GPS Blog
 


GPS/GNSS Blog (RSS Feed)

Tags:
Speed, programming, functionality, GNSS, GSS6400, Pseudoranges, GUI, Pseudolites, Single Generator, QZSS, GPS, Compass/Beidou, IP Testing, AX/4000, Static Navigation, SVN_49, Railway, IVNS, GNSS Simulation, GNSS Testing, Galileo, GPS Modernization, GNSS Simulators, Multi-GNSS, GNSS Receivers, Inertial Sensors, Beidou, Compass, GPS Simulation, GPS Augmentation, Record & Playback, GLONASS, Testing, Location Test, , Sensors, Vulnerability, Security, Spoofing, GPS Testing, GNSS Simulator, GPS Jamming, GPS Spoofing, GPS interference, GNSS interference, Robust PNT, Timing, networks, local wireless area network testing, View All Blogs

What Does 2017 Hold for GNSS Applications?
With Galileo now offering initial services, IRNSS having a full constellation, and rapid developments in a number of commercial industries, 2017 promises... read more
1/10/2017 10:19:51 AM - Will Thornton
Tags: GPS, GNSS, Timing

GPS Disruption is a Growing Problem for Aviation, Reports Show
Incident reports filed by aviation professionals to the online Aviation Safety Reporting System suggest GPS interference is getting... read more
11/7/2016 8:16:54 AM - Guy Buesnel
Tags: GPS interference, GNSS interference, GPS jamming, Robust PNT

Pokémon GO Shines a Light on the Dark Art of GPS Spoofing
Pokémon GO, the wildly popular augmented-reality game, has thrust the dark art of GPS spoofing into the limelight. But what exactly is spoofing, and who... read more
7/13/2016 8:29:46 PM - Guy Buesnel
Tags: GPS Spoofing

Testing for Network PRTC Timing Accuracy in Accordance with G.8272
Times are changing in the world of telecommunication networks. To meet demand for streaming video and other high-speed, high-bandwidth services, mobile... read more
1/23/2016 11:21:36 AM - Richard Chan
Tags: GNSS Simulation

GPS Spoofing Is Now A Real Threat- Here is What Manufacturers of GPS Devices Need to Know
Faking GPS signals used to be limited to James Bond films and navigation specialists. But a demonstration at DEFCON 23 shows it's now poised to become a... read more
11/23/2015 12:00:48 PM - Guy Buesnel
Tags: GPS Jamming

How Leap Seconds Can Interfere with GNSS Receivers
A new alert from the US Coast Guard Navigation Center (NAVCEN) has highlighted that some GPS receivers will have problems handling an upcoming leap second... read more
5/14/2015 6:57:32 PM - Rahul Gupta
Tags: GNSS, GPS

Four Key GPS Test Considerations for Drone and UAV Developers
Many drones rely on global navigation satellite systems to fly an accurate course. We look at some GPS test considerations that UAV designers should take... read more
5/4/2015 11:39:27 AM - Rahul Gupta
Tags: GNSS Simulator

Four Questions to Ask Before Testing GPS in Consumer Devices
Outside of in-car satnav, satellite positioning capabilities used to be a rarity in consumer devices. But one glance at the lineup from this year's... read more
4/30/2015 11:45:20 AM - Rahul Gupta
Tags: GPS Testing

GPS Spoofing: Don't let it harm your Electricity Supply
On 19th January, Security Week... read more
4/29/2015 2:03:18 PM - Guy Buesnel
Tags: Spoofing

GNSS vulnerability can be solved by using more GNSS
Recent events with GLONASS and with GPS in Australia demonstrated that navigation systems are vulnerable to software problems or glitches. The threat of... read more
11/12/2014 10:15:21 AM - Guy Buesnel
Tags: GNSS, GPS, Vulnerability

A Big + to ION GNSS+ Conference: Understanding the Reliability of Satellite and Non-Satellite Based Location Technologies
The biggest navigation conference of the year, The Institute of Navigation's GNSS+, came to a... read more
11/7/2014 6:22:40 PM - John Pottle
Tags: GPS, GNSS, Sensors

Prepare for the Next GNSS Outage
As you may be aware, recent incidents of GNSS errors have impacted the performance of some receivers. The GLONASS outage, beginning of April, and a number... read more
6/25/2014 1:50:13 PM - Rahul Gupta
Tags: Location Test

Uncertainties in time and space – Mitigating threats in GNSS signals
There's no question that society is focused on the accuracy of time, so much so that we manage our lives by smartphones linked to the atomic clocks of the... read more
12/12/2013 1:51:57 PM - Steve Hickling
Tags: Testing

What's next for Automotive Positioning Systems?
Whether it's a Spanish university revealing a smarter in-vehicle SatNav or... read more
6/19/2013 11:10:32 AM - Rahul Gupta
Tags: 

BeiDou-2: The 3 Things Every GNSS Technology Developer Should Know
Whether you are developing a smartphone for immediate global sale, or designing the Global Navigation Satellite System (GNSS) technology of the future,... read more
6/14/2013 10:45:30 AM - Stuart Smith
Tags: BeiDou

Testing Wi-Fi Connectivity in Commercial Devices on the Production Line

Wi-Fi is becoming quite ubiquitous. In smartphone and tablet devices, it's increasingly used as an avenue for offloading 3G and 4G data use when the... read more
10/2/2012 8:09:20 AM - Paul Argent
Tags: 

New GNSS Testing Solutions for Automotive R&D
The automotive industry has long since represented one of the most influential and exciting areas of global positioning R&D.

Mid-way... read more
9/28/2012 9:18:51 AM - Rahul Gupta
Tags: 

Faster, Surer Industry Certification for GNSS-Enabled Products
Today, the satellite positioning and navigation market is moving with phenomenal speed.

Most vendors and manufacturers of GNSS-enabled... read more
9/28/2012 8:49:32 AM - Stuart Smith
Tags: 

Including Human Motion in the R&D of GNSS/Inertial Sensor Systems

Accelerometers, barometers, magnetometers and gyroscopes are all common components in the latest generation of smartphones—and the information such... read more
9/27/2012 2:49:47 PM - Rahul Gupta
Tags: 

The Uses of Automated Testing Software: Integrating a GNSS Receiver
For manufacturers of location-aware devices, the decision on where to place the GPS/GNSS receiver within the overall product design is a critical... read more
9/24/2012 8:03:22 AM - Andy Walker
Tags: 

MEMS Sensor Fusion—The Key to Ubiquitous Positioning?
The ability to find out exactly where we are, wherever we are, is something many of us are already starting to take for granted.

As... read more
9/21/2012 12:34:26 PM - Rahul Gupta
Tags: 

Quality and Cost: Two Good Reasons why Record and Playback Beats Live Sky
The Record and Playback approach to performance testing GNSS-enabled devices has been with us for some time now. Spirent's own, industry-leading read more
9/11/2012 8:35:38 AM - Rahul Gupta
Tags: Record & Playback

Limitations of Live Sky Testing in a Production Environment
Should manufacturers use live satellite signals to test location-aware devices?
One challenge for... read more
8/20/2012 9:45:36 AM - Andy Walker
Tags: GPS Simulation

Choosing the Right Chipset for your Device
The Uses of Automated Testing Software: Choosing a GNSS Chipset
Selecting a GNSS chipset for a new location-aware device is a critical R&D... read more
8/14/2012 1:47:29 PM - Stuart Smith
Tags: 

Five Tips for Reducing the Time and Cost of Manufacturing Test
Manufacturers of the latest consumer devices are under pressure to produce more units, faster, to satisfy global demand. According to Gartner, for... read more
7/17/2012 9:31:27 AM - Rahul Gupta
Tags: 

A Review of the Possible Sources of Common GPS Errors
Today, GPS applications and services are everywhere, and accessible to almost everyone. In the UK you can now purchase a portable "SatNav" system,... read more
7/6/2012 1:49:27 PM - John Pottle
Tags: 

GNSS Receivers Move from Precision Agriculture to the Backyard
One of the most economically successful applications of GNSS has been in precision agriculture: a concept that was developed in the USA during the 1980s.... read more
7/2/2012 3:19:44 PM - Andy Walker
Tags: 

Simulation Equals Simplification
One of the most important benefits of testing a GNSS receiver using an RF simulator rather than using either live or recorded signals from real-world... read more
6/29/2012 9:46:29 AM - Andy Walker
Tags: GPS Simulation

Why is Reacquisition Time Important?
One of the critical performance parameters for almost any GNSS receiver is reacquisition time–or how long it takes the receiver to make sense of the... read more
6/27/2012 12:30:45 PM - Andy Walker
Tags: 

What are the Benefits of Narrow Correlator Spacing?
Narrow correlator spacing is a key technique for multipath mitigation in GNSS receivers. Whereas earlier GPS receivers used a 1.0 chip spacing in their... read more
6/15/2012 9:08:11 AM - Andy Walker
Tags: 

What is the SCDM?
The SCDM is the System for Differential Correction and Monitoring, which is a key part of a Russian-operated satellite based augmentation system (SBAS)... read more
6/13/2012 2:38:58 PM - Andy Walker
Tags: 

The Importance of Repeatability in GNSS Receiver Testing
In any testing regime at any stage in the lifecycle of a GNSS receiver repeatability of tests is essential. Regardless of whether you are designing a... read more
6/13/2012 2:35:50 PM - Andy Walker
Tags: GNSS Receivers

How does a GNSS Account for Relativity?
Among the inevitable problems with any global navigation satellite system, relativistic effects such as time dilation, gravitational frequency shift and... read more
6/8/2012 10:40:23 AM - Andy Walker
Tags: Pseudoranges

GPS Modernization and the L1C Signal
Another of the major improvements that is scheduled in the modernization of the Global Positioning System (GPS) is the L1C signal. This is a freely... read more
6/8/2012 10:36:28 AM - Andy Walker
Tags: GPS Modernization

Vehicle Models in GNSS Receiver Testing
One of the most important aspects of testing the reliability and performance of any GNSS receiver is testing the dynamic performance of the system in its... read more
6/8/2012 10:33:04 AM - Andy Walker
Tags: GNSS Receivers

GNSS Receivers on Course for Sporting Precision
One of the fastest-growing sectors for the use of GNSS receivers is the sporting goods industry, where data from such devices are used for a wide range of... read more
5/29/2012 1:28:23 PM - Andy Walker
Tags: GNSS Receivers

What is an RTK Receiver?
An RTK receiver is a high-accuracy dual-frequency device that uses the real-time kinematic (RTK) technique for centimetre-level accuracy in surveying... read more
5/21/2012 9:32:06 AM - Andy Walker
Tags: 

What is MEO?
MEO, or medium Earth orbit, is the region of space surrounding the Earth that is commonly used by navigation satellites. Also referred to as intermediate... read more
5/21/2012 9:24:17 AM - Andy Walker
Tags: 

Faraday Cages and GNSS Reception
Although the concept of the Faraday cage is generally well understood, it is all too easy to fail to appreciate that many of today's structures can easily... read more
5/21/2012 9:11:40 AM - Andy Walker
Tags: 

What is DGPS?
DGPS, or differential GPS, is a ground-based enhancement system for the Global Positioning System. The system comprises a network of ground stations, each... read more
5/21/2012 8:59:47 AM - Andy Walker
Tags: 

The Increasing Influence of GPS Timing
The old saying "time is money" has never been more true than today, with almost every aspect of modern living governed to some extent by precision timing.... read more
5/16/2012 9:03:31 AM - Andy Walker
Tags: 

What is Carrier Phase Tracking?
Carrier phase tracking is a highly accurate means of positioning used in GNSS surveying applications. The product of the period of the carrier frequency... read more
5/7/2012 8:26:19 AM - Andy Walker
Tags: 

Why Test GNSS Receivers for EMC?
Although there is no specific product standard for EMC in GNSS receivers, testing for immunity to electromagnetic interference has to be an essential part... read more
5/7/2012 8:24:09 AM - Andy Walker
Tags: 

What is the Land Mobile Multipath Model?
Developed specifically to meet the demands of the mobile phone industry, the Land Mobile Multipath (LMM) model provides a pragmatic approach to assessing... read more
5/7/2012 8:19:59 AM - Andy Walker
Tags: 

Will Your GNSS System Manage the Upcoming Leap Seconds Insertion?
This free of charge Spirent... read more
2/1/2012 9:15:52 AM - Stuart Smith
Tags: 

Automate Your GNSS Receiver Testing
"We are in Testing Times", a phrase being used more and more these days in relation to many things. However, 'Testing Times' is also a concern to anyone... read more
12/15/2011 1:42:08 PM - Stuart Smith
Tags: GNSS Receivers

A Review of the Possible Sources of Common GPS Errors
Today, GPS applications and services are everywhere, and accessible to almost everyone. In the UK you can now purchase a portable "SatNav" system,... read more
10/25/2011 9:58:12 AM -
Tags: 

Simulating Roadside Buildings with SimGen Vertical Planes Feature
One of the major considerations in designing a GNSS receiver for automotive applications is to ensure that the performance is not unduly affected by... read more
10/25/2011 9:49:04 AM - Andy Walker
Tags: GNSS Receivers

High-Precision GNSS Market Set For Growth
With the latest report from market research guru ABI Research predicting that the high-precision GNSS sector is set to double in size between 2011 and... read more
10/21/2011 9:39:34 AM - Andy Walker
Tags: GNSS Receivers

What is PRN Code?
Pseudorandom noise (PRN) codes are an important element of code division multiple access (CDMA) based satellite navigation systems. Each satellite within... read more
10/19/2011 3:14:04 PM - Andy Walker
Tags: GNSS Receivers

Why Test GNSS Receivers for EMC?
Although there is no specific product standard for EMC in GNSS receivers, testing for immunity to electromagnetic interference has to be an essential part... read more
10/19/2011 2:54:27 PM - Andy Walker
Tags: GNSS Receivers

COMPASS on Track for Global Coverage
While the Russian GLONASS constellation is slowly approaching full operational status, developers of future multi-GNSS systems also need to focus on the... read more
10/19/2011 2:39:30 PM - Andy Walker
Tags: GNSS Receivers

What is CNAV?
CNAV is the name for the civilian navigation message that will be carried by the modernized GPS system. And while the CNAV message will carry similar data... read more
10/10/2011 10:13:33 AM - Andy Walker
Tags: GLONASS, Multi-GNSS

GNSS Chipset Expansion Must be Underpinned by Quality
With a recent report predicting that consumer and precision GNSS receiver IC shipments will reach two billion units by 2016, it is important to remember... read more
7/2/2011 9:09:57 AM - Andy Walker
Tags: Inertial Sensors

How will GPS/GLONASS Chipset Integration Help the Consumer?
The integration of GPS and GLONASS systems within the same receiver offers many advantages to both the manufacturer and the end user. And now that this... read more
6/16/2011 3:52:00 PM - Andy Walker
Tags: GNSS Receivers, GLONASS

Do You Need a Screened Enclosure to Test a GNSS Receiver?
The traditional logic that all RF testing should be carried out in a screened enclosure has much to recommend it. But do you always need to go to this... read more
6/15/2011 7:47:41 AM - Andy Walker
Tags: GNSS Receivers

GNSS Record & Playback Complements Testing with Simulators
All Global Navigation Satellite Systems (GNSS) work by measuring the transmission-time delay from a satellite to the receiver. With a clear view of the... read more
6/10/2011 3:25:38 PM - Andy Walker
Tags: Record & Playback

What is Wi-Fi Positioning?
Although satellite-based navigation systems are the preferred means for establishing location in "open" terrain, they do suffer shortcomings in areas... read more
6/1/2011 4:40:57 PM - Andy Walker
Tags: Multi-GNSS

What is Binary Offset Carrier Modulation?
Binary offset carrier modulation (or BOCM) is a split-spectrum modulation scheme used by the Galileo navigation satellite system. BOCM is a square... read more
5/31/2011 11:15:29 AM - Andy Walker
Tags: Galileo

What is GAGAN?
The GPS Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system (GAGAN) is a space-based augmentation system (SBAS) funded by the Indian... read more
5/23/2011 7:16:40 PM - Andy Walker
Tags: GPS Augmentation

LightSquared GPS Testing: Spirent's Perspective
The FCC, LightSquared and GPS industry have all agreed that the many questions around the potential for LightSquared's proposed L-Band... read more
5/18/2011 10:03:38 PM - Andy Walker
Tags: GPS Simulation

What is CNSS?
CNSS is the Compass Navigation Satellite System, which will eventually comprise up to 30 medium-earth-orbit satellites and five geosynchronous satellites... read more
5/18/2011 9:49:23 PM - Andy Walker
Tags: Galileo, Beidou, Compass

Record and playback systems in multi-GNSS receiver testing
Record and playback systems (RPSs) such as the new read more
5/18/2011 9:39:34 PM - Andy Walker
Tags: GNSS Simulation

What is a GPS almanac?
In the wider world, an almanac is an annual publication dedicated to information such as weather forecasts, tide tables, lunar cycles etc. A typical... read more
5/18/2011 9:09:24 PM - Andy Walker
Tags: GNSS Receivers

GPS Modernization: What is M-Code?
An important part of the current GPS modernization program, M-code is the name given to a new signal that is designed to improve both the security and... read more
5/18/2011 9:04:07 PM - Andy Walker
Tags: GPS Modernization

What is Dilution of Precision in GNSS Receivers?
Although a GNSS receiver requires only four satellite signals to provide a complete positional fix in three dimensions, the accuracy of this fix depends... read more
4/30/2011 9:20:01 AM - Andy Walker
Tags: GNSS Receivers

What is RAIM?
RAIM stands for receiver autonomous integrity monitoring, a technology used in GNSS receivers to assess the integrity of the GNSS signals that are being... read more
4/29/2011 5:27:29 PM - Andy Walker
Tags: GNSS Receivers

Using Inertial Sensors to Improve GPS Performance
GPS and inertial sensors complement each other extremely well. GPS works best with a good view of the sky. When the sky view gets obstructed, for example... read more
4/29/2011 5:19:54 PM - John Pottle
Tags: GPS, Inertial Sensors

What is WGS-84?
The World Geodetic System provides a standard co-ordinate frame for the Earth, a standard spheroidal reference surface (or ellipsoid) for raw altitude... read more
4/29/2011 5:16:37 PM - Andy Walker
Tags: GPS

What is a Terrain Obscuration Model?
Particularly relevant for ground-vehicle-based GNSS receivers, terrain obscuration is the phenomenon of temporary and intermittent masking of GNSS signals... read more
4/20/2011 11:35:53 AM - Andy Walker
Tags: GNSS Receivers

Time Discrepancies in Multi-GNSS Receivers
One of the major issues in testing GNSS receivers designed for use with multiple satellite systems is that the different systems do not necessarily share... read more
4/20/2011 11:25:42 AM - Andy Walker
Tags: Multi-GNSS

GPS Modernization and the L2C Signal
L2C is the name given to one of the new signals to be broadcast from the satellites in the modernized GPS constellation. This new signal is intended for... read more
4/15/2011 11:19:21 AM - Andy Walker
Tags: GNSS Simulation, GPS Modernization

Japanese Earthquake Highlights Importance of GNSS Timing
One of the more surprising consequences from the March 2011 earthquake in Japan was that the forces unleashed shifted the earth's mass sufficiently to... read more
4/11/2011 10:14:07 AM - Andy Walker
Tags: GNSS Simulators

GPS Modernization With Improved Civilian Signals
In addition to the new signals to be broadcast under the GPS... read more
4/4/2011 8:06:45 PM - Andy Walker
Tags: GPS Modernization

When Will Galileo be Ready?
The official opening on 20th December 2010 of the Fucino Galileo Control Centre, 130km east of Rome, has brought the Galileo global navigation satellite... read more
4/4/2011 6:49:34 PM - Andy Walker
Tags: Galileo

Motion Simulation with GNSS Scenario Software
For most GNSS receivers, static navigation accuracy is only part of the story. The ubiquitous automotive satnav system is the most common case where... read more
4/4/2011 4:50:58 PM - Andy Walker
Tags: GNSS Testing

Sampling Quantisation for GPS or GNSS RPS Systems
When talking about Record and Playback Systems (RPS), more bits mean more resolution which has got to be better right? Indeed if familiar with the classic... read more
3/21/2011 5:49:06 PM - Steve Hickling
Tags: GNSS Simulation

EGNOS:Fit to FLy
The recent certification of the European Geostationary Navigation Overlay Service (EGNOS) for safety of life applications now means that its performance... read more
3/21/2011 5:25:41 PM - Andy Walker
Tags: GNSS Simulation

What's the deal with using GPS in trains?
There's a simple, compelling, theory around using GPS in trains: by using GPS for position information, coupled with train communication systems, the need... read more
2/17/2011 6:41:33 PM - Andy Walker
Tags: Railway

How do you test an IVNS?
The integrated in-vehicle navigation system (IVNS) is becoming an increasingly popular feature in many automotive applications, ranging from relatively... read more
2/17/2011 6:35:57 PM - Andy Walker
Tags: IVNS

Improving railway navigation
The use of GNSS in navigation, timing and related systems for transportation is ever increasing. The railways are no exception. There are various... read more
2/17/2011 6:24:59 PM - Stuart Smith
Tags: Railway

What is QZSS?
The Quasi-Zenith Satellite System (QZSS) is a GPS augmentation... read more
2/9/2011 10:33:30 AM - Andy Walker
Tags: QZSS, GPS, GNSS

What is a Pseudolite?
A pseudolite (or pseudo-satellite) is any device that performs a specific task that would otherwise require a satellite. So, for example, a dedicated... read more
2/9/2011 10:15:06 AM - Andy Walker
Tags: Pseudolites, GNSS, Single Generator

What is Record & Playback
All Global Navigation Satellite Systems (GNSS) work by measuring the transmission-time delay from a satellite to the receiver. With a clear view of the... read more
2/8/2011 8:39:02 PM - Andy Walker
Tags: GNSS, GSS6400

The Importance of Static Navigation Accuracy in a GNSS Receiver
Of all the performance metrics for a GNSS receiver, navigation accuracy is probably the most important. More to the point, pinpoint static navigation... read more
2/8/2011 8:06:01 PM - Andy Walker
Tags: GNSS, Static Navigation



Need help finding the product that's right for your business?

Contact us