GPS World, January 2012
Signal Processing SECURITY WIRELESS FIGURE 5 The shortest broadcast signature block that does not violate the CNAV ephemeris and timing broadcast requirements To meet the required broadcast interval of 48 seconds for message types 10 11 and one of 30 39 the ECDSA signature is broadcast over a 96 second signature block that is composed of eight CNAV messages FIGURE 6 A signed 336 second broadcast The proposed strategy signs every 28 CNAV messages with a signature broadcast over two CNAV messages on each broadcast channel www locatacorp com This is not the end It is not even the beginning of the end But it is perhaps the end of the beginning Winston Churchill describing Locatas finest hour HISTORY REPEATS ITSELF GPS REBORN YOUR OWN GPS The Local Constellation is launched ION 2011 The trademarks Locata GPS 20 Your Own GPS and Local Constellation are registered to Locata Corporation www gpsworld com January 2012 GPS World 61
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