Raytheon’s ADS-B unit cuts down on | Aviation International News

Raytheon’s ADS-B unit cuts down on

Raytheon Systems Limited (RSL) has unveiled a new automatic dependent surveillance-broadcast (ADS-B) receiver that uses a 16 MHz or better sampling rate, a

By Bernard Fitzsimons

February 5, 2007

Raytheon Systems Limited (RSL) has unveiled a new automatic dependent surveillance-broadcast (ADS-B) receiver that uses a 16 MHz or better sampling rate, a new algorithm and enhanced error correction to decode 1,090-MHz extended squitter transmissions correctly even in the presence of extreme frequency congestion.

The 1,090-MHz frequency is already crowded with transponder replies to secondary surveillance radar (SSR) interrogations, TCAS squitters, TACAN and DME interrogator transmissions and out-of-band interference from primary radars, DMEs and other emitters, resulting in the phenomenon of false replies unsynchronized in time, otherwise known as fruit.

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