Summary

Signal Interference:
Detection and Mitigation

In product development and integration, from board-level GNSS receivers to system-level GNSS receivers in different application platforms


Free 60-Minute Webinar

Date: Thursday, February 2, 2017
Time: 1 p.m. EST / 10 a.m. PST / 7 p.m. CET
Brought to you by: NovAtel

Summary:

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.

Developers, integrators and users need mitigation tools to protect and preserve GNSS measurement quality, maintaining high-quality multi-frequency multi-constellation positioning performance, even in challenging RF environments. This is essential particularly on the integration journey, especially during prototyping and when encountering unforeseen interference events in field testing, in order to produce fully successful integrated products.

The one-hour webinar also will include a follow-up Q&A session with the speakers.

Speakers:

Patrick Casiano
Applied Technology Group, NovAtel
Casiano has responsibility for NovAtel's Applied Technology Group with a mandate to test and evaluate the strengths of products, both proprietary and competing, through tests in vertical segment-specific use contexts. He has led the development of unique projects on single-board computing platforms and integration of mobile IP technology for remote monitoring; streamlined recurring test methodology templates; and applied user experience and customer principles to create specific targeted content to customers in particular phases of their product integration. He has worked at NovAtel since 2003 as applications engineer and technology adoption manager prior to his current position.

Casiano will present an Interference Toolkit that measures RF spectrum levels and allows the user to apply mitigation tools to protect and preserve GNSS measurement quality. This maintains high-quality multi-frequency 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.

A 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. Enabled receivers output a string of easy-to-plot numbers for the user?s software interface, or a software tool displays the spectral analysis output on a PC in real-time.

Rick Hamilton
GPS Information Analysis Team Lead, U.S. Coast Guard Navigation Center
Hamilton is a 36-year career Coast Guardsman, with expertise in ship handling, navigation, buoy positioning, search planning and operations. He returned to Coast Guard duty as a civilian as executive secretariat for the U.S. government?s Civil GPS Service Interface Committee. He serves as GPS information analysis team lead at the U.S. Coast Guard Navigation Center, working directly with the U.S. Air Force Second Space Operations Squadron for provision of civil GPS services. He also is a member of the U.S. delegation to the United Nations International Committee on Global Navigation Satellite Systems, where he co-chairs the Interference Detection and Mitigation Task Force. His work focuses on the impact of disruptions and efforts curb the proliferation of GPS jammers.

Hamilton will explain the proliferation of jammers, aspects of illegal use, coordinated government response to interference events, and regulations to prohibit manufacture, import, export, sale and use of jammers. The NAVCEN at which he works routinely receives interference reports from all over the world. Among other incidents, international airlines have reported complete loss of GPS on air routes over Iran, Moscow and Malaysia. Jammers have been used to disrupt communications during commission of a robbery, in vicinity of a major port, disabling GPS on large cruise ships attempting to dock, and in defeating fleet-tracking devices in company cars and trucks for hijacking of high-value pharmaceuticals.

Kirk Burnell
Core Cards Product Manager, NovAtel
Burnell has worked at NovAtel since 2015. With an education in survey engineering, he has been working with precision GNSS system designers and integrators in both support and product management capacities for more than 20 years.

Burnell will detail applications that stress the importance of high-reliability PNT. Compromised GNSS signals due to unintentional interference is of great concern, but intentional interference due to jamming is much more insidious. Anti-jamming protection via controlled reception pattern antenna (CRPA) technology is now available to a wide range of users. A brief explanation of the technology will be followed by a few use-cases where CRPAs have been deployed in a variety of applications.

Matteo Sgammini
German Aerospace Center
Sgamminireceived a master of engineering degree in electrical engineering in 2005 from the University of Perugia, Italy. He joined the Institute of Communications and Navigation of the German Aerospace Center in 2008. He is currently pursuing a Ph.D. in electrical engineering with research interests in interference mitigation techniques for GNSS. Current research activity includes adaptive filtering, array signal processing and estimation theory for GNSS.

In his presentation, Sgammini will address how researchers equip a GNSS receiver with a diversely polarized antenna array to combine signal processing in the spatial and in the polarization domain. Tests show a significant improvement in receiver robustness against interferences compared with the general single-polarization case. The carrier-to-noise-density ratios of the line-of-sight components are improved since the receiver can use the power present on the left-hand circularly polarized channels, particularly for satellites with low elevation. Interference mitigation improves due to the possibility of filtering in the polarization domain and the additional number of available degrees of freedom.

Moderator:

Alan Cameron
Editor-in-Chief and Publisher, GPS World
Cameron is editor-in-chief and publisher of GPS World magazine, where he has worked since 2000. He also writes the monthly GNSS Design & Test newsletter and the Wide Awake blog.

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