Mr. Ronald A. Smith Profile

Ronald A. Smith

Senior Technical Rep at US Army Space and Missile Defense Command

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Proceedings Article | 6 August 2002 Paper

Interferometric radar measurements

Ronald Smith, Mark Shipman, E. Holder, James Williams

Proceedings Volume 4718, (2002) https://doi.org/10.1117/12.478825

KEYWORDS: Radar, Interferometry, Missiles, Antennas, Phase measurement, Interferometers, Rockets, Sensors, Defense and security, Control systems

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The United States Army Space and Missile Defense Command (USASMDC) has interest in a technology demonstration that capitalizes on investment in fire control and smart interceptor technologies that have matured beyond basic research. The concept SWORD (Short range missile defense With Optimized Radar Distribution) consists of a novel approach utilizing a missile interceptor and interferometric fire control radar. A hit-to-kill, closed-loop, command guidance scheme is planned that takes advantage of extremely accurate target and interceptor state vectors derived via the fire control radar. The fire control system has the capability to detect, track, and classify multiple threats in a tactical regime as well as simultaneously provide command guidance updates to multiple missile interceptors. The missile interceptor offers a cost reduction potential as well as an enhancement to the kinematics range and lethality over existing SHORAD systems. Additionally, the Radio Frequency (RF) guidance scheme offers increased battlefield weather performance. The Air Defense (AD) community, responding to current threat capabilities and trends, has identified an urgent need to have a capability to counter proliferated, low cost threats with a low cost-per-kill weapon system. The SWORD system will offer a solution that meets this need. The SWORD critical technologies will be identified including a detailed description of each. Validated test results and basic principles of operation will be presented to prove the merit of past investments. The Deputy Assistant Secretary of the Army for Research and Technology (DAS(R&T) has a three- year Science and Technology Program to evaluate the errors and proposed mitigation techniques associated with target spectral dispersion and range gate straddle. Preliminary bench-top experiment results will be presented in this paper.

Proceedings Article | 30 July 2002 Paper

Interferometric acquisition and fire control radar for short-range missile defense with optimized radar distribution (SWORD)

Ronald Smith, Mark Shipman, E. Holder, James Williams

Proceedings Volume 4744, (2002) https://doi.org/10.1117/12.488283

KEYWORDS: Radar, Interferometry, Missiles, Antennas, Phase measurement, Interferometers, Defense and security, Rockets, Sensors, Control systems

Read Abstract +

The United States Army Space and Missile Defense Command (USASMDC) has interest in a technology demonstration that capitalizes on investment in fire control and smart interceptor technologies that have matured beyond basic research. The concept "SWORD" (Short range missile defense With Optimized Radar Distribution) consists of a novel approach utilizing a missile interceptor and interferometric fire control radar. A hit-to-kill, closed-loop, command guidance scheme is planned that takes advantage of extremely accurate target and interceptor state vectors derived via the fire control radar. The fire control system has the capability to detect, track, and classify multiple threats in a tactical regime as well as simultaneously provide command guidance updates to multiple missile interceptors. The missile interceptor offers a cost reduction potential as well as an enhancement to the kinematics range and lethality over existing SHORAD systems. Additionally, the Radio Frequency (RF) guidance scheme offers increased battlefield weather performance. The Air Defense (AD) community, responding to current threat capabilities and trends, has identified an urgent need to have a capability to counter proliferated, low cost threats with a low cost-per-kill weapon system. The SWORD system will offer a solution that meets this need. The SWORD critical technologies will be identified including a detailed description of each. Validated test results and basic principles of operation will be presented to prove the merit of the past investments. The Deptuy Assistant Secretary of the Army for Research and Technology [DAS(R&T)] has a three-year Science and Technology Program to evaluate the errors and proposed mitigation techniques associated with target spectral dispersion and range gate straddle. Preliminary Bench-Top Experiment results will be presented in this paper.

Proceedings Article | 30 July 2002 Paper

Measurements of atmospheric turbulence with an x-band radar: correlation with angle-of-arrival results

E. Holder, James Kerce, Ronald Smith, Mark Shipman, Robert McMillan, James Williams

Proceedings Volume 4744, (2002) https://doi.org/10.1117/12.488282

KEYWORDS: Radar, X band, Humidity, Geometrical optics, Atmospheric turbulence, Refraction, Interferometry, Microwave radiation, Antennas, Transmitters

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We report on measurements of the index of refraction structure parameter C_n² using an X-band interferometric radar operating over a 3.5 km path in Southern California. These measurements were made by observing signal fluctuations and relating them to the structure parameter. Simultaneous measurements of temperature, atmospheric pressure, and humidity were made at the end points of the range. Values of C_n² ranging from 1.4 x 10^-15 to 6.3 x 10^-15 m^-2/3 were observed over a propagation path that was up to 275 m above ground level. These values are generally much larger than those that would be observed at visible wavelengths under the same conditions because of the contributions of the humidity structure parameter and the cross correlation of the temperature and humidity structure parameters. We also address correlation of these measurements of C_n² with fluctuations in the radar angle-of-arrival.

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