SDDS enhances safety, security and interoperability by providing the following features:
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Safety
Safety-related features include a high availability hardware platform, alternative data path selection, syntax and range checking, static and dynamic filtering.
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Security
Security-related features begin with a top-level architecture that separates payload and management information, as well as separation between the inter-centre and intra-centre communications.
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Interoperability
Gateway functions allow the simultaneous use of a wide variety of communication protocols. These gateway functions are not restricted to surveillance data. The SDDS can be used in 'transparent mode' for practically any type of information. An automatic switchover function ensures data availability in case of loss of a data source by activating the connection to a substitute.
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ASTERIX data format conversion
ASTERIX data format conversion is an interoperability feature makes it possible for technologies (e.g. ADS-B, Multilateration) to be introduced, without having to update end systems at the same time.
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Filtering
The static filtering capabilities allow data streams to be tailored to user's needs by applying a wide range of filtering options (e.g. geographical filter, primary/secondary, specific SSR code ranges), while dynamic filtering helps prevent uncontrolled loss of data due to overload. The SDDS uses a lean publish/subscribe mechanism to manage the connections to the provided services, thereby facilitating interoperability and reduce configuration effort. This publish/subscribe mechanism also ensures that users can only access data for which they are authorised.
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ADS-B server
SDDS proposes two modes: data driven and periodic modes to process ADS-B reports from multiple sensors.