Patent ID: 6272174
Filing Date: 2001-08-07
Classification: G01S

Abstract:
A method for increasing signal acquisition in a radio frequency receiver, comprising:receiving a continuous-time radio-frequency signal;sampling the continuous-time radio-frequency signal at a reduced sampling interval to produce a discrete time signal, the reduced sampling interval being a predetection interval;processing the discrete-time signal with a banked filter to produce multiple signal outputs at multiple frequency bins, wherein each of the multiple signal outputs comprises in-phase and quadrature components of the discrete-time signal;combining the in-phase and quadrature components of at least two of the multiple signal outputs, using at least one of addition and subtraction, to produce coherent sums over the predetection interval for two or more frequency bins;providing a post-detection interval;detecting power of said coherent sums for said two or more frequency bins; andsumming power values from the detecting step during the post detection interval,thereby producing a wide range of frequency coverage while maintaining lower attenuation of the signal between the bins such that no multiplication of the multiple signal outputs is required,summing power values from said detecting step during the post detection interval.