[Doc Ewen looks into the horn antenna, 1950]
Image courtesy of Doc Ewen


Harvard Cyclotron: 1948-1951

Detection of HI Line: 1951

Harvard 24ft and 60ft and NRAO founding: 1952-1956

1950s and 1960s: Two Roads that Crossed

Microwave & Millimeter Wave Applications in the 1970s and 1980s

Mm Wave Radiometry in the 1990s

May 2001 visit to NRAO Green Bank



[Doc Ewen and horn antenna, 2001]
Image courtesy of Doc Ewen

Doc Ewen: The Horn, HI, and Other Events in US Radio Astronomy

by Doc Ewen, © 2003

Slide presentation: Millimeter-Wave Radiometry in the 1990s

Section 1: MAPS Facility, 1995

Millimeter Wave Analysis of Passive Signatures The STAG program was initiated at Eglin Air Force Base in 1990 under the sponsorship of the Armament Directorate of Wright Laboratory. The purpose of the STAG program was to investigate and support passive millimeter wave activities associated with the development of smart tactical autonomous guidance systems. Development of the associated sensor technology focused attention on a data collection/phenomenology effort to provide a firm foundation for sensor design and algorithm development.

The centerpiece of the data collection/phenomenology effort was the mobile test bed referred to as MAPS, an acronym taken from Millimeter Wave Analysis of Passive Signatures. MAPS provided the data base of passive millimeter wave information concerning terrain, atmospheric, and target signatures needed to support the critical development technologies associated with the STAG program. MAPS' low-bed trailer included an equipment enclosure which was 8 feet wide and 25 feet long.

Photographs of MAPS are shown in the following slides; click on the thumbnails for larger images and explanatory text.

Slide 1: MAPS trailer in the Millitech test area.
Slide 2: MAPS interior showing controls.
Slide 3: Land mine images passively generated by MAPS at 95 GHz.
Slide 4: MAPS close-up of land mine field.
Slide 5: MAPS passive mm-wave 95 GHz images compared to video images.
Slide 6: MAPS rocket stand measurement configuration at Stennis AFB.
Slide 7: Plume signatures obtained at Stennis AFB.
Slide 8: MAPS images of cloud-related sky noise.
Slide 9: Final set of MAPS images, spring 2003.
Slide 10: Close-up of 60 GHz MAPS image.
Slide 11: MAPS at Westover AFB.
Slide 12: MAPS and RAVIN at Westover in 2003.
Slide 13: Reconfigured RAVIN-SL5 at Westover in fall 2003.
View RAVIN slides

Modified on Tuesday, 14-Jun-2005 08:50:50 EDT by Ellen Bouton