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RadioAstron Monthly Notices
April 2003
Tasks and developments
completed in the ASC
1. Checkout of EM of
all devices installed in the Focal Container has been done as a preparation to
deliver them to LA.
2. Engineering
models mentioned above were packed and delivered to LA to be assembled with the
SRT.
3. Zero Baseline
Interferometer Tests (ZBIT) were successfully completed with on-board EMs and decoder
for space arm of the interferometer and standard DAS for ground arm of the
interferometer. S2 recording system and software correlator were used to carry
out the tests. The tests were conducted with 6-cm receiver in 2x4 MHz recording
mode with 2-bit sampling.
4. LNAs for 18-cm
and 6-cm receivers have been tested in the laboratory; the receivers will be
installed at Kalyazin 64-m radio telescope.
5. 22-m radio
telescope in Pushchino was tested at 12-GHz for future usage as RadioAstron Tracking
Station antenna.
6. Technical Task
(TZ) for the development of on-board antenna-feeder system of VIRK was agreed
between ASC and LA.
7. Second version of
RadioAstron Mission Operation Handbook has been issued (in Russian).
8. Option of ASC
RadioAstron web-pages was constructed in Russian language; English version has
also been modified: www.asc.rssi.ru/radioastron/index.html
Tasks and developments
completed in Lavochkin Association
1. Special
handscreens (shields) to cover airspaces between STR petals were manufactured
and tested using three petals.
2. Measurements of
SRT surface accuracy were conducted during several successive unfolding and
folding of the petals in order to prove unalterability.
3. Device Container
(DC) equipped with the thermal models of scientific payload was assembled with
the Thermo-Vacuum Model (TVM) of the Spacecraft Bus.
4. Focal Module
equipped with the thermal models of scientific payload is prepared for thermal
tests of special cryogenic system which will be used for LNA cooling during
Pushchino test.
Appendix - the list of
used acronyms
ASC - Astro Space Center
of Lebedev Physical Instutute
LA - Lavochkin
Association
SRT - Space Radio
Telescope (all scientific payload including 10-m dish)
TMS - Spacecraft
Telemetry System (technical)
VIRK - Scientific high
rate (up to 2x72 Mbit/s) radio complex, including transponder
EM - Engineering Model
FM - Focal Module =
Focal Container + Cold Plate
DC - 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
TVT - Termo-Vacuum Tests
Cold Plate - cooled LNAs and antenna feed
Electronic Complex - all SRT electronics
Focal Container - hermetic
package with the scientific payload; it contains receivers, microwave
synthesizer, control unit and is placed in focal site of dish
Service Module, Spacecraft bus - spacecraft itself (without
payload)