PREDICTion: performance theoretical calculation of the ATC surveillance sensors.
[|VERIFication]
Usage
There are two key functions of SASS-C VERIFication:
evaluation of the actual performance of ATC sensors or infrastructure against different standard like Eurocontrol Specification for ATMSurveillance System Performance.
SASS-C VERIFication is divided into many modules. The key ones are:
IRIS: ATC surveillance data recording, decoding and statistics. In supports many framing or coding surveillance data format. One between many: Asterix.
OTR : build a reference trajectory based on the ATC surveillance data generated by the opportunity traffic. This module is widely inspired by the real-time tracker technologies like Kalman filter. But it takes also advantage that it works off-line: the aircraft trajectories are known over the complete dataset time window.
CMP : it is the hearth of VERIFication. The CMP module compares the ATC surveillance data against reference that can be generated by OTR or imported from external source. It generates performance indicators suitable for assessment against standards like ESASSP.
DISPlay: this module displays ATC surveillance data, reconstructed data and performance indicators on different supports like geographical view, scatter diagram, table or mosaic.
History
Since the beginning of development in 1988 based on MURATREC, the SASS-C software has been under constant evolution to cope with supplementary user requirements, to cover surveillance technology upgrades and to follow software technology changes.
In version 6, both suites where included in a common package just named SASS-C. This early version was supporting only PSR/SSR/Mode-S Radars and trackers.
VERIFication v7
Since end of 2003 and in order to prepare SASS-C for the next decade, important software re-engineering has been undertaken in conjunction with functional upgrades, with the aim to introduce up to date technologies in all relevant fields while enhancing system quality. The main functional upgrades relate to the introduction of Aircraft Derived data, and multilateration technology in the Surveillance environment. It consists into four different independent suites:
IRIS is the front element of SASS-C handling Surveillance Data from various sensors. The functionality comprises decoding, recording and computation of statistics.
TRES is the core suite of SASS-C, carrying out the reconstruction of reference trajectories from the input data, and doing the evaluation of Surveillance constituent’s performance.
SMART is an upgrade of the present real-time simulator generating Surveillance data reports by sampling simulated aircraft trajectories.
SCAS comprises RASCAL and CAPT, a new tool to aid in the positioning of ADS-B and TIS-B ground stations by assessing various communication load scenarios.
IRIS and TRES store the surveillance data in a common database.
VERIFication v8
The version 8 is the result of another re-engineering for better performance and maximum openness. The suite has been re-organised as described in Modules sections.
[|PREDICTion]
Taking different resolutions of Digital Terrain Elevation Data – DTED as input, PREDICTion computes the theoretical performance of ATC surveillance sensors like radars and ADS-B or WAM ground stations:
target detection probability
interference between sensors
target position accuracy
The theoretical coverage is generated in two forms that can be used in other tools like SASS-C VERIFication:
screening files: obstacle ranges and elevations per azimuth.
surveillance map: minimum visible altitude per cell in horizontal plane.
