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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, From the Magazine, GNSS, 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 Editor