GPS multipath detection based on sequence of successive-time double-differences

Based on a sequence of successive-time double-differences of pseudorange and carrier phase measurements provided by the Global Positioning System (GPS), a channelwise test statistic is proposed. The proposed test statistic is particularly efficient in multipath detection and operationally advantageous: it requires only basic observables, it requires no precomputation of receiver position, it has standard χ²-distributions, and it can reduce the detection resolution by increasing the number of successive measurements. To analyze the proposed test statistic, both minimum detectable jump and minimum detectable ramp are derived. An experiment under an intentional multipath environment exhibits the effectiveness of the proposed test statistic.