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首页车载激光多普勒测速仪斑点噪声研究与分析
车载激光多普勒测速仪斑点噪声研究与分析
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"车载自导航激光多普勒测速仪的斑点噪声研究,该研究主要探讨了在车载自导航系统中,激光多普勒测速仪(Laser Doppler Velocimeter,简称LDV)所面临的斑点噪声问题。文章详细介绍了作者设计的一种新型的多点层型激光多普勒测速仪(Multipoint Layer-Type Laser Doppler Velocimeter,MLLDV),用于精确测量车辆的速度,从而支持车载自我导航。 斑点噪声是激光雷达技术中的常见问题,它由激光照射到粗糙表面时形成的干涉图案引起,导致光强度的不均匀分布。这种噪声会直接影响到激光测速仪的精度和稳定性,尤其是在车辆高速移动时,其影响尤为显著。研究中,作者推导出了时间滞后协方差和斑点展宽的公式,这些公式对于理解斑点噪声如何影响多普勒频谱具有重要意义。 通过模拟和实验,研究人员对这些理论进行了深入分析,以揭示斑点噪声如何影响光电流的时间滞后协方差,并分析了这种噪声如何导致测速仪的测量误差。实验结果表明,时间滞后协方差与光电流的斑点展宽有直接关系,这会影响测得速度的精确度,从而影响整个车载导航系统的性能。 为了克服这个问题,研究中可能提出了优化策略或信号处理方法,以减小斑点噪声对测量结果的影响,提升MLLDV的性能。这对于实现更准确、更可靠的车载自导航系统至关重要。此外,该研究也为其他激光雷达应用领域的噪声控制提供了理论依据和技术参考。 这篇研究论文深入探讨了车载自导航激光多普勒测速仪中斑点噪声的问题,通过对理论的推导和实证分析,揭示了噪声对测速精度的直接影响,并可能提出了解决方案,为提高车载导航系统的整体性能提供了重要的科学依据。"
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Optik
125
(2014)
5878–5883
Contents
lists
available
at
ScienceDirect
Optik
jo
ur
nal
homepage:
www.elsevier.de/ijleo
Research
on
speckle
noise
of
laser
Doppler
velocimeter
for
the
vehicle
self-contained
navigation
Jian
Zhou
∗
,
Xiaoming
Nie,
Xingwu
Long
College
of
Optoelectronic
Science
and
Engineering,
National
University
of
Defense
Technology,
Changsha
410073,
China
a
r
t
i
c
l
e
i
n
f
o
Article
history:
Received
22
October
2013
Accepted
31
May
2014
Keywords:
Multipoint
layer-type
laser
Doppler
velocimeter
Speckle
broadening
Vehicle-mounted
self-contained
navigation
system
a
b
s
t
r
a
c
t
A
novel
multipoint
layer-type
laser
Doppler
velocimeter
(MLLDV)
is
designed
to
measure
the
veloc-
ity
of
a
vehicle
for
the
self-contained
navigation
system.
In
order
to
investigate
the
speckle’s
influence
on
the
Doppler
spectrum,
formulas
of
time-lagged
covariance
and
speckle
broadening
were
derived
for
our
MLLDV.
Simulations
and
experiments
are
made
for
detailed
analysis.
The
results
show
that
the
time-lagged
covariance
of
photocurrent
is
directly
proportional
to
the
incident
angle,
and
is
inversely
proportional
to
the
elevation
fluctuation
of
the
ground
together
with
the
velocity
of
the
vehicle.
Speckle
broadening
is
a
function
of
the
vehicle’s
velocity,
the
1/e
2
Gaussian
spot
radius
and
the
phase
correla-
tion
length
of
the
ground.
For
our
MLLDV,
Doppler
frequency
and
Doppler
broadening
are
both
directly
proportional
to
the
velocity
of
the
vehicle.
Besides,
the
ratio
between
Doppler
broadening
and
the
cor-
responding
Doppler
frequency
is
about
0.72%
when
the
speed
of
the
vehicle
varies
from
0
to
9.6
m/s.
©
2014
Elsevier
GmbH.
All
rights
reserved.
1.
Introduction
Since
the
laser
Doppler
velocimeter
(LDV)
was
developed
in
the
mid-1960s
[1],
it
has
a
widespread
ongoing
application
in
many
scientific
fields
for
its
advantages
of
good
linearity,
fast
dynamic
response,
noncontact
measurement
and
high
resolution
[2–4].
A
typical
application
of
LDV
is
to
determine
flow
velocities.
Recently,
using
an
MLLDV
to
offer
parameter
of
the
velocity
for
vehicle-
mounted
self-contained
navigation
system
has
been
reported
[5].
Compared
with
Global
Position
System
(GPS),
LDV
is
autonomous
for
navigation
system.
In
addition,
conventional
speedometers
derive
the
velocity
information
from
the
rotational
speed
of
the
wheels
which
has
the
disadvantage
that
any
slip
between
wheel
and
road
can
not
be
detected;
in
addition,
any
distortion
of
the
wheel
will
affect
the
measurement
accuracy
of
the
speedometer.
But
LDV
shows
excellent
performance
even
under
adverse
environ-
mental
conditions.
So
MLLDV
will
be
an
important
speed
sensor
in
a
self-contained
navigation
system.
In
this
paper,
the
ground
is
chosen
as
a
reference
object
and
it
is
well
known
that
reflection
of
coherent
light
from
a
rough
surface
produces
speckle
pattern
which
is
a
random
interference
pattern
due
to
the
random
nature
of
the
phase
perturbations
at
different
positions
on
the
illuminated
surface.
If
the
surface
is
moving,
the
∗
Corresponding
author.
Tel.:
+86
13739091383;
fax:
+86
073184576314.
E-mail
address:
wttzhoujian@163.com
(J.
Zhou).
speckle
will
also
move
in
the
same
direction
with
a
proportional
velocity.
That
is
to
say,
dynamic
speckle
becomes
a
disturbing
sig-
nal,
which
will
cause
estimated
error
in
velocity
measurement.
By
now
several
studies
have
been
made
to
discuss
the
speckle
characteristics.
R.F.
Strean
et
al.
pointed
out
that
speckle
from
solid
surface
was
an
unnegligible
noise
in
a
scanning
laser
Doppler
vibrometer
[6]
.
Yura
et
al.
analyzed
the
influence
of
partial
coher-
ence
of
the
target
using
ABCD
matrix
[7].
Rough
surface
induced
speckle
effects
on
detection
performance
of
a
pulsed
laser
Doppler
radar
had
been
studied
by
Guanjun
et
al.
[8].
However,
few
attempts
have
been
made
to
investigate
the
speckle
broadening
and
its
influ-
ence
on
LDV
in
term
of
theory
and
experiment.
The
time-lagged
(auto)
covariance
of
the
photocurrent
from
the
detector
is
signifi-
cant
and
useful,
because
the
velocity
information
can
be
extracted
according
to
the
location
of
the
peak
of
power
spectrum.
In
the
paper,
the
expressions
of
the
time-lagged
covariance
and
its
autospectral
density
are
derived
based
on
light
scattering
theory
of
a
random
rough
surface.
In
addition,
according
to
the
autospec-
tral
density
function
of
covariance
of
the
photocurrent,
the
formula
of
speckle
broadening
is
given
to
analyze
its
influence
on
the
mea-
surement
accuracy.
Simulations
and
experiments
are
carried
out
to
verify
the
correctness
of
the
achieved
results.
2.
MLLDV
for
the
vehicle
self-contained
navigation
Now
dual-beam
LDV
has
become
a
choice
for
non-intrusive
measurement
in
various
areas.
However,
for
a
conventional
http://dx.doi.org/10.1016/j.ijleo.2014.07.048
0030-4026/©
2014
Elsevier
GmbH.
All
rights
reserved.
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