Partially Coherent Radar Unties Range Resolution from Bandwidth Limitations

TL;DR

This paper introduces a partially coherent radar system that achieves high range resolution independent of bandwidth limitations, offering significant improvements over traditional coherent radars.

Contribution

It presents a novel radar approach that unbinds range resolution from bandwidth constraints and provides a theoretical framework for further enhancement.

Findings

Achieved over an order of magnitude improvement in target resolution

Demonstrated experimental viability of partially coherent radar

Developed a theoretical model showing unbounded resolution potential

Abstract

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.