July-August 2003
1. Monitoring of the development of the on-board 92-cm receiver (R-SRT-92 cm) ongoing at the KB
GORIZONT in Nizhnii Novgorod:
a)
Printed-circuit plates for the flight model were manufactured and
assembled;
2. Monitoring of the development of the on-board 1.35-cm receiver
(R-SRT-1.35 cm) ongoing at the OKB IRE in Fryazino:
a)
Development of the programs and the
methods of the receiver tests were continued, namely:
·
Specifications on the reliability
test;
·
Specifications on the control checks;
·
Plan of the constructive rework;
·
Plan of the integrated tests;
b)
Technical specifications on the
secondary power supply unit were approved; constructive documentation on the
device was created, the mockup was manufactured and tested in the laboratory.
3. SRT test sets were delivered to LA and used for the checkout of the
engineering models in assembled
configuration as “open” complex.
4. Adjusting and testing of Formatter blocks (input quadrature convertor – heterodyne frequency selector
and digital processing and forming blocks) were going in July-August. The
positive results were obtained in digital SSB conversion and filtering.
5. Formatter EGSE was tested in SRT configuration in LA
6. Kalyazin 64-m radio telescope, the main Russian ground telescope for the
RadioAstron project ,was equipped with the new 18-cm dual-polarization feed and
receiver. Initial tests carried out in July 2003 showed that the telescope
efficiency is close to 0.5, and the system temperature is 75 K, with the
uncooled LNA temperature of 35 K.
Tasks and developments completed in
Lavochkin Association
a.
All engineering devices delivered from the
ASC were assembled and successfully checked as “open” complex.
b.
Now all engineering models of scientific
equipment are being assembled in standard flight configurations for the final
check before delivering the assembled configuration to Pushchino.
c.
Thermal tests of special ground receiver cooling system (NSOTR) were
successfully accomplished. NSOTR will be used in Pushchino to cool on-board
receivers..
d.
Report on the accuracy of orbit
measurements and orbit prediction has been issued by the Institute of Applied
Mathematics under contract with LA for RadioAstron high orbit.
ASC Astro Space
Center of Lebedev Physical Instutute
Cold Plate cooled LNAs and
antenna feed
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
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
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)