esa ground antennas and their compatibility with the more experiment n.
Skip this Video
Loading SlideShow in 5 Seconds..
ESA ground antennas and their compatibility with the MORE experiment PowerPoint Presentation
Download Presentation
ESA ground antennas and their compatibility with the MORE experiment

Loading in 2 Seconds...

play fullscreen
1 / 23

ESA ground antennas and their compatibility with the MORE experiment - PowerPoint PPT Presentation

  • Uploaded on

ESA ground antennas and their compatibility with the MORE experiment. R. Maddè, M. Mercolino ESA/ESOC. ESA deep space network. ESA deep space network consists of two stations New Norcia (NNO) DSA-1, operational since 2001, western Australia S- and X- band uplink and downlink capabilities

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'ESA ground antennas and their compatibility with the MORE experiment' - lilac

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
esa ground antennas and their compatibility with the more experiment

ESA ground antennas and their compatibility with the MORE experiment

R. Maddè, M. Mercolino


esa deep space network
ESA deep space network
  • ESA deep space network consists of two stations
    • New Norcia (NNO) DSA-1, operational since 2001, western Australia
      • S- and X- band uplink and downlink capabilities
      • Ka-band downlink optional (not yet taken)
      • Currently supporting Mars Express (MEX) and Rosetta
    • Cebreros (CEB) DSA-2, operational since 2005, Spain.
      • X- band uplink and downlink, Ka- band downlink capabilities
      • Ka-band uplink optional (not yet taken)
      • Currently supporting Venus Express (VEX)
      • Cebreros will be the station supporting BepiColombo
  • Future deep space station
    • DSA-3 mat be located in the southern hemisphere at American longitudes (Chile or Argentina)
      • X- band uplink and downlink (baseline), Ka- band downlink (optional)
detail of the back end rx side only
Ka-band D/C output BW: 220 MHz

X-band D/C output BW: 100 MHz

L-band D/C output BW: 30 MHz

3L-band D/Cs per station

3 IFMS per station (2 for TT&C and 1 for RSI)

Each input BW: 28 MHz

70 MHz

8400 – 8500


31800 – 32300


540-640 MHz







D/C 1










420-640 MHz


D/C 2







Estrack LAN

Detail of the back-end (Rx side only)
back end receiver ifms
IFMS characteristics

Input BW: 28 MHz (High-speed mode)

IF at 70MHz

CFE (common front end) samples at 280 Ms/s

Open loop capabilities

Sampling rate from 1kHz to 4MHz

Quantisation levels: 1,2,4,8,16 bits

Up to 4 channels per each DSP card

Ranging capabilities

Maximum ranging tone frequency at 1.5 MHz (as per ECSS and CCSDS standards)

Back end – Receiver (IFMS)
more requirements generals
MORE requirements (generals)
  • Unlike most scientific experiments mounted on ESA missions, MORE heavily involves both space and ground segment
  • Different requirement “levels” can be defined
  • PI “level 1” performance requirements are the “end-to-end” requirements
  • A set of “level 2” performance requirements has been prepared by the PI, with the intention to apportion them to the space and ground segments
  • Some “level 2” requirements are related to media calibration
more requirements level 2
MORE requirements (level 2)
  • MORE requirements can be split into four main areas:
    • Requirements on the needed multi-frequency link
    • Requirements on Doppler performance (all links)
      • Ka/Ka link: adev (1000 s) < 6*10-15
      • Other links: σX/X/ σKa/Ka=4; σX/Ka/ σKa/Ka=10
    • Requirements on media effects
      • Uncalibrated contribution adev (1000 s) < 1*10-14

(or 3*10-15 ??) (all media) for antenna elevation > 15 deg

    • Requirements on Ranging performance (all links)
      • Ka/Ka ranging calibration error shall be less then than 0.3 ns (1 σ, 1-w) over half a day (X/Ka and X/X: 1.5 ns)
      • Ka/Ka, X/X and X/Ka ranging signals shall be as defined in the SGICD (WBRS – either with tone or PN codes)
      • Question for PI: are “ageing” requirements intended for the Ground Segment as well?
current compatibility of more requirements with dsa
Current compatibility of MORE requirements with DSA
  • Need for a multi-frequency link
    • Imply a station Ka-band uplink upgrade (A in the next chart)
  • Requirements on Doppler performance (all links)
    • Imply the adev characterisation of the station on all links (B)
    • Imply the evaluation of the mechanical noise contribution (B)
  • Requirements on media calibration
    • Imply the use of an ad-hoc calibration system (which does not exist in ESA stations) (C)
  • Requirements on ranging performance
    • Imply the development, deployment and validation of a wide-band ranging processor (D)
    • Imply the development of a proper calibration strategy & the conduction of related test campaign (E)
implementation approach
Implementation approach

List of needed activities:

  • Ka-band transmission implementation
  • Assessment of ADEV performance of the station
  • Media calibration
  • WBRS (Wide band ranging) processor
  • Ranging calibration

Ancillary activities

F. Check station location accuracy

G. Extension of station baseband capabilities

ka band transmission
Ka-band transmission
  • What has been done
    • High stability Ka-band up- and down-conv. are available
    • Ka-band feed, mirrors and dichroic are in production
    • Development of a movable mirror, to squint Ka-Tx beam respect Ka-Rx beam, on going
  • What needs to be done
    • Development of the transmitter HPA
    • Production and procurement of 2 operational units
    • Installation of all Ka-band uplink elements in CEB
    • Test and validation campaign
    • Verification of the Ka-band uplink stability
assessment of adev performances of the station
Assessment of ADEV performances of the station
  • An end-to-end assessment on all the three links is required
  • What has been done
    • At station level, a tool has been developed to compute the ADEV of the station, given the measurements of each of the equipment (X/X link only)
    • ADEV characterisation has been performed in both NNO and CEB (not taking into account the antenna mechanical noise)
    • Development of system able to assess antenna mechanical noise (to be deployed and validated in a test antenna in Villafranca)
  • What needs to be done
    • Evaluate CEB mechanical noise
    • Evaluate overall adev of X/X link, once mechanical noise is known
    • Evaluate overall adev of X/Ka link, once mechanical noise is known
    • Evaluate overall adev of the Ka/Ka link, once the antenna is upgraded
measured adev performances
Measured ADEV performances

Measured Ka-band UC ADEV < 1*10-16

measured adev performances1
Measured ADEV performances

Measured Ka-band DC ADEV of 1*10-16

measured adev performances ceb x x
Measured ADEV performances (CEB X/X)

The MORE X/X adev requirement is 2.4*10-14 @ 1000 s

media calibration
Media calibration
  • The effect of dispersive media will be almost totally cancelled by means of the multifrequency link
  • Requirements on the level at which troposphere effects have to be calibrated have to be frozen
  • The current requirements are not enough to define the needed system
  • There is the need to define the system in terms of
    • Technical performance
    • Station interfaces
    • Interfaces to the final user
  • What has been done
    • Nothing
  • What needs to be done
    • Study and assessment of technical specification of the needed media calibration system
    • Development and procurement of the operational system
    • Installation, testing and long term calibration of the operational system
wbrs processor
WBRS processor
  • Both the proposed MORE ranging systems (with tone at 20MHz or using PN codes) require the development of a new TT&C platform
  • This platform shall anyhow be developed due to obsolescence of the current IFMS (in operation since 2001)
  • What has been done
    • Nothing
  • What needs to be done
    • Study on new wide-band TT&C processor
    • New wide-band TT&C processor development
    • New wide-band TT&C processor procurement
    • Procurement of operational units
    • Installation and test of new TT&C processor in CEB
ranging calibrations
Ranging calibrations
  • Requirements on ranging calibration need some further clarifications
  • ESA has never faced requirements on ranging calibration so stringent. Therefore, ranging calibration achievable accuracies have to be further characterised
  • What has been done
    • Some preliminary test campaigns on the existing links (X/X, X/Ka)
  • What needs to be done
    • Requirement analysis and test with the current available equipment
    • Based on the outputs of the characterisation of the current ranging calibration system, one may consider further activities (if needed – i.e. On-line ranging calibration)
check station location
Check station location
  • The ADEV contribution due to the uncertainty of the station location is required to be less than 1.2*10-15 @ 1000 s. This means a sub-centimetre accuracy (0.9 cm) in the station location.
  • The declared accuracy of ESA deep space antennas is in the order of 1-2 cm over short time periods.
  • Over long time periods, the effect of the tectonics movement must be taken into account.
  • Too little data available to characterise the tectonics movement in CEB.
  • A survey using DDOR/VLBI techniques for evaluating the station coordinates may be considered. This possibility is at the moment TBD.
extension of station baseband capabilities
Extension of station baseband capabilities
  • The advent of a new ranging processor has high impact on baseband station integration
  • The number of receiving/transmitting chains (and related connectivity to the RF equipment) shall be reviewed, depending upon the final mission operational requirements
  • Once this is clear, and the new processor produced, an upgrade of the baseband configuration shall take place
schedule assumptions
Schedule assumptions
  • The main assumption is to have the station ready 6 months before launch
  • Launch is currently scheduled for August 2013
  • It has to be noted that the station is operational, and would require major upgrade (i.e. a considerable down-time)
  •  In order to minimise operational impacts, all integration activities shall be grouped in the same time period
  • This presentation does not talk about costs
  • It just shows how MORE needs can be mapped in the existing ESA infrastructure
  • However, it has to be noted that:
    • All that has been mentioned under “what has been done” has been covered by ESA
    • Most of what has been mentioned under “needs to be done” is currently not financed
  • The PI is invited to acknowledge the above-presented current status
final remarks
Final remarks
  • ESA CEB station would welcome to host the ground segment of the MORE experiments
  • CEB is an operational station, used to support several missions. Therefore:
    • Station configuration is ruled by ESA
    • Station operation is restricted to ESA
    • Interfacing to experiment data has to be done through ESA
  • CEB station will provide in any case routine operations to the BC mission