A joint precise point positioning and attitude determination with tight coupling of two single-frequency low-cost GNSS receivers and an inertial sensor is described. The sensor fusion is performed with an extended Kalman filter. A code multipath state parameter is determined for each satellite to exploit time correlation of multipath. A synchronization correction is derived to restore the integer property of ambiguities. Satellite phase biases and vertical ionospheric delays are additionally determined by a local network.
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