• Title/Summary/Keyword: Satellite Image Data

Search Result 1,187, Processing Time 0.024 seconds

TELEMETRY TIMING ANALYSIS FOR IMAGE RECONSTRUCTION OF KOMPSAT SPACECRAFT

  • Lee, Jin-Ho;Chang, Young-Keun
    • Journal of Astronomy and Space Sciences
    • /
    • v.17 no.1
    • /
    • pp.117-122
    • /
    • 2000
  • The KOMPSAT(Korea Multi-Purpose SATellite) has two optical imaging instruments called EOC(Electro-Optical Camera) and OSMI (Ocean Scanning Multispectral Imager). The image data of these instruments are transmitted to ground station and restored correctly after post-processing with the telemetry data transfeered from KOMPSAT spacecraft. The major timing information of the KOMPSAT is OBT (On-Board Time) which is formatted by the on-board computer of the spacecraft, based on 1Hz sync. pulse coming from the GPS receiver involved. The OBT is transmitted to ground station with the house-keeping telemetry data of the spacecraft while it is distributed to the instruments via 1553B data bus for synchronization during imaging and formatting. The timing information contained in the spacecraft telemetry data would have direct relation to the image data of the instruments, which should be well explained to get a more accurate image. This paper addresses the timing analysis of the KOMPSAT spacecraft and instruments, including the gyro data timing analysis for the correct restoration of the EOC and OSMI image data at ground station.

  • PDF

Fusion Techniques Comparison of GeoEye-1 Imagery

  • Kim, Yong-Hyun;Kim, Yong-Il;Kim, Youn-Soo
    • Korean Journal of Remote Sensing
    • /
    • v.25 no.6
    • /
    • pp.517-529
    • /
    • 2009
  • Many satellite image fusion techniques have been developed in order to produce a high resolution multispectral (MS) image by combining a high resolution panchromatic (PAN) image and a low resolution MS image. Heretofore, most high resolution image fusion techniques have used IKONOS and QuickBird images. Recently, GeoEye-1, offering the highest resolution of any commercial imaging system, was launched. In this study, we have experimented with GeoEye-1 images in order to evaluate which fusion algorithms are suitable for these images. This paper presents compares and evaluates the efficiency of five image fusion techniques, the $\grave{a}$ trous algorithm based additive wavelet transformation (AWT) fusion techniques, the Principal Component analysis (PCA) fusion technique, Gram-Schmidt (GS) spectral sharpening, Pansharp, and the Smoothing Filter based Intensity Modulation (SFIM) fusion technique, for the fusion of a GeoEye-1 image. The results of the experiment show that the AWT fusion techniques maintain more spatial detail of the PAN image and spectral information of the MS image than other image fusion techniques. Also, the Pansharp technique maintains information of the original PAN and MS images as well as the AWT fusion technique.

KITSAT-3 Image Product Generation System

  • Shin, Dong-Seok;Choi, Wook-Hyun;Kwak, Sung-Hee;Kim, Tag-Gon
    • Proceedings of the KSRS Conference
    • /
    • 1999.11a
    • /
    • pp.43-47
    • /
    • 1999
  • In this paper, we describe the configuration of the KITSAT-3 image data receiving, archiving, processing and distribution system in operation. Following the low-cost and software-based design concept, the whole system is composed of three PCs : two for data receiving, archiving and processing which provide a full dual-redundant configuration and one for image catalog browsing which can be accessed by public users. Except that receiving and archiving PCs have serial data ingest boards plugged in, they are configured by general peripherals. This basic and simple hardware configuration made it possible to show that a very low cost system can support a full ground operation for the utilization of high-resolution satellite image data.

  • PDF

Comparison of Visual Interpretation and Image Classification of Satellite Data

  • Lee, In-Soo;Shin, Dong-Hoon;Ahn, Seung-Mahn;Lee, Kyoo-Seock;Jeon, Seong-Woo
    • Korean Journal of Remote Sensing
    • /
    • v.18 no.3
    • /
    • pp.163-169
    • /
    • 2002
  • The land uses of Korean peninsula are very complicated and high-density. Therefore, the image classification using coarse resolution satellite images may not provide good results for the land cover classification. The purpose of this paper is to compare the classification accuracy of visual interpretation with that of digital image classification of satellite remote sensing data such as 20m SPOT and 30m TM. In this study, hybrid classification was used. Classification accuracy was assessed by comparing each classification result with reference data obtained from KOMPSAT-1 EOC imagery, air photos, and field surveys.

HIGH-SPEED SOFTWARE FRAME SYNCHRONIZER USING SSE2 TECHNOLOGY

  • Koo, In-Hoi;Ahn, Sang-Il;Kim, Tae-Hoon;Sakong, Young-Ho
    • Proceedings of the KSRS Conference
    • /
    • 2007.10a
    • /
    • pp.522-525
    • /
    • 2007
  • Frame Synchronization is applied to not only digital data transmission for data synchronization between transmitter and receiver but also data communication with satellite. When satellite image data with high resolution and mass storage is transmitted, hardware frame synchronizer for real-time processing or software frame synchronizer for post-processing is used. In case of hardware, processing with high speed is available but data loss may happen for Search of Frame Synchronization. In case of software, data loss does not happen but speed is relatively slow. In this paper, Pending Buffer concept was proposed to cope with data loss according to processing status of Frame Synchronization. Algorithm to process Frame synchronization with high speed using bit threshold search algorithm with pattern search technique and SIMD is also proposed.

  • PDF

Design and Test Flash-based Storage for Small Earth Observation Satellites (소형 지구 관측 위성용 플래시 기반 저장장치 설계 및 시험)

  • Baek, Inchul;Park, Hyoungsic;Hwang, Kiseon
    • IEMEK Journal of Embedded Systems and Applications
    • /
    • v.13 no.5
    • /
    • pp.253-259
    • /
    • 2018
  • Recently, small satellite industries are rapidly changing. Demand for high performance small satellites is increasing with the expansion of Earth Observation Satellite market. A next-generation small satellites require a higher resolution image storage capacity than before. However, there is a problem that the HW configuration of the existing small satellite image storage device could not meet these requirements. The conventional data storing system uses SDRAM to store image data taken from satellites. When SDRAM is used in small satellite platform of a next generation, there is a problem that the cost of physical space is eight times higher and satellite price is two times higher than NAND Flash. Using the same satellite hardware configuration for next-generation satellites will increase the satellite volume to meet hardware requirements. Additional cost is required for structural design, environmental testing, and satellite launch due to increasing volume. Therefore, in order to construct a low-cost, high-efficiency system. This paper shows a next-generation solid state recorder unit (SSRU) using MRAM and NAND Flash instead of SDRAM. As a result of this research, next generation small satellite retain a storage size and weight and improves the data storage space by 15 times and the storage speed by 4.5 times compare to conventional design. Also reduced energy consumption by 96% compared to SDRAM based storage devices.

Investigation on Tideland Reclamation Projects in North Korea using Satellite Image Data (인공위성 화상자료를 이용한 북한의 간척자원 조사)

  • 조병진;이지근;안기원
    • Proceedings of the Korean Society of Agricultural Engineers Conference
    • /
    • 1999.10c
    • /
    • pp.175-180
    • /
    • 1999
  • The purpose of this study is to investigate on tideland recalamation project as a part of situation on farm land improvement measures in North Korea. By using satelite image data beyond the national boundaries, it makes possbile to analyze tideland reclamation projects, and owing to the developed software and procedure we can analyze data regardless of difference in data acquistion date. Satellite image data LANDSAT JEARS-1 data are mainly used, and analyzing software ER Mapper, ERDAS , IDRISI are used . Reclamation survey result made by the ministry of unification in 1994 were examined by means of remote sensing using satellite image data. The results are ; Completed and/or partly completed project are 24, 596ha and planned are about 142, 223 ha, 166, 819 ha in total. However, they already reported about 300 thousand ha would be reclamined from the sea in early 1980.

  • PDF

The Application of RFM for Geometric Correction of High-Resolution Satellite Image Data (고해상도 인공위성 영상데이터의 기하보정을 위한 RFM의 적용)

  • 안기원;임환철;서두천
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.20 no.2
    • /
    • pp.155-164
    • /
    • 2002
  • In this study, in order to discuss the geometric correction methods of high-resolution IKONOS satellite image, the existing polynomial model and RFM which is able to rectify satellite image without auxiliary data are applied to IKONOS satellite image data. Then the accuracy of ground point versus number of GCPs and each order of RFM are assessed. A numerical instability is removed by application of Tikhonov regularization method. As the results of this study, the root mean square errors of RFM is decreased more than 2 pixels in comparison with the two dimensional polynomial model.

JPEG COMPRESSION PERFORMANCE ANALYSIS OF MTSAT-1R HRIT_LRIT

  • Kim, Tae-Young;Kim, Tae-Hoon;Ahn, Sang-Il;Sa Kong, Young-Bo
    • Proceedings of the KSRS Conference
    • /
    • v.1
    • /
    • pp.286-289
    • /
    • 2006
  • This paper analyzed the JPEG compression performance of MTSAT-1R(Multi-functional Transport Satellite - 1 Replacement), which is offering the LRIT/HRIT(Low Rate Information Transmissio / High Rate Information Transmission) service now, in order to design the system regarding LRIT/HRIT of COMS(Communication, Ocean and Meteorological Satellite). To do so, we analysed Lossy and Lossless JPEG compression performance regarding the MTSAT-1R LRIT/HRIT data for 10 days, and made comparison to the image characteristics, and understood the JPEG compression characteristics regarding JPEG compression of geostationary meteorological satellite. This result of compression performance analysis is expected to be a reference not only to the system design and realization of COMS LRIT/HRIT but also to those who develop other meteorological satellite receiving systems.

  • PDF

JPEG Compression Pereformance Analysis of MTSAT-1R HRIT_LRIT

  • Kim, Tae-Young;Kim, Tae-Hoon;Ahn, Sang-Il;SaKong, Young-Bo
    • Korean Journal of Remote Sensing
    • /
    • v.22 no.5
    • /
    • pp.463-468
    • /
    • 2006
  • This paper analyzed the JPEG compression performance of MTSAT-lR (Multi-functional Transport Satellite-1 Replacement), which is offering the LRIT/HRIT (Low Rate Information Transmissio/High Rate Information Transmission) service now, in order to design the system regarding LRIT/HRIT of COMS (Communication, Ocean and Meteorological Satellite). To do so, we analysed Lossy and Lossless JPEG compression performance regarding the MTSAT-1R LRIT/HRIT data for 10 days, and made comparison to the image characteristics, and understood the JPEG compression characteristics regarding JPEG compression of geostationary meteorological satellite. This result of compression performance analysis is expected to be a reference not only to the system design and realization of COMS LRIT/HRIT but also to those who develop other meteorological satellite receiving systems.