Monitoring system 1030/1090 SIMON

Surveillance systems based on secondary radars of A/C/S, multilateration, ADS-B and IFF modes 1, 2, 3 share a single communication channel – the 1030 MHz and 1090 MHz frequency. Non-coordinated use of these frequencies may result in reduced performance of respective surveillance systems. To maintain a high standard of air traffic safety, the security of 1030/1090 MHz band is a key condition.


The monitoring system produced by T-CZ has been developed for the purpose of monitoring activities in the 1030/1090 MHz band. Interrogations and replies concerning potential anomalies can be continuously monitored and evaluated, or further saved for the purpose of subsequent off-line analyses.

Main characteristics

  • Monitoring interrogation in the 1030/1090 MHz band and replies from SSR, MLAT, ADS-B, ACAS, and IFF
  • Evaluation of all key interrogation parameters, such as an interrogator code (IC), pulse repetition frequency (PRF), horizontal antenna radiation pattern, etc.
  • Evaluation of a load of a specified on-board responder
  • Provision of warnings in real time based on pre-defined triggers
  • Determination of sources polluting the RF band
  • Provision of analyses of trends and reports with history

System architecture

The 1030/1090 MHz monitoring system consists of the following design units:

  • Antenna sub-system – omni-directional or four 90° sector antennas in the 1030/1090 MHz band, GNSS antenna, signal divider
  • Receiver unit as PCIe card – 1× 1030 MHz and 1× 1090 MHz or 1× 1030/1090 MHz combined for omni-directional antenna
  • Data processing unit – a COTS computer with data processing software


Complies to Commission Implementing Regulation (EU) No 1207/2011 according to Acceptable Means of Compliance and Guidance Material by European Union Aviation Safety Agency (EASA) link:

Documents to download

SIMON 1 booklet SIMON 2 booklet