The System: Michibiki Takes Up Station and Other GNSS Constellation Updates

September 1, 2010 - By

As this issue goes to press in late August, the first Japan Aerospace Exploration Agency Quasi-Zenith Satellite System (QZSS) space vehicle, nicknamed Michibiki, holds steady for a September 11 launch. QZSS will use multiple satellites in inclined orbits, placed so that one satellite always appears near zenith above Japan, well known for its high-rise cities. The design provides high-accuracy satellite... read more

Expert Advice: Location Changes Everything Mobile

September 1, 2010 - By

As today’s handsets and consumer devices become more sophisticated, manufacturers continue to incorporate more and more functionality into a small and sleek form factor. Today’s range of smartphones incorporate voice and data transceivers, GPS, Bluetooth, Wi-Fi, cameras, music, touchscreen interfaces, compasses, motion sensors, cameras, storage cards, and many other technologies. Free turn-by-turn navigation services, such as offered on Google Android phones and iPhones, have created a compelling reason for many of us to own a GPS-equipped smartphone. read more

This article is tagged with , , and posted in Opinions

Spoofing Detection and Mitigation with a Moving Handheld Receiver

September 1, 2010 - By

A single spoofing source has a different spatial signal distribution from the authentic GPS signal. An antenna array can estimate the spatial distribution of the received signal and thus discriminate the spoofing signal from the authentic one. Moving a handheld receiver with a single antenna during signal capture snapshots produces a form of a synthetic array, highly effective in discriminating spoofing signals sourced from a point-source jammer. read more

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

Out in Front: Beyond Cute

September 1, 2010 - By

Michibiki has more Twitter followers than you and me put together. All of you, and all of me with my 17 followers. Michibiki hit 16,284 when I signed on just now, and she (he?) has not yet even emerged upon the global stage. Perhaps by the time you read this, if the September 11 launch date holds true, s/he will be an orbiting, broadcasting entity. read more

This article is tagged with , and posted in Augmentation & Assistance, From the Editor

Innovation: Friendly Reflections

September 1, 2010 - By

Monitoring Water Level with GNSS
A receiver can selectively acquire scattered signals and the resulting measurements can be interpreted to reveal certain characteristics of the source of the scattering. This article discusses the design and application of a GNSS instrument that uses scattered signals for monitoring the level and roughness of inland and coastal water surfaces for the betterment of planet Earth. read more

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

Early Days: The very first GPS brochure ever published, accompanied by a memoir of those times.

September 1, 2010 - By

The first time I ever heard of the Magnavox Research Laboratory in Torrance, California, was in 1966, as a young engineer working at Hughes Aircraft. We were building large (46-foot diameter) ground stations for the Defense Satellite Communications System (DSCS). Magnavox was supplying the secret anti-jam modems used in the terminals. read more

Letters: L5; An Advisor Bids Farewell

September 1, 2010 - By

Letters: The GPS history articles by Brad Parkinson; gifts to L5; Paul Cross, GPS World Advisory Board member, bids Farewell. read more

This article is tagged with , and posted in GNSS

August 31 Webinar Q&A Follow-up

September 1, 2010 - By

Earlier today (August 31), I conducted a webinar titled “Solar Activity, SBAS and 24+3 GPS Constellation Updates.” Considering we only announced the webinar three weeks ago, we had a fantastic registration numbers, with more than 570 registered. I also had a lot of questions before and during the webinar. As customary, I’d like to address some of those as well as present the poll results here. read more

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