Spirent
Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
GPS Galileo Glonass BeiDou Regional/Augmentation
IFEN
NovAtel
Egnos
Trimble
L3
Thought Leadership Series
E-Library
Inside GNSS
September/October 2014 • Volume 9 Number 5

A Learning Experience
Silver Linings for GNSS?

Alison Brown: Tally Ho! The Hunt for GNSS Innovations

Developing an Ionospheric Scintillation Monitoring Receiver

GNSS & Geodesy
Sizing Up the Earth

GNSS Hotspots
Hotspots in Las Vegas, Nevada; Eastern Queen Maud Gulf, Canada; Guinea, Liberia, Sierra Leone; Moscow; Harbin, China

How do you trust centimeter level accuracy positioning?

Kingfisher
Setting Sail with GNSS-Guided Robotics

OCX Program Restructured, Delayed Again

SAGAIE
A GNSS Network for Investigating Ionospheric Behavior in Sub-Saharan Regions

July/August 2014 • Volume 9 Number 4

A Universal GNSS Software Receiver Toolbox
For Education and Research

Assessing the Performance of GNSS Signal Acquisition
New Signals and GPS L1 C/A Code

Environmental Sensing
A Revolution in GNSS Applications

GNSS & Geohazards
Early Warning for Life on the Faultline

GNSS Hotspots
Hotspots in Portland, Oregon; Cape Canaveral and Kourou; Greenwich, UK; Barcelona and London; Beijing and Cupertino, California

GNSS Position Estimates

GPS Receiver Performance On Board a LEO Satellite
The Navigation and Occultation eXperiment

New Leaders at the GPS Helm
Changes across the board as a new threat to spectrum emerges

The Next Big Mac
The ISEE-3 Reboot Project

May/June 2014 • Volume 9 Number 3

An Airborne Experimental Test Platform
From Theory to Flight: Part 2

Collective Detection of Multi-GNSS Signals
Vector-Acquisition Promises Sensitivity and Reliability Improvement

DoD Condenses Acquisition Strategy to Speed M-Code Units

GNSS Hotspots
Hot spots in California, Florida, Tianjin, Kourou and the Antarctic

GNSS in Military Affairs
(And Vice Versa)

How do you compute a relative position using GNSS?

It’s Spring, and EGNOS Is in the Air

Location Authentication
Enabling New Smartphone Apps

Michel Monnerat: Out of Africa — GNSS

Papering Over Safety Gaps
Implementing Real Safety-of-Life Mandates

Satellite Outages Afflict GLONASS
The Russian system suffers two major disruptions in April

March/April 2014 • Volume 9 Number 2

An Airborne Experimental Test Platform
From Theory to Flight: Part 1

Fast and Flexible
Tracking and Mitigating a Jamming Signal with an Adaptive Notch Filter

Galileo Works!
Results of the Galileo In-Orbit Validation Test Campaign

GNSS Hotspots

GPS Modernization Stalls

New GNSS Signals
Will Modern Also Be Better?

Paternity Suit
Recognizing the Assets and Values That We've Inherited

Who’s Your Daddy?
Why GPS Will Continue to Dominate Consumer GNSS

January/February 2014 • Volume 9 Number 1

Design of a GNSS Acquisition-Aiding Signal
Improving Sensitivity and TTFF

GNSS Hotspots

IGS-MGEX
Preparing the Ground for Multi-Constellation GNSS Science

Ionospheric Scintillation
How Do Modern GNSS Signal Processing Techniques Deal with Equatorial Ionospheric Scintillation?

Marc Weiss
The Art of Time

Multi-GNSS Monitoring
Practice Versus Theory

Proposal for U.S. eLoran Service Gains Ground

Reaching for the STARx
A Software-Defined All-GNSS Solution

Won’t Get Fooled Again
How’s That Hopey-Changey Stuff Working Out For Ya?

November/December 2013 • Volume 8 Number 6

Elizabeth Rooney: ‘Not a typical job for most working mums.’

Finding the Right Algorithm
Low-Cost, Single-Frequency GPS/GLONASS RTK for Road Users

GLONASS: Not a Red Menace
Déjà Vu All Over Again

GNSS Hotspots

GNSS Spectrum: Sharing or Protection?

Integrated Navigation
GPS/BeiDou/INS Performance in Two Hemispheres

Multipath vs. NLOS signals
How Does Non-Line-of-Sight Reception Differ From Multipath Interference?

OCX and GPS Cybersecurity

Questions in Wake of New Galileo Delay
A Tale of Two Cities

RF Spectrum Protection
What does it mean for GNSS?

Urban Positioning on a Smartphone
Real-time Shadow Matching Using GNSS and 3D City Models

September/October 2013 • Volume 8 Number 5

Cooperative GNSS Authentication
Reliability from Unreliable Peers

From Lab to Road Test
Using a Reference Vehicle for Solving GNSS Localization Challenges

Galileo Launch Delayed; EU States Begin PRS Tests

GNSS Antennas
A Crucial Element

GNSS Hotspots

Ismael Colomina: GNSS, Of Course!

Measuring High Bandwidth GNSS Signals for Indoor Positioning

Network Real Time Kinematic GPS
Network RTK

Peer-to-Peer Counseling
Learn from the People

UAV Operations in National Air Space Advance as Privacy Fight Heats Up

What’s Next for Practical Ubiquitous Navigation?
World Models and Magnetic Field Maps

July/August 2013 • Volume 8 Number 4

Adding Intelligence to Receivers
Autonomous Techniques for Detecting Flawed GNSS Signals

GNSS Hotspots

Integrity for Aviation
Comparing Future Concepts

Location, Location, Location
Everyone and Everything is Somewhere

Phones, Drones and Privacy
Waiting to Inhale

Receiver Architecture
What is a maximum likelihood vector tracking receiver?

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

Spoofing
Upping the Anti

May/June 2013 • Volume 8 Number 3

Air Force Proposes Dramatic Redesign for GPS Constellation

BeiDou
China’s Rapidly Emerging GNSS

BeiDou Gets Ready for the Global Marketplace
Focus on IP, Patents, and Standards  

Calculating Time Offsets
How do you deal with timing differences between GNSSes?

Di Qiu: Opportunities of Signals

Europe Needs Entrepreneurs
Is the Galileo Community Finally Getting Down to Business?

From Fledgling to Flight
Boeing's Little Bird UAV

GNSS Hotspots

In-Car GNSS Jammer Localization Using Vehicular Ad-Hoc Networks

Living in an APNT World
Plugging Gaps and Ensuring Coverage

MUSTER
A Collaborative GNSS Receiver Architecture for Weak Signal Processing

March/April 2013 • Volume 8 Number 2

Assessing GNSS Data Message Performance
A New Approach

Civil Use of UAS
A Little More Light, Please

Droning On about UAVs
Focusing on Public Fears

eCall Rising
Europe's Automated Emergency Response

Galileo on Its Own
First Position Fix

GNSS Filtering Options
What are the differences between least-squares and Kalman filtering — the cornerstones of any GNSS or integrated system?

GNSS Hotspots

It's Complicated
Lawmakers Propose Dozens of UAS, Location Privacy Bills

Letters: Get a Start on GNSS Interoperability Now

Mike Veth: Engineering Meets the Wild Blue Yonder

RedBlade
Building a Better Robot

The PNT Boom
Future Trends in Integrated Navigation

January/February 2013 • Volume 8 Number 1

Developing a GNSS Position and Timing Authentication Testbed
GNSS Vulnerability and Mitigation Techniques

Galileo Altimetry Using AltBOC and RTK Techniques

GNSS and Ubiquity
Can we get a little help here?

GNSS Hotspots
Timing, Tracking Headaches, Insuring Vulnerability, Backup Plans and GPS to the Rescue plus Robot Turtle

Markets and Multi-Frequency GNSS
What will limit the spread of multi-frequency GNSS receivers into the mass market?

More Than Money Worries
OCX and the New Civil Signals

No Time Like the Present for Europe in Asia
Not Just Galileo, but GNSS

The GNSS Merry Go Round
Centrifugal vs. Centripetal Forces

The GNSS Quartet
Harmonizing GPS, GLONASS, BeiDou and Galileo

November/December 2012 • Volume 7 Number 6

2012 European Satellite Navigation Competition Results
GNSS Contest Winners Take Us Indoors, Outdoors, All Around the Town

Digital Satellite Navigation and Geophysics: A Practical Guide with GNSS Signal Simulator and Receiver Laboratory
A review of Ivan G. Petrovski and Toshiaki Tsujii's new textbook

Galileo Round Up
Satellite Problems, New Regulation, Budget Top Europe’s GNSS Agenda

GNSS Hotspots
Tracking Trafficking, Bringing in the Little Guy, Problematic Posts, Lightning and Affordable Air Strike

GNSS Positioning and Precise Timing
It's All About Precise Time

LTE, Positioning, and the Implications for GNSS Over-the-Air Testing

Navipedia — The GNSS Wiki
A Reference for Global Navigation Satellite Systems

Non-Gaussian Noises
What about Gaussian vs. non-Gaussian noise in inertial/GNSS integration?

Our Harvest Being Gotten In
May the Future of GNSS Be Ever More Bountiful

Taking Turns at the Fiscal Cliff
GPS Funding Problems Cloud the Future

September/October 2012 • Volume 7 Number 5

Exploiting the Galileo E5 Wideband Signal
for Improved Single-Frequency Precise Positioning

Fractured GNSS Fairy Tales
What’s not to like about GPS?

Genene Fisher: Bringing Space Science Down to Earth

GNSS Augmentations
When a Signal in Space Isn’t Enough

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

GPS Civil Funding
The Check is in the Mail

Improving GNSS Attitude Determination
Using Inertial and Magnetic Field Sensors

Spoofs, Proofs & Jamming
Towards a Sound National Policy for Civil Location and Time Assurance

Vector Delay Lock Loops
How do vector delay lock loops predict the satellite signals?

July/August 2012 • Volume 7 Number 4

Brussels View: Remembrance of Things Past
Can China and Europe Get Over a Failed GNSS Partnership?

Can Congress Rescue Itself?
Sequestration Consequences for GPS

Congressional ‘Sequestration’ Gambit Looms Over GPS Budget

Drones to the Rescue!
Unmanned Aerial Search Missions Based on Thermal Imaging and Reliable Navigation

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

INS Face Off
MEMS vs. FOGs

Interference & Jamming
(Un)intended Consequences

Peer-to-Peer Cooperative Positioning
Part II: Hybrid Devices with GNSS & Terrestrial Ranging Capability

Single- versus Dual-Frequency Precise Point Positioning

May/June 2012 • Volume 7 Number 3

A European Perspective on Patent Dispute over GPS-Galileo Civil Signal
Sidebar to Washington View: USPTO Nears Approval of Troubling British Patent on New GPS Civil Signal

Demystifying GLONASS Inter-Frequency Carrier Phase Biases
Digital versus Analog

Difference Correlators
Does Indoor Carrier Phase Tracking Allow Indoor RTK?

GNSS Hotspots
Sierra Nevadas grow and Venice sinks, GLONASS-K testing, traffic updates, jamming, ships at sea and more

GPS Receiver Specifications
Compliance and Certification

How do GNSS-derived heights differ from other height systems?

IP Rights and Wrongs
Encroaching upon the commonwealth of GNSS

Multi-GNSS Integration
The Challenges of Diversity

Truth on the Range
USAF's New Reference System

USPTO Nears Approval of Troubling British Patent on New GPS Civil Signal

March/April 2012 • Volume 7 Number 2

China Will Launch Five Compass /BeiDou Satellites in 2012
Chinese manufacturers have ICD details - but the rest of the world will have to wait

Coarse Time Positioning

EU's Galileo and EGNOS Expect 2014-2020 Budget Boost of $9.1 billion
ESA plans aggressive Galileo launch schedule towards initial operational capability in 2014

GLONASS Plans 30 Satellites, Complete Augmentation System and Improved OCX by 2020
With a fully operational constellation and a big budget for GNSS, The Russian Space Agency pushes ahead

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

GNSS Jamming in the Name of Privacy
Potential Threat to GPS Aviation

GNSS Modernization
Challenges & Opportunities

Japan Aims at 4-Satellite QZSS by Decade's End
India plans a GAGAN launch later this year

LightSquared Fallout May Prompt Push for GPS Receiver Standards

LightSquared Lessons Learned

One-Centimeter Accuracy with PPP
The Future of Satellite Navigation

Peer-to-Peer Cooperative Positioning
Part I: GNSS-Aided Acquisition

Satellite Development Advances as GPS Survives Budget Cuts, LightSquared
But jamming devices could affect the FAA's GPS-dependent NextGen program

The GPS Dot and its Discontents
Privacy vs. GNSS Integrity

January/February 2012 • Volume 7 Number 1

$655 Million for GLONASS in 2012

Challenges in GNSS /INS Integration
Learning inertial navigation and error propagation equations can be daunting for those with a GNSS background

Code Tracking and Pseudoranges

Contact!
First Acquisition and Tracking of IOV Galileo Signals

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

GPS - The DoD's Profit Center

New Austerity Squeezes GPS as DoD Tightens Its Belt

Optimal Aligning of the Sums of GNSS Navigation Signals

Winging It
GNSS and Human Flight

November/December 2011 • Volume 6 Number 6

EU Launches Two Navigation Satellites; Galileo is On Its Way
First two IOV satellites are in their final orbit and undergoing testing and activation of their navigation payloads

From Family Friendly to Seriously Scientific, GNSS Ideas Contest Rewards New Commercial Applications
2011 European Satellite Navigation Competition - The Galileo Master Awards

GLONASS Trio in Orbit, Another K-Class to Follow
Russian GNSS constellation has 23 operational satellites

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

LightSquared: Who Pays for GPS Receiver Fixes Yet to be Devised?

Making Virtual Solid
A Technology Whose Time Had Already Come

Network RTK and Reference Station Configuration

Oh No! Not LightSquared Again!
Still posing risks for critical U.S. infrastructure and national defense

Solar Max and Space Weather Prediction
This cycle is a first-time test for GPS-based technology installed since the last solar maximum.

Staying In Lane
Real-Time Single-Frequency PPP on the Road

The Digital TV Case
Positioning Using Signals-of-Opportunity Based on OFDM Modulation

The Year's Top Stories from Inside GNSS
The Saga of LightSquared vs. GPS Dominated the News in 2011

True3D HUD Wins Global SatNav Competition
Meeting the USA Challenge and More

September/October 2011 • Volume 6 Number 5

A Comprehensive Reference for OPUS

Breaking the Ice
Navigation in the Arctic

Cars on the Road!
Cooperative Vehicle Safety Applications Using an Integrated Positioning Solution

Codes: The PRN Family Grows Again
Aviation Applications: Hybrid Navigation Techniques and Safety-of-Life Requirements, Part 2

Everywhere Navigation
Integrated Solutions on Consumer Mobile Devices

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

GPS III
Bringing New Capabilities to the Global Community

Looming Budget Hurricane Could Swamp the GPS Landscape
The Washington View

Multiple GNSS: Compatibility & Interoperability
More GNSS systems — success or excess?

Protecting the UK Infrastructure
A System to Detect GNSS Jamming and Interference

The Differences in Differencing

Worst GPS President Ever?

July/August 2011 • Volume 6 Number 4

GLONASS-K for Airborne Applications
Issues and Perspective

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

GNSS-Based Attitude Determination
Aerospace and Formation Flying

GPS Interference Testing
Lab, Live, and LightSquared

Inertial technology, MEMS, and GNSS

LightSquared Flunks GPS Interference Tests: What Now?
The Washington View

The Fire Next Time
Preparedness for the next attack

Verification Testing
of a Multi-GNSS RF Signal Simulator

What is a virtual reference station and how does it work?

May/June 2011 • Volume 6 Number 3

A Target — Possibly Moving
Who is responsible for protecting mobile satellite services?

Finding the Interference
Karunhen-Loeve Transform as an Instrument to Detect Weak RF Signals

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

Homeland Security Steps Up to Protect GPS (But Not from LightSquared)
The Washington View

How do you compute relative position using GNSS?

Keeping the Spoofs Out
Signal Authentication Services for Future GNSS

Modernization Times
Col. Bernard Gruber and the GPS Enterprise

RF Spectrum Allocations, Interference, and GNSS Receiver Design

March/April 2011 • Volume 6 Number 2

Can You Hear Us Now?
How well is the process of GPS technology policy and management being handled by the FCC?

Coherent Integration Time Limits
for Mobile GNSS Receivers in Multipath Fading Environments

GNSS Hotspots
GNSS Data Points and Factoids to Amuse and Inform

GNSS Inside Mobile Phones
GPS, GLONASS, QZSS and SBAS in a Single Chip

GNSS Receiver Clocks

GPS Community Confronts LightSquared Move into L1 Spectrum
The Washington View

Integer Aperture Estimation
A Framework for GNSS Ambiguity Acceptance Testing

Meet GINA
Road User Pricing with GNSS and EGNOS

The Civilian Battlefield
Protecting GNSS Receivers from Interference and Jamming

January/February 2011 • Volume 6 Number 1

A Model-Based Approach
To Signal-in-Space Specifications for Designing GNSS Receivers

Differences between Signal Acquisition and Tracking

GNSS Hotspots
GNSS Data Points to Amuse and Inform

GNSS Interoperability
Not So Easy, After All

Indian Regional Navigation Satellite System
Correction Parameters for Timing Group Delays

Spectrum-Compact Signals
A Suitable Option for Future GNSS

Wavelets and Notch Filtering
Innovative Digital Processing Techniques for Mitigating RF Interference

Your Signal Is My Noise
Raising questions of GNSS compatibility and interoperability

November/December 2010 • Volume 5 Number 8

eVOTZ: Mobilizing Voters
Winner of the First USA Challenge

Frank Czopek
The Go-To Guy on GPS Block II

Galileo GNSS Pushes Through European Budget Shortfalls, EGNOS Back on Track
European Space Agency Awards Space and Ground Services Contract to SpaceOpal

Galileo Master, Winner of the 2010 European Satellite Navigation Competition
Mobilizy-Virtual Reality on the Road

GNSS Hotspots
GNSS data points and factoids to amuse and inform

GPS Programs Push Ahead

Local Oscillator Phase Noise
Effects on GNSS Code Tracking

Measuring GNSS Signal Strength
What is the difference between SNR and C/N0?

Military PNT — The Way Ahead
Changing the Game Changer

World Wide GNSS
How do we determine the starting line for innovation?

October 2010 • Volume 5 Number 7

A Search for Spectrum: GNSS Signals in S-Band, Part II

GNSS Hotspots
GNSS data points and factoids to amuse and inform

GNSS Simulation: A User's Guide to the Galaxy

Launch Fever
Keeping track of GNSS progress

NaviForum Shanghai 2010
China’s Industry Gets with Compass Program

When GNSS Goes Blind
Integrating Vision Measurements for Navigation in Signal-Challenged Environments

September 2010 • Volume 5 Number 6

A Fully Digital Model for Kalman Filters

A Search for Spectrum
GNSS Signals in S-Band, Part 1

GNSS Hotspots
GNSS data points and factoids to amuse and inform

GNSS Simulators
Part 2: Everything you wanted to know...but were afraid to ask

GPS IIF-1 Satellite
Antenna Phase Center and Attitude Modeling

Help from Above
Flight Testing Two Alternatives to Ground-Based DGPS

Level Crossing Rate Estimation (LCRE)
A New Technique for Finding GNSS Carrier-to-Noise Ratios

The Missing ICD
Awaiting the publication of the Compass/Beidou ICD

July/August 2010 • Volume 5 Number 5

Aviation Applications: Hybrid Navigation Techniques and Safety-of-Life Requirements
Second of Two Parts

Aviation Grade
New GPS Signals — Chips Off the Block IIF

Generating Carrier Phase Measurements

GLONASS CDMA
Some Proposals on Signal Formats for Future GNSS Air Interface

GNSS Hotspots
GNSS data points and factoids to amuse and inform

Interesting. Too Interesting?
Receivers are going to get complicated. Very complicated.

On the Air
New Signals from the First GPS IIF Satellite

Testing Multi-GNSS Equipment
Systems, Simulators and the Production Pyramid

June 2010 • Volume 5 Number 4

Aviation Applications
Part I: Hybrid Navigation Techniques and Safety-of-Life Requirements

CAPS — China’s Regional Navigation Satellite System

Deselecting Unavailability
The ten year anniversary of the death of Selective Availability

Easy Suite II
easy17—Visualizing Satellite Orbits, easy18—Computing Range and Range Rate Corrections

GNSS Hotspots
GNSS data points and factoids to amuse and inform

Going Deep
Blending GNSS with 3-D Sonar Imaging for Underwater Applications

The GPS Assimilator
Upgrading Receivers via Benign Spoofing

The Math of Ambiguity

May 2010 • Volume 5 Number 3

Easy Suite II: easy16
Comparing GPS Precise and Broadcast Ephemerides

Enter Your GNSS App in the USA Challenge by July 31!
A brand-new regional contest in the 2010 European Satellite Navigation Competition

GNSS Hotspots
GNSS data points and factoids to amuse and inform

GNSS Solutions
is on holiday and will return in the June 2010 issue.

GPS: The Present Imperfect
Why we should stop taking GNSS for granted, start worrying about signal failure and malicious jamming, and do something about it!

ICDs — Another Good Example
A crucial milestone for the Galileo program and the GNSS community

Letters: TIMATION Developer's Honor Draws Fire
Brad Parkinson and Richard Easton respond to the Inside GNSS news article on the first satellites to fly atomic clocks, Roger Easton and the origins of GPS

One Fine Day at the DLR
Exploring the German Aerospace Center

SLAM Dance
GNSS/Intertial-Aided Location and Mapping Indoors

Taking Positioning Indoors
Wi-Fi Localization and GNSS

Working Papers
is on holiday and will return in the June 2010 issue.

March/April 2010 • Volume 5 Number 2

1 Antenna, 3 Dimensions
GPS Flight Control in UAV Operations

A Closer Look at the GPS OCX Contract
Coordination with GPS III An Issue

Bernard Gruber to Assume USAF GPS Wing Command: New Direction in Store?

GNSS Hotspots
GNSS data points and factoids to amuse and inform

How Is Solar Activity Predicted and How Can Predictions Be Used With GNSS?

José-Ángel Ávila-Rodríguez: Dreaming of Satellites

Ready to Navigate!
A Methodology for the Estimation of the Time-to-First-Fix

Service and Security
The vulnerability of our timing and transportation infrastructure

Wide-Area RTK
High Precision Positioning on a Continental Scale

January/February 2010 • Volume 5, Number 1

Acoustics & GPS
Real-Time Scoring and Classification of Munitions

Are Carrier-to-Noise Algorithms Equivalent in All Situations?

Combined Integrity of GPS and Galileo

European Commission Okays Key Galileo Contract After Years-Long Political Morass

GNSS Forum: How Galileo Can Help Europe Recover from the Economic Crisis

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GPS EASY Suite II: easy15
Positioning Accuracy with Pseudorange & Carrier Phase

Modernization Milestone
The GPS Civil Monitoring Performance Specification

More of the Same
Loran-C’s demise follows the probable abandonment of enhanced Loran (eLoran) as a backup to GNSS systems subject to jamming and interference

Three GLONASS-M Satellites Launched in December, All Operational as of February 1

November/December 2009 • Volume 4, Number 6

Coherent Integration Time
The Longer, the Better

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GNSS Milestones
GNSS Leaders Review 2009 and Predict 2010

The Golden Age of GNSS

The Top Ten in PNT
National Space Competitiveness

Timing on the Fly
Synchronization for Direct Georeferencing on Small UAVs

Why is it so difficult to launch a spaceborne GNSS receiver?

September/October 2009 • Volume 4, Number 5

A-GNSS: A Different Approach

Book Reviews

Easy Access
Introduction to GPS: The Global Positioning System, Second Edition, by Ahmed El-Rabbany

Fireside GPS
Global Positioning System: Signals, Measurements, and Performance, Second Edition, by Pratap Misra and Per Enge

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

Good, But Not Great
Global Navigation Satellite Systems: GPS, GLONASS, Galileo and More, by Bernard Hofmann-Wellenhof, Herbert Lichtenegger and Elmar Wasle

GPS EASY Suite II: easy14 - EGNOS-Aided Aviation

Growing Up with GNSS
Enlarging the GNSS pie is better than fighting over the size of the pieces.

Remote Sensing with Reflected Signals
GNSS-R Data Processing Software and Test Analysis

Signal Authentication
A Secure Civil GNSS for Today

The Soft Approach
A Recipe for a Multi-System, Multi-Frequency GNSS Receiver

What about Carrier-to-Noise Density and AI for INS/GPS Integration?

July/August 2009 • Volume 4, Number 4

Architecture for a Future C-Band/L-band GNSS Mission, Part 2
A Potential Signal Plan and Related User Terminal Aspects

GNSS and Ionospheric Scintillation
How to Survive the Next Solar Maximum

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GPS EASY Suite II: easy13 - RAIM

Making Sense of GPS Inter-Signal Corrections
Satellite Calibration Parameters in Legacy and Modernized Ionosphere Correction Algorithms

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.

SVN49 and Other GPS Anomalies
Elevation-Dependent Pseudorange Errors in Block IIRs and IIR-Ms

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

May/June 2009 • Volume 4, Number 3

Architecture for a Future C-Band/L-Band GNSS
Part I: C-Band Services, Space and Ground Segments, Overall Performance

First Look
Observing the GPS L5 Test Transmission from SVN49 Using Software Radio Processing

Galileo and the European Commission: Buying and Building a GNSS

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

Inflection Points
GNSS providers continue to exhibit nationalist tendencies

Modernization Milestone
Observing the First GPS Satellite with an L5 Payload

Synthetic Aperture GPS Signal Processing
Concept and Feasibility Demonstration

What About Vector Tracking Loops?

March/April 2009 • Volume 4, Number 2

A Multi-Antenna Defense: Receiver-Autonomous GPS Spoofing Detection

GLONASS Ambiguity Resolution

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

Grace Xingxin Gao: Amazing Grace
A Hot Start for a Young Engineer from China’s Ice City

On the Trails of the Inuit: GPS Tracking for Snow Machines and Dogsleds
Adapting GPS for Nunavut Hunters and Environmental Research

The GPS EASY Suite II: A Matlab Companion

What Race? What Competition? The Four GNSS Systems

Whither Galileo, and Why?

January/February 2009 • Volume 4, Number 1

Autonomous Integrity
An Error Isotropy–Based Approach for Multiple Fault Conditions

Critical Infrastructure: The United States and GPS

GNSS Hotspots
GNSS data points and factoids to amuse and inform

GNSS in Space, Part 2: Formation Flying Radio Frequency Techniques and Technology

GPS & Regime Change, Part 2
What Lies Ahead

ICG-3: Friendly Persuasion

QZSS's Indoor Messaging System
GNSS Friend or Foe?

What about GPS jamming and maritime safety, and linear carrier phase combinations?

November/December 2008 • Volume 3, Number 8

GNSS Hotspots
GNSS data points and factoids to amuse and inform

GNSS in Space: Part 1
Formation Flying Radio Frequency Missions, Techniques, and Technology

GPS and Regime Change, Part 1
The Bush Legacy

GPS Modernization Snapshot: WAAS, L2C, Launch Delays

Probabilities and Multipath
Mitigation Techniques Using Maximum-Likelihood Principles

Satellite Almanac Life Expectancy

Waiting to Exhale: End of the Bush Administration

Weather Report
Meteorological Applications of GNSS from Space and on the Ground

Fall 2008 • Volume 3, Number 7

A Soft Touch: Sogei’s GPS/Galileo Software Receiver and Institutional GNSS Applications in Italy

Columns

Don't Dump That Data!: Thorough Use of GNSS Measurements

Femtocells: Bringing Reliable Location and Timing Indoors

Galileo’s New Era
Step by Step, the Program Advances

GNSS Hotspots
GNSS data points and factoids to amuse and inform

GNSS Watch Dog: A GPS Anomalous Event Monitor

The Six Percent Solution: More Science and Engineering Students Needed
We are floating in a sea of technology and forgetting how to swim

September/October 2008 • Volume 3, Number 6

China Adds Details to Compass (Beidou II) Signal Plans

Follow the Sun: GNSS and Solar Car Racing

Future Time
Opportunities for Using Optical Clocks in GNSS Systems

Galileo Down to a Millimeter: Analyzing the GIOVE-A/B Double Difference
Third of three stories about Galileo's new signals in space

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

Interoperable World: the ICG Should Avoid a Cold War mentality

MBOC vs. BOC(1,1): Multipath Comparison Based on GIOVE-B Data
Second of three stories about Galileo's new signals in space

Penny Axelrad: A Love for Hard Work . . . and Hard Science

Principles of GNSS, Inertial, and Multisensor Integrated Navigation Systems
A review of Dr. Paul Groves' new book.

Quantifying the performance of navigation systems and standards for assisted-GNSS

Spread Spectrum Systems for GNSS and Wireless Communications
A review of Jack K. Holmes' new book

The View from Chilbolton: In-Orbit Test Results from the Second Galileo Satellite
First of three stories about Galileo's new signals in space

Wireless Positioning: Technologies and Applications
A review of Alan Bensky's new book

July/August 2008 • Volume 3, Number 5

AGNSS Standardization
The Path to Success in Location-Based Services

Europe Launches Full Galileo Procurement

Faulty Booster Component Delays IIR-M Launches

GNSS Indoors: Fighting the Fading, Part 3

JAMFEST
Testing Your Way Out of a GPS Jam

Lost in the Noise: The Need for Longterm Infrastructure Development

Real-time Kinematic with Multiple Reference Stations

Ron Beard: The Measure of Time

Seamless Navigation
Through GPS Outages - A Low-Cost Solution

May/June 2008 • Volume 3, Number 4

From RAIM to NIORAIM
A New Integrity Approach to Integrated Multi-GNSS Systems

GIOVE-B on the Air
Understanding Galileo's New Signals

GLONASS–A New Look for the 21st Century

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GNSS Indoors — Fighting The Fading, Part 2

Integrating Inertial Sensors with GNSS Receivers
A review of James L. Farrell's new book

Limits of Imagination

Preserving A Legacy
Integration of SAASM and Commercial GPS Receivers with Existing Shipboard Systems

What about WAAS Functions and Differential Biases?

Spring 2008 • Volume 3, Number 3

Double Estimator–A New Receiver Principle for Tracking BOC signals

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GNSS on the Go–Sensitivity and Performance in Receiver Design

Less Is More–The Potential of Partial IMUs for Land Vehicle Navigation

Persuasive Arts

The Art of ARTUS–A Second-Generation Galileo/GPS Receiver

U.S. PNT Initiative: E Pluribus Unum?

March/April 2008 • Volume 3, Number 2

Europe Readies Galileo Procurement
Getting Ready for an Operating Galileo System? 

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GNSS Indoors — Fighting The Fading, Part 1

GPS-IMU
Development of a High Accuracy Pointing System for Maneuvering Platforms

Luiz Paulo Fortes — Putting Brazil on the Map

Mathematical Models and GNSS Interference

Russia Dwells on Glonass Future

SAASM On Trial
A Test Regime for Integrated GPS Military Systems

The Easy Part

January/February 2008 • Volume 3, Number 1

China GNSS 101
Compass in the Rearview Mirror

China Travel Journal
Getting Around China with a GPS Receiver and No Street-Level Maps

Geospatial Fusion on the Fly
Airborne Mapping in the Alaska Bush

GIOVE on the Line
Latest Results and A-2 Design

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GPS Turns 30
Number 1: GPS SVN01

MEMS and Platform Orientation & Deep Integration of GNSS/Inertial Systems

Ron Hatch: Searching for a Better Way

Seems Like Only Yesterday

Unmanned Air Vehicles
An Overview

November/December 2007 • Volume 2, Number 8

Active GNSS Networks and the Benefits of Combined GPS + Galileo Positioning

Elizabeth Cannon: Geomatics Innovator

Galileo Open Service and Weak Signal Acquisition

GNSS & Space Weather
Making the Least Out of Solar Max

GNSS Believer

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

Measuring Up: Certification Processes and Testing of A-GPS Equipped Cellular Phones

Fall 2007 • Volume 2, Number 7

Fuzzy Time
GPS-Based Synchronizers in the Presence of Interference

Galileo: Redirecting a Stuttering Program
News Analysis and Commentary

GNSS Hotspots
GNSS data points and factoids to amuse and inform.

GPS/GPRS on the Road
Virtual Radar for a Swiss Bus Fleet

Lightening the Data Processing Load
Signal Compression in GNSS Receivers

Reign of Point Clouds
A Kinematic Terrestrial LIDAR Scanning System

Say "Hello" to Galileo's PRS
Making the Case to Security-Minded Communities

Time Against Time

September/October 2007 • Volume 2, Number 6

Authenticating GNSS: Proofs against Spoofs, Part 2

eLoran and Signal Reception Under Snow

GNSS Time Offset
Effects on GPS – Galileo Interoperability Performance

GNSS: A System of Systems

Karl Kovach: Keeper of the Code

The MBOC Modulation
A Final Touch for the Galileo Frequency and Signal Plan

What’s Going On? RFI Situational Awareness in GNSS Receivers

July/August 2007 • Volume 2, Number 5

About That Cover

All Things GPS: Interview with Col. David Madden, the New GPS Wing Commander
Taking GPS modernization back to basics with a new paradigm

Authenticating GNSS: Proofs against Spoofs, Part 1

Backing Up GNSS with Laser Radar & INS, RAIM in the City, Antenna Phase Wind-Up

GNSS Over China: The Compass MEO Satellite Codes

GPS + GLONASS for Precision
South Carolina’s GNS Virtual Reference Network

More Compass Points: Tracking China’s MEO Satellite on a Hardware Receiver

May/June 2007 • Volume 2, Number 4

Compass MEO Satellite Signals
Initial Observations and Analysis

Don't Look Back
Discarding Galileo's Public-Private Partnership

Envisioning a Future: GNSS System of Systems, Part 3
A Role for C-Band?

Hope beyond the Hype
GNSS and Location-Based Services

Host-Based Processing and Choosing Inertial Sensors

Opening the GATE
Germany’s Galileo Test and Development Environment

Ruth Neilan: The Global Grid Master

Speaking with Authority: Galileo's Lead Agency in a Changing World

Spring 2007 • Volume 2, Number 3

Enhancing the Future of Civil GPS: Overview of the L1C Signal

GLONASS - The Way Ahead

GNSS for the Masses
Innovation the first link of the mass-market value chain

Network Assistance: What Will New GNSS Signals Bring to It?

Turning Point:Trajectory Analysis for Skiers

Two for One: Tracking Galileo CBOC Signal with TMBOC

March/April 2007 • Volume 2, Number 2

Envisioning a Future: GNSS System of Systems, Part 2
 

Pat Fenton: GNSS from the Outside In

Public Private Perplexity
Negotiation woes for Galileo’s Public Private Partnership

Replenishment of the GLONASS Constellation
Key Task of the Russian Space Industry

Self-Aware - Situation Aware
Integrated Handhelds for Dispersed Civil and Military Urban Operations

Signal Acquisition and Search, and Antenna Polarization

The Promise of MEMS to the Navigation Community

Tight Fit
Inertial-Aided GNSS Receiver

January/February 2007 • Volume 2, Number 1

Allison Kealy: The Remarkable Art of the Possible

Designing the World's Smallest
Integrated Navigation System for Micro Aerial Vehicles

Envisioning a Future: GNSS System of Systems, Part 1

GPS: The Way Ahead

Pedestrian Navigation
Hybridization of MEMS and Assisted GPS

Rescue Mission: GPS Applications in an Airborne Maritime Surveillance System

The China Syndrome
The puzzling future of China’s Compass

Weighting GNSS Observations and Variations of GNSS/INS Integration

November/December 2006 • Volume 1, Number 8

Follow the Money
Tracking System for Locating Stolen Currency

Galileo and the Earth’s Gravity Field
Using GNSS for Airborne Gravimetry —  An Overview

GPS in the GSM Handset
When Will It Become Mainstream?

Inside GNSS Wins Award for Editorial Excellence

Land Before Time
The questionable necessity of infinitesimal measurements of time

Precise Point Positioning and Its Challenges, Aided-GNSS and Signal Tracking

The GARDA Project: Building a Galileo Receiver

October 2006 • Volume 1, Number 7

A New Version of the RTCM SC-106 Standard, the Probability of Solving Integer Ambiguities

A System of Systems
Hope on the horizon for GNSS interoperability

Correlators for L2C
Some Considerations

GNSS Forum: This is Not a Test - Future of the Emergency Alert System

Interpolating Reference Data: Kinematic Positioning Using Public GNSS Networks

Making the Case for GBAS: Experimental Aircraft Approaches in Germany

Setting a New Standard: Assisting GNSS Receivers That Use Wireless Networks

September 2006 • Volume 1, Number 6

Atomic Clocks on Satellites and Mitigating Multipath

BOC or MBOC?
The Common GPS/Galileo Civil Signal Design: A Manufacturers Dialog, Part 2

Development Update
Navigation and Positioning in China

Galileo Services
Industry’s Role in Building Galileo Markets

Player Pianos, Sex Appeal, and Patent #2,292,387

The Future Is Now
No bad decisions in the BOC/MBOC debate

The Galileo Code and Others

The Two Worlds of Philip Mattos

July/August 2006 • Volume 1, Number 5

BOC or MBOC?
The Common GPS/Galileo Civil Signal Design: A Manufacturers Dialog, Part 1

GNSS Software Defined Radio: Real Receiver or Just a Tool for Experts?

Orbital Precession, Optimal Dual-Frequency Techniques, and Galileo Receivers

The L2C Study: Benefits of the New GPS Civil Signal

Three's the Charm: Triple-Frequency Combinations in Future GNSS

Uh-Oh, It's UXO!: A Global Differential GPS Solution for Clearing Unexploded Ordnance

Why War, Precisely?
Technological precision won’t save us from our own inaccuracies

May/June 2006 • Volume 1, Number 4

Attitude Adjustment: Devising and Flying a Low-Cost GPS-Based Backup

Galileo Light Show: First Laser Range Measurements to GIOVE-A

GNSS Album: Images and Spectral Signatures of the New GNSS Signals

GNSS Marketplace
When one GNSS system needs to gets up to speed, the others pick up the slack

Karen Van Dyke: Re-Engineering the Airways

MBOC: The New Optimized Spreading Modulation
Recommended for Galileo L1 OS and GPS L1C

Mobile RTK: Using Low-Cost GPS and Internet-Enabled Wireless Phones

New GNSS Frequencies, Advantages of M-Code, and the Benefits of a Solitary Galileo Satellite

April 2006 • Volume 1, Number 3

Adaptive Antenna Arrays, Multi-GNSS Tropospheric Monitoring, and High-Dynamic Receivers

Bring Out the Galileo ICD
The much-needed release of the Galileo Interface Control Document

Builders Notes: Russian GLONASS at the Stage of Active Implementation

Geodesy and Satellite Navigation
A Lighthearted Look at a Strange Relationship

GNSS Meteorology on Moving Platforms
Advances and Limitations in Kinematic Water Vapor Estimation

GPS Help Line
The New GPS Operations Center for Warfighters

On Target: Offshore Scoring of Precision Guided Munitions
Using Tactical Acoustic Realtime Geolocation System

The Big Three: GPSOC, NAVCEN, NOCC
More about the centers that provide a port of entry for any GPS user on the globe

Using Maps as Automotive Sensors
Driver Assistance and Awareness Applications

March 2006 • Volume 1, Number 2

Building Monitors
The Complementary Characteristics of GPS and Accelerometers in Monitoring Structural Deformation

Carrier Phase Ambiguity Resolution, GNSS Use In Cellular Telephone Systems, and New Antennas?

Hardware Versus Software
The physical and political sciences of GNSS

Kalman Filter Face-Off: Extended vs. Unscented Kalman Filters for Integrated GPS and MEMS Inertial

Michael Braasch: Dr. Braasch’s Opus
GPSsoft Technical Director Is a Teacher at Heart

Platforms for a Future GNSS Receiver
A Discussion of ASIC, FPGA, and DSP Technologies

Taking the Show on the Road: GPS Drives U.S. Mobile Resource Management Growth

Testing the Limits of Power
A Methodology for Measuring the Power Consumption of Indoor-Outdoor Tracking GPS Receivers

January/February 2006 • Volume 1, Number 1

Bold Advice: Report of the Defense Science Board Task Force on GPS

Figure 18: Galileo Altimetry Using AltBOC and RTK Techniques

GNSS Interoperability
Achieving a Global System of Systems or “Does Everything Have to Be the Same?”

GNSS Trilogy 2006
Our Story Thus Far

Limits of Compatibility: Combining Galileo PRS and GPS M-Code

Reference Systems, UTC Leap Second, and L2C Receivers?

Sonic Boon: Head Tracking for 3D Audio Using a GPS-Aided MEMS IMU

Tables 1, 2 & 3: Galileo Altimetry Using AltBOC and RTK Techniques

Turning Point
A new age of the Global Navigation Satellite System

What in the World Is the UN Doing About GNSS?

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