Science Daily August 2, 2023
An international team of researchers (Israel, USA – University of Rochester, Canada) studied the fundamental underpinnings of range resolution in coherent remote sensing. They used a novel class of self-referential interference functions to show that they could greatly improve upon currently accepted bounds for range resolution. They considered the range resolution problem from the perspective of single-parameter estimation of amplitude versus the traditional temporally resolved paradigm. They defined the minimum resolvable distance between two depths and the depth resolution between the objects as two figures of merit. They experimentally demonstrated that their system could resolve two depths greater than 100Ă— the inverse bandwidth and measure the distance between two objects to approximately 20ÎĽm (35 000 times smaller than the Rayleigh-resolved limit) for temporally sub resolved objects using frequencies less than 120 MHz radio waves… read more. Open Access TECHNICAL ARTICLE
Free-space (a) and guided-wave (b) and (c) ranging experimental schematics… Credit: Phys. Rev. Lett. 131, 053803, 2 August 2023Â