GPS World, January 2017
Signal Interference Detection and Mitigation I n a perfect world the signal from a GNSS satellite arrives at the antenna with no loss of integrity for a perfect measurement This essential over the air connection between satellite and antenna can degrade due to signal interference Legally operated radios and other nearby electronics can interfere unintentionally As the number of GNSS signals being tracked increases so does the potential for interference to dismiss the performance gains of using those additional signals To maximize performance and efficiency prepared PNT users need their equipment to be able to detect when interference is present and mitigate it NOVATEL INTERFERENCE TOOLKIT To combat interference NovAtel has developed the Interference Toolkit The OEM7 receiver will measure the RF spectrum levels and allow the user to apply mitigation tools to protect and preserve the GNSS measurement quality This maintains high quality multifrequency multi constellation positioning performance even in challenging RF environments The tool kit makes itself an essential part of the integration journey especially during prototyping and unforeseen interference events in fielded integrated products The built in spectrum analysis tool outputs data just like a spectrum analyzer Signal level is plotted against frequency to show how much signal power is being sensed across different GNSS frequency bands Interfering signals can be easily identified OEM7 receivers output a string of easy to plot numbers for your own software interface or NovAtels free Connect software tool displays the spectral analysis output on a PC in real time Users can deploy the OEM7 s onboard signal processing and digital filtering to mitigate interference allowing the GNSS signals to be tracked with both the receiver and the PNT user to continue to operate normally through an interference event Patrick Casiano Applied Technology Group Lead BY Patrick Casiano Use the built in spectral analysis tool in every OEM7 receiver to see interference and employ mitigation techniques JANUARY 2017 WWW GPSWORLD COM GPS WORLD S3
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