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US 9,184,973 B2Granted
Method and receiver for receiving a binary offset carrier composite signal
AssigneeDeere & Company
InventorsWei Yu, Richard G Keegan
Life of this patent
Estimating the term…
Abstract
A data processor selects 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. The data processor selects 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. The data processor uses either the BOC correlation function or the QBOC correlation function, whichever with greater amplitude, at each sampling period to provide an aggregate correlation function that supports unambiguous code acquisition of the received signal.
Claims34
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.
6 more elements
A system for receiving a received composite signal, the system comprising:
- a receiver front end for receiving a composite signal comprising binary offset carrier (BOC) modulated signals;
- a first signal generator for generating a chip replica for any sampling period;
- a second signal generator for generating a local BOC replica or a quadrature BOC replica for any sampling period;
- an electronic data processor adapted to extract a BOC component by combining with the local BOC replica and to derive a quadrature BOC (QBOC) component by combining with the local QBOC replica, the BOC component comprising an in-phase BOC component and a quadrature-phase BOC component, the QBOC component comprising in-phase QBOC component and a quadrature-phase QBOC component;
- a first detector for detecting a primary amplitude of the BOC component of the received composite signal based on correlation data;
- a second detector for detecting a secondary amplitude of the QBOC component of the received composite signal based on the correlation data;
- an evaluator of the data processor determining whether the primary amplitude exceeds the secondary amplitude for a sampling period;
- a selector of the data processor for 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
- the selector is adapted to select 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 wherein the selected xBOC correlations with greater amplitude supports unambiguous code acquisition of the received signal;
- where xBOC means BOC or QBOC;
- and
- a tracking module of the electronic data processor for 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.
10 more elements
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 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 correlation data;
- detecting a secondary amplitude of the QBOC component of the received composite signal based on the correlation data;
- determining whether the primary amplitude exceeds the secondary amplitude for a sampling period;
- selecting a set of early, prompt and late 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 early, prompt, and late 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 a first subset of the selected set of 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.
6 more elements
Dependencies are inferred from the claim text.