From the Magazine

EGNOS and Galileo Track Dangerous Goods

April 1, 2013By

EGNOS availability over Europe, as a precursor of Galileo globally, provides a guaranteed level of positioning accuracy in real time, for tracking vehicles transporting hazardous material. The EGNOS Open Service enhances position accuracy compared to GPS-only. The EGNOS Data Access Service further enhances accuracy and indicates the quality of the position data received from GPS. As a result of the SCUTUM project, EGNOS is now used in the operational transport of dangerous goods by road in Europe. read more

This article is tagged with and posted in Augmentation & Assistance, Fleet Management, From the Magazine, Road

Building a Wide-Band Multi-Constellation Receiver

March 1, 2013By

The authors designed a full-constellation GNSS receiver, using a cost-effective, readily available, flexible front-end, wide enough to capture the frequency from 1555 MHz to 1607 MHz, more than 50MHz. This spectrum width takes into account BeiDou E2, Galileo E1, GPS L1, and GLONASS G1. In the course of their development, the authors used an external OCXO oscillator as the reference clock and reconfigured the platform, developing their own custom wide-band firmware. read more

Showing Smartphones the Way Inside

March 1, 2013By

Using a select set of components, a navigation software development kit can easily be configured to fit a variety of mobile and portable devices. Testing on several current devices demonstrates that the kit’s use of sensors already present in smartphones to enable entertainment can provide 3D positioning when satellite signals are degraded or absent, such as in urban canyons or in deep indoor environments. The solution also provides the heading of the user, the 3D orientation of the device, and the user’s velocity, without restriction on device usage. read more

This article is tagged with and posted in From the Magazine, Personal Navigation

Innovation: A Better Way

March 1, 2013By

Monitoring the Ionosphere with Integer-Leveled GPS Measurements
II am joined by two of my graduate students, who report on an advance in the signal processing procedure for better monitoring of the ionosphere, potentially allowing scientists to get an even better handle on what’s going on above our heads. read more

This article is tagged with and posted in From the Magazine, Innovation

Anti-Jam Protection by Antenna

February 1, 2013By
Figure 6. Outdoor jamming test campaign.

A controlled radiated pattern antenna can be an effective way to protect GPS receivers against jamming. A new CRPA, composed of seven elements, works on the E5a, E5b, E6, L2, and L1 bandwidths. This article reports on radiation pattern measurements of the array in a test facility. read more

This article is tagged with and posted in From the Magazine, GNSS, Signal Processing

Signal Decoding with Conventional Receiver and Antenna

February 1, 2013By
Figure 7  Signal-to-noise-density ratio of E1 (red), E5a (magenta), E5b (blue), and E6 (green) code tracking of Galileo IOV satellite PRN 11 on December 21–22, 2012.

A method of decoding an unknown pseudorandom noise code uses a conventional GNSS antenna and receiver with modified firmware. The method was verified using the signals from the Galileo In-Orbit Validation satellites. read more

Innovation: Getting Control

February 1, 2013By

Off-the-Shelf Antennas for Controlled-Reception-Pattern Antenna Arrays
The antenna is a critical component of any GNSS receiving equipment. It must be carefully designed for the frequencies and structures of the signals to be acquired and tracked. Important antenna properties include polarization, frequency coverage, phase-center stability, multipath suppression, the antenna’s impact on receiver sensitivity, reception or gain pattern, and interference handling. While all of these affect an antenna’s performance, let’s just look at the last two here. read more

This article is tagged with , and posted in From the Magazine, GNSS, Innovation

Network RTK for Intelligent Vehicles

February 1, 2013By

Adoption of network real-time kinematic GNSS positioning can lead to major improvements in vehicle localization, although implementation must overcome some real-world challenges. This article assesses the extent of GNSS signal outage in a motorway environment. The average total GNSS outage period and the average time to resolve ambiguity for the network RTK solution can help assess complimentary sensors for a ubiquitous positioning system. read more

This article is tagged with , and posted in From the Magazine, Road