GPS Innovation Alliance Lobbying Congress On 1dB Standard

On Friday, Oct. 16, 2015, the GPS Innovation Alliance (GPSIA) submitted two filings regarding federal spectrum policy. Comments were filed in response to a public notice in the U.S. Department of Transportation’s (DOT) GPS Adjacent Band Compatibility assessment, and testimony was submitted for the record to a U.S. House Energy and Commerce subcommittee in response to its recent hearing, “Improving Federal Spectrum Systems.” Both filings stressed that the “1 dB standard” is the appropriate criterion for testing the compatibility of terrestrial broadband and GPS operations.

The GPS Innovation Alliance has consistently supported the more complete use of underused spectrum where technically feasible. In both filings, GPSIA expressed support for each government entity’s ongoing efforts and stressed the importance of protecting GPS, one of the country’s most important and ubiquitous national utilities.

Regarding the DOT effort, GPSIA offered suggestions relating to certain aspects of the proceeding and voiced support for the “1 dB standard” in testing – which would determine Adjacent Band Masks based on a measurement of received interference test signal power levels that cause a 1 decibel (dB) degradation in the receiver’s Carrier-to-Noise Density Ratio. As outlined in GPSIA’s comments, the organization’s support for the 1 dB standard is based on its long and well-established history in international and domestic regulatory proceedings and difficulties associated with other standards.

GPSIA wrote: “While DOT has proposed recording other performance metrics, such as loss of signal lock or degradation of pseudo-range or position accuracy, GPSIA believes these are inappropriate metrics for interference assessment since their inherent basis is an interference level that seriously degrades the RNSS spectrum environment and causes significant disruption to GPS receivers.”

Degradation of accuracy or otherwise attempting to determine effects on the “user experience” are not practicable interference metrics, and DOT should rely upon the 1 dB protection criteria in derivation of the Adjacent Band Masks. GPS receivers are used in a tremendous range of end user applications beyond simple navigation. It is unclear how it would be possible to determine whether there has been “material degradation” in the functioning of this wide range of GPS applications, much less what constitutes degradation that is “material.”

GPSIA also submitted testimony for the record in response to an Oct. 7 hearing by the House Subcommittee on Commerce and Technology, where the potential for repurposing spectrum currently reserved for use by satellite applications for terrestrial broadband was discussed, but without addressing the difficult technical challenges associated with repurposing satellite spectrum.

A key theme raised in the GPSIA testimony is support for allocating similar uses for spectrum in close proximity to each other. Doing so is an approach that is preferable to adopting receiver standards. GPSIA also explained the unique technical differences between communications and navigation spectrum use.

“A straightforward approach is to minimize the number of dissimilar spectrum applications in close spectral proximity to each other,” GPSIA said. “Put another way, similar spectrum uses should be grouped together to the greatest extent possible to minimize the number of band edges or ‘border areas’ where dissimilar uses in close proximity create serious interference challenges. This approach minimizes the need for the FCC to engage in extensive rule making to balance the interests of dissimilar spectrum uses in every spectrum ‘border’ area.”

GPSIA then noted that “attempts to attribute Global Navigation Satellite System (GNSS) interference issues mainly to poor receiver design are misguided. The FCC has long understood that receivers designed to receive one set of frequencies can be ‘overloaded’ by transmissions in adjacent frequencies.”

In fact, overload interference is not unique to GPS, whose receivers are typically designed to withstand adjacent band transmissions hundreds of millions of times stronger than GPS signals and compare favorably to other common types of mass market receivers.

GPSIA again voiced support for the 1 dB standard for testing, explaining that communications systems operate above the noise floor spectrum while GPS signals are below the thermal noise floor when they are received.

“Because GNSS operates below the noise floor, the most appropriate means by which to assess the potential of new adjacent band systems is whether the new service causes a 1 dB degradation in a receiver’s Carrier-to-Noise Ratio.” Other interference metrics, the GPSIA explained, “are based on interference levels that seriously degrade the GNSS spectrum environment and will cause devastating disruption to GPS receivers.”

“Use of a 1 dB standard is vastly superior to an approach that attempts to assess whether there is ‘actual’ harm to an incumbent service, which wrongly assumes that you can accurately predict the impact of a new service across a heterogeneous series of devices in adjacent spectrum. Defining harmful interference by reference to a level of degradation to a particular key performance indicator among a limited universe of devices and applications fails to account for and support future innovation, including known and currently unknown applications which could take advantage of ever increasing accuracy of the position, navigation and timing functions of GPS. Use of a defined change in the noise floor (1 dB) provides a readily identifiable and predictable metric that all interested parties can take into account now and in the future.”

GPSIA’s testimony concluded by urging policy makers to engage in “rational, long term spectrum planning,” noting that a focus solely on regulation of receiver characteristics is likely to have limited usefulness and may be inefficient and harmful to continued innovation in affected spectrum uses.

Topics:

Leave a Reply

Guidance Stories
GuidanceTrimble Launching VerticalPoint RTK for FmX, TMX-2050 Displays
December 19, 2016
Trimble announced today that it has launched a world-first, patent-pending VerticalPoint RTK system for grade control in agriculture. VerticalPoint RTK Read More
GuidanceNovAtel Launches RTK ASSIST Service
October 11, 2016
Today at Intergeo, NovAtel introduced its RTK ASSIST service. RTK ASSIST is a subscription-based service that provides users with satellite-delivered Read More
AgJunction, InfoAg 2014, Autosteer, GPS
GuidanceAgJunction, TeeJet Technologies Form Partnership
July 6, 2016
AgJunction Inc. and TeeJet Technologies, one of the world’s leading application technology providers for agriculture, have entered into a global Read More
GPS, Guidance
GuidanceDeere Launches Plethora of Precision Ag Products
June 1, 2016
Two new row guidance products available for John Deere sprayers Two new AutoTrac products are available to help row crop Read More
Trending Articles
PrecisionAg.com featured image
ProfessionalsWelcome to the Newly Enhanced PrecisionAg.com
December 29, 2016
Talk a quick look around our website and we hope you’ll notice it’s significantly different as we head into 2017 Read More
Ryan Raguse and Matthew Grassi
ProfessionalsIndustry Executives Talk New PrecisionAg Professional Brand
December 19, 2016
EFC Systems President and CEO Ernie Chappell Myriad Mobile Cofounder and Chairman Ryan Raguse Read More
PrecisionAg Professional logo
Industry NewsMeister Media Debuts PrecisionAg Professional
December 13, 2016
Agricultural technology is accelerating, and precision agriculture is gaining renewed interest across cropping systems. At the same time, growers are Read More
NDSU IoT
Sensors/IoTNew Farming Focused IoT Partnership Announced
December 13, 2016
Infiswift, an enterprise Internet of Things (IoT) platform developer, announces a partnership to develop IoT solutions with Acuitus Ag, an Read More
GVM E-Series cab
Ag Tech GlobalGlobalization And Precision Agriculture
December 7, 2016
Globalization has taken on a negative connotation in some circles in the U.S. in recent months. The lightning rod for Read More
Farmers Edge Truck
Data ManagementFarmers Edge, Trotter Fertilizer Form Partnership To Enhance VRT Programs
November 29, 2016
Farmers Edge, a global leader in precision agriculture and independent data management solutions, has partnered with Trotter Fertilizer, Nebraska’s foremost Read More
Latest News
Ag Weather Service
Decision Support SoftwareSciFi in Ag: Will Amazon’s Alexa Control the Fami…
January 19, 2017
*Article Notes: This monthly column takes some crazy sounding ideas and applies them to the field of Ag Tech. The Read More
Data ManagementNew Partnerhship Between AgIntegrated, CDMS, SeediQ Wil…
January 18, 2017
AgIntegrated, Inc. (AGI), CDMS, Inc. and SeediQ announce a partnership to develop, promote, and sell a single-source crop input reference Read More
Corn Field Sunset
Ag Tech GlobalAg Technology Among Focus Areas For Kohli Impact Invest…
January 18, 2017
Tej Kohli, a serial entrepreneur, global businessman and philanthropist, has announced he has earmarked an initial $25 million USD, through his Read More
Terry Griffin
Business ManagementUsing High Tech To Make Farm Decisions
January 17, 2017
Raj Khosla, professor of precision agriculture at Colorado State University, challenged farmers to think about how far the technology of Read More
Decisive Farming My Farm Manager mobile app
Ag Tech GlobalLeading Canadian Farming Co-op Brings In New Tech To Bo…
January 17, 2017
Co-op, one of the largest agricultural retailers in Western Canada, is partnering with farm management company Decisive Farming to provide Read More
Business ManagementCNH Names Danford Industry Relations Manager
January 17, 2017
Dan Danford has been named Industry Relations Manager, Precision Solutions and Telematics (PS&T), for CNH Industrial, parent company of agricultural Read More
Australian Harvest
Ag Tech GlobalAustralian Precision Agriculture Market, Forecast To 20…
January 13, 2017
Research and Markets has announced the addition of the “Australian Precision Agriculture Market, Forecast to 2020” report to their offering. Read More
Norris planter
Innovation SeriesCompelling Consultant Panel Kicks Off Next Month’s Prec…
January 12, 2017
Jeremy Wilson, Technology Specialist at CropIMS and renowned precision expert, leads a panel of top precision consultants to kick off Read More
Data ManagementProspera Selected for Top 100 Artificial Intelligence R…
January 11, 2017
CB Insights today selected Prospera to the prestigious Artificial Intelligence 100 list (“AI 100”), a select group of emerging private Read More
Business ManagementBREAKING: FAA Considering Less Restrictive Commercial D…
January 11, 2017
FAA is working toward allowing more freedom for drone operators, and at the same time is working with NASA on Read More
DronessenseFly, Agribotix Combine eBee SQ and FarmLens Offeri…
January 11, 2017
Agribotix has partnered with senseFly to offer a new combined solution for professional users. This technology solution combines the top Read More
Sentera software
DronesSentera Announces NDVI Livestream Capabilities for Doub…
January 10, 2017
Sentera today announced the upcoming release of LiveNDVI Video: livestreamed NDVI video via Sentera’s Double 4K sensor. This breakthrough technology Read More
Young Corn Field
Ag Tech GlobalEurocontrol To Commercialize Precision Agricultural Ini…
January 9, 2017
Eurocontrol Technics Group Inc., a Canadian public company specializing in the acquisition, development and commercialization of innovative test and measurement Read More
Corn Field
Data ManagementWaypoint Analytical, Highland Precision Ag Announce Str…
January 9, 2017
Waypoint Analytical (WP), based in Memphis, TN, and Highland Precision Ag (HPA), based in Mulberry, FL, are pleased to announce Read More
Western Canada Wheat field
EventsSixth Annual Precision Ag Summit Set for January 16-17 …
January 4, 2017
The 6th annual Precision Ag Summit will be held Jan. 16-17, at the North Dakota Farmers Union Conference Center in Read More
University of California Merced Professor Stefano Carpin
Hort TechRobots, People Working Together To Save Water, Enhance …
January 3, 2017
A nearly $1 million grant from the USDA is helping University of California researchers refine collaborative robotic technology that could Read More
Wade Barnes Farmers Edge using FarmCommand
Data ManagementFarmers Edge Makes Precision Ag Simple
January 3, 2017
Jon Labine of Argyle, MN, is a regional sales representative for Farmers Edge Inc., one of the latest entries in Read More
DV Wing Drone Volt
DronesDV WING: A Drone Dedicated To Precision Agriculture
January 3, 2017
DRONE VOLT is launching its new fixed-wing unit, a light and compact UAV dedicated to precision agriculture and construction work, Read More