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