IRNSS/GNSS SIGNAL MONITORING FACILITY

System Block diagram 6.3m diameter antenna

List of Equipments Sr. No.NameApplication 1Digital Storage Oscilloscope (DSO) Signal measurement 2 Real-Time Spectrum Analyzer (RTSA)Signal Analysis 3 IRNSS & GNSS Multi-frequency Receivers IRNSS & other GNSS Data reception and storage 4 Atomic Frequency Source & Precision counter Very Stable Clock and Sync data 5 Data Acquisition & Recording System (DARS) To acquire, digitize and record and playback L1,L2,L5 & S band signals 6 Storage MediaData storage [48 TB] Sr. No.NameApplication1NI Developer suit core edition for windows, with FPGA development option including LABVIEW Simulation and analysis Software

Key Observable parameters at a glance Observation LevelObservablesParameters RF LevelRF SpectrumCentre Frequency, Spectrum shape, Spurious, Spectral Imbalance, In band interference Frequency stability Signal Power, C/N0, RF signalSignal Power, Scintillation Constellation DiagramEVM, MER, Quadrature error Signal/Code Level:Relative Carrier and code Phase Coherency Estimates Eye diagramCode amplitude levels Code Jitter Chip Transit Time Data level:Decoded Navigation data and their limits Navigation Data correctness

Daily monitoring & recording Spectra of the Signals in both L & S Bands Spectra of the Signals in both L & S Bands RF Signal Waveform & Power Level monitoring RF Signal Waveform & Power Level monitoring Any Abnormality in the received Signals of both IRNSS & other GNSS systems Any Abnormality in the received Signals of both IRNSS & other GNSS systems Any Interference between IRNSS & other GNSS signals / bands Any Interference between IRNSS & other GNSS signals / bands Important & routine observations snapshots. A Normal Operation (No threats or abnormal operation or interference detected) Report will be made & stored daily. Important & routine observations snapshots. A Normal Operation (No threats or abnormal operation or interference detected) Report will be made & stored daily. Provision for simulated signal injection along the RF chain Provision for simulated signal injection along the RF chain

User access to the facility A User Guide is made available to the users giving information about the facility and what signal characteristics and parameters can be monitored and recorded by the system. A User Guide is made available to the users giving information about the facility and what signal characteristics and parameters can be monitored and recorded by the system. Remote Access to the recorded data in Mass Storage by Authorized users via FTP is planned Remote Access to the recorded data in Mass Storage by Authorized users via FTP is planned

Stake holders Receiver designers Receiver designers Service providers for verification, validation and improvement Service providers for verification, validation and improvement Universities Universities

Similar GNSS signal monitoring facilities across the world Stanford GNSS Monitoring System Stanford GNSS Monitoring System Rutherford Appleton Laboratory (RAL) of the Chilbolton Observatory (UK) Rutherford Appleton Laboratory (RAL) of the Chilbolton Observatory (UK) German Aerospace Centre (DLR) German Aerospace Centre (DLR) Toluluse, Space Centre (CST) in France, by CNES-ESA Toluluse, Space Centre (CST) in France, by CNES-ESA National Time Service Centre, (NTSC) Chinese Academy of Sciences National Time Service Centre, (NTSC) Chinese Academy of Sciences

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