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It is widely believed that range resolution, the ability to distinguish between two closely situated targets, depends inversely on the bandwidth of the transmitted radar signal. Here we demonstrate a different type of ranging system, which possesses superior range resolution that is almost completely free of bandwidth limitations. By sweeping over the coherence length of the transmitted signal, the partially coherent radar experimentally demonstrates an improvement of over an order of magnitude in resolving targets, compared to standard coherent radars with the same bandwidth. A theoretical framework is developed to show that the resolution could be further improved without a bound, revealing a tradeoff between bandwidth and sweep time. This concept offers solutions to problems which require high range resolution and accuracy but available bandwidth is limited, as is the case for the autonomous car industry, optical imaging, and astronomy to name just few.
This article was published in the following journal.
Name: Nature communications
The partially coherent elegant Laguerre-Gaussian (ELG) beam is of importance and exhibits extraordinary characteristics in many fields, such as optical communications and optical trapping. Here, we sh...
We present a deep learning framework based on a generative adversarial network (GAN) to perform super-resolution in coherent imaging systems. We demonstrate that this framework can enhance the resolut...
Excitation of a multimode fiber with a focused spatially coherent light of finite bandwidth results in a partially coherent light at the output of the fiber. Here we study the properties of speckle an...
A modified lateral shearing interferometry is proposed to measure the spatial coherence of partially coherent light beams. This interferometry based on a 4f system consists of a diffraction grating an...
We report the development of, to the best of our knowledge, a novel supercritical focusing coherent anti-Stokes Raman scattering (SCF-CARS) microscopy for high-resolution vibrational imaging. Two opti...
Background: Contact sensors can cause injuries and infections in newborn infants with fragile skin. The impulse radio ultra-wideband (IR-UWB) radar is recently demonstrated in adults as a ...
Our goal is to design and build a new hearing aid system, which mitigates the most common complaints that hearing aid users have. These include hearing in multi-talker situations, poor so...
The principal objectives of the RADAR trial is to address the hypotheses; 1) that 18 months androgen deprivation in conjunction with radiotherapy is superior to 6 months androgen deprivati...
The objective of this study protocol is to determine the efficacy of using aided measures of spectral resolution to set the dynamic range of hearing with hearing-aid amplification. Measure...
The investigators will assess the effect of different times of radial clamp post procedure on radial artery occlusion and bleeding.
A system using beamed and reflected radio signals to and from an object in such a way that range, bearing, and other characteristics of the object may be determined.
X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range.
Computer disks storing data with a maximum reduction of space and bandwidth. The compact size reduces cost of transmission and storage.
A partially enclosed body of water, and its surrounding coastal habitats, where saltwater from the ocean mixes with fresh water from rivers or streams. The resulting mixture of seawater and fresh water is called brackish water and its salinity can range from 0.5 to 35 ppt. (accessed http://oceanservice.noaa.gov/education/kits/estuaries/estuaries01_whatis.html)
A philosophically coherent set of propositions (for example, utilitarianism) which attempts to provide general norms for the guidance and evaluation of moral conduct. (from Beauchamp and Childress, Principles of Biomedical Ethics, 4th ed)