Interferometric orbit determination system for geosynchronous SAR missions: experimental proof of concept

Future Geosynchronous Synthetic Aperture Radar (GEOSAR) missions will provide permanent monitoring of continental areas of the planet with revisit times of less than 24 h. Several GEOSAR missions have been studied in the USA, Europe, and China with different applications, including water cycle monitoring and early warning of disasters. GEOSAR missions require unprecedented orbit determination precision in order to form focused Synthetic Aperture Radar (SAR) images from Geosynchronous Orbit (GEO). A precise orbit determination technique based on interferometry is proposed, including a proof of concept based on an experimental interferometer using three antennas separated 10–15 m. They provide continuous orbit observations of present communication satellites operating at GEO as illuminators of opportunity. The relative phases measured between the receivers are used to estimate the satellite position. The experimental results prove the interferometer is able to track GEOSAR satellites based on the transmitted signals. This communication demonstrates the consistency and feasibility of the technique in order to foster further research with longer interferometric baselines that provide observables delivering higher orbital precision.This work has been supported by the Spanish Science, Research and Innovation Plan (MICINN) with Project Codes TEC2017-85244-C2-2-P and PID2020-117303GB-C21 and by Unidad de Excelencia Maria de Maeztu MDM-2016-0600 financed by the Agencia Estatal de Investigación, Spain.Peer ReviewedPostprint (published version

Orbit determination for hydroterra mission. An interferometric approach

This work has been supported by the Spanish Science, Research and Innovation Plan (MINECO) with Project Codes TIN2014-55413-C2-1-P and TEC2017-85244-C2-2-P and by Unidad de Excelencia Maria de Maeztu MDM-2016-0600 financed by the Agencia Estatal de Investigación, Spain.Peer ReviewedPostprint (author's final draft

Interferometry based orbit observation for geosynchronous synthetic aperture radar (GEOSAR) missions

A major limitation of current Low Earth Orbit Synthetic Aperture Radars (LEOSAR) is related to their revisit time of several days or weeks. They cannot provide continuous monitoring over the same area of the planet. The introduction of the Geosynchronous Synthetic Aperture Radar (GEOSAR) aims to provide permanent illumination over a wide zone of the planet. This work is performed in the context of the new ESA Earth Explorer pre-selected mission G-CLASS/Hydroterra. It is designed to help scientists unravel the details of the daily water cycle. The orbit determination of a GEOSAR is one of the main challenges of the mission. Previous studies show how the generic sub-wavelength tolerance requirement to build a well focused synthetic aperture can be substantially relaxed up to the sub-meter scale. Several orbit observation techniques are reliable and perform well to this end. Among them, interferometry stands out since it can provide orbit observables coming from current satellites operating in GEO, serving as illuminators of opportunity. The experimental orbit observation data resulting from the validation interferometer built at the campus of the Universitat Politècnica de Catalunya in Barcelona is presented. It depicts the expected motion of the ASTRA 1M satellite, serving as proof of concept for future GEOSAR missions such as G-CLASS/Hydroterra.This work has been supported by the SpanishScience, Research and Innovation Plan (MINECO)withProject Codes TIN2014-55413-C2-1-P and TEC2017-85244-C2-2-P and by Unidad de Excelencia Maria deMaeztu MDM-2016-0600 financed by the AgenciaEstatal de Investigación, Spain.Peer ReviewedObjectius de Desenvolupament Sostenible::6 - Aigua Neta i SanejamentObjectius de Desenvolupament Sostenible::3 - Salut i BenestarObjectius de Desenvolupament Sostenible::11 - Ciutats i Comunitats SosteniblesObjectius de Desenvolupament Sostenible::15 - Vida d'Ecosistemes TerrestresObjectius de Desenvolupament Sostenible::13 - Acció per al ClimaObjectius de Desenvolupament Sostenible::9 - Indústria, Innovació i InfraestructuraPostprint (author's final draft

Station-keeping manoeuvre detection for autonomous precise interferometric tracking of geosynchronous gatellites

The advent of geosynchronous remote sensing missions requires the development of precise orbit determination techniques at high orbits. Geosynchronous satellites require station-keeping manoeuvres to be performed periodically. Dynamical models do not consider artificial forces. Therefore, the tracking system must be able to detect them in order to keep track of the spacecraft autonomously. A compact baseline interferometer is deployed in order to track the signals of opportunity from the ASTRA 19.2?E geostationary constellation. The system is capable of autonomously estimate the trajectory of the satellite for a period of 22 days. Even after artificial orbital manoeuvres are performed. These results show that interferometry is a valid alternative for future geosynchronous remote sensing missions which require precise orbit determination. © 2021 IEEEThis work has been supported by the Spanish Science, Research and Innovation Plan (MINECO) with Project Codes TIN2014-55413-C2-1-P and TEC2017-85244-C2-2-P and by Unidad de Excelencia Maria de Maeztu MDM-2016-0600 financed by the Agencia Estatal de Investigacion, Spain.Peer ReviewedPostprint (published version

Adsorbent screening for airborne BTEX analysis and removal

International audienc

Múnich, Ulm, Stuttgart

Guía del viaje realizado por la Escuela de Arquitectura de Toledo a las ciudades de Múnich, Ulm y Stuttgart, en 2016, a través de fotos y planos de los lugares visitados

Assessing kinetics and recruitment of DNA repair factors using high content screens

Repair of genetic damage is coordinated in the context of chromatin, so cells dynamically modulate accessibility at DNA breaks for the recruitment of DNA damage response (DDR) factors. The identification of chromatin factors with roles in DDR has mostly relied on loss-of-function screens while lacking robust high-throughput systems to study DNA repair. In this study, we have developed two high-throughput systems that allow the study of DNA repair kinetics and the recruitment of factors to double-strand breaks in a 384-well plate format. Using a customized gain-of-function open-reading frame library (“ChromORFeome” library), we identify chromatin factors with putative roles in the DDR. Among these, we find the PHF20 factor is excluded from DNA breaks, affecting DNA repair by competing with 53BP1 recruitment. Adaptable for genetic perturbations, small-molecule screens, and large-scale analysis of DNA repair, these resources can aid our understanding and manipulation of DNA repair