The Intelligent Missile Seeker (IMS)
The IMS program intended to demonstrate the use of spectral
imaging in a missile seeker. The objective was to combine
spatial and spectral analyses techniques for target/decoy
discrimination. As a part of the program a dual VNIR/SWIR
imaging spectrometer was built. Spectral signatures of various
airborne targets and various IR decoys and countermeasures (CM) were
analyzed in order to assess the potential discrimination in real
time operation. Target signatures were both measured and
obtained via simulation.
The sensors comprised of:
 | Pushbroom system
| OPTICS: Common 6" Cassagrain telescope, with a dichroic
beam splitter sending SWIR radiation to one system and
reflecting VNIR to the other.
| VNIR system
 | Sensor: 256×256 pixels CCD FPA
| Dispersion element: gratings
| Spectral range & resolution: 500 to 1,000 nm at 5 nm resolution (oversampled spectrum)
| Internal optics: three apochromatic (400 to 1,000 nm)
compound lens systems for (i) focusing light to an entrance
slit, (ii) collimating onto the gratings, and (iii) refocusing
onto the CCD
| | | |
| SWIR system
| Sensor: 160×120 pixels InSb FPA cooled to
LN2 temperature
| Dispersion element: gratings
| Spectral range & resolution: 2.5 to 5.0 µm at ~0.05 µm
| Internal optics: three set of custom compound Ge/Si lens
system as above.
| | | |
| Data acquisition: interface to a PC via a frame grabber
| | | | |
[Click on image with right button and select "view image" for
enlarged format]
Sensor System. Field Experiment
In the field experiment, the IMS sensor has collected spectra
of various commercial airplanes during takeoff and landing, in a
non imaging mode (stationary, with no push broom operations).
The IMS sensor was delivered to the Air Force, Wright
Laboratories, Armament Development Directorate in 1994
For more information, please browse the "Hyperspectrum Newsletter"
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