Featured Research

from universities, journals, and other organizations

Researchers Patent Digital Process For Aircraft Radar Warning Receivers

Date:
March 21, 2007
Source:
Georgia Institute of Technology Research News
Summary:
Researchers at the Georgia Tech Research Institute have patented a discovery that could significantly increase reliability and reduce cost in equipment that helps protect US military aircraft from attack.

Georgia Tech Research Institute researcher Mike Willis displays the newly patented digital crystal video receiver. By converting U.S. radar warning receivers from analog to digital circuits, the digital crystal video receiver will provide more stable in-air detection of enemy ground radar at less cost.
Credit: Georgia Tech Photo by Gary Meek

Researchers at the Georgia Tech Research Institute (GTRI) have patented a discovery that could significantly increase reliability and reduce cost in equipment that helps protect U.S. military aircraft from attack.

The patent covers a device called a digital crystal video receiver (DCVR), a vital part of the radar warning receiver (RWR) system that alerts an aircraft crew to enemy ground-radar activity. GTRI researchers Michael J. Willis and Michael L. McGuire, working with Air Force scientist Charlie W. Clark, have patented a way to use digital circuitry to perform many functions formerly allotted to more-problematic analog chips.

Specifically, the researchers have moved a critical operation -- the logarithmic transfer function -- from the analog to the digital domain. The logarithmic transfer function coordinates the input and output of a radar warning receiver's signal-processing system.

"Electronic analog technologies have a number of error sources and limitations when subjected to the extended temperature range that our military requires," said Willis, a principal research engineer with GTRI's Electronic Systems Laboratory (ELSYS). "By moving the logarithmic transfer function into the digital signal-processing domain, we've improved the stability of the circuit."

Analog circuits, traditionally used to detect real-world phenomena such as sound or temperature, hold a multitude of continuous values across any given range. By contrast, digital circuits process information in discrete steps governed by the binary code that computers use.

In radar warning receivers, Willis explains, the continuous-scale analog implementation has been difficult to calibrate and maintain. By contrast, the digital domain needs no calibration and is more robust.

The digital version is also far less expensive to manufacture.

"Moving the logarithmic transfer function from analog to digital probably reduces production costs of a radar warning receiver by a factor of between five and 10," he said. "The cost of the digital video portion could become nearly insignificant in comparison to the cost of the remainder of the RWR system."

The new digital crystal video receiver is comprised of an analog-to-digital converter and a programmable logic component. Together, they're able to transfer most received analog signals to the more-reliable digital domain.

Earlier crystal video receiver architectures, Willis explains, detected radio-frequency (RF) signals immediately, without intermediate processing. Such analog "direct-conversion" receivers often needed multiple receivers to detect radar signals over a range of frequencies.

By contrast, the DCVR's improvements include a capacity to readily detect RF signals through a wide range of frequencies using up-to-date broadband receiver techniques.

Scientists use the word "video" to describe this technology because the receiver demodulates received radar signals into video waveforms. The new digital crystal video receiver approach subjects those video waveforms to digital signal processing, producing a digital equivalent with a logarithmic function applied to it to make processing easier.

"Adding the word 'digital' to the older term 'crystal video receiver' emphasizes that technology advances have allowed us to overcome many limitations of the older-generation, crystal-based, direct-conversion receivers," Willis said.

The initial sponsored research involved a radar warning receiver used on a number of U.S. military aircraft, Willis said. The discovery may have other military applications as well.

Commercial applications are also possible, he said. The discovery could be applied not only to radar warning receivers but to any receiver that requires a logarithmic transfer function. Thus, it could be used in many types of radios or in other devices that involve signal receiving and processing capabilities.

The recent patent, shared by GTRI and the U.S. government, is significant because it protects the technology. Still, Willis said, the patent is only another step in an ongoing process leading to field deployment.

Currently, he said, GTRI is studying how to implement the new technology. He expects it will take two years to complete the design process and transition the final implementation into production.


Story Source:

The above story is based on materials provided by Georgia Institute of Technology Research News. Note: Materials may be edited for content and length.


Cite This Page:

Georgia Institute of Technology Research News. "Researchers Patent Digital Process For Aircraft Radar Warning Receivers." ScienceDaily. ScienceDaily, 21 March 2007. <www.sciencedaily.com/releases/2007/03/070319175821.htm>.
Georgia Institute of Technology Research News. (2007, March 21). Researchers Patent Digital Process For Aircraft Radar Warning Receivers. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2007/03/070319175821.htm
Georgia Institute of Technology Research News. "Researchers Patent Digital Process For Aircraft Radar Warning Receivers." ScienceDaily. www.sciencedaily.com/releases/2007/03/070319175821.htm (accessed October 21, 2014).

Share This



More Matter & Energy News

Tuesday, October 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Graphene Paint Offers Rust-Free Future

Graphene Paint Offers Rust-Free Future

Reuters - Innovations Video Online (Oct. 21, 2014) British scientists have developed a prototype graphene paint that can make coatings which are resistant to liquids, gases, and chemicals. The team says the paint could have a variety of uses, from stopping ships rusting to keeping food fresher for longer. Jim Drury reports. Video provided by Reuters
Powered by NewsLook.com
Gulfstream G500, G600 Unveiling

Gulfstream G500, G600 Unveiling

Flying (Oct. 20, 2014) Watch Gulfstream's public launch of the G500 and G600 at their headquarters in Savannah, Ga., along with a surprise unveiling of the G500, which taxied up under its own power. Video provided by Flying
Powered by NewsLook.com
Japanese Scientists Unveil Floating 3D Projection

Japanese Scientists Unveil Floating 3D Projection

Reuters - Innovations Video Online (Oct. 20, 2014) Scientists in Tokyo have demonstrated what they say is the world's first 3D projection that floats in mid air. A laser that fires a pulse up to a thousand times a second superheats molecules in the air, creating a spark which can be guided to certain points in the air to shape what the human eye perceives as an image. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-Fuel Impala

Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-Fuel Impala

3BL Media (Oct. 20, 2014) Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-fuel Impala Video provided by 3BL
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins