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Inside GNSS magazine • Volume 8 Number 4

July/August 2013

Online News, Articles, and Features

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Cover Story
Technical Article

Something Old, Something New

Signal Structures for Satellite-Based Navigation: Past, Present, and Future

Although satellite navigation signals and systems have been designed for more than 40 years, new signals and systems are still being developed. Design concepts continue to be weighed, implemented or rejected, and improved. Some early concepts — postponed because of impracticality at the time — have been revisited and adopted. Here a noted GNSS signal expert introduces a framework that shows past and present signal structures, and offers some conjectures about the future.

Article

Adding Intelligence to Receivers

Autonomous Techniques for Detecting Flawed GNSS Signals

As threats increase from jamming and spoofing, researchers are exploring ways to detect these attempts to alter positioning, navigation and timing information. Authentication of satellite signals is drawing particular attention. This article describes the design and results of an autonomous receiver-based method for detecting efforts to interfere with GNSS signals. First, it characterizes the behavior of affected user equipment and then detects malicious attacks in real time by comparing the observables with normal receiver operation.

Columns & Editorials
Thinking Aloud

Phones, Drones and Privacy

Waiting to Inhale

The conduct of federal officials in the matter of phone and email records inevitably will taint public opinion about civil domestic use of UAS.

Washington View

Location, Location, Location

Everyone and Everything is Somewhere

Increasing awareness of the ways location data is being used, and worries over personal privacy, have led consumers to regularly opt out of sharing location information and triggered protests when tracking is discovered.

Working Papers

Integrity for Aviation

Comparing Future Concepts

Four Galileo satellites are in orbit, EGNOS Safety-of-Life Service is available, and other constellations are being upgraded to dual-frequency capability: now is a good time to investigate the benefits for integrity from the increased number of ranging sources. The authors compare two future integrity concepts that may benefit most: an upgraded dual-frequency satellite-based augmentation system and an advanced receiver autonomous integrity monitoring (RAIM) algorithm with optimized continuity and integrity allocation.

GNSS Solutions

Receiver Architecture

What is a maximum likelihood vector tracking receiver?

What is a maximum likelihood vector tracking receiver?

GNSS Hotspots

GNSS Hotspots

This Time: Popularizing BeiDou, Ashes and Airplanes, Freak floods for Galileo, GLONASS launch failure, Supersized earthquakes and GPS

Thought Leadership Series

Spoofing

Upping the Anti

GNSS receivers can be fooled, but haven’t been much…thus far. Should GNSS stakeholders gamble on the status quo? Will widespread spoofing arrive before antispoofing solutions are in place?

360 Degrees
Industry View
China Satellite Navigation Conference
Signals
Trimble
Trimble
Sensonor
NavtechGPS
Spectracom
Summit
CAST
NovAtel
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