Approved For Release 2001/03/26
: CIA-RDP96-00787R0005001 30007-8
variation,
sudden buildup of new activity, diversity of processes and forma-
tions, wavelength dependence of the extent of activity spread, nonuniform
large-scale and small-scale structure, and effect of the sun’s
rotation on loca-
tion and form of observable objects.
In order to cope with solar dynamics,
it
was
foremost necessary to ensure an angle resolution adequate for visible and
x-ray images by appropriate spacing of antenna arrays over a large area.
With
an attainable resolution of 20"x20",
it
is possible to synthesize
35'x35'
radio
images of the solar disk with centimetric waves.
The entire facility includes
an east-west array of 16 antennas,
a north-south and east-west Mills-
Christiansen cross with 64 antennas
in each arm,
a tracking system,
an
automatic channel phasing system,
a receiver complex,
a generator of refer-
ence voltages,
a frequency modulator,
and all this interfaced to an automation
system with peripheral equipment through a communication and data exchange link.
The receiver complex consists of an outlying low-noise microwave amplifier in
a thermostat,
four wideband microwave
filters with different center frequencies
and a common microwave heterodyne oscillator,
a metric-wave attenuator with
program control, a multi frequency detector,
a reference-frequencies base, and
a generator of test noise signal for calibration and inspection.
Preliminary
and pilot measurements made with this
facility have yielded one-dimensional
distributions of solar radioluminance and microwave source intensity, buildup
and distribution of circular polarization,
sudden buildup and transient atten-
uation of microwave
source, intensity, and local polarization
flicker.
Figures
14; references
39:
26 Russian, 13 Western
(3 in Russian translation).
[125-2415]
UDC 522.2:523.164
DECIMETRIC-WAVE APERTURE SYNTHESIS SYSTEM AT SCIENTIFIC-RESEARCH INSTITUTE OF
RADIOPHYSICS
Gorkiy IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY : RADIOFIZIKA in Russian Vol 26,
No 11, Nov 83 pp 1420-1427
BEAGON,
V.
S. DUGIN,
N. A., ROMANYCHEV, A.
A., SEMENOVA,
L.
R.
, TURCHIN,
V.
I.
and TSEYTLIN,
N. M.,
Scientific -Research Institute of Radiophysics
[Abstract]
Development and design of the decimetric-wave aperture synthesis
system at the Scientific-Research Institute of Radiophysics began
in 1970;
its
installation was completed and its operation began in 1979.
Its main element
is
a two-antenna
(D= 7 m)
interferometer with fixed baseline length
(417 m)
for operation at the 56-cm wavelength
in the supersynthesis mode, utilizing the
earth's rotation.
Its other basic components,
developed and produced in var-
ious stages of the project,
are a receiver complex,
a communication link and
phase calibration system, and an automatic measuring and data processing system
with an "Elektronika D3-28" microcomputer.
The receiver complex consists of a
hybrid superheterodyne with phase-lock automatic
frequency control and two
frequency converters,
a single-sideband one and a double-sideband one.
The
first converter consists of high-frequency stages,
is
followed by a balancing
mixer and an intermediate-frequency (60+10 MHz) preamplifier.
The second con-
verter is an ampliphase meter.
The facility also contains equipment for
Approved For Release 2001/03/26
: ClA-RDP96-00787R0005001 30007-8