Digital Holography (DH) is a coherent imaging technology for tactical applications. Because DH is a phase sensitive imaging technology it has multifunction capability. Some of these functions include, 2D, 3D and vibration imaging. Direct access to image phase enables digital image aberration correction. In this presentation we present an overview of DH technology and provide theory and example imagery for aberration corrected 2D, 3D, and vibration imaging.
The Super-resolution Sensor System (S3) program is an ambitious effort to exploit the maximum information a laser-based
sensor can obtain. At Lockheed Martin Coherent Technologies (LMCT), we are developing methods of
incorporating multi-function operation (3D imaging, vibrometry, polarimetry, aperture synthesis, etc.) into a single
device. The waveforms are matched to the requirements of both hardware (e.g., optical amplifiers, modulators) and the
targets being imaged. The first successful demonstrations of this program have produced high-resolution, three-dimensional
images at intermediate stand-off ranges. In addition, heavy camouflage penetration has been successfully
demonstrated. The resolution of a ladar sensor scales with the bandwidth as dR = c/(2B), with a corresponding scaling of
the range precision. Therefore, the ability to achieve large bandwidths is crucial to developing a high-resolution sensor.
While there are many methods of achieving the benefit of large bandwidths while using lower bandwidth electronics
(e.g., an FMCW implementation), the S3 system produces and detects the full waveform bandwidth, enabling a large set
of adaptive waveforms for applications requiring large range search intervals (RSI) and short duration waveforms. This
paper highlights the combined three-dimensional imaging and vibrometry demos.
The Super-resolution Sensor System (S3) program is an ambitious effort to exploit the maximum information a laser-based sensor can obtain. At Lockheed Martin Coherent Technologies (LMCT), we are developing methods of incorporating multi-function operation (3D imaging, vibrometry, polarimetry, aperture synthesis, etc.) into a single device. The waveforms will be matched to the requirements of both hardware (e.g., optical amplifiers, modulators) and the targets being imaged. The first successful demonstrations of this program have produced high-resolution, three-dimensional images at intermediate stand-off ranges. In addition, heavy camouflage penetration has been successfully demonstrated. The resolution of a ladar sensor scales with the bandwidth as dR = c/(2B), with a corresponding scaling of the range precision. Therefore, the ability to achieve large bandwidths is crucial to developing a high-resolution sensor. While there are many methods of achieving the benefit of large bandwidths while using lower bandwidth electronics (e.g., an FMCW implementation), the S3 system produces and detects the full waveform bandwidth, enabling a large set of adaptive waveforms for applications requiring large range search intervals (RSI) and short duration waveforms. This paper highlights the three-dimensional imaging and camo penetration.
High range-resolution active imaging requires high-bandwidth transmitters and receivers. At Lockheed Martin Coherent
Technologies (LMCT), we are developing both linear Frequency Modulated Continuous Wave (FMCW) and short pulse
laser radar sensors to supply the needed bandwidth. FMCW waveforms are advantageous in many applications, since
target returns can be optically demodulated, mitigating the need for high-speed detectors and receiver electronics,
enabling the use of much lower bandwidth cameras. However, some of the penalties paid for these transceivers include
a finite range search interval (RSI) and the requirement for slow chirp or long-duration waveforms, owing to the
relatively slow sample frequency of the cameras used in the receiver. For applications requiring larger RSI's and short
duration waveforms, LMCT is also developing high bandwidth pulsed ladar waveforms and receivers. This paper will
include discussion of these two methods, their tradeoffs and sample imagery collected at LMCT.
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