Jump to content, skipping navigation

Free eBook: Testing Multi-GNSS in an R&D Environment

Testing Multi-GNSS in an R&D Environment

Satellite navigation systems that support multiple constellations can provide much better coverage and accuracy than receivers that rely on GPS only. But moving to a multi-GNSS model requires rigorous testing for different constellations and conditions at the R&D stage.

Download a free eBook to discover best-practice approaches to multi-GNSS testing in the R&D lab, including:

  • Basic and advanced tests for accurate multi-GNSS testing
  • The advantages of RF simulation over live-sky testing
  • The benefits of using a multi-channel GNSS simulator

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.

 

FREE eBook: From GPS to Multi-GNSS

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 benefits in terms of improved coverage and accuracy and in new services.

However, this switch to Multi-GNSS dictates that manufacturers take a different approach to testing their products to ensure that they will function as desired, regardless of which satellite signals can be acquired at any given time. And that new approach has to start at the beginning of the product development process – in the research and development lab.

This eBook provides an insight into some of the testing issues faced by GNSS receiver developers and how Multi-GNSS simulation can help designers create receivers that can perform reliably anywhere in the world.

Find out more, download the FREE eBook.

Your Spirent GNSS team

    * Required Field

    Cancel

    Testing Multi-GNSS in an R&D Environment From GPS to Multi-GNSS A host of benefits 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 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 start at the beginning of the product development process nullin the research and development labnull SPIRENT eBook So many systems The problem is that nullile systems such as GLONASSnull Galileonullthe soon to be upgraded GPS and Compass are functionally similarnullthere are manullr differences in the nully they go about their respective tasnullnull nullifferent constellations broadcast on different frenullenciesnullModulation schemes differnullTimebases differnullnullifferent systems even use different mathematical models for ionospheric modellingnull Page 3SPIRENT eBook null a resultnullthe range of tests renullired in the R&D laboratory is considerably nullder than those traditionally used in the development of “vanilla” GPS receiversnull Page 4SPIRENT eBook The simulation solution null Multi-GNSS simulator provides an effective and efnullient means to test GNSS receivers and the systems that rely on themnullnullith a Multi-GNSS simulatornullevery time a test scenario is runnullthe signals produced are identicalnullThe scenario nullll start at the same time and on the same datenulland the satellite positions nullll be identical nulleven donull to the relative phase offsets betnulleen the different signalsnull Page 5SPIRENT eBook nulln this nully you can guarantee that the receiver is being simulated nullth exactly the same signals every time the test is runnullnullnly this nully can you fully determine any improvement (or othernullse) the design alterations have madenull nullatnulls morenulla suitable simulator nullll be capable onullupnullanullnnull to simulate other GNSS signals as soon as they have been denulled by the system operatornull Page 6SPIRENT eBook The tests required nulln the development process of any GNSS receivernullthere are tnull distinct levels of tests that nullll be appliednull Page 7SPIRENT eBook nullasic tests are those that exercise the simplest underlying functionality of the receivernull nulldvanced tests cover those that recreate nullunusualnullsituations and also those that exploit novel applications outside the basic functionality of the receivernull Page 8SPIRENT eBook Basic R&D testinnull nulln testing the underlying functionality of any GNSS receiver design in the laboratorynullit is essential that the enullipment is subnullcted to a nullonull and repeatable stimulus so that the correct response can be assessed and the performance can be adnullsted accordinglynull Page 9SPIRENT eBook nullt the simplest levelnullthe receiver is supplied nullth a reference signal nullth a navigation message consistent nullth the relevant nullnull or interface control documentnullThis allonull the designer to verify the receivernulls algorithms for decoding the messages and recovering time synchronisationnullnullt also allonull the designer to optimise the accuracy and sensitivity of the receivernull nullther basic tests at this level include the receivernulls one pulse per second (nullPS) performancenulltogether nullth static and dynamic accuracy and time to nullst null nullnullnull null Page nullSPIRENT eBook Adnullanced R&D testinnull The nully to any advanced nullnulltesting is the ability to simulate a specinull scenario nullth absolute repeatability so that adnullstments can be made and the test can be re- appliednullThese scenarios can be of almost any naturenulland nullile each one may be unlinullly to occur in real lifenull a reliable Multi-GNSS receiver nullll be expected to perform reliably under all possible conditionsnull Page nullSPIRENT eBook nullearlynullbecause these scenarios are unlinulllynullit is impossible to nullcreatenullthem in real life nullthout a simulator (let alone recreate them for a second test)nullThe simulator enables easy creation of a library of performance tests ready to apply to the receivernull These tests can then be combined and enhanced to create ever more complex test scenarios that can be saved and used over again nullth absolute repeatabilitynull Page nullSPIRENT eBook The nullultinullNSS annulle nullven at the most basic levelnullit is important to test the Multi-GNSS capabilities of the receivernullThe basic tests of signal and truth data references should be repeated for each GNSS nullth nullich the receiver is intended to operatenullSo (currently) this nullll mean applying GPSnullGnullnullnullS and Galileo reference signals and decoding their respective navigation messagesnull Page nullSPIRENT eBook This multiple signal testing nullll also exercise the frenullency agility of the receiver designnullFor nullile both GPS and Galileo broadcast their null civilian signals in a band centred on nullnullnullnullnullnullthe GnullnullnullS civilian signal is broadcast in a band from nullnullMnull to nullnullMnullnull nulld the ability to apply all these tests from the same simulator nullll remove a number of potential error sources from the test setupnull Page nullSPIRENT eBook Adnullanced nullultinullNSS testinnull nullne critical difference in testing a Multi-GNSS receiver compared nullth one destined for use on a single system is in its ability to handle all the various different models used by each satellite systemnull nulld nullile GPSnullGalileo and GnullnullnullS use the same co-ordinate framesnullGPS has its onull timebasenullnullich differs from the other tnull systemsnullnullich are tied to the global nullC time system null Page nullSPIRENT eBook Similarlynullnullile GPS uses the nullobucnullr monulll to correct for errors induced by ionospheric effectsnullGalileo nullll use the Nenulluicnullmodelnull Fortunatelynulla Multi-GNSS simulator can account for these differencesnull and nullll supply the signals exactly as they nulluld appear to the receiver in the real nullrldnullallonullng nullnulltesting to predict real-nullrld performance nully in advance of the nullrealnullsignals being availablenull Page nullSPIRENT eBook nullinulld messanulls So nullile the designer nullll nullnt to assess any nenullreceiver design for its performance against all the standard GNSS testsnull it is essential that these tests are run for each GNSS for nullich the receiver is designednull Page nullSPIRENT eBook null 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 nullut the true Multi-GNSS receiver should be able to produce nullrnullble results even nullen nullrnullng nullth partial signals from multiple systemsnullnullt is only by using a multichannel Multi- GNSS simulator that this performance can be readily assessed and the design renulled to improve itnull Page nullSPIRENT eBook Anulllicationnullnullcific testinnull nullrtain tests at this stage nullll depend on the intended end application of the Multi-GNSS receivernullThese might be automotive- specinull testsnullavionics-specinull tests (nullich might involve the receiver and its antenna being at any range of angles depending on vehicle manoevres) or space-specinull testsnull Page nullSPIRENT eBook nulln each casenullthe simulator nullll either provide suitable ready-nullitten testsnullor can be programmed nullth the relevant scenariosnullnullich can then be replayed nullth absolute repeatabilitynulltime and time againnull Page nullSPIRENT eBook Statenullfnullhenullrt simulation simnullifies R&D The snulltch from simple GPS navigation to the use of multiple satellite systems is bringing a nenull set of challenges to receiver nullsinullers nullnullonullevernull exhaustive testing in the nullnulllaboratory can give designers the connullence that their nenullMulti- GNSS receiver designs nullll perform as intended once they enter servicenull The list of tests renullired is extensivenulland nullive-snullnulltesting using nullrealnullsignals from nullrealnullsatellites is not an optionnull Page nullSPIRENT eBook null multichannel Multi-GNSS simulator nullll allonullall the necessary tests to be run using signals from single and multiple GNSSsnull nulld the ability to nullmix and matchnullsignals from different systems nullll allonulldesigners to create receivers that can perform reliably anynullere in the nullrldnull Page nullSPIRENT eBook Tnull Snullrent GNSS annullnulli-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 Page nullSPIRENT eBook For more comprehensive testingnullSpirent also offers products that simulate additional system elements simultaneously nullth the GNSS constellation signalsnullsuch as inertial sensorsnullvarious automotive sensorsnullnullsisted GPS (nullGPS) nullnullsisted GnullnullnullS (nullGnullnullnullS) datanullSnullS and GnullS augmentation system signalsnullinterference signalsnullGNSS nullecord nullPlaybacnulland nulli-Fi Positioningnull 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 nullSPIRENT eBook We hope you found this Spirent Testing Multi-GNSS in an R&D Environment E-Book of interest. We are continually adding new content to our website on a regular basis. Bookmark this link: www.spirent.com/positioning Visit the Spirent GNSS Blog, there are currently more than 90 posts with nullto nullnew posts added per week. nulltch up on whatnulls new: www.spirent.com/Blog/nullositioning nulleed more informationnull gnss-solutionsnullpirent.com nullharenull nullacebook nullnkednulln nullwitter nullechnorati nulloogle Bunull nulligg nullelicious nulleddit nulltumbleupon nullnull0nullnullnullssue null0null Snullrent nullnullnullnull nullnullnull globalsalesnullpirentnullom nullnullnullpirentnullomnullositioning Snullrent nullenullral Snulltems null nullnullnullnullnullnull infonullpirentfederalnullom nullnullnullpirentfederalnullom Got a smartnullonenull Scan tnull null Conull nullr more innullrmation