SPIE-ChirpedAM07f.doc - Chirped amplitude modulation ladar...

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Chirped amplitude modulation ladar for range and Doppler measurements and 3-D imaging Barry Stann * , Brian C. Redman, William Lawler, Mark Giza, John Dammann Army Research Laboratory (ARL), 2800 Powder Mill Road, Adelphi, MD 20783 Keith Krapels Office of Naval Research, 875 N. Randolph St., Ste. 1425, Arlington, VA 22203-1995 ABSTRACT Shipboard infrared search and track (IRST) systems can detect sea-skimming anti-ship missiles at long ranges, but cannot distinguish missiles from slowly moving false targets and clutter. In a joint Army-Navy program, the Army Research Laboratory (ARL) is developing a ladar to provide unambiguous range and velocity measurements of targets detected by the distributed aperture system (DAS) IRST system being developed by the Naval Research Laboratory (NRL) sponsored by the Office of Naval Research (ONR). By using the ladar's range and velocity data, false alarms and clutter objects will be distinguished from incoming missiles. Because the ladar uses an array receiver, it can also provide three-dimensional (3-D) imagery of potential threats at closer ranges in support of the force protection/situational awareness mission. The ladar development is being accomplished in two phases. In Phase I, ARL designed, built, and reported on an initial breadboard ladar for proof-of-principle static platform field tests. In Phase II, ARL was tasked to design, and test an advanced breadboard ladar that corrected various shortcomings in the transmitter optics and receiver electronics and improved the signal processing and display code. The advanced breadboard will include a high power laser source utilizing a long pulse erbium amplifier built under contract. Because award of the contract for the erbium amplifier was delayed, final assembly of the advanced ladar is delayed. In the course of this year’s work we built a “research receiver” to facilitate design revisions, and when combined with a low-power laser, enabled us to demonstrate the viability of the components and subsystems comprising the advanced ladar. Key Words : Ladar, Lidar, fm-cw, chirped AM, range-Doppler, tracking, 3D imaging, cruise missile, force protection, IRST 1.0 INTRODUCTION Shipboard infrared search and track (IRST) systems are capable of detecting sea-skimming anti-ship missiles at long ranges. Since IRST systems cannot measure range and line-of-sight (LOS) velocity, they have difficulty distinguishing missiles from slowly moving false targets and clutter. Radars can provide range and velocity measurements to distinguish high-speed targets from slowly moving false targets and clutter. Radars, however, have difficulty operating in the marine boundary layer against near surface targets due to scattering from the sea surface and ducting in the marine boundary layer. In addition, ships desire to minimize the use of their radars to reduce their chances of being detected by enemy combatants. The Office of Naval Research (ONR) has requested that the Army Research Laboratory
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  • Spring '12
  • Islam
  • Ladar, EBAPS, chirp generator, breadboard ladar, advanced breadboard ladar

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