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• W15945440 abstract "This paper deals with the offline measurement ofinstantaneous frequency transfer distortions and its impactto navigation performance.Distortions on the frequency transfer-characteristics arerelevant for users mainly via reductions of usable signalpower and due to biases which are difficult to be removed.For characterisation of distortion effects for real satellitesand navigation receivers, several evaluation parametersare introduced, which are based on the offline processingof recorded base-band samples. Typical communicationsystem related parameters are considered (like PSD,scatter-plot and eye-diagram) but also parameters whichare derived from the correlation function shape and thusshow directly the distortion-impact on navigationperformance. The latter class of parameters complycorrelation-loss, S-curve-bias, code-code-coherency andthe frequency transfer characteristic itself.Accurate measurements of frequency transfer distortionsrequire careful consideration of measurement distortions.This complies at least measurement noise, samplingconstraints and as most critical the calibration/equalisationof the measurement frequency transfer characteristics. Formeasurements with the satellite in orbit addionally careneeds to be taken on multipath and interference, whereasthe ionospheric dispersion reveals to be more harmless.These topics are discussed and some quantitativeassessment results are given. As coarse conclusion, thereliable characterisation of satellites in orbit requires theuse of high-gain-antennas (>20m diameter).Corresponding measurement setups with BaySEFconnected to the DLR measurement setup using the 30 m -Weilheim antenna of DLR GSOC in Weilheim/Lichtenau,and with the 25-m dish in Chilbolton are shown, whichwere used for example measurements on the GIOVE-Bsatellite.Example offline signal quality assessment results for thevarious parameters and for the different signaltransmissions in L1 from the early GIOVE-B in orbit tests(with BOC(1,1), with CBOC and with TMBOC) arepresented, with the intention to test the evaluationmethods rather than to assess the satellite.The results demonstrate the absolute qualification ofapplied evalation methods and will animate curious peopleto further assessments and analysis. For instance thisconcerns the conclusions, that can be drawn from certainevaluation parameter distortions.Future improvements derived from this activity for signalquality assessment are related to small refinements onevaluation parameters and mainly on the full control overaccurate measurement system characterisation andcalibration" @default.
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• W15945440 date "2008-09-19" @default.
• W15945440 modified "2023-09-27" @default.
• W15945440 title "GNSS Offline Signal Quality Assessment" @default.
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