GNSS Code Tracking in Presence of Data

After the acquisition stage of a GNSS receiver has roughly synchronized the received and the locally generated codes typically within less than a half chip period residual offset, a fine synchronization stage, named signal tracking, takes over and continuously maintains and corrects the best possible alignment between the two codes by means of closed loop operations. In this paper, we mainly consider the navigation data sign transition problem present in a code tracking loop. In order to overcome this problem, a novel Assisted-GNSS (A-GNSS) based code tracking technique has been proposed to deal with the data sign transitions present in the code tracking loop of a GNSS receiver in order to enhance the tracking performance. The performance improvement of this proposed tracking technique has been proved by means of simulation analysis. This proposed technique mitigates the data sign transitions impact occurring in the code tracking loop by proving assistance data which enables signal tracking more robust in challenging environments.