Performance Monitoring

of Surveillance Systems

Sensor Evaluation Program (SEP) for ACCS

Automated Sensor Status Report and Performance Monitoring

SEP Performance Monitor optimizes sensor surveillance systems by increasing sensor accuracy and performance. Accuracy has been proven to be increased by 10 - 25%.


The SEP Performance Monitoring system provides vital aid to Air Traffic Management and Air Traffic Equipment Maintenance Managers as it ensure proper and safe operation of the radar network. SEP captures any issues or concerns which occur with any radar(s) in the network - round the clock - so that restorative measures can be made timely.


SEP continuously records radar data which is then used to analyze and monitor radar sensor performance. Conclusive reports are made with an exeptionally high reliability due to years of operation and continuous upgrade and development.


MIP-RADNET Plot Correction Features for ACCS

1.  Optional slant range to ground range correction

In order to utilize multiple radars, it is necessary to compensate for the differences in the distance between slant range (the direct distance from the radar to the target) and ground range (the distance from the radar to the target at ground level). Therefore, MIP-RADNET is able to compensate for the curvature of the earth by using an improved formula superior to the Pythagoras formula.


2.  Radar antenna azimuth non-linearity correction

Variations in the antenna’s angle velocity - or non-linearity in the antenna’s movement as a function of time - causes the antenna to be either ahead or behind it’s ideal angle position. This error is compensated for MIP-RADNET by means of input received from the Radar System Tester (RST)


3.  Radar sweep curve correction

In order to further increase the accuracy of the plot position, MIP-RADNET compensates for the fact that the radar sweep is not a straight line but a curve caused by the antenna’s rotation while the radar pulse is traveling to the target and back again. All can be selectively filtered.


4.  Range Off-set correction

In the event an error in the zero range is observed, the MIP software allows for a range off-set, which enables the Technician to compensate for such error.
5. Range gain adjustment correction

Similarly to point (4) above, a range gain error may occur, which the Technician can compensate for by means of the MIP-RADNET software.


6. Azimuth Off-set correction

In the event an error in the azimuth reference is observed, the MIP-RADNET software allows for an azimuth off-set. This enables the Technician to compensate for such an error. (This feature is used when multiple radars are in operation simultaneously to compensate for individual magnetic variations.)


7.  Multi-scan correlation for optional plot filtering

This tool contained in MIP-RADNET reduces the number of false radar signals (non-targets). False Alarm signal ratio increases proportionately to the number of connected sensors.


1) Specification Verification of New Sensors

After commissioning of new radars, the SEP Performance Monitor may be used to compare the radar's actual performance with the radar's given technical specifications.


2) Performance Accuracy Analysis

The SEP Performance Monitor includes an analysis of the radars ability to detect targets (PD), and to assess the radar accuracy with respect to the target's position in geography and in time.


3) Performance Degeneration Analysis
The SEP Performance Monitor is designed to analyze relevant parameters within radar performance, and not least to recognize incremental performance degeneration over time. This provides valuable information for preempting serious breakdowns. Also, continued monitoring facilitates the fault-finding process when sporadic errors in the sensor surveillance system occur.


In same context it is possible to follow the degeneration of radar performance between regular maintenance sessions, and thereby to examine, quantify, and document the effects - and hopefully benefits - of such maintenance.


Furthermore, comparisons between yesterdays performance of a radar with the past performance of same radar can be made, i.e. comparisons between the average performance during last month, last year, or even with the performance of any other radar, - as long as SEP has recorded data.


4) Archive of Radar Data
The SEP Performance Monitor stores all radar information in an archive in which historical data can be protected for all time.


Furthermore, the same archive can be used off-line for detailed analysis of past events, such as near miss, boarder violation, and accidents.


5) Archive of Air Traffic Behavior
The archive can be used to analyze the evolution in air traffic density and flight patterns.


When unique or simply untraditional patterns of behavior in the air space are discovered, the data in the archive allows for an evaluation of whether a newly observed behavior is in fact new, or whether it has occurred before. For instance, if a specific behavior occurs every summer, in thunder, or in heavy rain, such behavior can be quantified and analyzed for subsequent modification and repair the radar.


6) Archive of Program Enhancements
When the SEP Performance Monitor is enhanced by new functions, the historic data can be implemented as input with a view to testing such new software enhancements, thereby providing a basis for evaluating and correcting new capabilities and functionalities.




 Download SEP Information sheet.