Aeroespacial

JUICE. Medium Gain Antenna Subsystem (MGAMA)

Image Gallery
JUICE
JUICE
  • Client: ADS F/ ESA
  • Country: Netherlands
  • Start date: 2016
  • Ending date: 2022
Download datasheet

The Medium Gain Antenna Major Assembly (MGAMA) is a medium-gain dual-axis steerable antenna assembly that provides main uplink and downlink communications between the JUICE spacecraft and Earth.

The MGAMA will be used in the TT&C (Telemetry, Tracking and Command) Subsystem of the satellite. During flybys where the instruments require specific pointing of the spacecraft, the MGAMA is used for communication and radioscience.

The MGAMA will work on the following bands:

  • A 2-way X-Band link
  • A 2-way Ka-Band link

The X & Ka-band Medium Gain Antenna is composed of the following main components:

  • ARA (antenna reflector assembly). The ARA includes the Main Reflector (MREF), the Sub-reflector (SREF) mounted on a thermally stable Tripod Struts Assembly and the structural frame (ARA Frame) which supports all these elements. The ARA frame supports in addition the Feed Assembly.
  • The Boom and RF (radio frequency) waveguides. It joins the ARA with the APM, composed of the waveguide sections connecting the Feeder with the APM elevation Rotary Joint. It also supports the thermal protection. An MLI protects the boom against solar radiation.
  • The Hold Down and Release Mechanisms (HDRMs). They provide attachment points for the MGA in stowed/launching configuration to the S/C structure. The release system is a NEA and a bolt preloaded between two latches. Both latches of each HDRM are preloaded against the boom fittings and at the same time, the fittings of each boom are also preloaded between them due to the preload of the HDRM latch. There are two spherical surfaces in each contact between the latches and fittings and between adjacent fittings.
  • Antenna Pointing Mechanism (APM), which is attached to the S/C structure and consists on a two axis electro-mechanism providing the required 2 degree-of-freedom (azimuth and elevation) and steerable capability to the MGA radiating element, in order to keep the MGA pointing towards Earth under the required S/C operational attitudes for scientific data download.
    The APM provides as well angular position measurement capability in both azimuth and elevation rotational axes. The azimuth axis is driven by the GearHead Motor (GHM) geared to a rotating L bracket which supports the elevation actuator. The output of the elevation output bracket is linked to the MGAMA boom. Both azimuth and elevation GHMs are based on stepper motors with planetary reducers geared to the corresponding output brackets. An integrated X-band dual axis Rotary Joint Assembly (MGA-RJA) routes the RF energy through the APM in both TX and RX directions.
    The APM includes:
    • Antenna Pointing Mechanism Electronics (APME), which provides the control functionality of the APM, receiving the movement commands ordered by the on-board S/C computer. Includes the control algorithms to follow the requested movement profiles, and returns the required telemetry containing MGA health and status information.
    • Harness connecting the APM to the APME.
  • Characteristics:
  • The medium gain antenna will transmit throughout the phase of the mission to the frozen moons of Jupiter, operating both in the environment of Mercury (temperatures above 250°C) and in Jupiter, at 5 AU astronomical units and temperatures of -210°C.
  • The antenna will operate in the X band for the transmission of telemetry data with a gain of 39.80 dBi in uplink and 39.25 dBi in downlink. In the X band it will have a gain of 30.68 dBi in uplink and 28.68 dBi in downlink.
  • The medium gain unit will perform the radio science experiment (RSE) with a phase stability of 4xe-15 (Allan Deviation) in 1000 seconds.
  • The maximum pointing error in 1000 seconds is 95 arc-seconds with a precision of greater than 0.02 degrees. 

Other programs

See all
Rosetta mission

Rosetta spacecraft was a European Space Agency (ESA) scientific mission to conduct a detailed study of [+]

Share
Share:
Contact Up Up
Gestionar cookies
Cookie configurator

A "cookie" is a small file that asks permission to be placed on your devices. Once the user has accepted, the file is added and helps analyze web traffic or allows you to detect when that user visits a particular Website.

Current law allows us to store cookies on your device, if these are strictly necessary for the operation of our web page, based on the legitimate interest of SENER GRUPO DE INGENIERÍA. Thus, for the rest of the cookies we need your consent, so below we inform you of the different types of cookies that we use in our Website.

SENER AEROESPACIAL uses its own and third party cookies to enable the operation of our page, obtain information on browsing and analyse the activity in this Website. You can accept and configure your preferences through this cookie notice, as well as obtain more information in our Cookies Policy.

Cookie settings Accept all and continue browsing
Your choice regarding cookies on this site

This website uses cookies and / or similar technologies that store and retrieve information when you browse. In general, these technologies can serve very diverse purposes, such as, for example, recognizing you as a user, obtaining information about your browsing habits, or customizing the way the content is displayed. The specific uses we make of these technologies are described below.

  • Necessary cookies

    Technical or necessary cookies: those strictly necessary for the correct functionality of SENER GRUPO DE INGENIERÍA’s Website. They cannot be deactivated as, without them, certain parts of the web may not be available.

     

    Necessary cookies

    Technical or necessary cookies: those strictly necessary for the correct functionality of SENER GRUPO DE INGENIERÍA’s Website. They cannot be deactivated as, without them, certain parts of the web may not be available.

    Show / hide full list
    Owner Name Purpose Type Length
    aeroespacial.sener group.sener - HTTP 1 year
    CWNWSESSION - HTTP Session
    prod-plat-senerv3.geanetondemand.com CWNWSESSION - HTTP Session
    prod-plat-senerv3.yunbit.es CWNWSESSION - HTTP Session
  • Statistical cookies

    Analysis and statistical cookies: they help to understand how visitors interact with the Website, by gathering and providing information in an anonymous way, such as visits and views on the Website. In addition, they allow us to identify technical problems and find ways to optimize it.

     

    Statistical cookies

    Analysis and statistical cookies: they help to understand how visitors interact with the Website, by gathering and providing information in an anonymous way, such as visits and views on the Website. In addition, they allow us to identify technical problems and find ways to optimize it.

    Show / hide full list
    Owner Name Purpose Type Length
    aeroespacial.sener _at.hist.# - HTML Persistent
    _ga - HTTP 2 years
    _gat - HTTP 1 day
    _gid - HTTP 1 day
    _pk_id# - HTTP 1 year
    _pk_ses# - HTTPS 1 day
    google-analytics.com collect - Pixel Session
    piwik.yunbit.es piwik.php - Pixel Session
  • Marketing cookies

    Marketing cookies: these are used to personalise SENER GRUPO DE INGENIERÍA’s Website and online store, showing personalised product recommendations or information to the user on this or other web sites.

    Marketing cookies

    Marketing cookies: these are used to personalise SENER GRUPO DE INGENIERÍA’s Website and online store, showing personalised product recommendations or information to the user on this or other web sites.

    Show / hide full list
    Owner Name Purpose Type Length
    aeroespacial.sener __atuvc - HTTP 1 year
    __atuvs - HTTP 1 day
    _at.cww - HTML Persistent
    at-lojson-cache-# - HTML Persistent
    linkedin.com bcookie - HTTP 2 years
    bscookie - HTTP 2 years
    lidc - HTTP 1 day
    lissc - HTTP 1 year
    youtube.com GPS - HTTP 1 day
    VISITOR_INFO1_LIVE - HTTP 179 days
    YSC - HTTP Session
    yt-remote-cast-installed - HTML Session
    yt-remote-connected-devices - HTML Persistent
    yt-remote-fast-check-period - HTML Session
    yt-remote-session-app - HTML Session
    yt-remote-session-name - HTML Session
    doubleclick.net IDE - HTTP 1 year
    test_cookie - HTTP 1 day
    addthis.com uvc - HTTP 1 year
    xtc - HTTP 1 year
Go back Save settings