From the Magazine

Research: MEMS IMU carouseling for ground vehicles

September 13, 2016By
Collin-Jussi

Micro-electromechanical system (MEMS) gyroscopes have advantages for orientation sensing and navigation as they are small, low cost and consume little power. However, the significant noise at low frequencies produces large orientation errors as a function of time. Controlled physical rotation of the gyroscope can remove the constant part of the gyro errors and reduce low-frequency noise. As adding motors for... read more

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

Innovation: Galileo cycle-slip detection

September 1, 2016By and
FIGURE 3.  Statistical and absolute thresholds.

How four frequencies help when the ionosphere is disturbed The authors explore how cycle slips in Galileo carrier-phase measurements can be more effectively detected using four frequencies. MORE SATELLITES OR MORE SIGNALS? That was the question put to the delegates at GNSS Election ’08, the stimulating and amusing entertainment provided at the GPS World Leadership Dinner held in conjunction with The... read more

Low-cost precise positioning for automated vehicles

gps-hud-PRINT-O

Carrier-phase differential GNSS produces mass-market centimeter accuracy A dense reference network facilitates low-cost carrier-phase differential GNSS positioning with rapid integer-ambiguity resolution. This could enable precise lane-keeping for automated vehicles in all weather conditions. Strong demand for low-cost precise positioning exists in the mass market. Carrier-phase differential GNSS (CDGNSS) positioning, accurate to within a few centimeters even on a moving platform,... read more

Harxon antenna aimed at marine positioning

August 26, 2016By
The HX-CS7615A Harxon marine antenna.

Harxon has released a utility beacon antenna — HX-CS7615A — to professionally solve marine satellite positioning challenges. The HX-CS7615A supports GPS L1/L2, GLONASS L1/L2 BDS B1/B2/B3 and beacon frequencies (282.6 to 326 KHz), which greatly overcomes the defects of long-distance transmission limits, the company said. In addition, combining wide frequencies in one antenna makes the new device more cost effective. Inside, a... read more

System of Systems: Galileo birds active, faulty launch victims still viable

August 23, 2016By
Galileo orbits viewed from above.

Galileo birds active Faulty launch victims still viable Europe’s fifth and sixth Galileo satellites, salvaged from their faulty 2014 Soyuz launch, will begin broadcasting working navigation signals for test purposes, for the benefit of receiver manufacturers, service providers and scientific researchers. The European Commission will decide later whether the two satellites will become part of the operational Galileo constellation. The... read more

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

Air Force upgrades to better field reference system for testing GPS denial

Non-GPS positioning system, White Sands North Range. X = transmitter site.

Can’t Deny the Truth: Defeating the Jamming Threat Initial Operational Capability for the Ultra High-Accuracy Reference System has been declared by the U.S. Air Force. Even when GPS is being completely jammed, UHARS provides extremely accurate positioning, navigation and time — more accurate than GPS — over the large area of White Sands Missile Range in New Mexico. Amid a... read more

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

Into the cold zone: UAV platform flies high in Antarctica

July 31, 2016By
Tiburon Jr. can be assembled in 15 minutes, an important feature in extreme environments.

In February, mechatronics lead Kevin Bass of Intuitive Machines and contracted pilot Mike Laible successfully flew multiple runs with an unmanned aerial vehicle platform, Tiburon Jr., on the coast of Antarctica. From Wilkins Aerodrome in the southeast, the team launched Tiburon Jr. and collected valuable testing and environmental data. Battling harsh weather and constantly changing conditions, the team flew the... read more

NDGPS loses interior, keeps coast

July 25, 2016By and

Heartland Corrections Services Now Commercial or WAAS-only The U.S. Coast Guard, Department of Transportation and Army Corps of Engineers have reduced the number of Nationwide Differential Global Positioning System (NDGPS) sites that will be decommissioned. The course correction keeps a coastal and Mississippi River network of stations largely intact, while discontinuing inland services. Last year at this time, the agencies... read more

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