This receiver comprises a signal processor using the correlation of the received composite signal with early/late, locally generated pseudo-random codes. The code generator sends its signals to a delay line whose evenly spaced out outputs (E2, E1, P, L1, L2) are combined according to the relationship:...http://www.google.de/patents/US5850420?utm_source=gb-gplus-sharePatent US5850420 - Wideband receiver for the measurement of distance by pseudo-random code signals 
