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Thread: El A4-AR podria tener capacidad BVR??

  1. #1
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    Default El A4-AR podria tener capacidad BVR??

    Hola, pues mi consulta es la siguiente, es posible k el radar apg-66 incorporado en el a4-ar pueda tener capacidad BVR?? y si podria usar otros misiles (aparte del aim-120) como el r-77, Mica, pl-12, Derbys??

    Gracias x responder

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    El AN/APG-66 usado en el Fightinghawk es una versión downgradeada para propósitos de colocarlo en el espacio más limitado del morro del aparato (tiene un planar array más chico, amen de otras modificaciones que ahorita no recuerdo). El radar original está limitado en desplegar misiles SARH como el Sparrow, ya que para desplegar misiles BVR más modernos de guía terminal activa (Derby, AMRAAM) requeriría un Operational Capability Upgrade (OCU) que permita establecer el enlace de datos entre el arma y el radar para propósitos de corrección de curso en vuelo (que desconozco si lo tenga o no pero presumo que quizás sí ya que el radar del A-4AR está basado en el APG-66(v)2 que ya era la versión MLU cuando se introdujo).

    Los A-4AR llegaron con unos 6 simuladores EHUD ACMI (BVR Technologies, Israel) que entiendo yo se puede usar para entrenar a los pilotos en lanzamiento de misiles BVR:



    Así que con la capacidad instalada actual y las herramientas de entrenamiento disponibles, en teoría los Fightinghawk podrían lanzar por lo menos misiles BVR semi-activos y con las modificaciones necesarias, podrían recibir armamento BVR occidental moderno.

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    Primero me gustaria mandarles un saludo a todos ya que este es mi primer mensaje en este foro, al cual he estado visitando con frecuencia pero hasta ahora no habia participado.

    Llendo al tema en cuestion me gustaria dejar en claro que estoy completamente deacuerdo con lo especificado por Fulcrum y aca les dejo algo de info que nos puede ser util sobre la version ARG-1 del APG-66 (V) 2 para el A-4AR.

    The original APG-66(V) multimode fire-control radar was made up of five functional Line-Replaceable Units (LRUs). Each LRU had a self-contained power supply and was designed for maximum autonomy, logical function, and ease of maintenance with minimum interconnection.
    In all current APG-66 radar systems, communication between the radar computer and the other LRUs is via a digital multiplex bus. A dedicated high-speed databus connects the radar computer to the digital signal processor, with the other LRUs communicating via a “party line” bus. Except for the control panel, all radar LRUs are mounted in the nose of the aircraft for easy accessibility from ground level.
    The solid-state transmitter (except for a TWT final output tube) includes a solid-state grid pulser, high-voltage power supplies and regulators, and protection and control circuitry.
    The pilot selects from among four of 16 available radar operating frequencies. The cockpit-mounted radar control panel controls the radar channel mode, range scale, scan width, and elevation bar scan. The F-16’s avionics system can, in many circumstances, control some radar functions.
    The low-power RF module includes a receiver protector, low-noise Field Effect Transistor (FET) amplifier, receiver, analog/digital converters, stable local oscillator, and the system clock generator. This LRU executes all necessary analog processing of the radar return signal and also supplies a frequency agility capability for certain air-to-surface modes. The digital signal processor handles clutter rejection and other radar signal processing.
    The radar computer controls the APG-66(V)’s operating modes, commands the digital signal processor to embed symbols in the video output, carries out calculations, routes information to the fire-control computer, and interacts with other F-16 avionics systems and other radar LRUs while also directing all of the self-test and built-in-test features of the APG-66(V). The computer has 48,000 16-bit words of programmable, semicon-ductor read-only memory. The radar computer uses a serial digital databus (called digibus) to control all radar functions.

    The nose-mounted planar array antenna is gimbaled in two axes. It supplies high-gain and low sidelobes over all scan angles.
    The APG-66(V)2 is an enhanced version of the radar developed as part of the F-16 Mid-Life Upgrade Program and will become the standard APG-66(V). Key improvements are a 25 percent gain in detection and tracking range, a 40 percent improvement in reliability, and an overall 10 to 15 percent improvement in performance. Processing speed has been increased seven times with the addition of 20 times the non-volatile memory. A Doppler correlator reduces the false-alarm rate by classifying returns as either ground movers, weather, mutual interference, or sidelobe returns. The weight of the system is reduced by about 54 pounds (24.5 kg) and the radar is consolidated into three LRUs.
    The update includes:
    • A newly developed signal data processor fully programmable with an IBM PC
    • A higher power and duty cycle transmitter
    • Low-power radio frequency reliability and maintainability improvements for faster data throughput, greater sensitivity, and wider dynamic range
    • Faster antenna phase shifters
    The new design consolidates the functions of the radar computer and digital signal processor, reducing system volume 16 percent and system weight 18 percent, with 14 percent less dissipated power and 19 percent less cooling air needed. At the same time, it increases processing power six times and non-volatile memory seven times. Circuit board count drops from 45 to 14. The signal data processor uses advanced VLSI 32-bit floating point devices and modern programming language. Navigation and targeting lines of sight are generated simultaneously and can be steered independently.
    The processor design includes options for operational mode growth. The enhanced radar was designed for multisensor processing, such as its combination with the Falcon Knight forward-looking infrared (FLIR) sensor.
    Allowances are made for growth into the helmet-mounted sight (HMS) FLIR steering interface.
    Operational Characteristics. In the air-to-air role, the APG-66(V) offers four modes of operation in all-aspect/all-altitude coverage:
    • LOOK UP for search and tracking above the horizon
    • LOOK DOWN for search and tracking below the horizon
    • AIR COMBAT for automatic target acquisition in aerial dogfights
    • AUTOMATIC for automatic selection of look-up or look-down modes
    Either the pilot selects the operating mode or the fire control computer automatically selects the one appropriate to the situation. The pilot can select the automatic mode via a switch on the throttle grip. This action immediately configures the aircraft for a dogfight engagement.
    For close-in combat, the automatic mode is selected, and the radar automatically acquires and tracks the first target it encounters while scanning the head-up display (HUD) field of view. In this mode, the radar provides the AIM-9 missile with pointing information. Provision has been made to provide illumination for the AIM-7 missile if desired.
    In the air-to-surface role, nine modes of operation are available:
    • MAPPING mode provides the pilot with an all-weather map of the ground area in front of the aircraft; ranges are selectable.
    • EXPANDED mode centers an enlarged version (4:1) of the mapping mode on the tracking cursors.
    • DOPPLER BEAM SHARPENING mode enhances the mapping mode for an 8:1 improvement in range and azimuth coverage.
    • SCAN-FREEZE mode displays a frozen ground map and the aircraft’s motion relative to the ground. The F-16’s inertial navigation system provides aircraft movement data, while the radar transmitter can periodically update the map display.
    • AIR-TO-GROUND RANGING mode provides real-time measurement of distance to a designated ground point; this mode enhances weapon delivery.
    • BEACON mode is used for navigation and rendezvous with tanker or other aircraft.
    • SEA-SURFACE SEARCH MODE (SEA 1) uses frequency agility technology for detection of ships in conditions up to sea-state four.
    • SEA-SURFACE SEARCH MODE (SEA 2) provides a similar search in higher sea-states by using a narrow Doppler notch filter. This mode can also provide a moving target indicator capability for certain ground targets such as tanks.
    • FREEZE mode freezes expanded and unexpanded air-to-ground displays at the moment the command is detected by the system, ceasing further RF emissions yet continuing to depict ownership position over the frozen map.
    The APG-66(V)2 mid-life upgrade adds the following mode options:
    • TRACK-WHILE-SCAN (TWS) mode provides high track quality information on up to 10 targets, as well as search information on a radar-controlled volume of +/-60°/+25°.
    • FOUR-TARGET SITUATIONAL AWARENESS mode simultaneously tracks four targets positioned anywhere within the full +/-60° azimuth and elevation volume of the radar, optimized for AMRAAM and high kill probability.
    • SITUATIONAL AWARENESS mode is a multi-track enhanced version of the Track-While-Scan mode combined with SAM to automatically provide optimum illumination of target formations while maintaining track on widely split formations.
    • HIGH ACCURACY TRACK mode improves tracking by employing special techniques to reduce the effects of amplitude scintillation and glint.
    • GROUND MOVING TARGET INDICATION (GMTI) mode utilizes coherent processing to detect small, slow-moving surface targets.
    • MEDIUM DOPPLER BEAM SHARPENING mode provides increased azimuth sharpening and smaller range cells to 80 nautical miles.
    • FIXED TARGET TRACK mode provides the capability to acquire and track either fixed ground targets or moving targets over the ocean or desert.
    • SAM IN GROUND MAP mode allows low- to medium-resolution maps to be interleaved with the situational awareness mode.
    The APG-66(V) was designed for single pilot operation. All combat-critical radar controls are incorporated into the throttle grip and side stick controller. The left console includes all other radar controls. The HUD and the radar display show air-to-air data.
    Fuente: APG-66(V) - Archived 10/2004 - Airborne Electronics Forecast

  4. #4
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    Quote Originally Posted by Molot View Post
    Fuente: APG-66(V) - Archived 10/2004 - Airborne Electronics Forecast
    Ya pero esas son las specs del AN/APG-66, no del ARG-1 que tiene una antena más chica, etc. etc.

    ¿Alguien tiene información específica sobre el ARG-1?

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    Ya pero esas son las specs del AN/APG-66, no del ARG-1 que tiene una antena más chica, etc. etc.

    ¿Alguien tiene información específica sobre el ARG-1?
    Si, me equivoque. Pasa que habia escrito un post y se me borro, la segunda vez que lo escribi redacte mal, quise decir que esa era info sobre el APG-66 en el que se basa el ARG-1, Mil disculpas, me confundi. He estado buscando mas info, pero he encontrado poco, una cosa que encontre sobre el ARG-1 es esto:

    In the end the United States decided on a compromise, selling a downgraded version of the Westinghouse radar, called the ARG-1, that can only lock weapons onto targets that are within sight of the pilot.
    Problema es que viene de una fuente periodistica. (http://www.nytimes.com/1994/02/06/wo...argentina.html)

    En otro foro en el que participo, un forista escribio lo siguiente sobre la plataformas A-4AR:

    El contrato preveia dos partes, en la primera etapa argentina recibiria 36 aviones Skyhawk desactivados, con pocas horas de uso. El objetivo era decuar a argentina a la tecnologia del F-16, mediante un paso intermedio. Y luego recibirian los F-16 MLU.
    Los A-4 recibidos fueron 36 en la versión A-4M y OA-4m ex USMC. Y fueron selecionados por personal de la FAA entre las mejores células disponibles.
    Se recibieron con el Radar APG-66 (V) 2. Este radar, de pulso dopler, fue diseñado para los F-16 y en Argentina modificado al standart ARG-1, puede operar con los mísiles de medio alcance AIM-7 Sparrow y AIM-120 AMRAAM y con el misil de corto alcance AIM-9 Sidewinder. La antena del radar fue cortada para que entre en la nariz del A-4, la cual tuvo que ser modificada para que entrara el radar y los elementos nuevospara armamentos. A pesar de ser más liviano el radar modificado en argentina tiene prestaciones superiores al APG-66 (V) 2 original. El software fue modificado en Argentina.

    En Argentina se le incorporó al avión mando HOTAS, Pantallas Multifuncióncon capacidad nocturna, los sistemas analogos fueron reemplazados por digitales y conectados por fibra optica, se incorporó el sistema SHUD, dos computadoras digitales de misión AN/AYK-14, MADC - ADT el cual esta compuesto por una Computadora de Datos de Aire (MADC) y un Traductor de Datos de Aire (ADT), equipo de navegación digital-GPS LN-100G, Receptor VOR / ILS / GS / MB.
    COmo defenza posee; Receptor RWR, AN/ALR-93 (V)1, Perturbador ECM, AN/ALQ-126B, Dispensador CMDS, AN/ALE-39, Identificador Amigo-Enemigo (IFF), Asiento Eyectable Douglas Escapac 1-G3, generacdor de oxigeno Sistema OBOGS.
    Apenas tenga mas info sobre el tema lo posteo, mientras tanto esto es todo lo que tengo disponible.

    saludos.

  6. #6
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    Basicamente
    el A4 podria tener capacidad BVR
    pero tan larga como la antena pueda ver
    osea que no es tanto cuestion de tamaño de antena, sino mas bien "computing power"
    talvez, no podra ver tan lejos como 120km.
    pero 80km con esa antenita, es todavia posible
    salu2

    el loco.
    ODIO A LOS CHICHEROS!!!

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