Free eBook: Testing Multi-GNSS in an Integration and Validation Environment
Availability of new GNSS systems and the shift to multi-GNSS receivers promises many benefits, from improved coverage and increased accuracy to innovative new services—but it also demands a new approach to receiver testing, integration and validation.
Download a free eBook to discover how multi-channel GNSS simulation not only meets that demand, but delivers much more, helping you:
- Produce quality products faster with repeatable, automated testing
- Simulate the signals of both today’s and tomorrow’s satellite systems
- Carry out verification tests with certified test scenarios
Simply enter a few details opposite to receive your free eBook—and happy reading!
About Spirent
Spirent has been the global leader in GNSS testing for near 30 years. Spirent delivers navigation and positioning test equipment and services to governmental agencies, major manufacturers, integrators, test facilities and space agencies worldwide.
Testing Multi-GNSS in an Integration
and Validation Environment
From GPS to Multi-GNSS
The next generation
The shift from individual satellite navigation systems using GPS
to next-generation receivers capable of exploiting multiple global
navigational satellite systems (Multi-GNSS) offers a host of benenulls
in terms of improved coverage and accuracy and in nenullservicesnull
Page 2SPIRENT eBook
nullonullevernullthis snulltch to Multi-GNSS dictates that manufacturers
tanull a different approach to testing their products to ensure that
they nullll function as desirednullregardless of nullich satellite signals
can be acnullired at any given timenullnulld that nenullapproach has
to run throughout the lifecycle of the product from the research
and development lab right through integration and validation
of the design to the end of the production linenull
Page 3SPIRENT eBook
Quality is king
nullne thing is certainnullthere is no nully any manufacturer can get
anully nullth releasing faulty or poor-performing products to marnulltnull
Todaynulls tech-savvy consumers nullll be nullicnullto spot any failing
productnulland easy access to social media allonull any disgruntled
user to spread the nullrd far and nulldenullnullard-nulln brand
reputations can be destroyed in a matter of nulleenullnull
nullustomer nullevienull
This product is useless, it...
Page 4SPIRENT eBook
nullonullevernullnullth time to marnullt a nully factor in the success of any
high-technology devicenullthe pressure is on to get any nenulldesign
into production as soon as possible and to begin pre-launch
marnulltingnullfocusing on the uninulle features of the nenullenullipmentnull
So before any design of GNSS receiver or location-enabled device
featuring such a subsystem emerges from the laboratory and enters
production it is essential that the design and its functionality are
fully validatednull
Page 5
The validation procedure
nullile it may be the case that validation testing nullll have been
performed at various stages during the designnullthe nullal acceptance
test regime must alnullys be the most arduousnullnullt is essential that
the GNSS receiver be tested for all reasonable operating parametersnull
and under all reasonable operating conditionsnull
Page 6SPIRENT eBook
This nullll mean running the full set of tests typical
for any GNSS receivernull
null nullld-start time to nullst null
null nullarm-start time to nullst null
null nullot-start time to nullst null
null nullcnullisition sensitivity
null Tracnullng sensitivity
null nulleacnullisition time
null Static navigation accuracy
null nullnamic navigation accuracy
null nulldio frenullency interference
null Plus application-specinull tests
for the overall enullipment
nullFor more information on GNSS nulleceiver testingnullplease donullload the eboonullnull Simulation versus nulleal-nullorld Testingnull
Page 7SPIRENT eBook
The multi-GNSS dinullerence
nullearlynullthe Multi-GNSS receiver differs from previous-generation
GPS-only devices in its ability to nullrnullnullth multiple satellite
navigation systemsnullThis might be GPS and GnullnullnullSnullGPS and
GalileonullGPS and nullmpassnullor any combination of the existing
and soon-to-be-expanded servicesnull
Page 8SPIRENT eBook
nullndeednullone of the most appealing aspects of Multi-
GNSS receivers is their truly global applicationnullenabling
manufacturers to produce a single device for use anynullere
in the nullrld and for sale in all marnulltsnull
Page nullSPIRENT eBook
The nullulti-GNSS pronullem
nullonullevernullthis does mean that all the tests typically used for nullalifying
a single-system receiver nullll need to be repeated for each system
used by the receivernullnulld there nullll also be a renullirement to test
the unit in the presence of nullcompositenullsignals made up of partial
navigation signals from tnull or more satellite constellationsnull
This nullcompositenulltesting nullll determine factors such as
· When to use GPS only or Multi-GNSS
· Which order a receiver uses available signals
· Performance implications of choices made
· nullteroperability issues such as system time and reference frames
of different GNSS systems
Page nullSPIRENT eBook
This is made all the more difnullult because the signals from the
various GNSSs have different frenullencies and bandnulldthsnullnulld
nullile the design may feature a good deal of common circuitry
betnulleen the different receiversnullvarious programmable elements
such as clocnull and nullters nullll operate differently in the
presence of different systemsnull
Page null
So many testsnullso little time
nullven assuming that the nullal validation nulluld
only comprise the nine basic tests listed earlier
but repeated for each of the satellite systems
coverednullthe test programme nullll renullire
considerable time and resources to complete
because each test has to be done multiple
times and under different conditions to get a
statistical distribution of resultsnull
Page nullSPIRENT eBook
nulldnullnullst to complicate mattersnullmany of the satellite signals
concerned are not yet fully availablenullFor examplenullnullussianulls GnullnullnullS
system is only nonullapproaching global coveragenullthe nullnulls Galileo
constellation is not yet in positionnulland the nullinese nullmpass system
is still in its local connulluration of nulleidounull
So real-nullrld nullive-snullnulltesting is simply not an option. nulld that can
actually be vienulld as a benenull.
nullxperience in testing GPS receivers
has shonull that manufacturers alnullys
underestimate the time and resources
renullired for real nullrld environment
testingnullSo imagine the problems of
repeating road tests for each of
three or four satellite systemsnull
SPIRENT eBook
Renullirements nullr repeatanulllity
nullndeednullthe need for repeatability is an important criterion that
effectively rules out road testing as a means for validating any
GNSS receiver design nullor a piece of location-anullre enullipment
featuring such a receivernull
Page nullSPIRENT eBook
nullven the simplest test of static location accuracy can never
be precisely repeated using nullive-snullnulltesting nullth real signals
from real satellitesnullFornullnullile the location of the test may
not varynullthe exact positions of the satellites nullthin the GNSS
constellation are continually changingnullSo it is not possible for
exactly the same conditions to be presented tnullcenull
There is honullever a case nullere capturing the richness of the
snull signals to playbacnulllater in the lab
compliments simulation as a source of
GNSS signals for testnull More information
on this can be found by donullloading
the enullonullnull nullverything you need to
nullonullabout nullecord and Playbacnull null
Page nullSPIRENT eBook
The simulation solution
nullemarnullblynullall the tests renullired for validation of a Multi-GNSS
receiver design can be performed in the laboratorynulland the nully to
this setup is a single item of test enullipment nulla multichannel GNSS
simulatornullnullnder softnullre control and nullth a library of ready-nullitten
test scenariosnulltodaynulls multichannel Multi-GNSS simulators can form
the basis of a complete test laboratory for location anullre productsnull
Page nullnullSPIRENT eBook
nullvery test is entirely repeatable using signals nullich are precisely
nullonull and controllednulland complex test senullences can be
programmed to run overnightnullnullth all results available the follonullng
morning for detailed analysisnullnulld the simulator can be integrated
into a multi-part test setup using nullnullor GPnullnullallonullng engineers to
evaluate the performance of a receiver embedded nullthin any piece of
location-anullre enullipmentnull
Page nullSPIRENT eBook
Todaynull tests and tomorronulls tests
nullne huge advantage of the multichannel GNSS simulator is that it can
be used to generate signals from satellite systems that do not yet
existnullSonullnot only nullll a suitable instrument be capable of simulating
todaynulls GPS and GnullnullnullS signalsnullthe same hardnullre nullll be capable
of generating the signals that have been denulled for Galileo and
nullmpass systems nullplus the additional signals that nullll be available
in the next nullve of GPS modernisationnull
Page nullSPIRENT eBook
nulln this nullynullthe GNSS simulator can be vienulled as
in investment in future test capabilities as nullell
as a solution to todaynulls test renullirementsnull
Page nullSPIRENT eBook
The science onullcompliance
The holy grail of producing a single piece of location-anullre enullipment
for sale in multiple global marnulltsnullpotentially using several different
global navigation satellite systems offers manufacturers massive
economies of scale and the ability to expand their global brandsnull
nullonullevernulldifferent marnullts still have different local certinullationsnulland
so the globalisation of a single product could come nullth a number of
certinullation headachesnull
Page 2nullSPIRENT eBook
nullonullevernullby using a globally certinulld multi-channel GNSS simulator
to validate the design and maintaining full test records of the
validation processnullmanufacturers can be shonull to be performing
due diligence in their test proceduresnullnulld this can translate into a
simplinulld compliance procedurenullparticularly in marnullts that allonull
self-certinullation (such as the null nullTTnullnullirective)null
Page 2nullSPIRENT eBook
Tnull Snullrent GNSS and nulli-nulli Solutions
Spirent is the industry leader for GNSS simulator productsnullSpirent
offers several different models of GNSS simulators that support a
variety of different applications and cover the full spectrum of civilian
and military GNSS testing needsnull Spirent products range from basic
single-channel simulatorsnullsuitable for simple production testingnull
through multi-channelnullmulti-constellation simulatorsnullsuitable for
the most demanding research and engineering applicationsnull
Snullrent GSS8nullnull
Multi-GNSS nullnstellation
Simulator
Snullrent GSS67null
Multi-GNSS nullnstellation
system
Snullrent GSS63null
Multi-GNSS Signal
generator
Snullrent GSS64null
nullecord nullPlaybacnull
System
Snullrent GSS57null
nulli-Fi nullccess Point
simulator
Page 22SPIRENT eBook
Why not find out more about Testing Multi-GNSS in an R&D
environment? Download the E-nullonullnull Testing Multi-GNSS in an
R&D Environmentnull
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