Columns and Editorials Archives - Page 7 of 13 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

December 4, 2020

Smartphones Navigate from Street to Indoors with Multi-Sensor Integration

A framework to seamlessly navigate people from urban road traffic to indoor foot traffic uses the phone’s inertial measurement unit, GNSS chipset and camera, aided by an extended Kalman filter and ORB-SLAM. Tests show the framework performing well in both phases, guiding the phone’s user, behind the wheel on a city street, to a spot in an underground parking garage and walking to a meeting inside a large building.

By Inside GNSS

December 3, 2020

The Time and the Place: Dawn

By astral definition, every dawn is new. In the human condition, we see its possibility, its growing brightness bringing hope. Or, in our best selves, we bring hope to it.

By Alan Cameron

December 2, 2020

WAAS: Improving Safety for Civil Aircraft

The United States Federal Aviation Administration’s (FAA) Wide Area Augmentation System (WAAS) uses Hexagon | NovAtel technologies, including reference receivers and signal generators, to provide the accuracy and integrity necessary to safely operate civil aircraft. Here’s a look at the updated technologies and how they enable GPS as a safety of life service for aviation.

By Inside GNSS

October 15, 2020

Multi-GNSS Ambiguity Resolution For Signal Obstruction in PPP

Ambiguity resolution combined with multiple constellations and multiple frequencies proves very effective in reducing Precise Point Positioning convergence time. Such a solution with a 30° mask has a shorter convergence than a float multi-GNSS solution without any obstructions, despite the latter using more satellites.

By Inside GNSS

October 5, 2020

Can Analytical Techniques Guarantee That GNSS Errors Are Bounded Under Rare Conditions? What Techniques Are Available?

Research has focused on methods to analytically determine bounding probability distributions and parameters and identify the conditions under which such bounds are guaranteed to hold. This column summarizes several important examples from this research to highlight the most useful principles and techniques.

By Sam Pullen

October 2, 2020

Across the Lunar Landscape – Exploration with GNSS Technology

As a significant number of people and robotics venture into space, infrastructures providing critical services such as GNSS must be considered on a large extra-terrestrial scale to support these explorations and settlements.

By Inside GNSS

September 30, 2020

Under Attack – Receiver Response to Spoofing: Robustness vs. Resilience

Laboratory tests explore how commercially available receivers respond to meaconing and spoofing, with the goal of developing useful test methodologies and metrics to assess receiver robustness and resilience to real-world spoofing threats.

By Inside GNSS

September 28, 2020

OneWeb LEO PNT: Progress or Risky Gamble?

There are interesting tradeoffs to consider in placing navigation satellites at various orbital heights, including signal power, availability, cost, orbit prediction, receiver computational load and manufacturer motivation.

By Inside GNSS

Low-Power GNSS in the Cloud for IoT

Innovative European developers use emerging GNSS-based Internet of Things technologies to create more power-efficient solutions for a range of logistics, maintenance and other applications.

By Peter Gutierrez

September 24, 2020

The Time and the Place: Threats From Within

It has become fashionable of late in U.S. government circles to undermine the U.S. defense forces. The General Accounting Office (GAO), the Federal Communication Commission (FCC) and the White House (POTUS) have all pitched in, doing their share to weaken the capability and downgrade the tools with which our warfighters enter conflict.

By Alan Cameron

September 23, 2020

Ligado Soars Over Another Obstacle to 5G Domination

A favorable GAO ruling discounted Congressional allegations that the FCC skipped a key legal step before granting Ligado’s controversial application. This positions the broadband company closer to its target and to ongoing interference with GPS signals.

August 18, 2020

Novel Anti-Jamming Techniques for GNSS-based ERTMS Train Control

The digital outputs of a four-channel antenna processing chain consisting of a four-element squared phased array and a 4-coherent channels front-end are processed to identify the presence of a jamming signal. The processing unit then implements a spatial filter to minimize jammer impact. The reconstructed signal is input to a COTS/SDR receiver designed to work in a typical railway environment.

By Inside GNSS

August 3, 2020

Galileo’s High Accuracy Service: Field Experimentation of Data Dissemination Schemes

Galileo will provide a High Accuracy Service (HAS) with positioning performance in the 20-cm range, disseminating Precise Point Positioning (PPP) corrections through the Galileo E6-B signal. Test results of a data encoding and dissemination scheme in different user environments demonstrate a reception time of the corrections in a few seconds in good channel conditions, and less than half a minute with severe channel impairments.

By Inside GNSS

Columns and Editorials

Across the Lunar Landscape: Towards a Dedicated Lunar PNT System...

TRANSIT on Steroids: Doppler-Based GNSS Meets Large LEO Constella...

Smartphones Navigate from Street to Indoors with Multi-Sensor Integration

The Time and the Place: Dawn

WAAS: Improving Safety for Civil Aircraft

Multi-GNSS Ambiguity Resolution For Signal Obstruction in PPP

Can Analytical Techniques Guarantee That GNSS Errors Are Bounded Under Rare Conditions? What Techniques Are Available?

Across the Lunar Landscape – Exploration with GNSS Technology

Under Attack – Receiver Response to Spoofing: Robustness vs. Resilience

OneWeb LEO PNT: Progress or Risky Gamble?

Low-Power GNSS in the Cloud for IoT

The Time and the Place: Threats From Within

Ligado Soars Over Another Obstacle to 5G Domination

Novel Anti-Jamming Techniques for GNSS-based ERTMS Train Control

Galileo’s High Accuracy Service: Field Experimentation of Data Dissemination Schemes