Status of Delta-DOR interoperability San Antonio th , 2017 May 11 Mattia Mercolino E SA/ E SOC
Summary Ka-band Quasar catalogue activities TTCP test/deployment Radiometer deployments Antenna array Radio-science implementation
Ka-band Quasar catalogue activities [1] Activities in MLG PRSR returned from JPL to MLG. Already used in several VLBI passes Also used for Cassini support Receiver still in single freq. (either X or Ka) Revised X-band quasar catalogue just published 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 on-going
Ka-band Quasar catalogue activities [2] Proposed activities in CEB JPL requested the possibility of a temporary installation of the PRSR in CEB to allow frame-tie with Robledo. The PRSR can be temporary installed in CEB (following what was done in 2012) FEC upgrade including star track functionality has been executed If activity to be doe ESA will check if it is possible to have the same network arrangement (direct VPN connectivity) that we have with the PRSR in MLG or what are the alternatives Another PRSR has been installed in NNO (Cassini support)
TTCP test/ deployment TTCP has passed the Factory acceptance and is now being tested at ESOC OL functionality 16 channels (max 32 Msps per channel) Max BW = 160MHz (can actually cover more, if needed) RDEF output E2E of full TTCP planned in the period February-April 2017 This included all TC / TM / coding / Doppler / RNG and DDOR (OL) tests. DDOR E2E test being conducted with TTCP already installed at CEB Plan of initial deployment: Q1/Q2 2017 in CEB and MLG (1TTCP per station in parallel with 2 IFMS). Full transition to TTCP by end 2017 in CEB and MLG. NNO will be updated in 2018 (dates TBC)
Other activities [1] Deployment of Microwave radiometers at ESA DS sites A HATPRO (humidity/temperature profiler) has been deployed in Cebreros in November 2014 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 A second instrument has been procured. Installed in NNO in Jan 2017 It has been used for testing with CEB for DDOR measurements, Results are in processing A third instrument was also procured for MLG site. Installation foreseen in 2017. If testing with CEB-NNO is successful the instruments can be used for improved DDOR performance Prototyping of Tropospheric Delay Calibration System (TDCS) for Radio- Science experiments. Target completion date end 2017
Antenna Arraying Development of off-line correlator for antenna arraying Purpose: develop algorithms and proof-of-concept for (future) on-line correlator Only possible baseline is CEB-MLG (sufficient overlap and collecting area) Will include demodulator and decoder Will be tested on flying mission (EXMO and Mars Express) It will be able to interface with the current receiver for SLE interface Project start date: Jun 2016 Status: CDR passed in March 2017m development on going Expected finish date: Q4 2017
Other activities [3] 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. Installation of retrofitted 100W Ka-SSPA by end 2017. Installation of prototype TDCS by mid-2018. Development of on-line RNG calibration by mid-2018 Support of BepiColombo commissioning (early 2019) for functional testing Support of E2E test during 2019/2020 for performance assessment The full implementation of RSE capability (installation of redundant 500W HPA or equivalent 500W SSPA) and redundant operational TDCS is foreseen in the context of JUICE in the time-frame 2021- 2023
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