T HEORY
3 - 3
A
ll
of these so
l
ut
i
ons are generated us
i
ng the method descr
i
bed prev
i
ous
l
y. The
d
i
fferences
i
n the so
l
ut
i
ons are due to the t
i
me span of A ST data used, and the
propagator used. The ST w
ill
use up to the
l
ast 1 0 hours of data ava
il
ab
l
e, w h
il
e
the LT (2b and mb) w
ill
use up to the
l
ast 7 3 hours of data ava
il
ab
l
e.
A ssum
i
ng that track
i
ng
i
s started on a target w
i
th no stored A ST data, the f
i
rst ST
so
l
ut
i
on w
ill
be ava
il
ab
l
e for use approx
i
mate
l
y 9 0 m
i
nutes after track
i
ng beg
i
ns.
The f
i
rst LT 2b so
l
ut
i
on w
ill
be ava
il
ab
l
e 1 8 hours after track
i
ng beg
i
ns. The f
i
rst
LTmb so
l
ut
i
on w
ill
be ava
il
ab
l
e 3 5 hours after track
i
ng beg
i
ns.
The cho
i
ce of w h
i
ch so
l
ut
i
on
i
s used for track
i
ng
i
s made by compar
i
ng, after each
steptrack cyc
l
e, the peak pos
i
t
i
on w
i
th the pred
i
cted pos
i
t
i
ons from a
ll
ava
il
ab
l
e
mode
l
s. The so
l
ut
i
on w h
i
ch produces a pos
i
t
i
on c
l
osest to the steptrack peak
i
s
used.
3.2
O
r
b
i
t S
ca
n
The 7 2 0 0 A C U has a sate
lli
te
l
ocat
i
ng a
l
gor
i
thm referred to as
O
r
b
i
t s
ca
n
. The
purpose of
O
r
b
i
t s
ca
n
i
s to
l
ocate sate
lli
tes
i
n
i
nc
li
ned operat
i
on. Th
i
s method
i
s
super
i
or to other scann
i
ng methods such as Box Scan, Sp
i
ra
l
Scan, or Raster Scan.
Orb
i
t scan w
ill
on
l
y search the most probab
l
e path of the sate
lli
te and not w aste
t
i
me
i
n empty sky.
The
O
r
b
i
t s
ca
n
mode
i
s a user-se
l
ectab
l
e opt
i
on on the
O
P
T
track
i
ng. W hen
correct
l
y set up,
O
r
b
i
t s
ca
n
w
ill
be used w hen no
O
P
T
so
l
ut
i
ons ex
i
st, and no s
i
gna
l
i
s ava
il
ab
l
e at current po
i
nt
i
ng or at box center for the des
i
gnated target.
3.2.1 O
r
b
i
t S
ca
n Th
e
o
r
y
Th
i
s scan method w
ill
on
l
y be effect
i
ve for geosynchronous sate
lli
tes
i
n
i
nc
li
ned
operat
i
on. It
i
s assumed that the sate
lli
te o w ners are attempt
i
ng to ho
l
d nom
i
na
l
l
ong
i
tude and a near c
i
rcu
l
ar orb
i
t.
The 7 2 0 0 A C S creates a set of orb
i
ta
l
parameters to p
l
ace the ascend
i
ng node at
nom
i
na
l
l
ong
i
tude and prov
i
de the est
i
mated
i
nc
li
nat
i
on. The resu
l
t
i
ng tra
j
ectory w
ill
fo
ll
o w the most
li
ke
l
y path for a sate
lli
te
i
n th
i
s type of operat
i
on. From the s
i
te
po
i
nt of v
i
e w , th
i
s produces a f
i
gure 8 (approx
i
mate
l
y) w h
i
ch
i
s fo
ll
o w ed from box
center. The system a
l
w ays starts by trave
li
ng north from box center, a
ll
the w ay
around the f
i
gure 8 and back to box center (refer to F
i
gure 3-1). Th
i
s w
ill
w ork
correct
l
y regard
l
ess of s
i
te to sate
lli
te or
i
entat
i
on. (Note: F
i
gure 3-1 sho w s the scan
i
n terms of
l
at
i
tude/
l
ong
i
tude. The tra
j
ectory w
ill
l
ook d
i
fferent
i
n terms of A Z/EL
based on s
i
te pos
i
t
i
on and sate
lli
te pos
i
t
i
on.)
Содержание VertexRSI 7200
Страница 15: ...INTRODUCTION 1 4 THIS PA GE INTENTIONALLY LEFT BLANK...
Страница 21: ...O VERVIEW 2 6 Figure 2 3 7200 A CU Functional Block Diagram...
Страница 22: ...O VERVIEW 2 7 Figure 2 4 7200 Antenna Control Unit Top View Figure 2 5 7200 Antenna Control Unit Side View...
Страница 41: ...O VERVIEW 2 26 THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 46: ...THEORY 3 5...
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Страница 154: ...7200 M AINTENANCE 7 2 THIS PA GE INTENTIONALLY LEFT BLANK...
Страница 156: ...7200 DRA WINGS 8 2 THIS PAGE INTENTIONALLY LEFT BLANK...
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Страница 164: ...7200 PASSW ORD PROTECTION B 4 THIS PA GE INTENTIONALLY LEFT BLANK...
Страница 202: ...Appendix C 7200 Remote Monitor and Control Protocol CG 6042 Rev F June 2000 C 38 THIS PA GE INTENTIONALLY LEFT BLANK...
Страница 258: ...7200 TROUBLESHOOTING G 12 THIS PA GE INTENTIONALLY LEFT BLANK...
Страница 259: ...VENDOR DA T A H 1 APPENDIX H VENDOR DATA This appendix contains the Sumitomo NTAC 2000 O M manual for the inverters...
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