 DubaiSat-3 - TBD EnMAP - PSLV SWARM (3) - Rockot...’s Office of Commercial Space Transportation • DubaiSat-2, -3: Two remote sensing satellites, from... 7/13/09 7/29/09 RazakSat DubaiSat 1 Nanosat 1B GOCE SMOS Proba... with DubaiSat 1 DEIMOS and UK DMC 2 deployed on launch with DubaiSat 1 UGATUSAT...



Дата загрузки: 2017-03-28
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0.06/5
... ALOS-PRISM Kompsat-5 Deimos-2 * PAZ Dubaisat-2 AURIGA BLACKSKY constellation Optical HR1...-2 PleiadesA/B,GE-1, WV-2, WV-3, Deimos-2, Dubaisat-2 Not yet procured Resourcesat-2 Proba... & 1B, WorldView-2, WorldView-3, GeoEye-1, Deimos-2, Dubaisat-2 The AOI has been allocated... & 1B, 89 large regions  Deimos-2/Dubaisat-2, 17 large regions WorldView-2, WorldView..., Green, Red, NIR • Deimos-2 and Dubaisat-2: Pan, Blue, Green, Red, NIR... or JPG2000 optimized • Deimos-2 and Dubaisat-2 Level1 (system correction) (L1B): - System... Radiometric resolution: Both Deimos-2 and Dubaisat-2 have a bit depth of 10... n 6.5m resolution, multispectral - DMI Deimos-2/ Dubaisat-2 Pamsharped, Archive Panchromatic. Stereo, New...



Дата загрузки: 2017-05-21
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0.03/5
... 1 - Falcon 9 PAZ - Dnepr Formosat 5 - Falcon 9 DubaiSat-3 - Dnepr Google X PRIZE LM 2C... 1 - Falcon 9 PAZ - Dnepr Formosat 5 - Falcon 9 DubaiSat-3 - Dnepr Google X PRIZE LM-2C... starting in 2016. •• DubaiSat-3: A follow-on to the DubaiSat-2, launched last year.../13 11/21/13 Kompsat-5 DubaiSat-2 SkySat-1 WINISAT-1 Dove 1-4 Dnepr Dnept... 7/13/09 7/29/09 RazakSat DubaiSat 1 Nanosat 1B GOCE SMOS Proba... with DubaiSat 1 DEIMOS and UK DMC 2 deployed on launch with DubaiSat 1 UGATUSAT...