The prospect of tracking two signals on different carrier frequencies as one wideband signal is often referred to as meta-signal tracking. The general interest in meta-signals is derived from the fact that the correlation function of such a signal consists of a narrower main peak than the correlation functions of its constituent signals which implies that with an adapted signal tracking architecture, such as the Double Estimator, the meta-signal can be tracked with small tracking jitter and better multipath rejection performance ultimately producing position solutions with improved accuracy. To validate and demonstrate this, as part of FUNTIMES2 Horizon 2020 (H2020) RD Framework project, a complete GNSS processing chain is employed which consists of a fully realistic bit-true GNSS signal generation done at the IF sample level, GNSS SDR processing and positioning using an engine that implements an adapted LAMBDA ambiguity fixing method. The signal generation is done using PIPE simulation tool chain from Airbus Defence and Space GmbH with an assumed signal structure. The LAMBDA-method is adapted to resolve sub-carrier ambiguities by implementing a Kalman filter which uses code and sub-carrier pseudorange measurements which are obtained from a PIPE-generated RINEX observation file and are used to update the filter state-vector at each epoch. The filter produces a float solution, which is passed onto a dedicated LAMBDA ambiguity resolution block to produce a fixed solution, which is then conditionally used to update the estimated receiver position with accuracy up to the cm level.     «

The prospect of tracking two signals on different carrier frequencies as one wideband signal is often referred to as meta-signal tracking. The general interest in meta-signals is derived from the fact that the correlation function of such a signal consists of a narrower main peak than the correlation functions of its constituent signals which implies that with an adapted signal tracking architecture, such as the Double Estimator, the meta-signal can be tracked with small tracking jitter and bett...     »