Sandia’s laser-guided bullet prototype can hit small targets a mile away

Feb. 2, 2012
Albuquerque, NM--Sandia National Laboratories researchers Red Jones, Brian Kast, and their colleagues have invented a finned self-guided bullet for small-caliber, smooth-bore firearms that accurately hits laser-designated targets at distances of more than a mile.

Albuquerque, NM--Sandia National Laboratories researchers Red Jones, Brian Kast, and their colleagues have invented a finned self-guided bullet for small-caliber, smooth-bore firearms that could accurately hit laser-designated targets at distances of more than a mile.

The design for the four-inch-long bullet includes an optical sensor in the nose to detect a laser-beam spot on a target. The sensor sends information to guidance and control electronics that use an algorithm in an 8-bit CPU to command electromagnetic actuators. These actuators steer small fins that guide the bullet to the target with a flight-path-correction rate of 30 times a second.

No rifling

Most bullets are shot from rifles that have grooves, or rifling, that cause them to spin so they fly straight, like a long football pass. To enable a bullet to turn in flight toward a target and to simplify the design, the spin had to go, said Jones. The bullet flies straight due to its aerodynamically stable design, which consists of a center of gravity that sits forward in the projectile and tiny fins that enable it to fly without spin, just as a dart does, he said.

A nighttime field test in which a small LED was attached to the bullet showed the battery and electronics can survive flight, Jones said. Researchers also filmed high-speed video of the bullet radically pitching as it exited the barrel. The bullet pitches less as it flies down range, a phenomenon known to long-range firearms experts as “going to sleep.” Because the bullet’s motions settle the longer it is in flight, accuracy improves at longer ranges, Jones noted.

45X accuracy improvement at 1000 m

Computer aerodynamic modeling shows the design would result in dramatic improvements in accuracy, according to Jones. Simulations showed an unguided bullet under real-world conditions could miss a target more than a half mile away (1,000 m away) by 9.8 yards (9 m), but a guided bullet would get within 8 in. (0.2 m), according to the patent.

Plastic "sabots" provide a gas seal in the cartridge and protect the delicate fins until the sabots drop off after the bullet emerges from the firearm’s barrel. The bullet can reach speeds of 2,400 feet per second, or Mach 2.1, using commercially available gunpowder. The researchers are confident it could reach standard military speeds using customized gunpowder.

“We have a very promising technology to guide small projectiles that could be fully developed inexpensively and rapidly,” Jones said. Sandia is seeking a private company partner to complete testing of the prototype and bring a guided bullet to the marketplace.

Source: https://share.sandia.gov/news/resources/news_releases/bullet/

About the Author

John Wallace | Senior Technical Editor (1998-2022)

John Wallace was with Laser Focus World for nearly 25 years, retiring in late June 2022. He obtained a bachelor's degree in mechanical engineering and physics at Rutgers University and a master's in optical engineering at the University of Rochester. Before becoming an editor, John worked as an engineer at RCA, Exxon, Eastman Kodak, and GCA Corporation.

Sponsored Recommendations

Download New Product Development Strategies White Paper

March 27, 2025
Discover the importance of new product innovation, different process methods, and best practices for optimizing your company’s strengths.

Manufacturing Considerations for Tolerancing Aspheres

March 13, 2025
Understand the critical factors in manufacturing aspheres and how Lacroix Optics ensures precise tolerancing in every optical component.

Explore Our Videos: Insights into Precision Optics

March 13, 2025
Get an inside look at Lacroix Optics with our collection of informative videos showcasing our capabilities, innovations, and processes.

Optical Assemblies: Reliable and Precise Solutions

March 13, 2025
Ensure your optical system works seamlessly with Lacroix Optics' custom optical assemblies. Discover the precision and reliability we bring to every project.

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!