A near real-time GPS interference detection system in the United States using the national CORS network
Weston, Neil et al.
The National Geodetic Survey, NOAA, routinely collects data in the Receiver Independent Exchange Format (RINEX) from approximately 1400 CORS stations to support numerous surveying, engineering and scientific applications. These data are collected continuously and packaged into hourly and daily files. In this study, we investigate the feasibility of using the National CORS Network in the United States as a means to detect temporary GPS interference on a regional basis. To evaluate the GPS interference detection system, hourly RINEX files from numerous CORS stations were processed, shortly after they were collected, to compute positions on an epoch-by-epoch basis. The computed epoch positions, along with the mean position for each hour of data submitted, were then compared to the accepted or published values. A time series of position estimates for each of the CORS stations was then analyzed to identify outliers and to determine if a significant change from the accepted position was observed. The time series positions were plotted to also aid in identifying any trends which may be occurring at the CORS stations. The initial results from this investigation show that it is possible to identify if a CORS, or any permanent reference site, is experiencing temporary, regional interference which results in the receiver losing lock for some period of time. The latency between the times when the receiver data were collected and the interference was identified was typically one hour. The long term goal of this project is to make the GPS data from the National CORS Network available in real time, thereby supporting epoch-by-epoch position monitoring.
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