Low - Rate Information Transmission (LRIT) Prototype Receiver Design - PowerPoint PPT Presentation

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Low - Rate Information Transmission (LRIT) Prototype Receiver Design

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Satellite Direct Readout Conference for the Americas. Frank Eng, Computer Sciences Corp. ... Satellite Direct Readout Users Conference for the Americas. 4 ... – PowerPoint PPT presentation

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Title: Low - Rate Information Transmission (LRIT) Prototype Receiver Design


1
Low - Rate Information Transmission
(LRIT)Prototype ReceiverDesign
  • Satellite Direct Readout Conference for the
    Americas
  • Frank Eng, Computer Sciences Corp.
  • December 10, 2002

2
LRIT Receiver Development Background
  • Initial NOAA LRIT development study in early 2001
  • Initial LRIT receiver specification development
  • LRIT prototype receiver development begun in mid
    2001
  • LRIT prototype receiver development completed in
    November 2002
  • LRIT prototype receiver design and software will
    be made available

3
LRIT Receiver Design Considerations
  • Performance Reliable RF reception for 10-8 BER
  • WEFAX RF compatibility
  • CGMS compatibility (CCSDS)
  • Basic receive processing
  • Basic data management
  • Basic viewing
  • Value added S/W capability
  • Cost

4
Basic Receiver Components
  • 1 meter dish
  • Low noise amplifier
  • Down converter
  • Demodulator
  • PC
  • Software
  • CCSDS LRIT processing
  • File handling
  • Viewing

5
Software, CCSDS LRIT Processing
  • CCSDS PN-deradomization
  • Reed-Solomon FEC decoding
  • Level zero processing
  • Generate traffic statistics
  • Decompress compressed files

6
Software, File Handling
  • Receive LRIT files
  • Store LRIT files
  • Combine image segments
  • Retrieve data
  • Error logging

7
Software, Viewing
  • Display images and image segments
  • Overlay latitude and longitude
  • Zoom
  • Pan
  • Thumbnail area display

8
LRIT Receiver Specifications
  • 1691 MHz L-band receiver
  • 1 meter antenna, G/T 0.3 dB
  • Modulation PCM/NRZ-L/BPSK
  • Data rate 128 kbps 293 k-symbols/s
  • CGMS (CCSDS) LRIT data format
  • JPEG and Rice compression

9
Receiver Specifications
  • Detailed LRIT receiver specifications are
    available at NOAAs WEFAX web site
  • http//noaasis.noaa.gov/WEFAX/
  • see the LRIT Report - Part 3
  • Final detailed LRIT receiver specifications
    will be available after system integration
    test in January 2003

10
  • The prototype receiver
  • (user terminal) is being demonstrated by
  • Avtec Systems, Inc.
  • in the Exhibit Area
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