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Using all data from many sensors would result in an extraordinary redundant coverage in certain upper airspace zones and could result in an extraneous loading of some RADNET trunks. The Track Server uses therefore the concept of effective coverage factor, N, where 2<= N <= 8. The current default is N=5. What this means is that, for a given Radar Configuration(list of wanted operational radars) and a given N, the Track Server automatically calculates a set of geographical filters (one per radar), such that every point in the Track Responsibility Grid is actually covered by the N BEST radars at that location(of course within the physical constraints). Many events changing the radar configuration (temporarily) or the coverage factor applied, result in the recalculation of the complete set of filter tables. Those adaptive filters are automatically submitted and implemented in the relevant RADNET nodes, thus achieving an optimum coverage for the smallest transmission bandwidth.
3.1.3  Input/Output
3.1.3.1  Input:
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ASTERIX Cat 1: Plots and/or monoradar tracks

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ASTERIX Cat 2: Radar service messages

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ASTERIX Cat 8: Weather messages

3.1.3.2  Output:
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ASTERIX Cat 0: Picture synchronisation

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ASTERIX Cat 3: Firm and tentative tracks

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ASTERIX Cat 9: Multi-radar weather images

3.1.3.3  Update Cycle:
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Each firm system track is updated every 4.8 seconds, asynchronous from the participating sensors.

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Tentative tracks are updated synchronous to originating sensor.

3.1.4  Track initiation and cancellation
3.1.4.1  Automatic Multi-radar Track Initiation:
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For all SSR targets

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For all primary targets

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Dynamic Clutter maps

3.1.4.2  Manual Track Initiation.
3.1.4.3  Manual and automatic Track Cancellation
3.1.5  Automatic estimation and correction for Range and Azimuth biases.
3.1.6  Precise co-ordinate transformation, entailing slant-range correction and stereographical projection.
3.1.7  Excellent robustness against residual systematic errors, spurious plots, wrong Mode A and Mode C codes, garbling and resolution phenomena.
3.1.8  Handling of all types of SSR Mode A code changes. Maintenance of same system track over Mode A code changes.
3.1.9  Track fusion, using up to 8 radars at a time to assess track state variables.
3.1.10  Multi-model tracking algorithms and determination Mode-of Flight:
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straight uniform motion

.  
turn filter

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longitudinal acceleration filter

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unknown manoeuvre filter

3.1.11 Tracking for Three Aircraft Performance Classes.
3.1.12 Vertical tracking (Mode C).
3.1.13 Multi-radar weather processing
3.1.14 ASSOCIATION between track data and CURRENT flight plan data.
3.1.15 Overall Co-ordinator between non-coherent ATC/AD centres.
3.1.16 Availability Considerations.
The TS has an excellent availability record, mainly as a result of:
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TS operates on modern hardware (ES9221/211 and RAID5 disks).

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Segregation of hardware across environments.

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Minimum amount of peripheral devices.

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Loose coupling of distributed co-operative processing elements.

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No failures/stops induced by other (non-RDPS) software components.

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Accelerated Restart mechanism: Recovery of Air Situation in 5 to 15 seconds.

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Fault-tolerant configuration of TS-ONL and TS-SBY.

Summarising, the non-exhaustive list of functionality's and characteristics enumerated above yields an Air Situation Picture, with the following key properties:
　
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