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Galileo Testing using Spirent Galileo Simulator

Galileo Testing using Spirent Galileo Simulator. P. Crosta, L. Marradi, G. Franzoni, D. Fossati, Alcatel Alenia Space Italia. Spirent User Conference, Rome – October 2006. Signal & Noise Test Spirent Galileo. Spectrum Analyzer. thermal noise (RX NF). SIGNAL TO NOISE RATIO TEST

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Galileo Testing using Spirent Galileo Simulator

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  1. Galileo Testing using Spirent Galileo Simulator P. Crosta, L. Marradi, G. Franzoni, D. Fossati, Alcatel Alenia Space Italia Spirent User Conference, Rome – October 2006

  2. Signal & Noise TestSpirent Galileo Spectrum Analyzer thermal noise (RX NF) • SIGNAL TO NOISE RATIO TEST • Verify linearity of C/No measurement and estimate RRX implementation losses • Simulator output power measured with spectrum analyzer • Measurement of the receiver C/No with assumption of thermal noise Rx C/No Measurement Expected CN0 Rx Input Sim. Power

  3. Signal & Noise TestSpirent Galileo • SIGNAL TO NOISE RATIO TEST • Verification of receiver implementation loss taking into account modulation sharing losses (CASM / AltBOC) • Rx Digital Channel Implementation loss calculation: • ~ 2 or 3 dB @ L1c, E6c • ~ 4 dB @ E5a/b • E5a/b: increased loss due to (Central Carrier) SSB-tracking (1.2 dB)

  4. Acquisition Performance Spirent Galileo ACQUISITION STRATEGY: • 3 Stage Serial Acq: • Detection • Verification • Fine Acq (BUMP&JUMP) • 2 Users tested: • Fixed • Rural Vehicle • L1 acq assisted by E6 and E5 • Next Evolution: Fast Acq. Unit with hybrid combination of matched filter and PFS ACQUISITION PERFORMANCE • Verify Rx acq. probability in a doppler bin scan (WARM START) • Verify Rx mean time of acq. in a doppler bin scan

  5. SIDE PEAK FALSE ACQUISITION SIDE PEAK: 2.5% at 33 dB-Hz NO ACQ Acquistion Performance Spirent Galileo • Measure side peak false acq. probability on BOC(1,1) FINEACQUISITION: BUMP&JUMP accumulation increased to 50 Theoretical Probability that the magnitude of a secondary peak is higher than magnitude of main peak

  6. Code-Carrier Accuracy Results Spirent Galileo • PSEUDORANGE AND CARRIER THERMAL NOISE MEASUREMENTS (L1) • Fixed User • Rural vehicle dynamic user: v=140m/s, a=10m/s2 • L1 Test results in line with theoretical formulation (Betz, Spilker) code 1m DLL 2° order Spacing: 0.043 chip Loop Bw: 1 Hz IF Bw: 24 MHz Tint = 16 ms 0.5m 0.1m carrier 5 mm PLL 3° order Loop Bw: 10 Hz IF Bw: 24 MHz Tint = 16 ms 1 mm L1c code and carrier noise performance

  7. Code-Carrier Accuracy Results Spirent Galileo • PSEUDORANGE AND CARRIER THERMAL NOISE MEASUREMENTS (E5) • E5 Test results in line with theoretical formulation (Betz, Spilker) DLL 2° order (Spacing: 0.43 chip) Loop Bw: 1 Hz / IF Bw: 40 MHz PLL 3° order (Bw: 10 Hz) Tint = 17 ms / IF Bw: 40 MHz code code 0.5m 0.5m 0.1m 0.1m carrier carrier 5 mm 5 mm 1 mm 1 mm E5aQ code and carrier noise performance E5bQ code and carrier noise performance

  8. Code-Carrier Accuracy Results Spirent Galileo • PSEUDORANGE AND CARRIER THERMAL NOISE MEASUREMENTS (E6) • E6 Test results in line with theoretical formulation (Betz, Spilker) code 1m DLL 2° order Spacing: 0.215 chip Loop Bw: 1 Hz IF Bw: 24 MHz Tint = 17 ms 0.5m 0.1m carrier PLL 3° order Loop Bw: 10 Hz IF Bw: 24 MHz Tint = 17 ms 5 mm 1 mm E6c code and carrier noise performance

  9. Tracking Loss Thresholds Spirent Galileo Verify tracking threshold lower limits Dopping quickly signal power down to 30dBHz, and from that point, further reducing power slowly (1dB / 30sec) TRACKING THRESHOLDS TEST DATA SET RESULTS: average loss of lock signal to noise ratio of 25 dBHz, lower limit 20 dBHz (all Galileo signals)

  10. Dynamic Limits TestSpirent Galileo Dynamic Limit TEST DATA SET A maximum range rate stress of 760 m/s and a maximum range acceleration of 55 m/s2 have been successfully tested

  11. GIOVE-A: Live Test Live Test GIOVE-A Elevation • Periodic code of 8184 chips • Code epoch of 8 msec • BOC(1,1) modulation Doppler Range First contact in Milan site

  12. Conclusions and Future Work • GARDA Rx proto tested with all Galileo signals • Performance has also been confirmed with the live tracking and acquisition of GIOVE A • Cross check of Spirent Simulator with other systems: • Granada Bit True Simulator Tx signal (VSG, Test Memory) • GMCS (SPENG Simulator) • GPS Simulator • Combined Performance RX + Galileo Simulator are as expected • First Girasole GPS/Galileo Rx integrated box available beginning 2007 will start field testing in rail project GRAIL with GPS/EGNOS signals • GARDA receiver building blocks design are also starting point for other on-going Galileo receiver projects: • GMS Galileo Receiver chain (RF/IF and DSP E5a/E5b design) • IOV Test User Receiver (RF/IF design) • Within the GRC programme AAS-I is following the Spirent Galileo Simulator development which will be used to validate the Receiver

  13. Thank you for your attention For questions: livio.marradi@alcatelaleniaspace.com www.garda-project.it www.girasole-project.it

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