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

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

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 “ 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