Dual estimate receiver of binary offset carrier modulated signals for global navigation satellite systems

A dual estimate receiver of binary offset carrier (BOC) signals for GNSS applications is described. A unique estimate is derived solely from the code modulation. A more accurate but ambiguous estimate is derived solely from the subcarrier modulation. Any time difference between the two is rounded to the nearest subchip in order to correct the latter estimate. Implementation in the receiver is by a triple digital loop. The full potential accuracy of BOC is then reliably and unambiguously realised.