Synthetic Aperture Imaging With A Pulsed Co2 Tea Laser

C . C. Aleksoff; J. S. Accetta; L. M. Peterson; A. M. Tai; A. Klooster; K. S. Schroeder; R. M. Majewski; J. O. Abshier; M. Fee

doi:10.1117/12.940575

24 September 1987 Synthetic Aperture Imaging With A Pulsed Co₂ Tea Laser

C . C. Aleksoff, J. S. Accetta, L. M. Peterson, A. M. Tai, A. Klooster, K. S. Schroeder, R. M. Majewski, J. O. Abshier, M. Fee

Author Affiliations +

Proceedings Volume 0783, Laser Radar II; (1987) https://doi.org/10.1117/12.940575
Event: 1987 Technical Symposium Southeast on Optics, Electro-Optics, and Sensors, 1987, Orlando, FL, United States

Abstract

A new indoor SAL (synthetic aperture LADAR) test range is described that uses a pulsed CO2 TEA laser as the transmitter source. This monostatic range can be used to produce high-resolution 3-D synthetic aperture (range-Doppler) images of targets. The SAL is a homodyne based receiver system that uses a long path reference signal with a frequency offset generated via an acousto-optic cell. The TEA laser is a multicavity system that is stepped through a series of single frequencies to obtain the ranging information. The transmission frequencies are monitored and controlled by heterodyning part of the trans-mission signal against a stable low-pressure CW CO₂ laser. Azimuth (Doppler) information is generated by stepping through a series of angles on a gimbaled transmit/receive mirror. The target and SAL are mounted on different vibration isolated tables. Motion monitoring interferometers between the tables furnish motion compensation data for the image processing stage while range variations are automatically corrected during data gathering. The TEA laser is run at up to 100 pulses per second. Both the received pulse and the trans-mitted pulse are recorded by a high speed wavefrom digitizer system. This data, along with motion compensation and reference data, is used to produce imagery via Fourier transform based processing.

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C . C. Aleksoff, J. S. Accetta, L. M. Peterson, A. M. Tai, A. Klooster, K. S. Schroeder, R. M. Majewski, J. O. Abshier, and M. Fee "Synthetic Aperture Imaging With A Pulsed Co₂ Tea Laser", Proc. SPIE 0783, Laser Radar II, (24 September 1987); https://doi.org/10.1117/12.940575

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