Temporally multiplexed multispectral ladar with Raman-based waveforms

Luke Ausley; Christian Keyser; Richard Martin

doi:10.1117/12.2316351

10 May 2018 Temporally multiplexed multispectral ladar with Raman-based waveforms

Luke Ausley, Christian Keyser, Richard Martin

Proceedings Volume 10636, Laser Radar Technology and Applications XXIII; 106360C (2018) https://doi.org/10.1117/12.2316351
Event: SPIE Defense + Security, 2018, Orlando, FL, United States

Abstract

In order to develop LADAR-based sensors that satisfy the cost, size, weight, and power constraints imposed by increasingly demanding systems, new LADAR architectures need to be developed to support requirements in areas such as intelligence, surveillance, and reconnaissance. Knowledge of the spectral reflectivity of objects in a complex scene may prove useful to distinguish object from background, or even to identify partially occluded objects where a full set of identifying pixels may be impossible to measure. We present a novel LADAR architecture to enable spectral reflectivity measurement with a single pulse of a multispectral laser and a single receiver detector, eliminating spectrally dispersive elements which spatially multiplex the return signal to multiple detectors. This is accomplished by exploiting the wavelength-dependent temporal waveforms that arise from stimulated Raman scattering based multispectral laser sources to multiplex multispectral signals inside a single pulse envelope. With knowledge of these effects in a transmitted laser pulse, a measured pulse envelope at the receiver can be modeled as a sum of reflectivity-scaled spectral components, and the individual object reflectivities estimated. The system performance of this architecture is evaluated using measured pulses of a Raman-based multispectral fiber laser to simulate the measurement of objects of interest, including the influence of detector noise. System performance is quantified by calculating the target reflectivity estimation error as a function of signal-to-noise ratio, receiver bandwidth, and receiver sample rate, demonstrating the feasibility of a temporally multiplexed architecture.

Conference Presentation

Citation Download Citation

Luke Ausley, Christian Keyser, and Richard Martin "Temporally multiplexed multispectral ladar with Raman-based waveforms", Proc. SPIE 10636, Laser Radar Technology and Applications XXIII, 106360C (10 May 2018); https://doi.org/10.1117/12.2316351

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available