1. A radar for acquiring a synthetic aperture image of a scene, said scene having one or more radar scatterers located on a horizontal flat {circumflex over (x)},\u0177 plane, said radar system mounted on a moving platform moving at an angle \u03b8tilt with respect to said {circumflex over (x)},\u0177 plane, with a component of motion in a {circumflex over (z)} direction, said {circumflex over (z)} direction perpendicular to said {circumflex over (x)},\u0177 plane, said radar comprising:
a radar receiver for digitizing radar returns having a phase from said scene, and
a computer for adjusting said phase of said radar returns in response to said \u03b8tilt to generate phase adjusted returns and computing said synthetic aperture image from said phase adjusted returns.
2. A radar system as described in claim 1 wherein said phase of said radar returns is adjusted by computing a nominal aircraft track xac,o(s) given by
xac,o(s)=s cos(\u03b8tilt){circumflex over (x)}+yac,o\u0177+zac,o{circumflex over (z)}+s sin (\u03b8tilt){circumflex over (z)};
an aircraft position parameter s given by
s
=
1
cos
\u2062
\u2062
(
\u03b8
tilt
)
\u2061
x
o
+
x
ac
–
x
o
y
ac
–
y
o
\u2062
(
y
ac
,
o
–
y
o
)
;
a Fast Time Scale Factor SFRI given by
SF
RI
=
y
ac
,
o
–
y
o
y
ac
–
y
o
\xb7
\uf603
x
ac
–
x
o
\uf604
\uf603
x
ac
,
o
\u2061
(
s
)
–
x
o
\uf604
;
a Range Offset Rp given by
R
p
=
\uf603
x
ac
–
x
o
\uf604
–
1
SF
RI
\u2061
\uf603
x
ac
,
o
\u2061
(
s
)
–
x
o
\uf604
–
R
s
;
a phase adjustment given by
r
\u2062
\u2062
(
x
ac
,
o
\u2061
(
s
)
,
x
T
)
=
\u2147
\u2148
\u2062
\u2062
(
SF
RI
)
\u2062
\u2062
\u03d5
real
\u2061
(
x
ac
,
x
T
)
\u2062
\u2147
–
\u2148
\u2062
4
\u2062
\u03c0
\u03bb
\u2062
R
p
;
\u2003where
xac,o yac,o and zac,o show an aircraft position,
xo yo and zo show an initial aircraft position in the {circumflex over (x)},\u0177,{circumflex over (z)} direction respectively, and
\u03bb is an operating wavelength of said radar, xT is radar target location and Rs is an initial range.
3. A method for acquiring a synthetic aperture image of a scene using a radar system, said scene having one or more radar scatterers located on a horizontal flat {circumflex over (x)},\u0177 plane, said radar system mounted on a moving platform moving at an angle \u03b8tilt with respect to said {circumflex over (x)},\u0177 plane, with a component of motion in a {circumflex over (z)} direction, said {circumflex over (z)} direction perpendicular to said {circumflex over (x)},\u0177 plane, said method comprising the steps of:
digitizing radar returns having a phase from said scene;
adjusting said phase of said radar returns in response to said \u03b8tilt to generate phase adjusted returns;
computing said synthetic aperture image from said phase adjusted returns.
4. A method as described in claim 3 wherein said phase of said radar returns is adjusted by computing a nominal aircraft track xac,o(s) given by
xac,o(s)=s cos(\u03b8tilt){circumflex over (x)}+yac,o\u0177+zac,o{circumflex over (z)}+s sin (\u03b8tilt){circumflex over (z)};
an aircraft position parameter s given by
s
=
1
cos
\u2062
\u2062
(
\u03b8
tilt
)
\u2061
x
o
+
x
ac
–
x
o
y
ac
–
y
o
\u2062
(
y
ac
,
o
–
y
o
)
;
a Fast Time Scale Factor SFRI given by
SF
RI
=
y
ac
,
o
–
y
o
y
ac
–
y
o
\xb7
\uf603
x
ac
–
x
o
\uf604
\uf603
x
ac
,
o
\u2061
(
s
)
–
x
o
\uf604
;
a Range Offset Rp given by
R
p
=
\uf603
x
ac
–
x
o
\uf604
–
1
SF
RI
\u2061
\uf603
x
ac
,
o
\u2061
(
s
)
–
x
o
\uf604
–
R
s
;
a phase adjustment given by
\u0393(xac,o(s), xT)=ei(SFRI)\u03a6real(xac,xT)e\u2212i4\u03c0\u03bbRp;
\u2003where
xac,o yac,o and zac,o show an aircraft position,
xo yo and zo show an initial aircraft position in the {circumflex over (x)},\u0177,{circumflex over (z)} direction respectively, and
\u03bb is an operating wavelength of said radar, xT is radar target location and Rs is an initial range.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for managing a plurality of different middleware transport modules, the method comprising:
starting a first middleware transport module of the plurality of different middleware transport modules as a root service of the application;
identifying at least one additional middleware transport module of the plurality of different middleware transport modules to be managed contemporaneously with the first middleware transport module;
starting the at least one additional middleware transport module; and
managing the first middleware transport module and the at least one additional middleware transport module by managing only the first middleware transport module within the application.
2. The method according to claim 1, in which the first middleware transport module interfaces to a piece of business logic, the method further comprising:
providing the business logic to the at least one additional middleware transport module.
3. The method according to claim 2, in which the business logic is provided to the at least one additional middleware transport module after starting the at least one additional middleware transport module within the application.
4. The method according to claim 1, in which the plurality of different middleware transport modules comprise a Java Message Service (JMS) application and a Common Object Request Broker Application (CORBA) application.
5. The method according to claim 1, in which managing the first middleware transport module and the at least one additional middleware transport module comprises closing the first middleware transport module and the at least one additional middleware transport module.
6. The method according to claim 5, in which closing the at least one additional middleware transport module comprises calling an equivalent of a closing instruction of the at least one additional middleware transport module based upon closing the first middleware transport module.
7. The method according to claim 5, in which closing the at least one additional middleware transport module comprises deregistering from at least one of a directory service and a name service.
8. The method according to claim 1, in which each of the first middleware transport module and the at least one additional middleware transport module functions according to its corresponding nature after being started.
9. The method according to claim 1, further comprising:
selecting the first middleware transport module as a main thread, the main thread being started as the root service.
10. The method according to claim 9, in which the at least one additional middleware transport module comprises a slave thread.
11. A computer readable medium that stores a program for managing a plurality of different middleware transport modules within an application, the computer readable medium comprising:
a first starting code segment for starting a first middleware transport module of the plurality of different middleware transport modules as a root service;
an identifying code segment for identifying at least one additional middleware transport module of the plurality of different middleware transport modules to be managed contemporaneously with the first middleware transport module;
a second starting code segment for starting the at least one additional middleware transport module; and
a managing code segment for managing the first middleware transport module and the at least one additional middleware transport module by managing only the first middleware transport module.
12. The computer readable medium according to claim 11, further comprising:
a business logic code segment for providing a business logic, with which the first middleware transport module interfaces, to the at least one additional middleware transport module.
13. The computer readable medium according to claim 12, in which the business logic code segment provides the business logic to the at least one additional middleware transport module after starting the at least one additional middleware transport module.
14. The computer readable medium according to claim 11, in which the plurality of different middleware transport modules comprise a Java Message Service (JMS) application and a Common Object Request Broker Application (CORBA) application.
15. The computer readable medium according to claim 11, in which the managing code segment closes the first middleware transport module and the at least one additional middleware transport module.
16. The computer readable medium according to claim 15, in which closing the at least one additional middleware transport module comprises calling an equivalent of a closing instruction of the at least one additional middleware transport module based upon closing the first middleware transport module.
17. The computer readable medium according to claim 15, in which closing the at least one additional middleware transport module comprises deregistering from at least one of a directory service and a name service.
18. The computer readable medium according to claim 11, in which each of the first middleware transport module and the at least one additional middleware transport module functions according to its corresponding nature after being started.
19. A computer readable medium that stores a program for managing a plurality of types of middleware transport modules for accessing business logic, the computer readable medium comprising:
a first starting code segment for starting a first middleware transport module of the plurality of types of middleware transport modules as a main thread;
a second starting code segment for starting a second middleware transport module as a slave thread; and
a managing code segment for managing the main thread and the slave thread, the slave thread being managed in accordance with the managing of the main thread;
wherein a functionality of the slave thread remains independent of a functionality of the main thread.
20. The computer readable medium to claim 19, wherein managing the slave thread comprises shutting down the slave thread in response to shutting down the main thread.