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Help Sheet: Repeatability Test Using GSS6400 RPS (Static GPS Signals)

Help Sheet 3The third in a series of Spirent Help Sheets, containing hints and tips for using Spirent’s GSS6400 Record Playback Systems for GPS and/or GLONASS signals.

This Help Sheet explains how you can accurately replay the same static GPS signals in the lab for controlled, accurate testing of GNSS receiver equipment. Enter your details to download it.

PLUS: Check out the other Help Sheets in the series: 

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.

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    This help sheet explains the Repeatability Test using the GSS6400 RPS (static GPS signals) The sheet covers: GSS6400 RPS (static GPS signals) system. ‘How to’ help sheet 3 SP nullnullT HnullP SHnullT S H ow to... This help sheet explains the Repeatability Test using the GSS6400 RPS (static GPS signals) The sheet covers: GSS6400 RPS (static GPS signals) system. Test nullethonull In this test a GPS antenna was used with a snullitternullto snulllt the signal in two directions (see nullure null. This method ensures that the GPS receiver and the GSS6400 receive enullctly the same signal. The nullst direction was to an attached GPS receiver that calculated the nullsitions and nullotted the nullsitions on the screen. The second direction was to a GSS6400 RPS (GPS only) which recorded the data. The antenna had a good view onullthe snullnulland the test lasted null minutes. SP nullnullT HnullP SHnullT S H ow to... nulligure null Page nullSPIRnullT nullelnulltonull nullnull Snullnull null Page nullSPIRnullT nullelnulltonull nullnull Snullnull null SP nullnullT HnullP SHnullT S H ow to... The data stored on the GSS6400 RPS was then nullayed nullcnullinto the same GPS receiver. The results were nullotted in enullctly the same way. nullote that the GPS receiver was comnulletely reset nulltween the two testsnullas in general a GPS system can tanull a long time to onullain a null inullthe GPS time has anulleared to go nullcnullards. nullote also that nullwer was anulllied to the GSS6400 nullr nullminutes nullior to nullrnullrming the nullaynullcnull It can null seen that the nullsitions are accurate to the metre level. In nullct the internally calculated nullsitions have the nullllowing standard deviations. nullccunullcy conullanullenullto nullnulle signals The nullsition nullot nulllow shows the nullsitions outnullt nullr each second over the null minute nullriodnullnullom the nullnull signal. The nullr granull on the right shows the carrier to noise ratio onullthe ten satellites nulling tracnulld at the end onulltest. Page 4SPIRnullT nullelnulltonull nullnull Snullnull null SP nullnullT HnullP SHnullT S H ow to... Repeatability onullplayenullbacnullnullta nullonullthe GSS6400 It can null seen that the two standard deviations are very similar. nullso note that in comnullring the nullo levels nulltween the nullivenull and nullnullayed nullcnullnull signalsnullagain all satellites are within nulldnullat this instant. nulltitude Std deviation (m) nullngitude Std deviation (m) nullve signal 0.6null m 0.nullnullm Played nullcnullsignal 0.440 m 0.null6 m Page nullSPIRnullT nullelnulltonull nullnull Snullnull null SP nullnullT HnullP SHnullT S H ow to... The three screen shots anullve show the Snullnulldata nullayed nullcnullthree times nullom the GSS6400 RPS. nullain the signals are nullsitions are renullatanulle at the sum metre level. The standard deviations nulltween the three tests are given nulllow. nulltitude Std deviation (m) nullngitude Std deviation (m) nullve signal 0.6null m 0.nullnullm Played nullcnullsignal 0.440 m 0.null6 m Played nullcnullsignal (null 0.4null m 0.nullnullm Played nullcnullsignal (null 0.4null4 m 0.nullnullm Spinullent nullnullunications null4 null0nullnull6nullnull glonulllsalesnullnullrent.com www.snullrent.comnullositioning Spinullent nullenullnulll Systenull null null4 6null 6nullnull innullnullnullrentnullderal.com www.snullrentnullderal.com Got a snullnulltphonenull If you have a smartphone download a QR Code reader and then point your phone camera at the QR Code to read the graphic. SP nullnullT HnullP SHnullT S H ow to... nullnull0nullnullIssue null0null nully not shanulle this nullcunullntnull nullnullyou nullunnullthis anullticle onullintenullest www.snullrent.comnullositioning nullisit the Spinullent GnullS blog www.snullrent.comnulllognullositioning.asnull nulleenullnullnulle innullnullnulltionnull gnssnullolutionsnullnullrent.com nullacenullonull nullnnulldIn Twitter Technorati Google nullunull nulligg nullelicious Reddit Stumnulleunulln