Real-time high-precision GPS positioning and navigation requires that cycle-slip in the undifferenced carrier-phase
measurements can be detected instantaneously. A slip of only a few cycles can bias measurements enough to make
centimeter-level positioning or navigation difficult. Over the past decade a number of methods have been developed to
detect and repair cycle slips. The majority of methods invariably are used in the post-processing cycle-slip detection. A
method has been developed from various exiting techniques, that provides real-time cycle-slip detection (i.e., using only
current epoch's GPS carrier-phase measurements). The approach utilizes two linear combinations, the Geometry-free and
the Melbourne-Wübbena combination. The low degree polynomial fitting and running-average filter are used to detect
cycle slips. Simulation tests are conducted to the kinematic data. Results indicate that single-cycle slips can be reliably
detected instantaneously.
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