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Inside GNSS magazine • Volume 4, Number 4

July/August 2009

Online News, Articles, and Features

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Cover Story
Technical Article

GNSS and Ionospheric Scintillation

How to Survive the Next Solar Maximum

The approaching solar maximum will produce magnetic storms, ionospheric
storms, and disruptions to radio signals that directly affect the
world’s technical infrastructure, including GNSS.  Using a model developed at Cornell University, the authors describe the behavior of the Earth’s atmosphere during solar storms and the resulting phenomenon of ionospheric scintillation. They propose a
method for evaluating the ability of GPS receivers to operate through
scintillation before the next solar maximum arrives in 2013.

Technical Article

SVN49 and Other GPS Anomalies

Elevation-Dependent Pseudorange Errors in Block IIRs and IIR-Ms

This is an updated version of the web article,  Saving SVN49, that
includes discussion of the elevation-dependent pseudoranging anomaly on
the most recently launched GPS satellite and similar anomalies observed
on other GPS satellites.

Technical Article

Making Sense of GPS Inter-Signal Corrections

Satellite Calibration Parameters in Legacy and Modernized Ionosphere Correction Algorithms

With modernized GPS, civilian users will finally have access to full signals on additional frequencies, the L2C and L5 signals, and authorized military users, new M-code signals at L1 and L2. The new signals also come with a new dual-frequency ionosphere correction algorithm. This article, by authors at Charles Stark Draper Laboratory and the MITRE Corporation, describes why a new algorithm is needed, and how the new and old parameters are combined.


GPS EASY Suite II: easy13 - RAIM

In this installment of the series, the author uses Matlab to illustrate key principles in receiver autonomous integrity monitoring.

Columns & Editorials
Thinking Aloud

Satellite Numbers Game

The sky is not falling and neither are satellites from middle earth orbit, but it’s time to re-evaluate the size of the constellation itself.
GNSS Solutions

What is GNSS repeater-based positioning and how is it different from using pseudolites?

Working Papers

Architecture for a Future C-Band/L-band GNSS Mission, Part 2

A Potential Signal Plan and Related User Terminal Aspects

This month’s column continues the discussion of prospective use of C-band frequencies for GNSS systems, addressing optimal design of signals, navigation message structure, and user equipment.

GNSS Hotspots

GNSS Hotspots

GNSS data points and factoids to amuse and inform.

Bombs Away, Boot Sensors, ICD Access, Meet Up in Russia, China Tremblors, and The iPhone Catch in Tokyo…

360 Degrees
Industry View
Jammer Dectector
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