IMPROVED IMPLEMENTATION TECHNIQUE FOR DIGITALLY PHASE-CODED SYSTEMS
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2002-Feb-28
This publication describes an implementation technique that is a key element in improving the rejection of unwanted uncorrelated signals in digitally phase-coded radars and communications systems, The principles involved will be explained using a widely used phase coded correlation radar applica- tion which uses a maximal length pseudorandom- noise (PN) code sequence! hereafter refered to as a PN code or PN code sequence. The commonly accepted limit for the rejection of these unwanted uncorrelated signals is 1010g(r/L2) B, where L is the length of the PN code sequence, which is based on the underlying autocorrelation properties of the PN code being used. However, many applications have generated requirements for the rejection ofuncorre- lated signals, hereafter called out-of-range rejection (ORR), beyond this limit.