Inside GNSS Media & Research

MAR-APR 2018

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Page 38 of 67 M A R C H / A P R I L 2 0 1 8 InsideGNSS 39 the technology helped with customers in India, Calgary and Japan. The ITK provides any operator on-demand actionable intelligence by measuring the radio frequency spectrum levels, making it much eas- ier and faster to visualize, monitor, quantify and even mitigate interference sources that commonly impact receiver performance. In one case, the ITK helped identify a weath- er station antenna as the source of interference troubling a customer in A ssam, India . The customer had been troubled by GNSS disrup- tions each night before a NovAtel technician was able to use the ITK at night, determine the cause of interference, and recommend re- locating the weather antenna which solved the problem. BY THE NUMBERS » PARTICIPANTS´ VIE S In another case, the ITK determined that a v ideo transmitter intended for UAVs was inter fer ing w ith GNSS sig na ls in Ca lgar y. Additionally, ITK was used to help complete a successful demonstration of an SAE Level 4 autonomous vehicle in Tokyo. Use of the ITK helped identify and monitor any potential in- terference issues that could have kept the ve- hicle from performing the way it should. "The goal is to visualize the interference so that it is easier to understand where the inter- ference is coming from and find the source of the interference," Alves said. "The plan is to use the received power levels to estimate the location of the interference." FINAL THOUGHTS Kennedy noted that it's often an unintentional interference that can create problems for GNSS users, but added, "Really it doesn't matter what the intention of the interference is, the effect on your performance is the same." That's why it is important to maintain the best possible environment you've got, and that you control your GNSS performance. "It may manifest in fairly subtle ways but as you move into more difficult conditions you'll definitely notice things like a much longer time to signal acquisition or reacquisition or possibly never even acquiring a signal," she said. "Then that plays into a longer time to a first RTK fix, or a PPP convergence or reconvergence time." Because of this, taking advantage of ITK and its benefits is something GNSS users should cer- tainly consider. "So again, interference is something that we knew was a concern when we planned OEM7. And the Interference Toolkit is built into every single receiver as a result," Kennedy said. The "Applying GNSS Interference Detection Inside and Out" webinar took place in January and can now be viewed on-demand at: https://register.gotowebi- Which of the following are you concerned about: Please select all that apply Would having these options on your receiver influence your receiver purchasing decision? Select one Intentional/malicious jamming 54% General wireless communication interference 53% Self-induced system interference 35% Another type of interference not mentioned above 15% None 1% Interference Detection 11% Interference Mitigation 9% Both 74% Neither 6% HAVE YOU EXPERIENCED INTERFERENCE BEFORE? YES 70 % No 12 % Not sure 18 % ▼

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