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December 16, 2014

Official: Foreign GNSS Signals Need FCC Authorization for Use in United States

A rule largely aimed at opening trade in telecommunication services will require Russia and other international providers of GNSS services to apply for authorization before their navigation signals can be legally used in the United States, a Federal Communications Commission (FCC) official has told GPS experts on the Space-based Positioning, Navigation, and Timing (PNT) Advisory Board.

October 5, 2015 - October 9, 2015
Bordeaux, France
May 10, 2015 - May 12, 2015
Baška, Krk Island, Croatia
December 2, 2014

2nd GLONASS-K1 Finally Reaches Space

Russia launched the second and final GLONASS-K1 flight-test satellite on Sunday (November 30, 2014) from the Plesetsk cosmodrome on board a Soyuz 2-1B rocket.

Built by ISS-Reshetnev, he satellite broadcasts five navigation signals in three frequency bands – L1, L2 and L3. A civil CDMA signal is among those to be transmitted in the L3 band. The spacecraft also carries new equipment to support the international search and rescue system COSPAS-SARSAT: a payload that can relay signals from users in distress.

Inside GNSS • November/December 2014

GNSS Hotspots

1. Tariffs
Beijing, China

Thinking Aloud • November/December 2014

Year 10

Every so often, anthropologists — and maybe a few mathematicians — have a field day puzzling over the origins of our positional base-10 numeral system.

Oh, not the historical origins themselves, the Hindu-Arabic innovations beginning in the 5th and 6th centuries. That’s all pretty much agreed.

No, I’m referring to the possible physiological inspirations, the readily visible digits at the ends of our limbs: 10 fingers, 10 toes.

Coincidence? Does nature have coincidents, or does it abhor them like vacuums — o horror vacui?

December 15, 2014 - December 19, 2014
San Francisco, California, U.S.A.
November 17, 2014

Europe Prepares Its Part of GNSS-Enhanced Search & Rescue Service

The European Space Agency (ESA) has announced completion of tests that indicate the readiness of the European component of a modernized, GNSS satellite–aided search and rescue service known as Cospas-Sarsat.

ESA has completed construction and testing of a trio of located on three islands at the far corners of the continent, ready to pick up distress calls via satellite from across Europe and its surrounding waters.

Inside GNSS • November/December 2014

Evaluating the Performance of Navigation Payloads

As a navigation satellite transmits multiple signals on single frequency (e.g., Open Service and Restricted Service over L5 Band), these are combined on a common carrier to comprise a composite signal. This composite signal passes through navigation payload subsystems such as an up-converter, traveling wave tube amplifier (TWTA), filters, and so on. These subsystems may introduce adverse effects on the signal, such as amplitude and phase distortion, nonlinear effects, gain imbalance, IQ imbalance, and phase noise.

Inside GNSS • November/December 2014

Higher Aspirations for GNSS

New space missions such as the robotic repair and recovery of damaged or errant communication satellites may become possible with the aid of an emerging class of receivers that is able to use GPS signals for navigation in orbits thousands of kilometers above the middle Earth orbit (MEO) GPS constellation itself.

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