A New Recursive Carrier-Smoothed-Code Filter for Differential Global Navigation Satellite Systems

Motivated both by the advantage of Hatch filter gain over Kalman-type gain in carriersmoothed-code filtering, this paper proposes a position-domain Hatch filter for differential kinematic satellite positioning. In general, position-domain filtering is more attractive than range-domain filtering since less information is lost if changes in the visible satellite set occurs frequently. A new interpretation of the conventional range-domain Hatch filter is presented. The new interpretation is extended to position-domain carrier-smoothed-code filtering, resulting in the position-domain Hatch filter. A simulation result verifies that the proposed position-domain Hatch filter performs better than conventional carrier-smoothedcode filters in cases of frequent satellite constellation changes, and even when there is no satellite set change, due to the synergism between Hatch gain and position-domain filtering.