Advantech INTRAC-305 Manual De Usuario
INTRAC-305
TECHNICAL DESCRIPTION
© 2011 Advantech Wireless
INTRAC-305 MANUAL - Issue 3.2
Page 55
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component of beam shift is not visible to the position
transducers. The mean of the reference shift is tracked by the
INTRAC algorithm in a similar way to a stationkeeping
manoeuvre.
transducers. The mean of the reference shift is tracked by the
INTRAC algorithm in a similar way to a stationkeeping
manoeuvre.
The component of beam shift that is visible to the position
transducers is entirely tracked by INTRAC within a 10 MHz
noise bandwidth. When the position transducers accurately
reflect beam deflection in wind INTRAC continuously tracks
this antenna deflection at 16 sec updates. To support tracking
of visible wind-induced beam deflection between measurement
cycles the INTRAC servo control algorithm maintains a
short-term average of beam pointing. When deciding whether
to update beam pointing INTRAC references this average
rather than the current pointing. A further small deadband is
also applied to suppress unnecessary hunting.
transducers is entirely tracked by INTRAC within a 10 MHz
noise bandwidth. When the position transducers accurately
reflect beam deflection in wind INTRAC continuously tracks
this antenna deflection at 16 sec updates. To support tracking
of visible wind-induced beam deflection between measurement
cycles the INTRAC servo control algorithm maintains a
short-term average of beam pointing. When deciding whether
to update beam pointing INTRAC references this average
rather than the current pointing. A further small deadband is
also applied to suppress unnecessary hunting.
The INTRAC tracking filter distinguishes received beacon
signal power fluctuations, fades and noise from the mean
component of windage-induced beam-pointing, orbit changes
and beam refraction. The effect of the fluctuations, fades and
noise on the INTRAC tracking filter is as if these were a zero
mean position random noise source. The variance of these is
brought within specification by tracking the position estimates
with a narrow noise bandwidth tracking filter. The mean
components of windage-induced beam-pointing, orbit changes
and refraction are seen as transients to be tracked by the
INTRAC relationship algorithm. The design of the relationship
algorithm is a carefully evolved working compromise between
transient performance and noise suppression which provides
high accuracy tracking under all conditions likely to be
encountered in practice.
signal power fluctuations, fades and noise from the mean
component of windage-induced beam-pointing, orbit changes
and beam refraction. The effect of the fluctuations, fades and
noise on the INTRAC tracking filter is as if these were a zero
mean position random noise source. The variance of these is
brought within specification by tracking the position estimates
with a narrow noise bandwidth tracking filter. The mean
components of windage-induced beam-pointing, orbit changes
and refraction are seen as transients to be tracked by the
INTRAC relationship algorithm. The design of the relationship
algorithm is a carefully evolved working compromise between
transient performance and noise suppression which provides
high accuracy tracking under all conditions likely to be
encountered in practice.
THE MODES
The INTRAC-305 has six major operational modes :-
Standby