Patent ID: 6029044
Filing Date: 2000-02-22
Classification: H04B,H04H

Abstract:
A method of detecting a satellite signal having a plurality of staggered transponder signals with differing characteristics and having an rf noise frequency component and a service frequency component, said method comprising:establishing at least a first threshold value;developing a first value indicative of an rf noise frequency component and a second value indicative of a service frequency component from the satellite signal, wherein the rf noise frequency component and the service frequency component are spectrally separate and said rf noise frequency component comprises at least predominantly out-of-band rf noise signals and said service frequency component comprises at least predominantly service signals, and wherein said service frequency component is derived from a band of frequencies common to at least a first transponder signal having one characteristic, and a second transponder signal having a different characteristic;deriving a difference signal value from said first and second values;comparing the difference signal value with said at least a first threshold value; andgenerating a first output if the difference signal value differs from said at least a first threshold value in a predetermined manner.