Archives

Steve Jobs’ Impact on Defense; plus CGSIC, ION

October 11, 2011 - By

Like many who had the pleasure of interacting with the genius that was Steven Paul "Steve" Jobs, I have been reflecting recently concerning his incredible impact on our lives. Indeed his impact on every aspect of our lives including GPS is almost beyond description. For example, our warfighters are increasingly using iPads and iPhones in theater for multiple functions, including some dedicated and warfighter-developed GPS applications that far outshine any GPS application provided by the government. When will we learn that we must provide our warfighters what they need or they will go elsewhere to find it because lives are at stake? Today many of our warriors are developing their own applications on their individual iPads and iPhones, exactly as Steve Jobs intended. read more

This article is tagged with , , , , and posted in Defense, Opinions

Galileo IOV Satellites Fueled for October 20 Launch

October 5, 2011 - By

The first two Galileo navigation satellites are both now fueled and checked for their launch by Soyuz from French Guiana on October 20, reports the European Space Agency. Also, ESA has set up a special website in preparation for the launch. read more

This article is tagged with , , , and posted in GNSS

Car Jammers: Interference Analysis

October 1, 2011 - By

Open-field tests of jamming signals from widely available in-car jammers, measured with an experimental software receiver that records the intermediate frequency (IF) samples, enable a detailed analysis of interference effects from these looming threats. read more

This article is tagged with , , , and posted in Transportation

The System: Compass Signal ICD this Month

October 1, 2011 - By

The long-awaited signal interface control document (ICD) for China’s growing GNSS will appear this month, according to representatives of the system who spoke in a “Compass: Progress, Status, and Future Outlook” workshop as part of ION GNSS and the CGSIC meetings in Portland in September. The ICD has been rumored to be available previously to receiver manufacturers within China, creating... read more

This article is tagged with , and posted in Design & Test, The System

Space-Time Equalization Techniques for New GNSS Signals

October 1, 2011 - By

Spatial and temporal information of signals received from multiple antennas can be applied to mitigate the impact of new GPS and Galileo signals’ binary-offset sub-carrier, reducing multipath and interference effects. read more

This article is tagged with and posted in Design & Test, Receiver Design

Innovation: Filling in the Gaps

October 1, 2011 - By

Improving Navigation Continuity Using Parallel Cascade Identification
To reliably navigate with fewer than four satellites, GPS pseudoranges needs to be augmented with measurements from other sensors, such as a reduced inertial sensor system or RISS. What is the best way to combine the RISS measurements with the GPS measurements? The classic approach is to integrate the measurements in a conventional tightly coupled Kalman filter. But in this month’s column, we look at how a mathematical procedure called parallel case identification can improve the Kalman filter’s job, when navigating with three, two, one, or even no GPS satellites. read more

This article is tagged with and posted in Algorithms & Methods, Design & Test, From the Magazine, Innovation

Out in Front: C’mon, People Now

October 1, 2011 - By

In this hour of crisis, in this hour of need, I would recall for you the immortal words of the Brotherhood of Man, as reprised here by their disciples, Sonny and Cher: For united we stand, Divided we fall, And if our backs should ever be against the wall, We’ll be together, Together, you and I. Or will we? read more

This article is tagged with , , and posted in From the Magazine, Opinions