Applying MDA to SDR for Space to Model Real-time Issues NASA space communications systems have the challenge of designing SDRs with highly-constrained Size, Weight and Power (SWaP) resources. A study is being conducted to assess the effectiveness of applying the MDA Platform-Independent Model (PIM) and one or more Platform-Specific Models (PSM) specifically to address NASA space domain real-time issues. This paper will summarize our experiences with applying MDA to SDR for Space to model real-time issues. Real-time issues to be examined, measured, and analyzed are: meeting waveform timing requirements and efficiently applying Real-time Operating System (RTOS) scheduling algorithms, applying safety control measures, and SWaP verification. Real-time waveform algorithms benchmarked with the worst case environment conditions under the heaviest workload will drive the SDR for Space real-time PSM design.
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Transcript
A
pply
ing
MD
A to
SD
R fo
r Spa
ce to
Mod
el R
eal-t
ime
Issu
es
N
ASA
spac
e co
mm
unic
atio
ns sy
stem
s hav
e th
e ch
alle
nge
of d
esig
ning
SD
Rs w
ith h
ighl
y-co
nstra
ined
Siz
e, W
eigh
t an
d Po
wer
(SW
aP) r
esou
rces
. A
stud
y is
bei
ng c
ondu
cted
to a
sses
s the
eff
ectiv
enes
s of a
pply
ing
the
MD
A
Plat
form
-Ind
epen
dent
Mod
el (P
IM) a
nd o
ne o
r mor
e Pl
atfo
rm-S
peci
fic M
odel
s (PS
M) s
peci
fical
ly to
add
ress
N
ASA
spac
e do
mai
n re
al-ti
me
issu
es.
This
pap
er w
ill su
mm
ariz
e ou
r exp
erie
nces
with
app
lyin
g M
DA
to S
DR
for
Spac
e to
mod
el re
al-ti
me
issu
es.
Rea
l-tim
e is
sues
to b
e ex
amin
ed, m
easu
red,
and
ana
lyze
d ar
e: m
eetin
g w
avef
orm
tim
ing
requ
irem
ents
and
eff
icie
ntly
app
lyin
g R
eal-t
ime
Ope
ratin
g Sy
stem
(RTO
S) sc
hedu
ling
algo
rithm
s, ap
plyi
ng
safe
ty c
ontro
l mea
sure
s, an
d SW
aP v
erifi
catio
n. R
eal-t
ime
wav
efor
m a
lgor
ithm
s ben
chm
arke
d w
ith th
e w
orst
cas
e en
viro
nmen
t con
ditio
ns u
nder
the
heav
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wor
kloa
d w
ill d
rive
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SDR
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oth
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igh
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ies
from
low
(M
Hz)
to (G
Hz)
5
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dmin
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Futu
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wor
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e M
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ands
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lass
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mal
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sion
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ss:
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nsic
com
plex
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ata
rate
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als
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ediu
m M
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on C
lass
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oder
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rge
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ss:
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nctio
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ompl
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ture
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ow, m
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igh
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rate
sig
nals
up
to a
t le
ast o
ne u
ltra-
high
dat
a ra
te tr
ansm
it Si
gnal
7
Nat
iona
l Aer
onau
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and
Spa
ce A
dmin
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App
roac
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ed D
evel
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itial
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se�
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a p
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type
fram
ewor
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initi
ally
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dy re
al-ti
me
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S is
sues
and
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tain
pre
limin
ary
resu
lts�
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rim p
hase
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tegr
ate
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oftw
are
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licat
ion
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gram
min
g In
terfa
ce (A
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toge
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w
ith O
MG
�s P
IM a
nd P
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adio
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rm s
ched
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e W
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sign
s w
ith p
roto
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8
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iona
l Aer
onau
tics
and
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dmin
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al P
hase
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tial P
hase
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haps
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psod
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nim
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psod
y O
bjec
t Exe
cutio
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amew
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erfa
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S�
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�
One
of N
AS
As�
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efer
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Impl
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tatio
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s th
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stru
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roce
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requ
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the
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of P
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ium
and
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9
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tudi
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l-Tim
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avef
orm
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trol
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esou
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ardw
are
Abs
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AL)
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t Man
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ent
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aPV
erifi
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form
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itor a
nd B
ench
mar
k Se
rvic
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ign
Patte
rns
Ana
lyze
d �
Rea
l-Tim
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esig
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atte
rns
[Bru
ce D
ougl
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bjec
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nted
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ign
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tern
s [G
ang-
of-F
our (
GoF
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Map
ping
to S
WR
adio
PIM
/PSM
Mai
n P
rese
ntat
ion
Topi
cs
10
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iona
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onau
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and
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Rea
l-Tim
e W
avef
orm
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trol T
opic
Rad
ioNo
rmal
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ratio
n
STR
SPow
erD
own
rese
t/tim
erR
eset
();
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SIni
tialin
g
STR
SRea
dy
STR
SBus
yst
artC
mdP
roce
ssin
g
STR
SShu
tdow
n
rest
art/
tm(r
esta
rtTi
me)
;
initC
ompl
ete/
tm(in
itTim
e);
cmdP
rocs
sing
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plet
e
tm(Q
OSB
uffe
rTim
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dow
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d
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erO
ff/tm
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me)
;
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lt
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cove
rabl
efaul
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ecte
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ble
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erO
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H
STR
S R
adio
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te C
hart
-Rha
psod
y A
nim
atio
n Pr
epar
atio
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11
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iona
l Aer
onau
tics
and
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ce A
dmin
istr
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n
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�C
oncu
rren
t Wav
efor
m C
ontro
l Req
uire
men
ts�
Exa
mpl
e: S
DR
for S
pace
Con
curr
ent G
PS
Rx
oper
atio
ns
with
ISS
S-b
and
�R
TOS
Spec
ific
Sche
dulin
g Al
gorit
hm�
INTE
GR
ITY
Part
ition
Sch
edul
er�
Par
titio
n S
ched
ulin
g co
ntai
ns it
s ow
n ke
rnel
(man
ages
co
ncur
renc
y )�
How
ever
dis
able
s th
e IN
TEG
RIT
Y R
esou
rce
Man
ager
�C
oncu
rren
tRea
l-Tim
e D
esig
n P
atte
rns
[Bru
ce D
ougl
ass]
�
Mes
sage
Que
uing
, Int
erru
pt, G
uard
ed C
all,
Ren
dezv
ous,
C
yclic
Exe
cutiv
e, R
ound
Rob
in, S
tatic
Prio
rity
(i.e.
Rat
e M
onot
onic
Sch
edul
ing
(RM
S))
, Dyn
amic
Prio
rity
�R
esou
rce
Rea
l-Tim
e D
esig
n P
atte
rns
[Bru
ce D
ougl
ass]
�
Crit
ical
Sec
tion,
Hig
hest
Loc
ker,
Sim
ulta
neou
s Lo
ckin
g,
Ord
ered
Loc
king
, Prio
rity
Inhe
ritan
ce, P
riorit
y C
eilin
g
Stu
died
in In
itial
Pha
se,
Test
Cas
e an
d R
esul
ts
Follo
ws
Stu
died
in In
itial
Pha
se,
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ss D
iagr
amFo
llow
s
Rea
l-Tim
e W
avef
orm
Con
trol a
nd
Res
ourc
e M
anag
emen
t Top
ic
12
Nat
iona
l Aer
onau
tics
and
Spa
ce A
dmin
istr
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INTE
GR
ITY
Par
titio
n Sc
hedu
ler T
estin
g
�S
TRS
may
use
sep
arat
e ad
dres
s sp
aces
to s
atis
fy c
oncu
rrenc
y re
quire
men
ts w
hile
pro
vidi
ng a
relia
ble
and/
or s
ecur
ede
sign
. �
Appl
icab
le to
larg
er m
issi
on c
lass
es a
nd s
ome
med
ium
mis
sion
cla
sses
.
�Th
e IN
TEG
RIT
Y P
artit
ion
Sche
dulin
g lib
rary
can
be
used
to s
ched
ule
task
s on
a p
er-A
ddre
ssS
pace
basi
s.�
Test
Res
ults
usi
ng 3
virt
ual A
ddre
ssS
pace
s, s
ched
uled
as
follo
ws:
�P
1 ru
ns fo
r .1
of e
very
.5 s
econ
ds�
P2
runs
for .
2 of
eve
ry 1
sec
ond
�P
3 ru
ns fo
r .2
of e
very
1 s
econ
d�
The
task
s th
at ru
n pe
riodi
cally
dis
play
(to
the
cons
ole)
indi
catin
g th
e pa
rtitio
n nu
mbe
r and
task
. Ta
sks
in th
e fir
st p
artit
ion
run
follo
wed
by
the
2nd
parti
tion
(for t
wic
e as
long
), fo
llow
ed b
y th
e fir
st p
artit
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agai
n, e
tc.
�Ta
sks
run
in s
epar
ate
parti
tions
ena
blin
g a
mor
e re
liabl
e an
d/or
secu
re
desi
gn b
ut re
quire
s m
ore
mem
ory
due
to a
dditi
onal
virt
ual a
ddre
ss s
pace
ov
erhe
ad
�N
ote:
IN
TEG
RIT
Y w
orki
ng o
n a
high
-res
olut
ion
parti
tion
sche
dule
r whi
ch
may
dee
m h
elpf
ul fo
r sch
edul
ing
STR
S h
igh
(Gbp
s) W
avef
orm
s.
Rea
l-Tim
e W
avef
orm
Con
trol a
nd
Res
ourc
e M
anag
emen
t Top
ic
13
Nat
iona
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Spa
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RTO
S Sc
hedu
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nel
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dule
r
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iveO
bjec
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ourc
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apho
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esou
rce
11
Task
Sem
apho
rePr
otec
ted
Res
ourc
e
Prob
lem
Con
text
:�
Hig
hest
prio
rity,
read
y ta
sks
may
not
run
whe
n ne
eded
, due
to
eve
nts
outs
ide
the
RTO
S s
ched
uler
's c
ontro
l, du
e to
a
low
er p
riorit
y ta
sk ru
nnin
g lo
ckin
g a
shar
ed re
sour
ce�
Prio
rity
Inve
rsio
n�
Crit
ical
dea
dlin
e co
uld
be m
isse
d, c
ausi
ng th
e sy
stem
to fa
ilTw
o So
lutio
ns:
�A
pply
Prio
rity
Inhe
ritan
ce P
atte
rn -
Solv
ed M
AR
S Pa
thfin
der p
riorit
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vers
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prob
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�A
pply
Prio
rity
Cei
ling
Patte
rn (D
escr
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Her
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onse
quen
ces/
Ben
efit:
�E
limin
ate
the
need
for s
emap
hore
s �
Prio
rity
ceilin
g so
lutio
n al
low
s ta
sks
to s
hare
reso
urce
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mpl
yby
cha
ngin
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iorit
ies
Res
ourc
e M
anag
emen
t Top
ic
Prio
rity
Cei
ling
Patte
rn C
lass
Dia
gram
-R
esou
rce
Man
agem
ent C
andi
date
14
Nat
iona
l Aer
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and
Spa
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HA
L D
esig
n Ap
proa
ches
�Th
e H
AL d
esig
n ha
s be
en v
ery
chal
leng
ing,
no
stan
dard
ava
ilabl
e�
Sev
eral
app
roac
hes
have
bee
n in
itiat
ed�
DoD
: M-H
AL
�JT
RS
HA
L st
anda
rd b
ut n
ot a
vaila
ble
�C
P28
9�
Com
pone
nt P
orta
bilit
y S
peci
ficat
ion
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tegr
ated
Circ
uit O
RB
(IC
O)
�FP
GA
mid
dlew
are
tech
nolo
gy
�ST
RS
need
s a
non-
prop
rieta
ry s
tand
ard
HAL
des
ign
�C
andi
date
OO
Des
ign
Pat
tern
s [G
oF]:
�S
trate
gy�
Ada
pter
�B
ridge
�2
leve
ls: P
roxy
at t
he G
PP
, and
Dat
a/C
omm
and
Tran
sfer
for (
SS
P) d
evic
es
Har
dwar
e A
bstra
ctio
n La
yer (
HA
L) T
opic
15
Nat
iona
l Aer
onau
tics
and
Spa
ce A
dmin
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Brid
ge P
atte
rn -
Des
ign
App
lied
for H
AL
STR
S Pr
elim
inar
y H
AL C
lass
Dia
gram
Har
dwar
e A
bstra
ctio
n La
yer (
HA
L) T
opic
16
Nat
iona
l Aer
onau
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and
Spa
ce A
dmin
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Safe
ty a
nd R
elia
bilit
y Te
chni
ques
�Sa
fety
and
Rel
iabi
lity
Rea
l-Tim
e D
esig
n Pa
ttern
s [B
ruce
D
ougl
ass]
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rote
cted
Sin
gle
Cha
nnel
, Hom
ogen
eous
Red
unda
ncy,
Trip
le
Mod
ular
Red
unda
ncy,
Het
erog
eneo
us R
edun
danc
y, M
onito
r-A
ctua
tor,
San
ity C
heck
, Wat
chdo
g, S
afet
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ecut
ive
(AK
A S
afet
y K
erne
l)
Stu
died
in In
itial
Pha
se,
Cla
ss D
iagr
amFo
llow
s
Faul
t Man
agem
ent T
opic
17
Nat
iona
l Aer
onau
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and
Spa
ce A
dmin
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n
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w.n
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gov
Safe
ty E
xecu
tive
Cla
ss D
iagr
am P
atte
rn
Wat
chdo
g
1 *Su
bsys
tem
1 *
FailS
afeC
hann
el
Safe
tyEx
ecut
ive
1*
1*
1
*
1*
1*
1
*E
vent
s m
onito
red
Cha
nnel
s m
onito
red
Prob
lem
Con
text
:�
Pro
vide
saf
ety
in c
ompl
ex m
ulti-
actu
ator
sys
tem
s or
sys
tem
s w
hich
requ
ire
com
plex
faul
t Rec
over
y be
havi
orG
ener
al S
olut
ion:
�U
se a
saf
ety
exec
utiv
e to
ove
rsee
faul
t ide
ntifi
catio
n, is
olat
ion,
and
reco
very
pr
oces
ses.
Con
sequ
ence
s:�
Incr
ease
d co
mpl
exity
. �
Goo
d sc
alab
ility
to c
ompl
ex s
yste
ms
and
com
plex
reco
very
. �
Goo
d co
vera
ge o
f saf
ety
Faul
t Man
agem
ent T
opic
18
Nat
iona
l Aer
onau
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and
Spa
ce A
dmin
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STR
S Fa
ult M
anag
emen
t Seq
uenc
e D
iagr
am
[Rec
over
able
]
alt [R
ecov
erab
le]
alt
:ST
RS
_Co
mm
and
_an
d_C
on
tro
l:S
TRS
_In
fras
truc
ture
Lo
g F
ault
Co
rrec
tive
Act
ion
Tak
en
Lo
g A
ny
Cor
rect
ive
Act
ion
stat
us
Lo
g F
ault
Co
rrec
tive
Act
ion
Tak
en
Lo
g A
ny
Cor
rect
ive
Act
ion
stat
us
Fau
lt D
etec
ted
Fau
lt S
ou
rce
stat
us
Mis
sio
n D
epen
den
t
Fai
l-saf
e m
ode
Fau
lt D
etec
ted
stat
us
Mis
sio
n D
epen
den
t
Fai
l-saf
e m
ode
The
fau
lt s
ou
rce
co
uld
be
an
y p
art
of
the
ST
RS
Rad
io
inc
lud
ing
th
e W
atc
h
Do
g T
ime
r
[FA
TA
L]
[Wat
ch d
og
tim
er e
rro
r]
Faul
t Man
agem
ent T
opic
19
Nat
iona
l Aer
onau
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and
Spa
ce A
dmin
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w.n
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SWaP
Verif
icat
ion
Tech
niqu
es�
Appr
oach
:�
App
ly D
istri
bute
d an
d M
emor
y M
anag
emen
t Pat
tern
s an
d be
nchm
ark
tech
niqu
es (a
pplie
d in
the
final
pha
se)
to te
st a
nd v
erify
NA
SA
STR
S S
WaP
limite
d R
esou
rce
Con
stra
ints
�D
istri
bute
d R
eal-T
ime
Des
ign
Pat
tern
s [B
ruce
D
ougl
ass]
�S
hare
d M
emor
y Pa
ttern
�W
ith o
r With
out I
NTE
GR
ITY
Mem
oryR
egio
nsA
PI
�W
ith IN
TEG
RIT
Y PO
SIX
Shar
ed M
emor
y AP
I�
Rem
ote
Met
hod
Cal
l, O
bser
ver,
Dat
a B
us, P
roxy
, Bro
ker
�M
emor
y M
anag
emen
t Rea
l-Tim
e D
esig
n P
atte
rns
[Bru
ce D
ougl
ass]
�
Mem
ory
Man
agem
ent,
Stat
ic A
lloca
tion,
Poo
l Allo
catio
n,
Fixe
d-S
ized
Buf
fer,
Smar
t Poi
nter
, Gar
bage
Col
lect
ion,
G
arba
ge C
ompa
ctor
�Sh
ared
Lib
rarie
s
Stu
died
in In
itial
Pha
se,
Dia
gram
Fol
low
s
Com
mon
ly U
sed
Tech
niqu
e, D
etai
l Fol
low
s
SWaP
Verif
icat
ion
Topi
c
20
Nat
iona
l Aer
onau
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and
Spa
ce A
dmin
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n
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w.n
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gov
Net
wor
kor
Bus
or D
evic
e
Sha
red
Mem
ory
Pat
tern
INTE
GR
ITY
POSI
X S
hare
d M
emor
y A
PI E
xam
ple
INTE
GR
ITY
POSI
X sh
ared
mem
ory
API
can
be
used
to a
llow
two
sets
of r
eade
rs a
nd w
riter
s to
sha
re m
emor
y us
ing
inde
pend
ent p
ools
.
�Ef
ficie
ntly
man
agin
g m
emor
y is
key
to m
anag
ing
STR
S SW
aP.
Red
unda
nt R
eade
rs
Sha
red
Mem
ory
Rea
ders
thre
ad i
Writ
ers
thre
ad i
Writ
ers
thre
ad 0
Red
unda
nt W
riter
s
Ref
lect
ive
Mem
ory
Are
a
SWaP
Verif
icat
ion
Topi
c
21
Nat
iona
l Aer
onau
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and
Spa
ce A
dmin
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n
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gov
Shar
ed L
ibra
ry
�Sh
ared
libr
arie
s ca
n pr
ovid
e a
larg
e m
emor
y sa
ving
s by
ena
blin
g th
e m
ultip
le v
irtua
l add
ress
spa
ces
in a
sys
tem
to s
hare
the
sam
e co
de.
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ses
a si
ngle
cod
e sp
ace
imag
e w
ith in
depe
nden
t dat
a sp
aces
for
each
pro
cess
/thre
ad
SWaP
Verif
icat
ion
Topi
c
22
Nat
iona
l Aer
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Benc
hmar
k Te
chni
que
Prel
imin
ary
Pla
ns
�B
ench
mar
k Te
chni
que
Def
initi
on
�In
terim
Pha
se W
ork
�B
ench
mar
k Te
stin
g�
Fina
l Pha
se W
ork
�M
ulti
Pur
pose
�P
erfo
rman
ce K
now
ledg
e C
aptu
re�
Mem
ory
Bud
gets
�Ta
sk T
imin
g M
odel
s�
Thro
ughp
ut S
tatis
tics
�Fa
ilure
Tol
eran
ce M
odel
s�
Etc
.�
Driv
es T
est a
nd V
erifi
catio
n Pl
ans
�C
an b
e in
clud
ed in
STR
S P
latfo
rm a
nd R
adio
Pro
vide
r AP
I Gui
danc
eD
ocum
enta
tion
Per
form
ance
Mon
itor a
nd B
ench
mar
k Se
rvic
e To
pic
23
Nat
iona
l Aer
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SWR
adio
PIM
/PSM
�C
ompo
nent
Fra
mew
ork
Faci
litie
s�
Use
d by
maj
ority
of r
adio
com
pone
nts.
Exa
mpl
es:
wav
efor
m, d
evic
e, a
nd p
latfo
rm
man
agem
ent i
nter
face
s.�
Phys
ical
Lay
er F
acili
ties
�B
idire
ctio
nal t
rans
form
atio
n of
dig
itize
d si
gnal
s in
to a
pro
paga
ting
RF
wav
e�
Incl
udes
freq
uenc
y tu
ning
, filt
ers,
inte
rface
can
cella
tion,
ana
log
digi
tal c
onve
rsio
n,
up/d
own
conv
ersi
on, g
ain
cont
rol,
synt
hesi
zer,
base
band
I/O
sup
port
etc.
�R
adio
Set
/Con
trol
Faci
litie
s�
Man
ages
the
radi
o do
mai
n an
d ch
anne
ls w
ithin
the
radi
o.�
Com
mon
Rad
io/P
latfo
rmFa
cilit
ies
�U
sed
by m
ajor
ity o
f rad
io c
ompo
nent
s. E
xam
ples
: lo
ggin
g, n
amin
g, a
nd e
vent
se
rvic
es.
�C
omm
on L
ayer
Fac
ilitie
s�
Use
d by
maj
ority
of r
adio
com
pone
nts.
Exa
mpl
es:
flow
con
trol,
pack
et, a
nd s
tream
in
terfa
ces.
�D
ata
Link
Lay
er F
acili
ties
�C
ompo
sed
of L
ink
Laye
r Con
trol (
LLC
) and
Med
ia A
cces
s C
ontro
l (M
AC
) lay
er
func
tiona
lity
for c
omm
unic
atio
n ne
eds.
�PS
M�
Tran
sfor
mat
ion.
Map
ping
to S
WR
adio
PIM
/PS
M T
opic
24
Nat
iona
l Aer
onau
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n
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Com
mon
Lay
er
Faci
litie
s
QoS
Man
agem
ent
Faci
litie
sFl
ow C
ontro
lFa
cilit
ies
Mea
sure
men
tFa
cilit
ies
QoS
QoS
Con
nect
ion
QoS
Con
nect
ionl
ess
Flow
Con
trol M
gmt.
Flow
Con
trol S
igna
ling
Prio
rity
Flow
Con
trol
Mea
sure
men
t Typ
e
Mea
sure
men
t Pla
n
Mea
sure
men
t Poi
nt
Mea
sure
men
t Pla
n M
anag
er
Mea
sure
men
t Rec
orde
r
Mea
sure
men
t Sto
rage
Rea
l-Tim
e W
avef
orm
Con
trol w
ith S
DR
for S
pace
PIM
/PS
M A
pplie
d
Map
ping
to S
WR
adio
PIM
/PS
M T
opic
25
Nat
iona
l Aer
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and
Spa
ce A
dmin
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n
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Res
ourc
e M
anag
emen
t with
SD
R fo
r Spa
ce P
IM/P
SMAp
plie
d�
Res
ourc
e In
frast
ruct
ure
-Tes
tabl
eObj
ect(
BIT
)�
Obs
erve
r/Pub
lish-
Sub
scrib
e/D
eleg
atio
n E
vent
Des
ign
Pat
tern
[GoF
]�
Obs
erve
r Rea
l-Tim
e D
esig
n D
istri
bute
d P
atte
rn [B
ruce
Dou
glas
s]
Map
ping
to S
WR
adio
PIM
/PS
M T
opic
26
Nat
iona
l Aer
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Initi
al P
hase
Stu
dy R
esul
ts S
DR
for S
pace
PIM
/PSM
�Sp
ecifi
c R
eal-T
ime
Des
ign
Patte
rns
[Bru
ce D
ougl
ass]
and
OO
Des
ign
Patte
rns
[Gan
g-of
-Fou
r (G
oF)]
map
and
cor
resp
ond
to S
DR
for
Spac
e PI
M fo
r med
ium
and
larg
eN
AS
A SD
R m
issi
on c
lass
es.
�PO
SIX
and
RTO
S sp
ecifi
c R
eal-T
ime
tech
niqu
es m
ap a
nd
corr
espo
nd to
NA
SA
SD
R P
SMfo
r med
ium
and
larg
eN
AS
A S
DR
m
issi
on c
lass
es.
�R
TOS
spec
ific
Rea
l-Tim
e te
chni
ques
, tha
t req
uire
min
imum
reso
urce
s,
map
and
cor
resp
ond
to N
ASA
SDR
PSM
for s
mal
lNAS
A SD
R
mis
sion
cla
sses
.�
SDR
for S
pace
PSM
ext
ensi
ons
need
to b
e de
velo
ped
to s
afeg
uard
R
adia
tion
Suita
ble
Pro
cess
ing
requ
irem
ents
.�
Furth
er a
naly
sis
need
ed to
map
the
follo
win
g re
quire
men
ts to
the
SWR
adio
PIM
Com
pone
nt F
ram
ewor
k�
Rel
iabi
lity
(faul
t tol
eran
ce, g
uara
ntee
d de
liver
y) a
nd A
vaila
bilit
y�
Faul
t Man
agem
ent
�S
SP A
bstra
ctio
n�
HA
L
Map
ping
to S
WR
adio
PIM
/PS
M T
opic
27
Nat
iona
l Aer
onau
tics
and
Spa
ce A
dmin
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atio
n
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w.n
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gov
Sum
mar
y an
d C
oncl
usio
n
�ST
RS
mis
sion
sys
tem
s m
ust u
se v
ery
limite
d pr
oces
sor a
nd
mem
ory
reso
urce
s op
timal
ly to
mee
t mis
sion
-crit
ical
and
hig
h re
liabi
lity
requ
irem
ents
.�
Des
ign
patte
rns
will
con
tinue
to b
e le
vera
ged
as a
pplic
able
to
STR
S re
quire
men
ts.
�PI
M/P
SM
ext
ensi
ons
will
con
tinue
to b
e re
fined
in th
e in
terim
and
fin
al p
roto
type
pha
ses.
�Th
e In
terim
pha
se w
ill fo
cus
on in
tegr
atin
g ST
RS
APIs
toge
ther
w
ith O
MG
�sPI
M a
nd P
SM
for S
WR
adio
�Th
e Fi
nal p
hase
will
use
the
inte
grat
ed S
TRS/
SWR
adio
to
impl
emen
t WFs
, int
egra
te W
F de
sign
s w
ith th
e m
atur
ed p
roto
type
, co
nduc
t rev
iew
, and
inco
rpor
ate
into
form
al d
ocum
enta
tion.
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