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u-blox Releases Integrated Antenna GNSS Receiver
December 1, 2016

u-blox Releases Integrated Antenna GNSS Receiver

u-blox SAM-M8Q GNSS receiver.

Thalwil, Switzerland-based u-blox has released its SAM-M8Q GNSS receiver with integrated antenna. The compact SAM-M8Q module speeds time to market for GNSS system developers who have limited experience in radio frequency (RF) and antenna design, the company said.

SAM-M8Q, housed in a 15.5 by 15.5 x 6.3 millimeter package, can be embedded in small devices that require location information, the company said. These include asset tracking, telematics systems, and generic automotive after-market applications.

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By Inside GNSS
U.S. DOT GPS/GNSS Adjacent Band Compatibility Assessment Workshop V
October 10, 2016

U.S. DOT GPS/GNSS Adjacent Band Compatibility Assessment Workshop V

A U.S. Transportation Department (DoT) public workshop will address GNSS receiver testing results October 14, 2016 at RTCA, Inc., 1150 18th ST NW, Suite 910, in Washington, DC.

The event begins at 10 a.m. and ends at 4 p.m.EDT.

Workshop members, as part of DoT’s fifth GPS Adjacent Band Compatibility Assessment (ABC) effort, will discuss GNSS receiver testing that includes non-certified aviation, cellular, general location and navigation, high precision and networks, timing, and space-based receivers, the agency said.

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By Inside GNSS
Single Versus Multiple
September 8, 2016

Single Versus Multiple

Dr. Kyle O’Keefe, University of Calgary

In the beginning, there was just one GNSS — the Global Positioning System — and just one fully available signal on the L1 frequency.

Eventually, some clever scientists discovered how to exploit certain characteristics of the encrypted L2 signal to come up with so-called codeless and semi-codeless techniques that enabled dual-frequency positioning. This hastened the development of user equipment that used the carrier phase of signals as well as the code to deliver high-precision results.

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By Inside GNSS
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GNSS Antennas with Dr. Inder Gupta
May 29, 2016

GNSS Antennas with Dr. Inder Gupta

Dr. Inder Gupta, The Ohio State University
Chris Bartone, Ohio University

GNSS receivers seem to get all the attention. Go to any technical GNSS conference and the lion’s share of presentations are about receiver design and techniques: better algorithms, signal processing, integration with other sensors, spoofing detection, and on and on.

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By Inside GNSS
Military GPS Receiver Advances Could Help Trim Satellite Costs
May 19, 2016

Military GPS Receiver Advances Could Help Trim Satellite Costs

Advanced military receivers using the sort of modern multi-channel, multi-constellation capabilities already available commercially, could enable the Air Force to focus its anti-jam efforts on the ground, simplifying future GPS satellites and lowering their cost. Moreover, experts told Inside GNSS, the cutting-edge receivers could be deployed years before the anti-jam capability planned for the new GPS III satellites would be fully available.

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By Dee Ann Divis
What are the fundamentals of an effective GNSS test plan?

What are the fundamentals of an effective GNSS test plan?

Q. What are the fundamentals of an effective GNSS test plan?  

A. One aspect of GNSS development that engineers often find challenging is the lack of common testing standards and procedures. This can make life difficult for the engineer tasked with constructing a test plan for a new GNSS-enabled system. How much testing is proportionate, at which stages of development? What are the key performance parameters to measure? What apparatus is best suited to the application, and what are the appropriate pass/fail criteria?

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By Inside GNSS
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GAGAN-500px.jpg
January 18, 2016

GAGAN — India’s SBAS

The GPS Aided Geo Augmented Navigation (GAGAN) system was developed by the Indian Space Research Organization (ISRO), together with Airports Authority of India (AAI), to deploy and certify an operational satellite-based augmentation system (SBAS). The system’s service area covers the Indian Flight Information Region (FIR), with the capability of expanding to neighboring FIRs. 

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By Inside GNSS
Software-Defined GNSS Simulator: A Step Forward
June 29, 2015

Software-Defined GNSS Simulator: A Step Forward

A few studies (by universities and industry) have shown the feasibility of simulation of real-time digital intermediate frequency (IF) signals based on a graphics processor unit (GPU). And a couple of articles have also demonstrated use of a universal software radio peripheral (USRP)–based software-defined radio (SDR) as a simulator (in playback mode) in real test environments.

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By Inside GNSS
GNSS Sol Header_0_0_1_0.jpg
May 26, 2015

Are there special considerations for dealing with raw GNSS data?

Q: Are there special considerations for dealing with raw GNSS data?

A: Most GNSS users are only interested in position, velocity, and/or time (PVT) information provided by a receiver. In fact, most mass-market GNSS receivers (e.g., those in cell phones or in your vehicle) only provide PVT information along with some supporting data (such as the number of satellites tracked, dilution of precision, course over ground, and so forth).

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By Inside GNSS
How does a GNSS receiver estimate velocity?
March 14, 2015

How does a GNSS receiver estimate velocity?

Equations 1 – 11

Q: How does a GNSS receiver estimate velocity?

A: Stand-alone single-frequency GNSS receivers represent the largest slice of the commercial positioning market. Such receivers operate mainly in single point position (SPP) mode and estimate velocity either by differencing two consecutive positions (i.e., approximating the derivative of user position) or by using Doppler measurements related to user-satellite motion.

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By Inside GNSS
Reliable GPS-Based Timing for Power Systems
November 17, 2014

Reliable GPS-Based Timing for Power Systems

Efficient power transmission and distribution would benefit from synchronized near–real-time measurements of voltage and current phasors at widely dispersed locations in an electric power grid. Such measurements also could enable effective real-time system monitoring and control, which are considered to be the key to preventing wide-scale cascading outages like the 2003 Northeast Blackout.

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By Inside GNSS
Evaluating the Performance of Navigation Payloads

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.

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By Inside GNSS
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