Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.asc.rssi.ru/RadioAstron/archives/RAMN/2005/mar.pdf Дата изменения: Thu Nov 3 15:16:52 2011 Дата индексирования: Mon Oct 1 23:51:28 2012 Кодировка: Поисковые слова: ngc 4303

RadioAstron Monthly Notices March 2005 I. Tasks and developments completed in the ASC in the period October 2004 March 2005.
1. Engineering model of the SRT feed system was isolated from the focal container, and it was carefully tested in the laboratory. Mechanical deformations were found in the feed construction, which may be responsible for high values of system temperatures measured in Pushchino radio astronomical tests. Necessary improvements were introduced into the feed construction. New engineering model of the feed system is under development now. Noise temperatures of the engineering models of all receivers were tested in the laboratory. The measured values correspond to the specifications. Technical specifications on the on-board hydrogen frequency standard were formulated and agreed with the Russian firm "Vremya-Ch" (Nizhnii Novgorod) which will be responsible for development of this frequency standard for RadioAstron project. Technical specifications on the on-board 6-cm receiver were formulated and agreed with SKB IRE (the same institution which is responsible for the development of 22 GHz on-board receiver). Flight model of 18-cm receiver has successfully passed operational tests which resulted in formal prolongation of its exploitability term covering launch date in 2007 year. The Amendment to the Technical Specifications (TTZ) on the "Spectr-R" mission is being prepared in LA and in ASC in response to the request from RSA. The Amendment will be issued in April 2005. It will reflect all corrections and innovations for the Mission accumulated during last years. Hard-disk recording system RDR developed in the ASC was successfully tested in observations of OH masers with 64-m radio telescope in Kalyazin. RDR recording systems uses S2 format and provides all RadioAstron recording modes

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=============================================================== Appendix (The list of used acronyms) ASC Cold Plate DC Astro Space Center of Lebedev Physical Instutute cooled LNAs and antenna feed hermetic device container (part of payload); it contains Formatter, Rb oscillators, synthesizer, control unit and is placed under dish DM Device Module = DC + H-maser EGSE Electronic Ground Support Equipment Electronic Complex ­ all SRT electronics EM Engineering Model FC Focal Container ­ hermetic package with the scientific payload; it contains receivers, microwave synthesizer, control unit and is placed in focal site of dish FM Focal Module = Focal Container+Cold Plate LA Lavochkin Association OHCFS-SRT Space Radio Telescope On-board Heterodyne and Clock Frequency Synthesizer set OHFS-SRT Space Radio Telescope On-board Hydrogen Frequency Standard ORFS-SRT Space Radio Telescope On-board Rubidium Frequency Standard RSA Russian Space Agency Service Module, Spacecraft bus ­ spacecraft itself (without payload). SRT Space Radio Telescope (all scientific payload including 10-m dish) TMS Spacecraft Telemetry System (technical) TVT Thermo-Vacuum Tests VIRK Scientific high rate (up to 2x72 Mbit/s) radio complex, including transponder ZBIT Zero Baseline Interferometer Tests (ZBIT)