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Low - Rate Information Transmission (LRIT) Prototype Receiver Design

Low - Rate Information Transmission (LRIT) Prototype Receiver Design. Satellite Direct Readout Conference for the Americas Frank Eng, Computer Sciences Corp. December 10, 2002. LRIT Receiver Development Background. Initial NOAA LRIT development study in early 2001

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Low - Rate Information Transmission (LRIT) Prototype Receiver Design

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  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 Satellite Direct Readout Users Conference for the Americas

  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 Satellite Direct Readout Users Conference for the Americas

  4. 1 meter dish Low noise amplifier Down converter Demodulator PC Software CCSDS LRIT processing File handling Viewing Basic Receiver Components Satellite Direct Readout Users Conference for the Americas

  5. Software, CCSDS LRIT Processing • CCSDS PN-deradomization • Reed-Solomon FEC decoding • Level zero processing • Generate traffic statistics • Decompress compressed files Satellite Direct Readout Users Conference for the Americas

  6. Software, File Handling • Receive LRIT files • Store LRIT files • Combine image segments • Retrieve data • Error logging Satellite Direct Readout Users Conference for the Americas

  7. Software, Viewing • Display images and image segments • Overlay latitude and longitude • Zoom • Pan • Thumbnail area display Satellite Direct Readout Users Conference for the Americas

  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 Satellite Direct Readout Users Conference for the Americas

  9. Receiver Specifications • Detailed LRIT receiver specifications are available at NOAA’s 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 Satellite Direct Readout Users Conference for the Americas

  10. The prototype receiver (user terminal) is being demonstrated by Avtec Systems, Inc. in the Exhibit Area Satellite Direct Readout Users Conference for the Americas

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