I3E Technologies, #23/A, 2nd Floor SKS Complex, Opp. Bus Stand, Karur-639 001. IEEE PROJECTS AVAILABLE, NON-IEEE PROJECTS AVAILABLE, APPLICATION BASED PROJECTS AVAILABLE, MINI-PROJECTS AVAILABLE.

1. GNSS CARRIER PHASE ANOMALY DETECTION AND VALIDATION FOR
PRECISE LAND VEHICLE POSITIONING
ABSTRACT
A carrier phase anomaly detection and validation method is proposed for precise vehicle
positioning in dynamic environments. Given that carrier phase measurement is affected by
satellite and user dynamics as well as unexpected anomalies, we propose four sequential
processes to detect and identify an anomaly: 1) dynamics separation; 2) anomaly detection; 3)
validation; and 4) position domain test. First, terms related to the satellite and user dynamics are
estimated individually and removed from the carrier phase measurement to yield an error term,
which possibly includes an anomaly and should be detected. The error term is examined with
respect to a threshold level, and the measurement values are divided into anomaly candidates and
normal candidates. Anomaly candidates are reexamined and validated one-by-one using a normal
measurement set and the anomaly is determined. Finally, the position domain is evaluated so that
position errors can be used as additional criteria for detecting the anomaly attributed to satellite
deployment. The proposed algorithm is verified by simulation analyses and an experimental test.
The proposed methods can be effective in detecting anomalies and increasing the reliability of
precise vehicle positioning.