A: System Categories Archives - Page 132 of 233 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

Evaluating the Performance of Navigation Payloads

As a navigation satellite transmits multiple signals on single frequency (e.g., Open Service and Restricted Service over L5 Band), these are combined on a common carrier to comprise a composite signal. This composite signal passes through navigation payload subsystems such as an up-converter, traveling wave tube amplifier (TWTA), filters, and so on. These subsystems may introduce adverse effects on the signal, such as amplitude and phase distortion, nonlinear effects, gain imbalance, IQ imbalance, and phase noise.

By Inside GNSS

Tracking IRNSS Satellites

Figure 2: Sky plot showing position of IRNSS and GPS satellites over Helsinki Finland on November 6, 2014 at 16:10 local time.

The Indian Regional Navigation Satellite System (IRNSS)] is designed as a stand-alone regional navigation system with a primary service area extending up to 1,500 kilometers from the Indian land mass. Finland lies north of 60°N latitude more than 5,000 kilometers away from India, as shown in Figure 1 (see photo at the top of this article).

By Inside GNSS

Higher Aspirations for GNSS

GPS Space Service Volume (SSV) Requirements/Performance Parameters

New space missions such as the robotic repair and recovery of damaged or errant communication satellites may become possible with the aid of an emerging class of receivers that is able to use GPS signals for navigation in orbits thousands of kilometers above the middle Earth orbit (MEO) GPS constellation itself.

By Dee Ann Divis

EU and Russia: Lost in Space?

Russia’s involvement in the Ukraine crisis has turned much of public opinion in the West against that country, in particular souring the relationship between the European Union (EU) and Russia. And, while the ceasefire signed in September technically is still in force, the EU-Russia rift is far from smoothed over.

By Peter Gutierrez

What are the actual performances of GNSS positioning using smartphone technology?

Tables 1, 2, 3 & 4

Q: What are the actual performances of GNSS positioning using smartphone technology?

A: “Where I am?” is the typical question asked by a person when visiting a new city or unknown place. Knowing one’s own location is generally a basic necessity for people, both in indoors and outdoors.

By Inside GNSS

November 14, 2014

First GPS III Launch Slips to FY17

GPS III core structure at Lockheed Martin facility. Lockheed Martin photo

The launch of the first GPS III satellite could slip to as late as March 2017, further delaying a modernization program that already has been pushed back repeatedly by budget cuts and technical problems.

“The first GPS III launch is tentatively considered for the first half of FY17, based on booster availability and Air Force launch priorities,” a spokesman for the Space and Missile Systems Center told Inside GNSS.

By Inside GNSS

Most Tariffs on GPS Equipment Could Soon disappear

U.S. Trade Representative Michael Froman

Tariffs on GPS devices in more than 70 countries could disappear in a matter of months now that the U.S. and China have worked through an impasse on expanding the Information Technology Agreement (ITA).

By Inside GNSS

Topcon Engineers Track New GLONASS Signal

Implementation of code-Phase structures for GLONASS signals ?/?, L2C and L3

Topcon Positioning Group has announced that its latest GNSS reference receiver has tracked a new signal from the GLONASS constellation.

The GLONASS-M 55 satellite was launched in June and is equipped
with an experimental payload capable of transmitting CDMA signals in the
Russian GNSS system’s L3 frequency band centered at 1202.025 MHz. According to the company, Topcon engineers successfully tracked the signal using the NET-G5
receiver during a series of recent tests at the Topcon Technology Center
in Moscow, Russia.

By Inside GNSS

November 10, 2014

ESA Will Attempt to Improve Orbits of Errant Galileo Satellites

The European Space Agency (ESA) announced plans today (November 10, 2014) to implement a series of maneuvers to reposition one of two Galileo full operational capability (FOC) satellites left in the wrong orbit this summer, as a prelude to its health being confirmed.

The aim is to raise the lowest point of the satellite’s orbit — its perigee — to reduce the radiation exposure from the Van Allen radiation belts surrounding Earth, as well as to put it into a more useful orbit for navigation purposes.

By Inside GNSS

November 6, 2014

Tallysman Launches Smart GPS-GLONASS Antenna

Tallysman has introduced the TW5340 “smart” antenna that pairs Tallysman‘s Accutenna technology with STMicroelectronics’ Teseo II GNSS receiver.

The TW5340 is a multi-constellation GNSS antenna that provides simultaneous GPS/GLONASS/SBAS reception and is designed for use in professional grade applications such as precision timing, network synchronization, or low-current and tracking/positioning applications.

By Inside GNSS

u-blox Introduces Tiny Multi-GNSS Module

Swiss-based u‑blox launched its new EVA‑M8M stand-alone positioning module today (November 6, 2014), bringing concurrent multi-GNSS capabilities into the company’s compact EVA footprint.

By Inside GNSS

October 30, 2014

UK eLoran Now in Operation to Back Up GPS

Technology to counter the threat of GNSS jamming is now available at Dover and along the east coast of the United Kingdom as the island nation continues to implement an enhanced Loran (eLoran) system that is setting an example for the world.

By Inside GNSS

Under Congressional Pressure, U.S. Agencies Maneuver on eLoran Relaunch, GPS Backup

Rep. Duncan Hunter, chairman House Subcommittee on Coast Guard and Maritime Transportation

Prodded by Congress, the federal government is reexamining its decision to abandon eLoran, a network of ground stations capable of supplying essential timing and positioning data to power, phone, and other critical networks if something happed to GPS.

By Inside GNSS

A: System Categories

Europe Prepares Its Part of GNSS-Enhanced Search & Rescue Se...

Reliable GPS-Based Timing for Power Systems...

Evaluating the Performance of Navigation Payloads

Tracking IRNSS Satellites

Higher Aspirations for GNSS

EU and Russia: Lost in Space?

What are the actual performances of GNSS positioning using smartphone technology?

First GPS III Launch Slips to FY17

Most Tariffs on GPS Equipment Could Soon disappear

Topcon Engineers Track New GLONASS Signal

ESA Will Attempt to Improve Orbits of Errant Galileo Satellites

Tallysman Launches Smart GPS-GLONASS Antenna

u-blox Introduces Tiny Multi-GNSS Module

UK eLoran Now in Operation to Back Up GPS

Under Congressional Pressure, U.S. Agencies Maneuver on eLoran Relaunch, GPS Backup