TITLE:
Time-Frequency System Builds and Timing Strategy Research of VHF Band Antenna Array
AUTHORS:
Junqing Liu, Liang Dong, Min Wang, Shaojie Guo
KEYWORDS:
Antenna Array, GPS, Network Timing
JOURNAL NAME:
Journal of Computer and Communications,
Vol.4 No.3,
March
2,
2016
ABSTRACT:
VHF (Very High Frequency) band antenna
array will receive analog signal from universe for storage after digital sampling
and adding time scale, and then do the interference analysis of different
sub-station digital signal. It requires the time-frequency system with high
precision and low drifting. This paper explains a time-frequency system of VHF
band antenna, which can produce standard 10 MHz signal and clock signal needed
by sampler, to ensure that two computers which sampling data has the same
system time and the storage data has the accurate time scale, the system includes
time comparison programme based on the GPS network timing two different sampling
control computers. Timing strategy uses a time comparison software which based
on the Labview graphical programming platform. This software captures the
system time of two computers to analyze and determine the time deviation when
the two computers occurs time offset, and then grant the GPS time of NTP server
to the two computers through local area network in this time deviation. Final
results show that this method can automatically calibrate the system time of
the computers in the LAN, Precision Can Reach 0.1 s Orless.