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24
The
web
reference
can
be
found
here:
http://www.srh.noaa.gov/images/epz/wxcalc/stationPressure.pdf
Pressure
and
Velocity
Displacement
Processing
The
RRC3
applies
multiple
filtering
stages
to
the
pressure
data
it
collects
in
order
to
determine
an
equivalent
displacement
velocity.
Pressure
data
oversampling
is
first
performed
by
the
pressure
sensor
using
a
2048
sample
average
to
derive
a
single
pressure
reading.
This
oversampled
pressure
data
is
then
collected
at
a
50
Hz
rate,
then
averaged
again
to
derive
a
20
Hz
sample.
The
20
Hz
pressure
is
then
run
thru
a
recursive
21
element
FIR
filter
kernel
to
produce
the
20
Hz
velocity
data.
To
make
the
altimeter
mach
immune,
additional
velocity
data
discrimination
processing
is
performed
to
ensure
that
anomalous
velocity
changes
are
ignored.
Typically
these
pressure
artifacts
are
most
pronounced
during
velocity
transitions
from
sonic
to
sub
‐
sonic
speeds.
Product
Warranty
Missile
Works
Corporation
has
exercised
reasonable
care
in
the
design
and
manufacture
of
this
product
and
warrants
the
original
purchaser
that
the
RRC3
is
free
of
defects
and
that
it
will
operate
at
a
satisfactory
level
of
performance
for
a
period
of
one
year
from
the
original
date
of
purchase.
If
the
system
fails
to
operate
as
specified,
then
return
the
unit
(or
units)
within
the
warranty
period
for
repair
or
replacement
(at
our
discretion).
The
system
must
be
returned
by
the
original
purchaser,
and
be
free
of
modification
or
any
other
physical
damage
which
renders
the
system
inoperable.
Upon
repair
of
replacement
of
the
unit,
Missile
Works
Corporation
will
return
the
unit
postage
‐
paid
to
the
original
purchaser.
Product
Disclaimer
and
Limit
of
Liability
Because
the
use
and
application
of
this
equipment
are
beyond
our
control,
the
purchaser
or
user
agrees
to
hold
harmless
Missile
Works
Corporation
and
their
agents
from
any
and
all
claims,
demands,
actions,
debts,
liabilities,
judgments,
costs,
and
attorney
fees
arising
out
of,
claimed
on
account
of,
or
in
any
manner
predicated
upon
loss
or
damage
to
property
of,
or
injuries
to
or
the
death
of
any
and
all
persons
arising
out
of
the
use
this
equipment.
Due
to
the
nature
of
electronic
devices,
and
the
application
and
environments
for
those
devices,
the
possibility
of
failure
can
never
be
totally
ruled
out.
It
is
the
responsibility
of
the
purchaser
or
user
of
this
equipment
to
properly
test
and
simulate
the
actual
conditions
under
which
the
device
is
intended
to
be
used
to
ensure
the
highest
degree
of
reliability
and
success.