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SBAS systems are geosynchronous satellite systems that provide services for improving the accuracy, integrity and availability of basic SBAS signals. Accuracy is enhanced through the transmission of wide-area corrections for SBAS range errors. Integrity is enhanced by the SBAS network quickly detecting satellite signal errors and sending alerts to receivers that they should not track the failed satellite. Signal availability can be improved if the SBAS transmits ranging signals from its satellites. SBAS systems include reference stations, master stations, uplink stations and geosynchronous satellites.
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