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Active On-Board Hydrogen Maser for Radioastron Space Mission VCH-1010

Application
VCH-1010 is an on-board hydrogen frequency standard designed to provide a highly stable reference signal for the space telescope of the SpaceGround Radio Interferometer during radio astronomy research.

The device generates a stable 1 pulse per second (1 PPS) signal throughout the "RadioAstron" mission.

The output of the device is also used for the excitation of a carrier frequency of 15 GHz for high informational radio channel (VIRK) transmitter, which is also a phase-stable channel for measuring parameters of the On-Board Hydrogen Maser.

Specifications

Output signals nominal values: 1 Hz, 5 MHz, 15 MHz
Relative frequency accuracy 3×10−13 (with periodic adjustments by Astro Space Center of PN Lebedev Physics Institute)

Frequency stability 5 MHz (Allan deviation for
5 MHz signal)
1 s ≤3.0×10−13
10 s ≤3.0×10−14
100 s ≤7.0×10−15
1000 s ≤3.0×10−15
1 hour ≤2.0×10−15
1 day ≤5.0×10−15

at 1 C ambient temperature change in operating temperature range and temperature change rate of no more than 0,3 C/hour

Long term frequency stability <2,0×1014/day
Temperature sensitivity(ambient temperature changes within 1C) <5,0×1015 Power supply sensitivity (changes within 1 V) <2,0×1014
Magnetic field sensitivity(changes within 1 Gs) <2,0×1014
Harmonic distortion in 5 MHz and 15 MHz output signals, less than - 30 dB
Non-Harmonic distortion in 5 MHz and 15 MHz output signals, less than −100 dB for <100kHz carrier offset
SSB phase noise spectral density, no more than

(103) Hz−120 dB/Hz
100 Hz10 %−140 dB/Hz
1 kHz10 %−145 dB/Hz
10 kHz10 %−150 dB/Hz

In terms of resistance special factors the Hydrogen Maser meets the requirements of section 3.3 of the general technical requirements to scientific equipment of the spacecraft "Spektr-R".

Dimensions: ∅460×729 mm.
Weight: 60 kg.

Instruments for Space Applications
 
 
Active Hydrogen Masers
 
 
Passive Hydrogen Masers
 
 
Frequency comparators
 
 
Output Signal Generators and Distributors
 
 
Atomic Clock Ensemble Etalons
 
 
Telecommunication Networks Synchronization Equipment
 
 
"VREMYA-CH" JSC, Russia
Instruments for
Space Applications
 
 
Active
Hydrogen Masers
 
 
Passive
Hydrogen Masers
 
 
Frequency
comparators
 
 
Output Signal Generators
and Distributors
 
 
Atomic Clock
Ensemble Etalons
 
 
Telecommunication Networks
Synchronization Equipment