{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,6,24]],"date-time":"2024-06-24T00:51:34Z","timestamp":1719190294820},"reference-count":10,"publisher":"World Scientific Pub Co Pte Lt","issue":"10","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J CIRCUIT SYST COMP"],"published-print":{"date-parts":[[2014,12]]},"abstract":" This paper presents a flexible Telemetry, Tracking & Command (TT&C) transponder for Earth Observation (EO) small satellites. The proposed device adds to the state-of-the-art EO TT&C transponders the possibility of scientific data transfer thanks to the high downlink data-rate (up to 40 Mbps) and in-flight reconfigurability via Telecomand (TC). The integration of these features in one single device represents a considerable optimization in terms of mass budget, which is important for EO small satellites. Furthermore, in-flight reconfigurability of communication parameters via TC is important for in-orbit link optimization, which is especially useful for Low-Earth Orbit (LEO) satellites where visibility can be as short as few hundreds of seconds. <\/jats:p> The proposed transponder is a digital radio unit working at 70 MHz intermediate frequency (IF). A new custom and configurable hardware accelerator was developed to cover intensive radio DSP functions at IF. The custom hardware is integrated in a single FPGA with a space-compliant processor core, for control, configuration and interface with the other satellite subsystems. <\/jats:p> All the quantization parameters were fine-tailored to reach a trade-off between hardware complexity and implementation loss (IL). The IF RX\/TX ports require eight bits and seven bits, respectively. The IL is 0.5 dB at BER = 10-5<\/jats:sup> for the RX chain. <\/jats:p> A system proof-of-concept was implemented on the Xilinx Virtex 6 VLX75T-FF484 FPGA. The total device occupation is 82%. The power consumption of the design fitted in FPGA is less than 2 W. The power consumption of the whole demonstrator board is less than 9 W. <\/jats:p>","DOI":"10.1142\/s0218126614501485","type":"journal-article","created":{"date-parts":[[2014,9,18]],"date-time":"2014-09-18T08:02:26Z","timestamp":1411027346000},"page":"1450148","source":"Crossref","is-referenced-by-count":3,"title":["DESIGN, IMPLEMENTATION AND TESTING OF A FLEXIBLE FULLY-DIGITAL TRANSPONDER FOR LOW-EARTH ORBIT SATELLITE COMMUNICATIONS"],"prefix":"10.1142","volume":"23","author":[{"given":"DANIELE","family":"DAVALLE","sequence":"first","affiliation":[{"name":"Department of Information Engineering, University of Pisa, via Caruso 16, Pisa 56122, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"RICCARDO","family":"CASSETTARI","sequence":"additional","affiliation":[{"name":"Department of Information Engineering, University of Pisa, via Caruso 16, Pisa 56122, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"SERGIO","family":"SAPONARA","sequence":"additional","affiliation":[{"name":"Department of Information Engineering, University of Pisa, via Caruso 16, Pisa 56122, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"LUCA","family":"FANUCCI","sequence":"additional","affiliation":[{"name":"Department of Information Engineering, University of Pisa, via Caruso 16, Pisa 56122, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"LUCA","family":"CUCCHI","sequence":"additional","affiliation":[{"name":"Intecs S.P.A., Via Umberto Forti 5, Pisa 56121, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"FRANCO","family":"BIGONGIARI","sequence":"additional","affiliation":[{"name":"Sitael S.P.A., Via Livornese 1019, Pisa 56122, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"WALTER","family":"ERRICO","sequence":"additional","affiliation":[{"name":"Sitael S.P.A., Via Livornese 1019, Pisa 56122, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"219","published-online":{"date-parts":[[2014,10,14]]},"reference":[{"key":"rf2","volume-title":"Satellite Communications Systems: Systems, Techniques and Technology","author":"Maral G.","year":"2011"},{"key":"rf15","doi-asserted-by":"publisher","DOI":"10.1016\/S0893-9659(01)00107-0"},{"key":"rf19","doi-asserted-by":"publisher","DOI":"10.1109\/TASSP.1981.1163535"},{"key":"rf20","doi-asserted-by":"publisher","DOI":"10.1109\/TCOM.1957.1097490"},{"key":"rf21","volume-title":"Understanding GPS: Principles and Applications","author":"Kaplan E. 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