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Innovation: Self-driving cars in urban neighborhoods

February 1, 2022

How Inertial Systems and GNSS Availability Will Help

Self-driving cars in urban environments can be problematic. The required multi-sensor automated systems will include GNSS, but buildings block and reflect GNSS signals, reducing system availability and accuracy. Researchers from the Illinois Institute of Technology report on how inertial navigation systems coupled with wheel-speed sensors and vehicle dynamic constraints can help.

This article is tagged with autonomous vehicles, GNSS, inertial navigation, Innovation, INS/GPS, self-driving cars, sensor fusion and posted in From the Magazine, Innovation, Transportation

Innovation: Mode N provides alternative PNT for aviation

November 8, 2021

Mode N could meet the need for a reliable alternative PNT system for aircraft navigation. It builds on aspects of existing navigation systems and aviation-certified signals not originally intended for navigation, including some used for communications and surveillance. In this article, a team of researchers from the German Aerospace Center describe Mode N, looking at its signal format, required ground infrastructure, aircraft avionics and the potential position accuracy this system could offer.

This article is tagged with alternative PNT, aviation, avionics, German Aerospace Center, Mode N, Richard B. Langley and posted in From the Magazine, Innovation, Transportation

Figure 1. The three station locations. (Image: Authors)

Innovation: Ionospheric corrections for precise point positioning

August 1, 2021

How Good Are They?

Stanford University and Hexagon are investigating the utility of applying ionospheric corrections to decrease the overall convergence time of precise point positioning (PPP). This article looks at the level of accuracy that can be achieved, the latency of corrections supplied in real-time PPP, as well as the location and coverage of the network of stations required to determine the corrections.

This article is tagged with Hexagon Positioning Intelligence, Innovation, MATLAB tools, PPP, precise point positioning, Stanford University and posted in From the Magazine, Innovation

FIGURE 2. Real data collection set-up: Four GNSS U-blox antennas and one NovAtel SPAN receiver antenna on the vehicle rooftop.

Innovation: Attitude determination and RTK positioning using low-cost receivers

June 1, 2021

Getting It Better

While RTK positioning and attitude determination is readily done with high-end equipment, it is still a challenge to get good results for kinematic platforms with low-cost receivers. In this month’s column, we learn how a team of researchers in France is trying to do just that.

This is posted in From the Magazine, Innovation

FIGURE 7. Road test trajectory with ovals indicating the approximate locations of GPS outages. (Image: Author)

Innovation: Improved navigation through GNSS outages

February 1, 2021

Fusing Automotive Radar and OBD-II Speed Measurements with Fuzzy Logic

The authors discuss how fuzzy logic can be used to get a reliable speed estimate from radar and standard onboard vehicle data, and how these estimates can be combined with inertial measurements and GPS-derived position and velocity in an extended Kalman filter to produce an integrated navigation solution.

This article is tagged with autonomous vehicles, fuzzy logic, GNSS outages, Innovation, vehicle speed and posted in From the Magazine, Innovation, Transportation

FIGURE 1. Components of the quadrotor helicopter. (Photo: K. Mueller, J. Atman, N. Kronenwett & G.F. Trommer)

Innovation: A multi-sensor navigation system for outdoors and indoors

November 20, 2020

Getting the Best in Both Worlds
GPS alone won’t cut it. Thankfully, other navigation sensors can be used to supplement or replace GNSS when the going gets tough for GPS alone.

This article is tagged with Germany, GNSS aiding, IMU, indoor navigation, inertial navigation system, Innovation, Kalman filter, Karlsruhe Institute of Technology, laser rangefinder, MAVs, micro aerial vehicles, navigation solution, navigation system architecture, Richard B. Langley, SLAM, time synchronization and posted in Featured Stories, From the Magazine, GNSS, Innovation

FIGURE 2 . (a) VeroStar antenna element; (b) VeroStar antenna current distribution. (Images: Tallysman)

Innovation: Design and performance of a novel GNSS antenna for rover applications

September 1, 2020

Smaller and Better
In this GPS World 30th anniversary issue Innovation column, we look at the design and performance of an antenna that offers high performance even in challenging environments in a relatively small package.

This article is tagged with dilution of precision, GNSS antennas, low-elevation angle, phase-center variation, Tallysman Wireless, VeroStar and posted in From the Magazine, Innovation, OEM

Photo: FAA William J. Hughes Technical Center

Innovation: Improving ARAIM

June 13, 2020

An approach using precise point positioning
A team of authors from Stanford University discusses a superior approach for ARAIM using the technique of precise point positioning.

This article is tagged with GNSS satellites, horizontal protection level, HPL, PPP, precise point positioning, RAIM, receiver autonomous integrity monitoring, Stanford University, vertical protection level, VPL and posted in Featured Stories, From the Magazine, Innovation

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