Patent ID: 9184973
Filing Date: 2015-11-10
Classification: G01S,H04B,H04L

Abstract:
1. A method for receiving a received composite signal, the method comprising: receiving a composite signal, comprising binary offset carrier (BOC) modulated signals, to extract a BOC component by combining with a local BOC replica, and to derive a quadrature BOC (QBOC) component by combining with a local QBOC replica, the BOC component comprising an in-phase BOC component and a quadrature-phase BOC component, the QBOC component comprising an in-phase QBOC component and a quadrature-phase QBOC component; detecting a primary amplitude of the BOC component of the received composite signal based on the correlation data; detecting a secondary amplitude of the QBOC component of the received composite signal based on correlation data; determining whether the primary amplitude exceeds the secondary amplitude for a sampling period; selecting a set of BOC correlations in accordance with a BOC correlation function for the sampling period if the primary amplitude exceeds or equals the secondary amplitude for the sampling period; and selecting a set of QBOC correlations in accordance with a QBOC correlation function for the sampling period if the secondary amplitude exceeds the primary amplitude for the sampling period; and processing the selected correlations to track a carrier of the received composite signal for estimation of a range between a receiver antenna and a satellite transmitter that transmits the received composite signal.