Detail of one of our devices, installed at Córdoba Airport, ArgentinaThe Argentine Monopulse Secondary Radar (RSMA) has been designed and constructed by INVAP for the Argentine Air Force (FAA) and the Civil Aviation Administration (ANAC) to provide safety and efficiency to Air Traffic Control both on route and in approximation.

The RSMA complies with all standards and methods recommended by the International Civil Aviation Organization (ICAO), Annex 10, as well as with all documents published by said Organization related to secondary radars for air traffic control.Thus, it may operate in all five modes of interrogation/answer: modes 1, 2, 3/A, C and in mode S “all call” interlacing up to three modes.

Besides, the software is easily adapted to fully operate in mode S, both in surveillance functions and in data interlaced communications required by this mode of operation, since hardware anticipates operation in S mode.


RSMA main characteristics

The RSMA is a MSSR (Monopulse Secondary Surveillance Radar), which employs monopulses to obtain better azimuthal resolution.  The IF (Intermediate Frequency) analog-digital conversion allows the implementation of a digital monopulse method with better results than traditional methods.

Response detection and STC (Sensitivity Time Control) are implemented digitally.  These characteristics allow a better precision and programming versatility of the STC.

The synchronous and asynchronous interference situation resolution algorithm is applied to solve situations of overlapping of two or more responses.

Auto calibration:
An auto calibration algorithm is used to calibrate on-line azimuthal monopulse, taking occasional flight responses as reference.  If a geographic reference is used (i.e. a PARROT) absolute range and azimuth may also be calibrated.

Two RF target spot generators allow to verify the STC programming and to program flights and particular reflection situations on-line.

Reflector map:
In order to visualize static and dynamic reflectors, a reflector map is automatically kept.  This map is also used to signal reflections on the Operations Console.

BITE (Built-ln Test Equipment) parameters of the RSMA electronics and other processing and environmental parameters are reflected in a Mimic to remotely verify the status of the RSMA.

The PARROT, developed as a separate system, allows to verify the RSMA operation on-line and to geographically calibrate it.

Merged responses:
Responses in A/C and S only all call are merged in a unique target report.  This is the basis to update the radar operation to Elemental S mode (ELS) and Enhanced S mode (EHS).


INKAN (“friend” in mapuche language) prototype, operating at the San Carlos de Bariloche International Airport

RSMA pictures