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Proceedings Paper

Line imaging ladar using a laser-diode transmitter and FM/cw radar principles for submunition applications
Author(s): Barry L. Stann; Ahmed Abou-Auf; William C. Ruff; Dale Robinson; Brian Liss; William Potter; Scott D. Sarama; Mark M. Giza; Deborah R. Simon; Scott Frankel; Zoltan G. Sztankay
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Paper Abstract

We describe the technical approach, component development, and test results of a line imager laser radar (ladar) being developed at the Army Research Laboratory (ARL) for smart munition applications. We obtain range information using a frequency modulation/continuous wave (FM/cw) technique implemented by directly amplitude modulating a near-IR diode laser transmitter with a radio frequency (rf) subcarrier that is linearly frequency modulated. The diode's output is collimated and projected to form a line illumination in the downrange image area. The returned signal is focused onto a line array of metal-semiconductor-metal (MSM) detectors where it is detected and mixed with a delayed replica of the laser modulation signal that modulates the responsivity of each detector. The output of each detector is an intermediate frequency (IF) signal (a product of the mixing process) whose frequency is proportional to the target range. This IF signal is continuously sampled over each period of the rf modulation. Following this, a N-channel signal processor based on field- programmable gate arrays (FPGA) calculates the discrete Fourier transform over the IF waveform in each pixel to establish the ranges to all the scatterers and their respective amplitudes. Over the past year, we constructed the fundamental building blocks of this ladar, which include a 3.5-W line illuminator, a wideband linear FM chirp modulator, a N-pixel MSM detector line array, and a N-channel FPGA signal processor. In this paper we report on the development and performance of each building block and the results of system tests conducted in the laboratory.

Paper Details

Date Published: 5 September 2000
PDF: 12 pages
Proc. SPIE 4035, Laser Radar Technology and Applications V, (5 September 2000); doi: 10.1117/12.397792
Show Author Affiliations
Barry L. Stann, Army Research Lab. (United States)
Ahmed Abou-Auf, Army Research Lab. (United States)
William C. Ruff, Army Research Lab. (United States)
Dale Robinson, Army Research Lab. (United States)
Brian Liss, Army Research Lab. (United States)
William Potter, Army Research Lab. (United States)
Scott D. Sarama, Army Research Lab. (United States)
Mark M. Giza, Army Research Lab. (United States)
Deborah R. Simon, Army Research Lab. (United States)
Scott Frankel, Army Research Lab. (United States)
Zoltan G. Sztankay, Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 4035:
Laser Radar Technology and Applications V
Gary W. Kamerman; Upendra N. Singh; Christian Werner; Vasyl V. Molebny, Editor(s)

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