Magellan Systems Japan, Inc.

Toru Kondo

A GNSS receiver has a first antenna and a reference antenna. From the measurement of a carrier phase Lof GNSS signals at the first antenna and a reference carrier phase Lat the reference antenna, a single difference Lis obtained, whereby calculating a double difference L=L&#x2212;Lbetween a k-th GNSS satellite and a reference satellite (k=0). The double difference Lis also predicted using known satellite position information as a function of a differencing vector ebetween a unit line-of-sight direction vector eof the k-th satellite and that of the reference satellite eand a base line vector &#x394; with a second integer bias N. A real time kinematic (RTK) positioning solution is calculated with ambiguity resolution based on the predicted value of Land the calculated value of L. A spoofing is detected if the RTK positioning solution yields &#x394;=0.

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Hyogo, Japan

Toru Kondo