The 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. Due to its modes of interrogation, the radar may also complement an air defense system. It may be installed in association with primary 2D or 3D radars in applications of Air Traffic Control in Terminal Areas and Defense or operate as a standalone unit in unattended stations, since it covers all the requirements of remote location . The RSMA requires low maintenance. Its design includes a double channel modular structure, local, remote and signaling controls, and requires a minimum of personnel to perform preventive and corrective maintenance. 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
Monopulse:
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.
STC:
Response detection and STC (Sensitivity Time Control) are implemented digitally. These characteristics allow a better precision and programming versatility of the STC.
Degarbler:
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.
GBP:
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.
Mimic:
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.
PARROT:
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).
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Haces de antena: |
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Suma (sigma) en transmisión y recepción. |
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Diferencia (delta) en recepción. |
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Omnidireccional (omega – SLS) en transmisión y recepción. |
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Velocidad de giro (Control en ruta) 7,5 y 15 RPM. |
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Inclinación (Tilt) –6° a 8° mínimo con indicación. |
