An All-Optical 3D Matched Filter For Moving Target Detection

R. Gagliardi; I. Reed

doi:10.1117/12.951717

2 June 1989 An All-Optical 3D Matched Filter For Moving Target Detection

R. Gagliardi, I. Reed

Proceedings Volume 1059, Space Sensing, Communications, and Networking; (1989) https://doi.org/10.1117/12.951717
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

The use of 3D (three dimensional) matched filtering has been shown to be a powerful procedure for detecting weak targets of a known velocity imbedded in a strong background. The concept is based on electronic digital signal processing following imaging of the target scene on a CCD array. The array produces a sequence of data frames and the 3D algorithms produce filtered images in which the targets emerge as observable tracks. These algorithms have been implemented and verified via both simulation and real data processing. The system is constrained however in that full benefit of the processing requires a 2D transform to be executed each frame time, and therefore is the ultimate limit in scene size and processing speed. Recent study at USC has been devoted to investigating the feasibility of an all-optical system to perform the equivalent 3D processing. The required scene transforms are obtained optically, and the 3D algorithm implemented via optical beam combining, storage, and read-out. This paper presents the results of the current study, indicating suggested implementations of the optics and their required hardware development. Devices needed to succcessfully implement the algorithms are discussed, and basic shortfalls and anomalies are considered. Key elements appear to be the spatial light modulators and stobed read-outs of holograms or storage plates.

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R. Gagliardi and I. Reed "An All-Optical 3D Matched Filter For Moving Target Detection", Proc. SPIE 1059, Space Sensing, Communications, and Networking, (2 June 1989); https://doi.org/10.1117/12.951717

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KEYWORDS

Clocks

Detection and tracking algorithms

Target detection

3D acquisition

Modulation

Spatial light modulators

Filtering (signal processing)

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