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]
System Field
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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