Expert Advice & Leadership Talks

Expert Advice: Loose Coupling — And What’s Wrong With It

January 2, 2015By

Concerns raised about cascaded Kalman filters for loose coupling and/or usage of input data “massaged” in unknown ways are not new, but are routinely excused by requirements to use coordinates from receivers not providing measurement outputs. Often, however, a receiver’s internal 8-state extended Kalman filter (EKF) is not fed with precise carrier phase data — and even when it is, its velocity outputs (being both filtered and unaided) have limited ability to follow high dynamics. Velocity pseudomeasurements under those conditions interfere with IMU aiding. read more

Directions 2015: BeiDou Belongs to China, and to the World

December 1, 2014By

By adhering to the principles of independence, openness, compatibility, and gradualness, China is steadily accelerating the construction and development of the BeiDou Navigation Satellite System. The BeiDou System already provides continuous and reliable Full Operational Services to most parts of the Asia-Pacific region. Its positioning, navigation, and timing performance keeps improving, while the deployment for a global constellation is also making progress. The BeiDou System and its products, which are compatible with other navigation satellite systems, have been gradually applied in many sectors and industries related to the national economy and to entering the mass market. read more

This article is tagged with , , and posted in BeiDou/Compass, Expert Advice & Leadership Talks, GNSS, Opinions

Directions 2015: What It Takes to Make a Gold Standard

December 1, 2014By
GPS-directions-Cooley

Last year in my “Directions” article, I emphasized the commitment made by the U.S. government to ensure GPS signals are available to all users, and I shared some of our excitement in the GPS Directorate regarding the modernized capabilities we are developing and fielding. This year I’d like to share with you progress we’ve made in the past 12 months, provide an update on the modernization initiatives, and challenge civil users and receiver companies to innovate and accelerate these modernized capabilities for users worldwide. read more

Expert Advice: Managing GPS, Take Two

December 1, 2014By

By John Lavrakas, Advanced Research Corporation What a difference eight years can make! My September 2006 GPS World article “Managing the GPS Constellation for Today’s Needs” dealt with GPS performance issues many high-precision users then faced. Demanding applications of real-time precision positioning, such as precision agriculture and machine control, did not find enough satellites in view to support their needs. I... read more

This article is tagged with , and posted in Expert Advice & Leadership Talks, Opinions

Latest Words from the Acquisition Guru of the World’s Gold Standard for PNT

September 1, 2014By
Col. William Cooley, Director, U.S.A.F. Global Positioning Systems Directorate.

Colonel William “Wild Bill” Cooley, director of the GPS Directorate at Space and Missile Systems Center, discusses CNAV signals, GPS IIF launches, and the OCX with Defense Editor Don Jewell. There is probably no busier United States Air Force officer than Colonel William “Wild Bill” Cooley, Ph.D., the director of the GPS Directorate at Space and Missile Systems Center (SMC),... read more

‘Flying for GPS': Memoir of a Pioneer Era — Excerpt

July 1, 2014By

Flying for GPS, a chronicle of Len Jacobson’s role in the development and promotion of the Global Positioning System, has just been published. The book spans a 50-year career, during which Jacobson flew 2.5 million miles as a missionary for GPS and as a developer of user equipment. He kept an extensive log of all of his flights, and it... read more

Expert Advice: The Range of UAVs Across Civil Applications

May 1, 2014By
Peter Cosyn, Trimble

Unmanned aerial vehicles (UAVs), or as most civil aviation authorities now call them, unmanned aircraft systems (UASs), are attracting a lot of attention lately from geospatial professionals. Common questions in their minds are: What applications can I use it in? What benefits can it provide to my organization or my clients (or data users)? How do I implement such a system in my organization? This article will cover the first two questions, while addressing some of the third as well. read more

This article is tagged with and posted in Autonomous Vehicles/UAVs, Expert Advice & Leadership Talks

Expert Advice: The Low Cost of Protecting America

January 1, 2014By

By Dana A. Goward Highly precise and free for use by anyone with an inexpensive receiver, GPS and other GNSS are great. Their navigation and timing signals have been incorporated into nearly every aspect of modern life, from synchronizing power grids to financial systems, the Internet, telecommunications, and transportation. The U.S. Department of Homeland Security estimates that these signals are... read more