Patent ID: 11415703

Abstract:
A GNSS receiver has a first antenna and a reference antenna. From the measurement of a carrier phase L1k of GNSS signals at the first antenna and a reference carrier phase L0k at the reference antenna, a single difference L10k is obtained, whereby calculating a double difference L10k0=L10k−L100 between a k-th GNSS satellite and a reference satellite (k=0). The double difference L10k0 is also predicted using known satellite position information as a function of a differencing vector ek0 between a unit line-of-sight direction vector ek of the k-th satellite and that of the reference satellite e0 and a base line vector Δ with a second integer bias N10k0. A real time kinematic (RTK) positioning solution is calculated with ambiguity resolution based on the predicted value of L10k0 and the calculated value of L10k0. A spoofing is detected if the RTK positioning solution yields Δ=0.