GNSS

Lockheed Martin-Built GPS Satellites Reach 200 Years of Operational Life

September 4, 2014By
gps-release-92

The U.S. Air Force’s fleet of GPS Block IIR and IIR-M satellites, manufactured by Lockheed Martin, have reached 200 collective years of operational life. The 20 satellites make up about two thirds of the current GPS constellation. Originally launched between 1997 and 2009 to add capabilities to the GPS constellation and to replace other aging satellites, the 12 GPS IIR and... read more

This article is tagged with and posted in Aviation & Space, Defense News, GNSS News, GPS Modernization, Latest News

SVN-35 to Resume L-Band Transmission

September 4, 2014By

Starting Friday, September 5, GPS satellite SVN-35 will resume transmitting L-band signals using PRN03, according to a Notice Advisory to Navstar Users (NANU) issued today. According to GPS World Almanac editor Richard Langley, the resumption is being done in an effort to determine the exact status of SVN-35′s remaining clock. However, the satellite will remain unusable as the Air Force conducts its tests. Below... read more

This article is tagged with and posted in GNSS News, GPS Modernization, Latest News

ION Seeks Abstracts for Pacific PNT 2015, PTTI Registration Opens

September 2, 2014By

Abstract submissions are now being accepted for The Institute of Navigation’s (ION) Pacific PNT Conference, to be held April 20-23, 2015, at the Waikiki Beach Marriott, Honolulu, Hawaii. Abstracts are due November 14, 2014. Pacific PNT, where “East Meets West in the Global Cooperative Development of Positioning, Navigation and Timing Technology,” brings together policy and technical leaders from Japan, Singapore, China, South... read more

Innovation: How Deep Is That White Stuff?

September 1, 2014By
FIGURE 6. Aerial view of the forested site (RN86) around the GPS antenna (marked with a circle).

Using GPS Multipath for Snow-Depth Estimation
In this month’s column, we look at a technique that uses interference fringes generated by signals arriving at an antenna directly from GPS satellites and those reflected by snow surrounding the antenna to measure its depth and how it varies over time. GPS for measuring snow depth; who would have thought? read more

This article is tagged with , and posted in Algorithms & Methods, Innovation

Multi-Constellation. Dual-Frequency. Single-Chip.

September 1, 2014By
NAPA-OpeningFigure

This integrated circuit supports simultaneous reception and processing of the GPS L1/L5, Galileo E1/E5a, and GLONASS G1 signals with 40 tracking channels. The dual-band analog RF front-end is integrated on the same mixed-signal chip as the baseband hardware, including an embedded processor to close the tracking loops: overall, a compact, low-power, and low-cost solution. read more

This article is tagged with , and posted in From the Magazine, Mobile Devices, Receiver Design, Sensor Fusion

Assured PNT for Our Future: PTA

September 1, 2014By
GDGPS-Parkinson-O

Actions Necessary to Reduce Vulnerability and Ensure Availability By Brad Parkinson (From the 25th Anniversary GNSS History Special Supplement) Introduction About 40 years ago, we had a vision for positioning, navigation, and timing (PNT). That vision was more than successful, and became known as GPS. In some respects we have been almost too successful: PNT is frequently taken for granted.... read more

Out in Front: 25 Years Young

September 1, 2014By

When I was a young man, the moment seemed like all there was, all there needed to be. Why plan? Why reflect? The days were just packed. Once I turned 25 — or somewhere around there — intimations dawning of my own mortality, I began to look both forward and back. It seemed like a good idea, perhaps even an... read more

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

Slung Low, Sweet Satellites: Galileo Anomaly Update

August 28, 2014By and
Galileo_satellites_inside_launch_fairing_O

The wording is terse, the intent clear. “Following the failure on Friday August 22nd to inject Galileo satellites 5 and 6 into the correct orbit, the European Commission has requested Arianespace and the European Space Agency (ESA) to provide full details of the incident, together with a schedule and an action plan to rectify the problem.” This is the only... read more