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Letters to the Editor: Antennas and the Human Body

March 1, 2012 - By

We have been reading with much interest the Innovation column, “GNSS Antennas and Humans” (Innovation, February issue). As the interaction with the human body is something many companies designing GPS into their products do not consider, it is great to see this topic being given some recent attention. We do feel, however, that we should comment on some issues we see in the article, especially as one of our antennas has been used as part of the testing. read more

This article is tagged with , , and posted in Opinions

Unmanned Air Systems: Precision Navigation for Critical Operations

March 1, 2012 - By

An alternative precision GPS architecture, Precision RELNAV, enables an airborne tanker plane and a Navy unmanned combat aircraft to navigate independently to a high degree of precision without requiring carrier-cycle ambiguity resolution using precision GPS ephemeris updates to a tightly coupled GPS/inertial solution onboard each aircraft. The solution rivals that of conventional relative kinematic techniques while providing more robust positioning that reduces message traffic between aircraft and does not require a long filtering time. read more

This article is tagged with and posted in Defense, Navigation, Precision Guidance

Out in Front: The Fire Next Time

March 1, 2012 - By

We have turned back the LightSquared effort to establish a threatening beachhead adjacent to GPS spectrum bands. Having expended many millions, we can now return to our business, secure in having demonstrated both our rights and our rightness. No. We cannot afford to do that. read more

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

On the Edge: Southwest Shakes

March 1, 2012 - By

Using a large network of GPS stations, a team of researchers has found that the Rio Valley Rift in the Southwest United States — previously suspected to be dead — is slowly expanding, at a rate of about 0.1 millimeter per year. The Rio Grande Rift extends from Colorado’s central Rocky Mountains to Mexico. read more

Expert Advice: Thank Your Lucky Stars

March 1, 2012 - By

In my 20-plus years of involvement in the GPS/GNSS industry, nothing has come close to the LightSquared debate for technical and political complexity, nor for potential effects on nearly every high-precision GPS/GNSS user in the United States. The industry’s destiny is somewhat controlled by a federal agency that is not very knowledgeable about how, when, and where GPS is used — although I’m sure they’ve learned a lot in the last 14 months. read more