Status of Delta-DOR interoperability Den Hagg Nov 06 th , 2017 - PowerPoint PPT Presentation

Status of Delta-DOR interoperability Den Hagg Nov 06 th , 2017 Mattia Mercolino E SA/ E SOC

Summary  Ka-band Quasar catalogue activities  TTCP test/deployment  Development of PN DDOR  Test with VLBI antennas on Cassini  Radiometer deployments  Antenna array  Radio-science implementation

Ka-band Quasar catalogue activities [1] PRSR returned from JPL to MLG.  Already used in several VLBI passes (and Cassini)   First issue of Ka-band Quasar catalogue still TBC. If not issued can become an issue for ESA support to use of MLG  First comparisons of VLBI X/Ka RF frame with GAIA optical frame issued with promising results  What about testing the use of TTCP (with RDEF) in X/Ka simultaneously? Request to install (temporarily) a PRSR in CEB for stability  testing of antennas in Robledo. Request is under evaluation Request to keep a PRSR in NNO after Cassini support Request  is under evaluation

TTCP test/ deployment (1)  TTCP installed in 2 out of three ESA DSA (CEB and MLG)  2 TTCP in CEB (equivalent to 4 IFMS)  1 TTCP in MLG (2 nd to come by mid-December)  2 TTCP in NNO to come by June-August 2018 (in any case prior to BepiColombo launch, October 2018)  As of now, parallel installation of 2 TTCP and 2 IFMS for fall-back (after final period of operational utilisation of TTCP IFMS will be removed)  OL functionality  16 channels (max 32 Msps per channel)  Max BW = 160MHz (can actually cover more, if needed)  RDEF output  Integer frequency  Non-integer time-tags

TTCP test/ deployment (2)  E2E and operational tests (1)  This included all TC / TM / coding / Doppler / RNG and DDOR (OL) tests (in static, lab conditions).  DDOR ops test being conducted with TTCPs at CEB and MLG with GAIA  Issues found in the operational tests with GAIA (~1ns a-priori DDOR residual difference between IFMS-based and TTCP-based system) 3.00E ‐ 09 2.50E ‐ 09 2.00E ‐ 09 TTCP resid 1.50E ‐ 09 IFMS resid 1.00E ‐ 09 5.00E ‐ 10 0.00E+00 81500 82000 82500 83000 83500 84000 84500 85000 85500 86000

TTCP test/ deployment (3)  E2E and operational tests (2)  Change of OL version in TTCP in September (with static test in lab)  1 operational pass taken on MEX (around Mars) on DOY298. A-priori DDOR do not show a significant bias between IFMS-based and TTCP- based DDOR. Results under evaluation by OD group 8E ‐ 09 6E ‐ 09 4E ‐ 09 2E ‐ 09 0 IFMS resid 32000 32500 33000 33500 34000 34500 35000 TTCP resid ‐ 2E ‐ 09 ‐ 4E ‐ 09 ‐ 6E ‐ 09 ‐ 8E ‐ 09 ‐ 1E ‐ 08  From November, GAIA DDOR will be taken with TTCP as prime.

Development of PN DDOR  ESTEC is developing a prototype of future on-board Deep Space Transponder Platform under Tech. Research Programme  Prototype will implement the PN DDOR as specified in the study on 1nrad DDOR presented in Fall 2016  Prototype completed CDR  Completion of prototype is expected by Q2-2018  Testing at ESOC is planned in a static (no Doppler) environment with representative DDOR Rx chains (simulating 2 stations) and the prototype correlator for PN DDOR  Test to be executed within Q4-2018

Test with VLBI antennas  Collaboration between ESOC/University of Bologna and INAF  Tracking of Cassini performed in three dates between August and September (prior to Grand Finale)  Use of INAF VLBI antennas of Noto and Medicina (34-m)  Update of translator between Mark-V and RDEF needed (current translator is from MK-VA  RDEF, new format is MK-VB)  Translator being developed in collaboration with University of Bologna

Radiometers deployment (1)  Deployment of Microwave radiometers at ESA DS sites  Few HATPRO (humidity/temperature profiler) have been procured for installation in ESTRACK  Main purpose: to collect attenuation statistics at X/Ka band  Can also be used to provide good estimations of tropospheric wet path delay  under testing (preliminary results good, more longer campaign being planned) for Doppler and DDOR  First instrument deployed in CEB (Nov 2014)  Second instrument deployed in NNO in May 2017.  Third instrument deployed in Malargüe in July 2017  Data collection on-going on all instruments (first results published in EuCAP conference in March 2017)  Prototyping of Tropospheric Delay Calibration System (TDCS) for Radio- Science experiments. Target completion date end 2017

Radiometers deployment (2)  Prototyping of Tropospheric Delay Calibration System (TDCS) for Radio- Science experiments.  Instrument completed  S/W being finalised  E2E test started  End: Dec 2017  Outdoor test  Start: Jan 2018  End: Mar 2018 (TBC)  After outdoor test  Installation in MLG

Antenna Arraying  Development of off-line correlator for antenna arraying  Purpose: develop algorithms and proof-of-concept for (future) on- line correlator  Baseline is CEB-MLG  Supported mod/cod  Demod: SP-L on carrier, NRZ-L on subcar., GMSK (Bt=0.25)  Decod: R-S, convolutional, Turbo (1/2, 1/4. 1/6)  Will be tested on flying mission (EXMO/Mars Express/GAIA)  Will be able to interface with the SLE interface and directly to Mission Control System  Project start date: Jun 2016  Status: TRR completed in March 2017 testing just started  First test planned in Feb/Mar 2018  Expected finish date: Q2 2018

Radio-science capability  Radio-science capability implementation  BepiColombo and JUICE have financed the implementation of radio-science capability. At the moment capability to be develop at MLG only.  Test with KaT and TTCP performed as part of BepiColombo Radio-Science RFCT  Installation of retrofitted 100W Ka-SSPA February 2018.  Installation of prototype TDCS by Q3-2018.