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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.

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"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
 
 
Documentation
Active
Hydrogen Masers
 
 
Passive
Hydrogen Masers
 
 
Documentation
Frequency
comparators
 
 
Output Signal
Generators
and Distributors
 
 
Software