PORTABLE GNSS MONITORING STATION (PGMS)

Transcription

1 SPACE PORTABLE GNSS MONITORING STATION (PGMS) Satellite communications, earth observation, navigation and positioning and control stations indracompany.com

2 PORTABLE GNSS MONITORING STATION (PGMS) PORTABLE GNSS MONITORING STATION (PGMS) The objective of the PGMS is to monitor the performance of the GBAS and the others GNSS systems available in an airport area: GPS, RAIM and SBAS. Portable GNSS monitoring station (PGMS) overview The objective of the Portable GNSS Monitoring Station is to monitor the performance of the GNSS systems available in an airport area and the achieved performances: GPS, SBAS and GBAS. In particular, the station is particularly focused to the verification of the service provided by the GBAS Cat-I ground station available in the airport. The station is independent from any of the systems which are monitored and it has been designed to be easily deployed on field and transported either to different locations in the same airfield or to different airfields. The PGMS was developed under AENA contract (DNA 521/0 AENA). The first target of the PGMS is to support the GBAS activities carried out by AENA at Malaga airport. The monitor station receives all-in-view signals from the GPS constellation (L1), the SBAS satellites in the region (EGNOS in the European region) and the signals from the nearby GBAS Cat-I station and computes the navigation solution with the different augmentation systems. Positioning errors, protection levels, integrity and availability are obtained for GPS-alone, GPS-RAIM, SBAS and GBAS solutions. The station calculates and reports in real time the performances achieved by the navigation systems and the accomplishment of the NPA, APV-I, LPV-200 and CAT-I specifications for the applicable modes of navigation. Furthermore, an easy to use graphical interface is provided to generate different PORTABLE GNSS MONITORING STATION (PGMS)

3 type of plots in order to evaluate the results: integrity analysis, error analysis, geometry analysis, Stanford plots, elevation dependent plots, accuracy curves, etc. The station also monitors the quality of the received signals through the correlation function analysis (SQM: Signal Quality Monitoring) and the radiofrequency environment by detecting interferences in the L-band and monitoring the GBAS VHF field intensity. This transportable GNSS Monitor station is able to work autonomously for long periods of time acquiring and processing data. It is also equipped with an operator s interface that can be activated to follow the process in real time. Special emphasis is put on the data storage, retrieval and exportation and on the robustness of the continuous collection. All acquired data, intermediate results, processed data, alarms, alerts, status information, etc. are stored assuring its integrity and can be exported to the appropriate standard formats, like Rinex or Pegasus. Furthermore, a visualisation interface is provided to retrieve and plot the archived data. Modes of operation The operation of the PGMS comprises the following options: Autonomous acquisition: The system is configured for a measurement campaign. Once the configuration has been loaded and the process started, it can work autonomously without operator s intervention. Acquisition and visualisation: Real-time Display: The operators can use the visualisation interfaces to follow the real time collection, processing and system status. Evaluation Display: They can analyse graphically the session since it was started. Recovery and visualisation: To recover the data stored in a previous campaign and analyse it in the Evaluation Display or to export it to different formats (ie. PEGASUS). SPACE

4 L1-L2 ANTENNA PACKAGE L1 Signal L1/L2 ANTENNA PACKAGE VHF ANTENNA PACKAGE Reception & Processing Rack Laptop PC GPS L 1/2 + SBAS Rx GPS SQM Rx Frequency Standard Core Computer Splitters HUB AC/DC Converter L1/L2/SBAS Signal VHS Signal Interference Monitor Rack Laptop PC Spectrum Analysers (2) HUB AC/DC Converter M&C M&C Power Supply 1 Rack UPS Batteries (2) Power Supply 2 Rack UPS Batteries (2) Equipments overview GPS antennas: L1 and L2 choke ring antennas with highly stable phase centre and excellent multipath mitigation. GPS/SBAS receiver: 14 L1/L2 channels and 2 SBAS channels GPS/SQM receiver: 8 L1/L2 channels and 2 SBAS channels with real-time Signal Quality Monitoring (SQM) measurements using multiple correlators, in-band digital pulse blanking on the L2 signal to mitigate pulsed RF interference and multipath effects reduction. VDB antenna: omnidirectional, horizontally polarised foldable VDB antenna particularly designed for mobile applications operating from 108 to 118 MHz VDB receiver: receiver designed for GBAS Cat-I signals reception and decodification. Computers: one Processing Unit for the real-time data collection, processing, evaluation and storage and two Monitoring and Control Units providing capabilities for real time monitoring, historical graphical data analysis, commanding, etc. Spectrum Analysers: two high performance robust spectrum analysers Frequency reference. Rubidium clock ensuring the synchronisation of the station measurement elements. SPACE

5 GPS Constelation SBAS Constelation GBAS Station Acquisition GNSS Performance analysis Interference analysis Results and alerts visualisation Operator Main Functions Electrical Network Data recording and storage Synchronisation Frequency reference Support Functions Monitoring and Control Functions Power Characteristics The design is based on a modular architecture: the equipments of the GNSS Monitor are installed in a set of small portable racks or cases (less than half a meter) that can be deployed in different configurations according to the measurement campaign needs and available space. These modules are: The Reception and Processing rack that contains the different receivers (GPS, SBAS, SQM and GBAS) and the communications and signals distribution units, the processing elements and the main interface with the operators; The Interference module rack that measures spectrum in the L-band and in the VHF working bands and detects interferences on the useful signals; the Antenna sets and the UPS and batteries. The optional power supply racks. The Monitor is able to work autonomously (without operator assistance) for long periods of time (minimum 8 hours with batteries) acquiring and processing GNSS data. Additionally: It is equipped with an operator s interface that can be activated to follow the process in real time. Special emphasis is put on the data storage, retrieval and exportation and on the robustness of the continuous data collection. All acquired data, intermediate results, processed data, alarms, alerts, status information, etc. are stored, assuring its integrity, and can be exported to the appropriate standard formats (ie PEGASUS). A visualization interface is provided to retrieve and plot the archived data. SPACE

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