Patent ID: 6128331
Filing Date: 2000-10-03
Classification: H04B

Abstract:
A direct sequence correlation system, comprising:first means for receiving an RF signal and generating analog in-phase (I) and quadrature (Q) signal components;second means for receiving and digitizing said I and Q signal components;a high precision correlation circuit for receiving said digitized I and Q signal components, generating a high precision correlation function of said I and Q signal components, and providing signal demodulation thereof;a low precision correlation circuit for receiving said digitized I and Q signal components, generating a lower precision correlation function of said I and Q signal components than said high precision correlation circuit, and providing code search and code tracking for a PN code associated with said RF signal;a precision conversion circuit interposed between said second means and said low precision correlation circuit, said precision conversion circuit formatting said I and Q signals for processing by said low precision correlation circuit; anda synchronization processor interposed between said high and low precision correlation circuits, said synchronization processor controlling said high and low precision correlation circuits, and synchronizing said high precision correlation circuit with said PN code.