Multi-function coherent ladar 3D imaging with S3
2007
The Super-resolution Sensor System (S 3 ) 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 S 3 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.
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