S-Mode Monopulse Secondary Surveillance Radar

ATM - Air Traffic

The RSMA-S is the latest generation S-MODE Monopulse secondary Surveillance radar developed by INVAP S.E.

It operates in today's modern air traffic scenarios. It is the new version of the RSMA, which since 2007 has been used without radome in the different environments of Argentina: from the cold "end of the world" in Ushuaia, to the humid subtropical climate of Misiones, from the heights of the Puna to the terminal area of Buenos Aires, and in seismic zones of the Cordillera de Los Andes. Our radar complies with ICAO recommendations and achieves the performance required by Eurocontrol for mode S stations.

With state of the art technology, it has interrogation capabilities in modes 1, 2, 3 / A, C, S (ELS and EHS).

It exhibits excellent performance in all modes of operation even in severe FRUIT and GARBLE conditions.

The RSMA-S also has ADS-B functionality to acquire, decode and process Extended Squitter messages emitted by aircraft.
The system is designed to operate even under the most adverse environmental conditions.

Its redundant design allows it to operate continuously, 24 hours a day, 365 days a year with high availability. It is designed to require minimal preventive maintenance, as well as to minimize operating costs throughout its life cycle.

Main features

Developed and built with the latest technology, 100% solid state and fully digital processing.
High availability, low maintenance redundant design.
Two redundant channels integrated into a single standard cabinet.
Monopulse antenna with large vertical aperture.
Geographical alignment, self-calibration and supervision system using a remote monitor (Parrot) or opportunity flights.
Extensive self-diagnosis system, with automatic or manual channel switching.
Modes of operation 1, 2, 3 / A, C, S Elementary Surveillance (ELS) and Enhanced (EHS) with selective interrogations and the ability to re-interrogate in the current sector.
UF4, UF5, UF11 (Uplink)
DF4, DF5, DF11, DF20, DF21 (Downlink)
Comm B
Configurable modes interleaving capacity and interrogation rate per sector.
Configurable sector by sector inhibition capacity.
Receiving and Extracting ADS-B Extended Squitter Messages
FRUIT, multiple garbling, and reflex detection and suppression processor.


Coverage volumeRange 256 NM
Azimuth 360°
Altitude 100.000 feet
Maximum elevation >45°
Modes1, 2, 3/A, C,
Total Target Detection Capability (360°)>1.000 aircrafts
Accuracy<0,02 NM rms
<0,06 rms
Resolution0,05 NM 0,6°
Detection probability> 99,7%
Code validationMode 3/A > 97,1%
Mode C > 96,7%
Operating frequency1030 / 1090 MHz
Interrogation frequency50 A 400 Hz
FRUIT frequency supported (in the 3Db width
of the main antenna lobe)
11.000 / sec.
Scan RateUp to 15 RPM
Environmental conditionsWind speed (Operation): 60 knots
Wind speed (not operative): 100 knots
Operating temperature: -30 ° C / + 60 ° C
Operating humidity: 100%
Earthquake: INTI IMPRESCIRSOC Regulation 103: Zone 4
System availability Measurement (over more than 1,400,000 RSMA operation hours)> 99.997 %
MTBCF Measurement (in more than 1,400,000 RSMA operation hours)> 180.000 h
MTTR30 min


Data output
ASTERIX Cat 1, Cat 2, Cat 21, Cat 34, Cat 48

Configuration and control
Command console and graphical tools for local and remote use.

Product sheet

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